Sf Integration

# Claude Code lifecycle hooks for sf-integration
# These hooks are registered by the installer (tools/install.py)
# and are NOT part of the Agent Skills open specification.

PreToolUse:
- matcher: Bash
  hooks:
  - type: command
    command: "python3 ${SHARED_HOOKS}/scripts/guardrails.py"
    timeout: 5000
PostToolUse:
- matcher: Write
  hooks:
  - type: command
    command: "python3 ${SKILL_HOOKS}/suggest_credential_setup.py"
    timeout: 5000
  - type: command
    command: "python3 ${SKILL_HOOKS}/validate_integration.py"
    timeout: 10000
- matcher: Edit
  hooks:
  - type: command
    command: "python3 ${SKILL_HOOKS}/suggest_credential_setup.py"
    timeout: 5000

/**
 * @description Retry Handler with Exponential Backoff for HTTP Callouts
 *
 * Use Case: Handle transient failures with intelligent retry
 * - Network timeouts
 * - 5xx server errors
 * - Rate limiting (429)
 *
 * Features:
 * - Exponential backoff between retries
 * - Configurable retry count
 * - Jitter to prevent thundering herd
 * - Distinguishes retryable vs non-retryable errors
 *
 * IMPORTANT: Apex doesn't have Thread.sleep(), so retry with backoff
 *            is implemented via Queueable job scheduling for async contexts.
 *            For sync contexts, this provides immediate retry without delay.
 *
 * @author {{Author}}
 * @date {{Date}}
 */
public with sharing class CalloutRetryHandler {

    // Configuration
    private static final Integer MAX_RETRIES = 3;
    private static final Integer BASE_DELAY_MS = 1000; // 1 second
    private static final Integer MAX_DELAY_MS = 30000; // 30 seconds

    // Retryable status codes
    private static final Set<Integer> RETRYABLE_STATUS_CODES = new Set<Integer>{
        408, // Request Timeout
        429, // Too Many Requests (Rate Limited)
        500, // Internal Server Error
        502, // Bad Gateway
        503, // Service Unavailable
        504  // Gateway Timeout
    };

    /**
     * @description Execute HTTP request with retry logic (immediate retries)
     * @param request HttpRequest to execute
     * @return HttpResponse from successful call
     * @throws CalloutException if all retries exhausted
     */
    public static HttpResponse executeWithRetry(HttpRequest request) {
        return executeWithRetry(request, MAX_RETRIES);
    }

    /**
     * @description Execute HTTP request with configurable retry count
     * @param request HttpRequest to execute
     * @param maxRetries Maximum retry attempts
     * @return HttpResponse from successful call
     * @throws CalloutException if all retries exhausted
     */
    public static HttpResponse executeWithRetry(HttpRequest request, Integer maxRetries) {
        Integer retryCount = 0;
        HttpResponse response;
        Exception lastException;

        while (retryCount <= maxRetries) {
            try {
                Http http = new Http();
                response = http.send(request);

                Integer statusCode = response.getStatusCode();

                // Success - return immediately
                if (statusCode >= 200 && statusCode < 300) {
                    return response;
                }

                // Client error (4xx except 408, 429) - don't retry
                if (statusCode >= 400 && statusCode < 500 &&
                    !RETRYABLE_STATUS_CODES.contains(statusCode)) {
                    throw new NonRetryableException(
                        'Client Error (' + statusCode + '): ' + response.getBody()
                    );
                }

                // Retryable error - check if we should retry
                if (RETRYABLE_STATUS_CODES.contains(statusCode)) {
                    retryCount++;
                    if (retryCount > maxRetries) {
                        throw new RetryExhaustedException(
                            'Max retries exhausted. Last status: ' + statusCode +
                            ', Body: ' + response.getBody()
                        );
                    }

                    // Log retry attempt
                    System.debug(LoggingLevel.WARN,
                        'Retryable error (' + statusCode + '). Attempt ' + retryCount +
                        ' of ' + maxRetries);

                    // For 429, check Retry-After header
                    if (statusCode == 429) {
                        String retryAfter = response.getHeader('Retry-After');
                        if (String.isNotBlank(retryAfter)) {
                            System.debug(LoggingLevel.WARN, 'Rate limited. Retry-After: ' + retryAfter);
                        }
                    }

                    // Continue to next retry (no delay in sync Apex)
                    continue;
                }

                // Other status codes - don't retry
                return response;

            } catch (CalloutException e) {
                // Network/connection error
                lastException = e;
                retryCount++;

                if (retryCount > maxRetries) {
                    throw new RetryExhaustedException(
                        'Max retries exhausted after CalloutException: ' + e.getMessage()
                    );
                }

                System.debug(LoggingLevel.WARN,
                    'CalloutException on attempt ' + retryCount + ': ' + e.getMessage());
            }
        }

        // Should not reach here, but handle edge case
        throw new RetryExhaustedException('Unexpected retry loop exit');
    }

    /**
     * @description Calculate delay with exponential backoff and jitter
     *              (Useful for scheduled retry jobs)
     * @param retryAttempt Current retry attempt (1-based)
     * @return Delay in milliseconds
     */
    public static Integer calculateBackoffDelay(Integer retryAttempt) {
        // Exponential backoff: baseDelay * 2^(attempt-1)
        Integer exponentialDelay = BASE_DELAY_MS * (Integer) Math.pow(2, retryAttempt - 1);

        // Add jitter (random 0-25% of delay)
        Double jitter = Math.random() * 0.25 * exponentialDelay;
        Integer delayWithJitter = exponentialDelay + (Integer) jitter;

        // Cap at max delay
        return Math.min(delayWithJitter, MAX_DELAY_MS);
    }

    /**
     * @description Check if HTTP status code is retryable
     * @param statusCode HTTP status code
     * @return True if request should be retried
     */
    public static Boolean isRetryable(Integer statusCode) {
        return RETRYABLE_STATUS_CODES.contains(statusCode);
    }

    /**
     * @description Exception for non-retryable errors (4xx client errors)
     */
    public class NonRetryableException extends Exception {}

    /**
     * @description Exception when all retry attempts exhausted
     */
    public class RetryExhaustedException extends Exception {}
}

/**
 * @description HTTP Response Handler Utility
 *
 * Use Case: Standardized response parsing and error handling
 * - Parse JSON responses to typed objects
 * - Handle different content types
 * - Extract error messages from various API formats
 * - Logging for debugging
 *
 * @author {{Author}}
 * @date {{Date}}
 */
public with sharing class HttpResponseHandler {

    /**
     * @description Parse HTTP response to Map
     * @param response HttpResponse to parse
     * @return Parsed response as Map<String, Object>
     * @throws HttpResponseException for error status codes
     */
    public static Map<String, Object> parseJsonResponse(HttpResponse response) {
        validateSuccessResponse(response);

        String body = response.getBody();
        if (String.isBlank(body) || response.getStatusCode() == 204) {
            return new Map<String, Object>();
        }

        try {
            return (Map<String, Object>) JSON.deserializeUntyped(body);
        } catch (JSONException e) {
            throw new HttpResponseException(
                'Failed to parse JSON response: ' + e.getMessage() +
                '. Body: ' + body.left(500)
            );
        }
    }

    /**
     * @description Parse HTTP response to List
     * @param response HttpResponse to parse
     * @return Parsed response as List<Object>
     * @throws HttpResponseException for error status codes
     */
    public static List<Object> parseJsonArrayResponse(HttpResponse response) {
        validateSuccessResponse(response);

        String body = response.getBody();
        if (String.isBlank(body)) {
            return new List<Object>();
        }

        try {
            return (List<Object>) JSON.deserializeUntyped(body);
        } catch (JSONException e) {
            throw new HttpResponseException(
                'Failed to parse JSON array response: ' + e.getMessage()
            );
        }
    }

    /**
     * @description Parse HTTP response to specific type
     * @param response HttpResponse to parse
     * @param targetType Apex type to deserialize to
     * @return Deserialized object
     * @throws HttpResponseException for error status codes
     */
    public static Object parseTypedResponse(HttpResponse response, Type targetType) {
        validateSuccessResponse(response);

        String body = response.getBody();
        if (String.isBlank(body)) {
            return null;
        }

        try {
            return JSON.deserialize(body, targetType);
        } catch (JSONException e) {
            throw new HttpResponseException(
                'Failed to deserialize response to ' + targetType.getName() + ': ' + e.getMessage()
            );
        }
    }

    /**
     * @description Validate response is successful (2xx)
     * @param response HttpResponse to validate
     * @throws HttpResponseException for non-2xx status codes
     */
    public static void validateSuccessResponse(HttpResponse response) {
        Integer statusCode = response.getStatusCode();

        // Log response for debugging
        logResponse(response);

        if (statusCode >= 200 && statusCode < 300) {
            return; // Success
        }

        String errorMessage = extractErrorMessage(response);

        if (statusCode >= 400 && statusCode < 500) {
            throw new ClientErrorException(
                'HTTP ' + statusCode + ': ' + errorMessage
            );
        }

        if (statusCode >= 500) {
            throw new ServerErrorException(
                'HTTP ' + statusCode + ': ' + errorMessage
            );
        }

        throw new HttpResponseException(
            'Unexpected HTTP status ' + statusCode + ': ' + errorMessage
        );
    }

    /**
     * @description Extract error message from response body
     * @param response HttpResponse containing error
     * @return Error message string
     */
    public static String extractErrorMessage(HttpResponse response) {
        String body = response.getBody();

        if (String.isBlank(body)) {
            return 'No response body';
        }

        // Try to parse as JSON error
        try {
            Map<String, Object> errorObj = (Map<String, Object>) JSON.deserializeUntyped(body);

            // Common error formats
            // Format 1: { "error": "message" }
            if (errorObj.containsKey('error')) {
                Object error = errorObj.get('error');
                if (error instanceof String) {
                    return (String) error;
                }
                if (error instanceof Map<String, Object>) {
                    Map<String, Object> errorMap = (Map<String, Object>) error;
                    if (errorMap.containsKey('message')) {
                        return (String) errorMap.get('message');
                    }
                }
            }

            // Format 2: { "message": "error message" }
            if (errorObj.containsKey('message')) {
                return (String) errorObj.get('message');
            }

            // Format 3: { "errors": [{ "message": "..." }] }
            if (errorObj.containsKey('errors')) {
                Object errors = errorObj.get('errors');
                if (errors instanceof List<Object>) {
                    List<Object> errorList = (List<Object>) errors;
                    if (!errorList.isEmpty()) {
                        Object firstError = errorList[0];
                        if (firstError instanceof Map<String, Object>) {
                            Map<String, Object> errMap = (Map<String, Object>) firstError;
                            if (errMap.containsKey('message')) {
                                return (String) errMap.get('message');
                            }
                        }
                        if (firstError instanceof String) {
                            return (String) firstError;
                        }
                    }
                }
            }

            // Format 4: { "detail": "error detail" }
            if (errorObj.containsKey('detail')) {
                return (String) errorObj.get('detail');
            }

            // Fallback: return serialized error object
            return JSON.serialize(errorObj);

        } catch (Exception e) {
            // Not JSON - return raw body (truncated)
            return body.left(1000);
        }
    }

    /**
     * @description Log HTTP response for debugging
     * @param response HttpResponse to log
     */
    private static void logResponse(HttpResponse response) {
        System.debug(LoggingLevel.DEBUG, '=== HTTP Response ===');
        System.debug(LoggingLevel.DEBUG, 'Status: ' + response.getStatusCode() + ' ' + response.getStatus());

        // Log important headers
        String[] headerKeys = new String[]{ 'Content-Type', 'X-Request-Id', 'Retry-After', 'X-RateLimit-Remaining' };
        for (String key : headerKeys) {
            String value = response.getHeader(key);
            if (String.isNotBlank(value)) {
                System.debug(LoggingLevel.DEBUG, key + ': ' + value);
            }
        }

        // Log body (truncated for large responses)
        String body = response.getBody();
        if (String.isNotBlank(body)) {
            System.debug(LoggingLevel.DEBUG, 'Body: ' + body.left(5000));
        }
    }

    /**
     * @description Get response header value
     * @param response HttpResponse
     * @param headerName Header name to retrieve
     * @return Header value or null
     */
    public static String getHeader(HttpResponse response, String headerName) {
        return response.getHeader(headerName);
    }

    /**
     * @description Check if response indicates success
     * @param response HttpResponse to check
     * @return True if status code is 2xx
     */
    public static Boolean isSuccess(HttpResponse response) {
        Integer statusCode = response.getStatusCode();
        return statusCode >= 200 && statusCode < 300;
    }

    /**
     * @description Check if response indicates rate limiting
     * @param response HttpResponse to check
     * @return True if status code is 429
     */
    public static Boolean isRateLimited(HttpResponse response) {
        return response.getStatusCode() == 429;
    }

    /**
     * @description Base exception for HTTP response errors
     */
    public virtual class HttpResponseException extends Exception {}

    /**
     * @description Exception for 4xx client errors
     */
    public class ClientErrorException extends HttpResponseException {}

    /**
     * @description Exception for 5xx server errors
     */
    public class ServerErrorException extends HttpResponseException {}
}

/**
 * @description Asynchronous REST Callout using Queueable
 *
 * Use Case: Callouts triggered from DML operations
 * - Trigger-based integrations
 * - Process Builder / Flow callouts
 * - Any callout after DML (insert, update, delete)
 *
 * CRITICAL: Synchronous callouts are NOT allowed after DML.
 *           Always use Queueable with Database.AllowsCallouts for such scenarios.
 *
 * Features:
 * - Implements Database.AllowsCallouts for HTTP requests
 * - Processes records in batches
 * - Includes error handling and logging
 * - Supports job chaining for pagination
 *
 * @author {{Author}}
 * @date {{Date}}
 */
public with sharing class {{ServiceName}}QueueableCallout implements Queueable, Database.AllowsCallouts {

    private static final String NAMED_CREDENTIAL = 'callout:{{NamedCredentialName}}';
    private static final Integer DEFAULT_TIMEOUT = 120000;
    private static final Integer BATCH_SIZE = 10; // Callouts per job (max 100 per transaction)

    private List<Id> recordIds;
    private String operation;
    private Integer startIndex;

    /**
     * @description Constructor for processing records
     * @param recordIds List of record IDs to process
     * @param operation Operation type (CREATE, UPDATE, DELETE, SYNC)
     */
    public {{ServiceName}}QueueableCallout(List<Id> recordIds, String operation) {
        this(recordIds, operation, 0);
    }

    /**
     * @description Constructor with pagination support
     * @param recordIds List of record IDs to process
     * @param operation Operation type
     * @param startIndex Starting index for batch processing
     */
    public {{ServiceName}}QueueableCallout(List<Id> recordIds, String operation, Integer startIndex) {
        this.recordIds = recordIds;
        this.operation = operation;
        this.startIndex = startIndex;
    }

    /**
     * @description Execute the queueable job
     * @param context QueueableContext
     */
    public void execute(QueueableContext context) {
        if (recordIds == null || recordIds.isEmpty()) {
            return;
        }

        // Calculate batch bounds
        Integer endIndex = Math.min(startIndex + BATCH_SIZE, recordIds.size());
        List<Id> batchIds = new List<Id>();
        for (Integer i = startIndex; i < endIndex; i++) {
            batchIds.add(recordIds[i]);
        }

        try {
            // Query records for this batch
            List<{{ObjectName}}> records = [
                SELECT Id, Name{{AdditionalFields}}
                FROM {{ObjectName}}
                WHERE Id IN :batchIds
                WITH USER_MODE
            ];

            // Process each record
            List<{{ObjectName}}> toUpdate = new List<{{ObjectName}}>();
            for ({{ObjectName}} record : records) {
                try {
                    processRecord(record, operation);
                    // Mark success on record if needed
                    record.Integration_Status__c = 'Success';
                    record.Integration_Date__c = Datetime.now();
                    toUpdate.add(record);
                } catch (Exception e) {
                    // Log individual record failure
                    System.debug(LoggingLevel.ERROR,
                        'Failed to process record ' + record.Id + ': ' + e.getMessage());
                    record.Integration_Status__c = 'Error';
                    record.Integration_Error__c = e.getMessage().left(255);
                    toUpdate.add(record);
                }
            }

            // Update records with sync status
            if (!toUpdate.isEmpty()) {
                update toUpdate;
            }

            // Chain next batch if more records remain
            if (endIndex < recordIds.size()) {
                System.enqueueJob(
                    new {{ServiceName}}QueueableCallout(recordIds, operation, endIndex)
                );
            }

        } catch (Exception e) {
            System.debug(LoggingLevel.ERROR, '{{ServiceName}}QueueableCallout Error: ' + e.getMessage());
            System.debug(LoggingLevel.ERROR, 'Stack Trace: ' + e.getStackTraceString());
            // Consider: Create Integration_Log__c record, send notification, etc.
        }
    }

    /**
     * @description Process a single record with external API
     * @param record The record to process
     * @param operation The operation type
     */
    private void processRecord({{ObjectName}} record, String operation) {
        switch on operation {
            when 'CREATE' {
                createExternalRecord(record);
            }
            when 'UPDATE' {
                updateExternalRecord(record);
            }
            when 'DELETE' {
                deleteExternalRecord(record.Id);
            }
            when 'SYNC' {
                syncExternalRecord(record);
            }
            when else {
                throw new IntegrationException('Unknown operation: ' + operation);
            }
        }
    }

    /**
     * @description Create record in external system
     * @param record Salesforce record
     */
    private void createExternalRecord({{ObjectName}} record) {
        Map<String, Object> payload = buildPayload(record);

        HttpRequest req = new HttpRequest();
        req.setEndpoint(NAMED_CREDENTIAL + '/{{Endpoint}}');
        req.setMethod('POST');
        req.setHeader('Content-Type', 'application/json');
        req.setTimeout(DEFAULT_TIMEOUT);
        req.setBody(JSON.serialize(payload));

        HttpResponse res = new Http().send(req);
        handleResponse(res, record.Id);
    }

    /**
     * @description Update record in external system
     * @param record Salesforce record
     */
    private void updateExternalRecord({{ObjectName}} record) {
        if (String.isBlank(record.External_Id__c)) {
            throw new IntegrationException('No external ID for record: ' + record.Id);
        }

        Map<String, Object> payload = buildPayload(record);

        HttpRequest req = new HttpRequest();
        req.setEndpoint(NAMED_CREDENTIAL + '/{{Endpoint}}/' + record.External_Id__c);
        req.setMethod('PUT');
        req.setHeader('Content-Type', 'application/json');
        req.setTimeout(DEFAULT_TIMEOUT);
        req.setBody(JSON.serialize(payload));

        HttpResponse res = new Http().send(req);
        handleResponse(res, record.Id);
    }

    /**
     * @description Delete record from external system
     * @param recordId Salesforce record ID
     */
    private void deleteExternalRecord(Id recordId) {
        // Query for external ID
        {{ObjectName}} record = [
            SELECT External_Id__c
            FROM {{ObjectName}}
            WHERE Id = :recordId
            WITH USER_MODE
            LIMIT 1
        ];

        if (String.isBlank(record.External_Id__c)) {
            return; // Nothing to delete externally
        }

        HttpRequest req = new HttpRequest();
        req.setEndpoint(NAMED_CREDENTIAL + '/{{Endpoint}}/' + record.External_Id__c);
        req.setMethod('DELETE');
        req.setTimeout(DEFAULT_TIMEOUT);

        HttpResponse res = new Http().send(req);
        handleResponse(res, recordId);
    }

    /**
     * @description Sync record with external system (get latest and update)
     * @param record Salesforce record
     */
    private void syncExternalRecord({{ObjectName}} record) {
        if (String.isBlank(record.External_Id__c)) {
            createExternalRecord(record);
        } else {
            updateExternalRecord(record);
        }
    }

    /**
     * @description Build API payload from Salesforce record
     * @param record Salesforce record
     * @return Payload map for API
     */
    private Map<String, Object> buildPayload({{ObjectName}} record) {
        return new Map<String, Object>{
            'salesforceId' => record.Id,
            'name' => record.Name
            // Add more field mappings as needed
        };
    }

    /**
     * @description Handle HTTP response
     * @param res HTTP response
     * @param recordId Salesforce record ID (for logging)
     */
    private void handleResponse(HttpResponse res, Id recordId) {
        Integer statusCode = res.getStatusCode();

        if (statusCode >= 200 && statusCode < 300) {
            System.debug(LoggingLevel.DEBUG, 'Success for ' + recordId + ': ' + res.getBody());
            return;
        }

        if (statusCode >= 400 && statusCode < 500) {
            throw new IntegrationException(
                'Client Error (' + statusCode + ') for ' + recordId + ': ' + res.getBody()
            );
        }

        if (statusCode >= 500) {
            throw new IntegrationException(
                'Server Error (' + statusCode + ') for ' + recordId + ': ' + res.getBody()
            );
        }
    }

    /**
     * @description Custom exception for integration errors
     */
    public class IntegrationException extends Exception {}
}

/**
 * @description Synchronous REST Callout Service for {{ServiceName}}
 *
 * Use Case: Real-time API calls where immediate response is needed
 * - User-initiated actions requiring feedback
 * - API calls NOT triggered from DML operations
 *
 * IMPORTANT: Do NOT use synchronous callouts from triggers or DML contexts.
 *            Use rest-queueable-callout.cls template instead.
 *
 * @author {{Author}}
 * @date {{Date}}
 */
public with sharing class {{ServiceName}}Callout {

    // Named Credential reference (configured in Setup)
    private static final String NAMED_CREDENTIAL = 'callout:{{NamedCredentialName}}';

    // Default timeout (max 120000 ms = 120 seconds)
    private static final Integer DEFAULT_TIMEOUT = 120000;

    /**
     * @description Make HTTP request to external API
     * @param method HTTP method (GET, POST, PUT, PATCH, DELETE)
     * @param endpoint API endpoint path (appended to Named Credential base URL)
     * @param body Request body (null for GET/DELETE)
     * @return HttpResponse from external API
     */
    public static HttpResponse makeRequest(String method, String endpoint, String body) {
        HttpRequest req = new HttpRequest();
        req.setEndpoint(NAMED_CREDENTIAL + endpoint);
        req.setMethod(method);
        req.setHeader('Content-Type', 'application/json');
        req.setHeader('Accept', 'application/json');
        req.setTimeout(DEFAULT_TIMEOUT);

        if (String.isNotBlank(body) && (method == 'POST' || method == 'PUT' || method == 'PATCH')) {
            req.setBody(body);
        }

        Http http = new Http();
        return http.send(req);
    }

    /**
     * @description GET request
     * @param endpoint API endpoint path
     * @return Parsed response as Map
     */
    public static Map<String, Object> get(String endpoint) {
        HttpResponse res = makeRequest('GET', endpoint, null);
        return handleResponse(res);
    }

    /**
     * @description GET request with query parameters
     * @param endpoint API endpoint path
     * @param params Query parameters
     * @return Parsed response as Map
     */
    public static Map<String, Object> get(String endpoint, Map<String, String> params) {
        String queryString = buildQueryString(params);
        String fullEndpoint = String.isNotBlank(queryString)
            ? endpoint + '?' + queryString
            : endpoint;
        return get(fullEndpoint);
    }

    /**
     * @description POST request
     * @param endpoint API endpoint path
     * @param payload Request body as Map
     * @return Parsed response as Map
     */
    public static Map<String, Object> post(String endpoint, Map<String, Object> payload) {
        HttpResponse res = makeRequest('POST', endpoint, JSON.serialize(payload));
        return handleResponse(res);
    }

    /**
     * @description PUT request (full resource update)
     * @param endpoint API endpoint path
     * @param payload Request body as Map
     * @return Parsed response as Map
     */
    public static Map<String, Object> put(String endpoint, Map<String, Object> payload) {
        HttpResponse res = makeRequest('PUT', endpoint, JSON.serialize(payload));
        return handleResponse(res);
    }

    /**
     * @description PATCH request (partial resource update)
     * @param endpoint API endpoint path
     * @param payload Request body as Map
     * @return Parsed response as Map
     */
    public static Map<String, Object> patch(String endpoint, Map<String, Object> payload) {
        HttpResponse res = makeRequest('PATCH', endpoint, JSON.serialize(payload));
        return handleResponse(res);
    }

    /**
     * @description DELETE request
     * @param endpoint API endpoint path
     * @return Parsed response as Map (may be empty for 204)
     */
    public static Map<String, Object> del(String endpoint) {
        HttpResponse res = makeRequest('DELETE', endpoint, null);
        return handleResponse(res);
    }

    /**
     * @description Handle HTTP response and parse JSON
     * @param res HttpResponse from callout
     * @return Parsed response as Map
     * @throws CalloutException for error status codes
     */
    private static Map<String, Object> handleResponse(HttpResponse res) {
        Integer statusCode = res.getStatusCode();
        String responseBody = res.getBody();

        // Log for debugging (consider removing in production or use custom logging)
        System.debug(LoggingLevel.DEBUG, 'Response Status: ' + statusCode);
        System.debug(LoggingLevel.DEBUG, 'Response Body: ' + responseBody);

        // Success (2xx)
        if (statusCode >= 200 && statusCode < 300) {
            if (String.isBlank(responseBody) || statusCode == 204) {
                return new Map<String, Object>();
            }
            return (Map<String, Object>) JSON.deserializeUntyped(responseBody);
        }

        // Client Error (4xx)
        if (statusCode >= 400 && statusCode < 500) {
            String errorMessage = parseErrorMessage(responseBody);
            throw new ClientException('Client Error (' + statusCode + '): ' + errorMessage);
        }

        // Server Error (5xx)
        if (statusCode >= 500) {
            throw new ServerException('Server Error (' + statusCode + '): ' + responseBody);
        }

        // Unexpected status
        throw new CalloutException('Unexpected status code: ' + statusCode);
    }

    /**
     * @description Parse error message from response body
     * @param responseBody Raw response body
     * @return Error message string
     */
    private static String parseErrorMessage(String responseBody) {
        try {
            Map<String, Object> errorResponse = (Map<String, Object>) JSON.deserializeUntyped(responseBody);

            // Common error message field names
            if (errorResponse.containsKey('error')) {
                Object error = errorResponse.get('error');
                if (error instanceof String) {
                    return (String) error;
                } else if (error instanceof Map<String, Object>) {
                    Map<String, Object> errorObj = (Map<String, Object>) error;
                    return (String) errorObj.get('message');
                }
            }
            if (errorResponse.containsKey('message')) {
                return (String) errorResponse.get('message');
            }
            if (errorResponse.containsKey('errors')) {
                return JSON.serialize(errorResponse.get('errors'));
            }

            return responseBody;
        } catch (Exception e) {
            return responseBody;
        }
    }

    /**
     * @description Build URL query string from parameters
     * @param params Map of query parameters
     * @return Encoded query string
     */
    private static String buildQueryString(Map<String, String> params) {
        if (params == null || params.isEmpty()) {
            return '';
        }

        List<String> pairs = new List<String>();
        for (String key : params.keySet()) {
            String value = params.get(key);
            if (String.isNotBlank(value)) {
                pairs.add(EncodingUtil.urlEncode(key, 'UTF-8') + '=' +
                          EncodingUtil.urlEncode(value, 'UTF-8'));
            }
        }
        return String.join(pairs, '&');
    }

    /**
     * @description Client error (4xx) exception
     */
    public class ClientException extends Exception {}

    /**
     * @description Server error (5xx) exception
     */
    public class ServerException extends Exception {}
}

/**
 * @description Change Data Capture (CDC) Handler for {{ObjectName}}
 *
 * Use Case: Business logic for processing CDC events
 * - Sync changes to external systems
 * - Maintain audit logs
 * - Trigger downstream processes
 *
 * This class is called by the {{ObjectName}}CDCSubscriber trigger
 * and contains all business logic for CDC event processing.
 *
 * @author {{Author}}
 * @date {{Date}}
 */
public with sharing class {{ObjectName}}CDCHandler {

    // Fields to watch for sync (ignore changes to other fields)
    private static final Set<String> SYNC_FIELDS = new Set<String>{
        'Name',
        'Status__c',
        'Amount__c'
        // Add fields that should trigger sync
    };

    /**
     * @description Handle CREATE change events
     * @param event The CDC event
     * @param header The change event header
     */
    public static void handleCreate({{ObjectName}}ChangeEvent event, EventBus.ChangeEventHeader header) {
        List<String> recordIds = header.getRecordIds();
        Datetime commitTime = header.getCommitTimestamp();

        System.debug(LoggingLevel.DEBUG,
            'CDC CREATE - Records: ' + recordIds + ' at ' + commitTime);

        // Build payload from event field values
        Map<String, Object> payload = buildPayloadFromEvent(event);
        payload.put('recordIds', recordIds);
        payload.put('operation', 'CREATE');
        payload.put('timestamp', commitTime);

        // Queue sync to external system
        System.enqueueJob(new ExternalSyncQueueable(payload));
    }

    /**
     * @description Handle UPDATE change events
     * @param event The CDC event
     * @param header The change event header
     * @param changedFields List of changed field API names
     */
    public static void handleUpdate(
        {{ObjectName}}ChangeEvent event,
        EventBus.ChangeEventHeader header,
        List<String> changedFields
    ) {
        List<String> recordIds = header.getRecordIds();

        // Check if any sync-relevant fields changed
        Boolean relevantChange = false;
        List<String> relevantFields = new List<String>();

        for (String field : changedFields) {
            if (SYNC_FIELDS.contains(field)) {
                relevantChange = true;
                relevantFields.add(field);
            }
        }

        if (!relevantChange) {
            System.debug(LoggingLevel.DEBUG,
                'CDC UPDATE - Ignoring (no sync fields changed): ' + changedFields);
            return;
        }

        System.debug(LoggingLevel.DEBUG,
            'CDC UPDATE - Records: ' + recordIds +
            ', Relevant changed fields: ' + relevantFields);

        // Build payload with changed values
        Map<String, Object> payload = buildPayloadFromEvent(event);
        payload.put('recordIds', recordIds);
        payload.put('operation', 'UPDATE');
        payload.put('changedFields', relevantFields);
        payload.put('timestamp', header.getCommitTimestamp());

        // Queue sync to external system
        System.enqueueJob(new ExternalSyncQueueable(payload));
    }

    /**
     * @description Handle DELETE change events
     * @param recordIds Deleted record IDs
     * @param header The change event header
     */
    public static void handleDelete(List<String> recordIds, EventBus.ChangeEventHeader header) {
        System.debug(LoggingLevel.DEBUG,
            'CDC DELETE - Records: ' + recordIds);

        Map<String, Object> payload = new Map<String, Object>{
            'recordIds' => recordIds,
            'operation' => 'DELETE',
            'timestamp' => header.getCommitTimestamp()
        };

        // Queue delete sync to external system
        System.enqueueJob(new ExternalSyncQueueable(payload));
    }

    /**
     * @description Handle UNDELETE change events
     * @param event The CDC event
     * @param header The change event header
     */
    public static void handleUndelete({{ObjectName}}ChangeEvent event, EventBus.ChangeEventHeader header) {
        // Treat undelete like create - sync full record
        handleCreate(event, header);
    }

    /**
     * @description Handle GAP events (missed events)
     * @param recordIds Affected record IDs
     * @param gapType Type of gap event
     */
    public static void handleGap(List<String> recordIds, String gapType) {
        System.debug(LoggingLevel.WARN,
            'CDC GAP - Type: ' + gapType + ', Records: ' + recordIds);

        // Query current state of records and sync
        // This ensures we have accurate data despite missed events
        /*
        List<{{ObjectName}}> records = [
            SELECT Id, Name, Status__c, Amount__c
            FROM {{ObjectName}}
            WHERE Id IN :recordIds
            WITH USER_MODE
        ];

        for ({{ObjectName}} record : records) {
            Map<String, Object> payload = new Map<String, Object>{
                'recordIds' => new List<String>{record.Id},
                'operation' => 'SYNC', // Full sync due to gap
                'data' => record
            };
            System.enqueueJob(new ExternalSyncQueueable(payload));
        }
        */
    }

    /**
     * @description Handle GAP_OVERFLOW (too many changes)
     * @param entityName The object API name
     */
    public static void handleOverflow(String entityName) {
        System.debug(LoggingLevel.ERROR,
            'CDC OVERFLOW for ' + entityName + ' - Full sync required!');

        // Create alert/task for admin attention
        /*
        Task alertTask = new Task(
            Subject = 'CDC Overflow - Full Sync Required for ' + entityName,
            Description = 'Change Data Capture experienced overflow. ' +
                         'Some events were missed. Full sync is required.',
            Priority = 'High',
            Status = 'Open',
            ActivityDate = Date.today()
        );
        insert alertTask;
        */

        // Consider triggering a batch job for full sync
        // Database.executeBatch(new FullSyncBatch(entityName));
    }

    /**
     * @description Build payload map from CDC event field values
     * @param event The CDC event
     * @return Map of field values
     */
    private static Map<String, Object> buildPayloadFromEvent({{ObjectName}}ChangeEvent event) {
        Map<String, Object> payload = new Map<String, Object>();

        // Map event fields to payload
        // Only non-null values are changed fields
        payload.put('Name', event.Name);
        // payload.put('Status__c', event.Status__c);
        // payload.put('Amount__c', event.Amount__c);
        // Add more fields as needed

        // Remove null values (unchanged fields)
        Set<String> keysToRemove = new Set<String>();
        for (String key : payload.keySet()) {
            if (payload.get(key) == null) {
                keysToRemove.add(key);
            }
        }
        for (String key : keysToRemove) {
            payload.remove(key);
        }

        return payload;
    }

    /**
     * @description Queueable job for syncing to external system
     */
    public class ExternalSyncQueueable implements Queueable, Database.AllowsCallouts {
        private Map<String, Object> payload;

        public ExternalSyncQueueable(Map<String, Object> payload) {
            this.payload = payload;
        }

        public void execute(QueueableContext context) {
            try {
                // Call external system with payload
                // Example: Use Named Credential + REST callout
                /*
                HttpRequest req = new HttpRequest();
                req.setEndpoint('callout:ExternalSystem/sync');
                req.setMethod('POST');
                req.setHeader('Content-Type', 'application/json');
                req.setBody(JSON.serialize(payload));

                Http http = new Http();
                HttpResponse res = http.send(req);

                if (res.getStatusCode() >= 200 && res.getStatusCode() < 300) {
                    System.debug('Sync successful');
                } else {
                    System.debug('Sync failed: ' + res.getStatusCode());
                }
                */

                System.debug(LoggingLevel.DEBUG,
                    'External sync payload: ' + JSON.serialize(payload));

            } catch (Exception e) {
                System.debug(LoggingLevel.ERROR,
                    'External sync failed: ' + e.getMessage());
                // Consider: Create error log, retry logic, DLQ
            }
        }
    }
}

/**
 * @description Change Data Capture (CDC) Subscriber Trigger for {{ObjectName}}
 *
 * Use Case: React to data changes in near real-time
 * - Sync data to external systems
 * - Audit logging
 * - Cache invalidation
 * - Event-driven integrations
 *
 * CDC Channel Name: {{ObjectName}}ChangeEvent
 * - Standard objects: AccountChangeEvent, ContactChangeEvent, etc.
 * - Custom objects: MyObject__ChangeEvent (append "ChangeEvent" to API name)
 *
 * Key Concepts:
 * - ChangeEventHeader contains metadata (changeType, changedFields, recordIds)
 * - Event contains changed field values (nulls for unchanged fields)
 * - Supports CREATE, UPDATE, DELETE, UNDELETE change types
 * - Gap events indicate missed events (handle replay)
 *
 * IMPORTANT:
 * - Enable CDC for object in Setup → Integrations → Change Data Capture
 * - Triggers fire in separate transaction from DML
 * - Events are retained for 3 days (replay window)
 *
 * @author {{Author}}
 * @date {{Date}}
 */
trigger {{ObjectName}}CDCSubscriber on {{ObjectName}}ChangeEvent (after insert) {

    // Track replay ID for checkpoint
    String lastReplayId = '';

    for ({{ObjectName}}ChangeEvent event : Trigger.new) {
        // Store replay ID
        lastReplayId = event.ReplayId;

        // Get change event header (metadata about the change)
        EventBus.ChangeEventHeader header = event.ChangeEventHeader;

        // Extract header information
        String changeType = header.getChangeType();
        List<String> changedFields = header.getChangedFields();
        List<String> recordIds = header.getRecordIds();
        String entityName = header.getEntityName();
        Long commitNumber = header.getCommitNumber();
        Datetime commitTimestamp = header.getCommitTimestamp();
        String transactionKey = header.getTransactionKey();

        // Log event details
        System.debug(LoggingLevel.DEBUG,
            'CDC Event - Type: ' + changeType +
            ', Entity: ' + entityName +
            ', Records: ' + recordIds +
            ', Changed Fields: ' + changedFields);

        try {
            // Route based on change type
            switch on changeType {
                when 'CREATE' {
                    {{ObjectName}}CDCHandler.handleCreate(event, header);
                }
                when 'UPDATE' {
                    {{ObjectName}}CDCHandler.handleUpdate(event, header, changedFields);
                }
                when 'DELETE' {
                    {{ObjectName}}CDCHandler.handleDelete(recordIds, header);
                }
                when 'UNDELETE' {
                    {{ObjectName}}CDCHandler.handleUndelete(event, header);
                }
                when 'GAP_CREATE', 'GAP_UPDATE', 'GAP_DELETE', 'GAP_UNDELETE' {
                    // Gap events indicate missed events
                    // Should trigger full sync for affected records
                    System.debug(LoggingLevel.WARN,
                        'GAP event detected - some events may have been missed. ' +
                        'Type: ' + changeType + ', Records: ' + recordIds);
                    {{ObjectName}}CDCHandler.handleGap(recordIds, changeType);
                }
                when 'GAP_OVERFLOW' {
                    // Too many changes to track - full sync needed
                    System.debug(LoggingLevel.ERROR,
                        'GAP_OVERFLOW - full sync required for ' + entityName);
                    {{ObjectName}}CDCHandler.handleOverflow(entityName);
                }
            }

        } catch (Exception e) {
            // Log error but continue processing
            System.debug(LoggingLevel.ERROR,
                'CDC processing error for ' + recordIds + ': ' + e.getMessage());
            System.debug(LoggingLevel.ERROR, 'Stack: ' + e.getStackTraceString());
        }
    }

    // Set resume checkpoint for durability
    if (String.isNotBlank(lastReplayId)) {
        EventBus.TriggerContext.currentContext().setResumeCheckpoint(lastReplayId);
    }
}

/*
 * ============================================================================
 * CDC TRIGGER BEST PRACTICES
 * ============================================================================
 *
 * 1. ENABLE CDC FOR OBJECT
 *    Setup → Integrations → Change Data Capture → Select Objects
 *
 * 2. HANDLE ALL CHANGE TYPES
 *    - CREATE: New record
 *    - UPDATE: Record modified
 *    - DELETE: Record deleted
 *    - UNDELETE: Record restored from recycle bin
 *    - GAP_*: Events were missed (sync required)
 *    - GAP_OVERFLOW: Too many changes (full sync needed)
 *
 * 3. USE CHANGEDEVENTHEAD FOR METADATA
 *    - getChangeType(): Operation type
 *    - getChangedFields(): List of changed field API names
 *    - getRecordIds(): Affected record IDs
 *    - getCommitTimestamp(): When change occurred
 *
 * 4. FIELD VALUES IN EVENT
 *    - Changed fields have new values
 *    - Unchanged fields are NULL
 *    - Use changedFields list to know what changed
 *
 * 5. IDEMPOTENT HANDLERS
 *    - Same event might fire multiple times
 *    - Use transactionKey to detect duplicates
 *    - Design handlers to be safe for replay
 *
 * 6. BULK CONSIDERATIONS
 *    - Multiple records can be in single event (batch DML)
 *    - Use getRecordIds() to get all affected IDs
 *    - Process all record IDs efficiently
 *
 * ============================================================================
 */

<?xml version="1.0" encoding="UTF-8"?>
<!--
    CSP Trusted Site Template

    Use this template when creating integration skills that make HTTP callouts
    to external APIs.

    RECOMMENDED: This is the MODERN approach (API 48+ / Spring '20+)
    that replaces Remote Site Settings.

    CSP (Content Security Policy) advantages:
    - More granular control over security contexts
    - Better alignment with web security standards
    - Per-context security (Apex, Lightning, etc.)
    - Future-proof

    Setup:
    1. Copy this file to your skill's assets/ directory
    2. Replace {{placeholders}} with your values
    3. Deploy to org OR let setup script deploy automatically

    File Location: force-app/main/default/cspTrustedSites/{{APIName}}.cspTrustedSite-meta.xml
-->
<CspTrustedSite xmlns="http://soap.sforce.com/2006/04/metadata">
    <!-- API Name - must be unique, alphanumeric only -->
    <fullName>{{APIName}}</fullName>

    <!-- Description - what this endpoint is for -->
    <description>{{Description}}</description>

    <!-- Endpoint URL - the base domain (no trailing slash) -->
    <!-- Examples:
         - https://api.stripe.com
         - https://api.twilio.com
         - https://graph.microsoft.com
    -->
    <endpointUrl>{{BaseURL}}</endpointUrl>

    <!-- Active - set to true to enable -->
    <isActive>true</isActive>

    <!--
    Context: Where this trusted site applies

    Available contexts:
    - All: Apply to all contexts (recommended for most integrations)
    - Connect: Apex HTTP callouts only
    - Frame: iframe embedding
    - Img: Image resources
    - Script: JavaScript resources
    - Style: CSS resources

    For Apex HTTP callouts (most common), use either:
    - "All" (simplest, covers everything)
    - "Connect" (most specific, Apex callouts only)
    -->
    <context>{{Context}}</context>
</CspTrustedSite>

<?xml version="1.0" encoding="UTF-8"?>
<!--
    Remote Site Setting Template

    Use this template when creating integration skills that make HTTP callouts
    to external APIs.

    IMPORTANT:
    - This is the LEGACY approach (still works in all API versions)
    - For API 48+ (Spring '20+), prefer CSP Trusted Sites (see example.cspTrustedSite-meta.xml)

    Setup:
    1. Copy this file to your skill's assets/ directory
    2. Replace {{placeholders}} with your values
    3. Deploy to org OR let setup script deploy automatically

    File Location: force-app/main/default/remoteSiteSettings/{{APIName}}.remoteSite-meta.xml
-->
<RemoteSiteSetting xmlns="http://soap.sforce.com/2006/04/metadata">
    <!-- API Name - must be unique, alphanumeric only -->
    <fullName>{{APIName}}</fullName>

    <!-- Description - what this endpoint is for -->
    <description>{{Description}}</description>

    <!-- Security - ALWAYS keep this false (don't allow HTTP, only HTTPS) -->
    <disableProtocolSecurity>false</disableProtocolSecurity>

    <!-- Active - set to true to enable -->
    <isActive>true</isActive>

    <!-- URL - the base domain (no path, no trailing slash) -->
    <!-- Examples:
         - https://api.stripe.com
         - https://api.twilio.com
         - https://graph.microsoft.com
    -->
    <url>{{BaseURL}}</url>
</RemoteSiteSetting>

<?xml version="1.0" encoding="UTF-8"?>
<!--
    External Credential Template: JWT (API 61+)

    Use Case: JWT Bearer authentication for server-to-server
    - Machine-to-machine authentication
    - Service account integrations
    - High-security API access

    API Version: 61.0+ (Spring '24+) REQUIRED

    Prerequisites:
    1. Create certificate in Setup → Certificate and Key Management
    2. Register public key with external system
    3. Configure JWT claims as required by external API

    Setup Steps:
    1. Replace all {{placeholder}} values
    2. Upload certificate to Salesforce
    3. Deploy to org
    4. Create Named Credential referencing this External Credential

    File Location: force-app/main/default/externalCredentials/{{CredentialName}}.externalCredential-meta.xml
-->
<ExternalCredential xmlns="http://soap.sforce.com/2006/04/metadata">
    <label>{{CredentialLabel}}</label>

    <!-- JWT Authentication Protocol -->
    <authenticationProtocol>Jwt</authenticationProtocol>

    <!--
    JWT Configuration Parameters
    -->

    <!-- Issuer claim (iss) - typically your client ID or service identifier -->
    <externalCredentialParameters>
        <parameterName>issuer</parameterName>
        <parameterType>SigningCertificate</parameterType>
        <parameterValue>{{CertificateName}}</parameterValue>
    </externalCredentialParameters>

    <!-- Subject claim (sub) - the identity being asserted -->
    <externalCredentialParameters>
        <parameterName>subject</parameterName>
        <parameterType>Custom</parameterType>
        <parameterValue>{{SubjectIdentifier}}</parameterValue>
    </externalCredentialParameters>

    <!-- Audience claim (aud) - intended recipient of the JWT -->
    <externalCredentialParameters>
        <parameterName>audience</parameterName>
        <parameterType>Custom</parameterType>
        <parameterValue>{{AudienceUrl}}</parameterValue>
    </externalCredentialParameters>

    <!-- Token endpoint for JWT exchange -->
    <externalCredentialParameters>
        <parameterName>tokenEndpoint</parameterName>
        <parameterType>AuthProviderTokenEndpoint</parameterType>
        <parameterValue>{{TokenEndpoint}}</parameterValue>
    </externalCredentialParameters>

    <!-- JWT Expiration (in seconds) -->
    <externalCredentialParameters>
        <parameterName>expirationOffset</parameterName>
        <parameterType>Custom</parameterType>
        <parameterValue>3600</parameterValue>
    </externalCredentialParameters>

    <!-- Named Principal for JWT auth -->
    <principals>
        <principalName>{{PrincipalName}}</principalName>
        <principalType>NamedPrincipal</principalType>
        <sequenceNumber>1</sequenceNumber>
    </principals>

    <!--
    JWT Token Flow:
    1. Salesforce creates JWT with claims (iss, sub, aud, exp)
    2. JWT signed with certificate private key
    3. JWT sent to token endpoint
    4. External system validates signature with public key
    5. Access token returned
    6. Access token used for API calls

    Custom Claims:
    Add additional externalCredentialParameters with parameterType="Custom"
    to include custom claims required by your external system.
    -->
</ExternalCredential>

<?xml version="1.0" encoding="UTF-8"?>
<!--
    External Credential Template: OAuth 2.0 (API 61+)

    Use Case: Modern OAuth 2.0 with Named Principal or Per-User authentication
    - New integrations (recommended over legacy Named Credentials)
    - APIs requiring per-user context
    - Fine-grained permission control via Permission Sets

    API Version: 61.0+ (Spring '24+) REQUIRED

    Key Concepts:
    - External Credential: Defines auth protocol and parameters
    - Named Principal: Shared service account identity
    - Per-User Principal: Individual user authentication
    - Permission Set: Controls access to principals

    Setup Steps:
    1. Replace all {{placeholder}} values
    2. Deploy to org
    3. Create Named Credential referencing this External Credential
    4. Assign Permission Set to users

    File Location: force-app/main/default/externalCredentials/{{CredentialName}}.externalCredential-meta.xml
-->
<ExternalCredential xmlns="http://soap.sforce.com/2006/04/metadata">
    <label>{{CredentialLabel}}</label>

    <!-- Authentication Protocol: Oauth, Custom, NoAuth, JWT, JwtExchange -->
    <authenticationProtocol>Oauth</authenticationProtocol>

    <!--
    OAuth Parameters
    These define how Salesforce obtains and refreshes tokens
    -->
    <externalCredentialParameters>
        <parameterName>clientId</parameterName>
        <parameterType>AuthProviderClientId</parameterType>
        <parameterValue>{{ClientId}}</parameterValue>
    </externalCredentialParameters>

    <externalCredentialParameters>
        <parameterName>clientSecret</parameterName>
        <parameterType>AuthProviderClientSecret</parameterType>
        <!-- Value entered via UI for security -->
    </externalCredentialParameters>

    <externalCredentialParameters>
        <parameterName>scope</parameterName>
        <parameterType>AuthProviderScope</parameterType>
        <parameterValue>{{Scopes}}</parameterValue>
    </externalCredentialParameters>

    <externalCredentialParameters>
        <parameterName>tokenEndpoint</parameterName>
        <parameterType>AuthProviderTokenEndpoint</parameterType>
        <parameterValue>{{TokenEndpoint}}</parameterValue>
    </externalCredentialParameters>

    <!--
    Named Principal Configuration
    Shared service account for all users with permission
    -->
    <principals>
        <principalName>{{PrincipalName}}</principalName>
        <principalType>NamedPrincipal</principalType>
        <sequenceNumber>1</sequenceNumber>
    </principals>

    <!--
    Optional: Per-User Principal
    Each user authenticates individually

    <principals>
        <principalName>PerUserPrincipal</principalName>
        <principalType>PerUserPrincipal</principalType>
        <sequenceNumber>2</sequenceNumber>
    </principals>
    -->

    <!--
    Permission Set Integration:
    After deployment, create Permission Set with:
    - External Credential Principal Access: {{PrincipalName}}
    - Assign to users who need API access
    -->
</ExternalCredential>

<?xml version="1.0" encoding="UTF-8"?>
<!--
    External Service Registration Template: OpenAPI/Swagger

    Use Case: Auto-generate Apex from OpenAPI specification
    - REST API integrations
    - Type-safe API calls
    - Automatic request/response serialization

    Supported Schema Types:
    - OpenApi3 (OpenAPI 3.0.x) - RECOMMENDED
    - OpenApi (OpenAPI 2.0 / Swagger)

    Prerequisites:
    1. Named Credential configured for authentication
    2. Valid OpenAPI specification (JSON or YAML)

    Setup Steps:
    1. Replace {{placeholder}} values
    2. Embed OpenAPI schema OR reference URL
    3. Deploy to org
    4. Use generated Apex classes: ExternalService.{{ServiceName}}

    File Location: force-app/main/default/externalServiceRegistrations/{{ServiceName}}.externalServiceRegistration-meta.xml
-->
<ExternalServiceRegistration xmlns="http://soap.sforce.com/2006/04/metadata">
    <!-- Display name in Setup -->
    <label>{{ServiceLabel}}</label>

    <!-- Description of the service -->
    <description>{{ServiceDescription}}</description>

    <!--
    Named Credential for authentication
    Must be deployed BEFORE this External Service
    -->
    <namedCredential>{{NamedCredentialName}}</namedCredential>

    <!--
    Schema Type: OpenApi3 or OpenApi (2.0)
    OpenAPI 3.0 is recommended for new integrations
    -->
    <schemaType>OpenApi3</schemaType>

    <!--
    Status: Complete, Draft, or Invalid
    Set to Complete for production use
    -->
    <status>Complete</status>

    <!--
    OpenAPI Schema Content
    Embed the full OpenAPI JSON schema here
    OR use schemaUrl to reference external URL

    Example minimal OpenAPI 3.0 schema:
    -->
    <schema>
{
  "openapi": "3.0.0",
  "info": {
    "title": "{{ServiceTitle}}",
    "version": "1.0.0",
    "description": "{{ServiceDescription}}"
  },
  "servers": [
    {
      "url": "{{BaseUrl}}"
    }
  ],
  "paths": {
    "/{{resourcePath}}": {
      "get": {
        "operationId": "get{{ResourceName}}",
        "summary": "Get {{ResourceName}}",
        "parameters": [
          {
            "name": "id",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Success",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/{{ResourceName}}"
                }
              }
            }
          }
        }
      },
      "post": {
        "operationId": "create{{ResourceName}}",
        "summary": "Create {{ResourceName}}",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/{{ResourceName}}Input"
              }
            }
          }
        },
        "responses": {
          "201": {
            "description": "Created",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/{{ResourceName}}"
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "{{ResourceName}}": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string"
          },
          "name": {
            "type": "string"
          },
          "createdAt": {
            "type": "string",
            "format": "date-time"
          }
        }
      },
      "{{ResourceName}}Input": {
        "type": "object",
        "required": ["name"],
        "properties": {
          "name": {
            "type": "string"
          }
        }
      }
    }
  }
}
    </schema>

    <!--
    Alternative: Reference schema from URL
    <schemaUrl>https://api.example.com/openapi.json</schemaUrl>
    -->

    <!--
    Operations configuration
    Define which operations to include/exclude
    -->
    <operations>
        <active>true</active>
        <name>get{{ResourceName}}</name>
    </operations>
    <operations>
        <active>true</active>
        <name>create{{ResourceName}}</name>
    </operations>

    <!--
    Generated Apex Usage:

    // Get instance of the service
    ExternalService.{{ServiceName}} service = new ExternalService.{{ServiceName}}();

    // Call GET operation
    ExternalService.{{ServiceName}}_get{{ResourceName}}_Response resp =
        service.get{{ResourceName}}('record-id-123');

    // Call POST operation
    ExternalService.{{ServiceName}}_create{{ResourceName}}_Request req =
        new ExternalService.{{ServiceName}}_create{{ResourceName}}_Request();
    req.name = 'New Item';
    ExternalService.{{ServiceName}}_create{{ResourceName}}_Response resp =
        service.create{{ResourceName}}(req);
    -->
</ExternalServiceRegistration>

<?xml version="1.0" encoding="UTF-8"?>
<!--
    Named Credential Template: Certificate-Based Authentication (Mutual TLS)

    Use Case: High-security integrations requiring client certificate
    - Financial services APIs
    - Government integrations
    - Healthcare systems (HIPAA compliance)
    - Any API requiring mutual TLS (mTLS)

    Prerequisites:
    1. Obtain client certificate from external system or CA
    2. Import certificate to Setup → Certificate and Key Management
    3. Ensure external system trusts Salesforce's certificate

    Setup Steps:
    1. Replace all {{placeholder}} values
    2. Upload certificate to Salesforce
    3. Deploy to org
    4. Test connection

    File Location: force-app/main/default/namedCredentials/{{CredentialName}}.namedCredential-meta.xml
-->
<NamedCredential xmlns="http://soap.sforce.com/2006/04/metadata">
    <fullName>{{CredentialName}}</fullName>
    <label>{{CredentialLabel}}</label>

    <!-- Base URL for the external service (must be HTTPS) -->
    <endpoint>{{BaseEndpoint}}</endpoint>

    <!-- Authentication Configuration -->
    <principalType>Anonymous</principalType>
    <protocol>NoAuthentication</protocol>

    <!--
    Client Certificate for Mutual TLS
    Certificate must be imported in Setup → Certificate and Key Management
    The certificate's private key is used to authenticate the client
    -->
    <certificate>{{CertificateName}}</certificate>

    <!-- Request Options -->
    <generateAuthorizationHeader>false</generateAuthorizationHeader>
    <allowMergeFieldsInBody>true</allowMergeFieldsInBody>
    <allowMergeFieldsInHeader>true</allowMergeFieldsInHeader>

    <!--
    Mutual TLS Flow:
    1. Salesforce initiates HTTPS connection
    2. External server presents its certificate
    3. Salesforce validates server certificate
    4. Salesforce presents client certificate
    5. External server validates Salesforce's certificate
    6. Encrypted channel established
    7. API requests proceed

    IMPORTANT:
    - Certificate must have valid chain to trusted CA
    - Certificate must not be expired
    - External system must have Salesforce's public cert in truststore
    -->
</NamedCredential>

<?xml version="1.0" encoding="UTF-8"?>
<!--
    Named Credential Template: Custom Authentication (API Key / Basic Auth)

    Use Case: Simple APIs with API key or username/password
    - Internal APIs
    - Legacy systems
    - APIs with simple authentication
    - Development/testing environments

    Authentication Types:
    - Basic Auth: Username + Password in Authorization header
    - API Key: Custom header with API key value

    Setup Steps:
    1. Replace all {{placeholder}} values
    2. Deploy to org
    3. Enter credentials via Setup → Named Credentials UI

    File Location: force-app/main/default/namedCredentials/{{CredentialName}}.namedCredential-meta.xml
-->
<NamedCredential xmlns="http://soap.sforce.com/2006/04/metadata">
    <fullName>{{CredentialName}}</fullName>
    <label>{{CredentialLabel}}</label>

    <!-- Base URL for the external service -->
    <endpoint>{{BaseEndpoint}}</endpoint>

    <!--
    Authentication Configuration

    For Basic Auth:
    - principalType: NamedUser
    - protocol: Password
    - generateAuthorizationHeader: true

    For API Key (via custom header):
    - principalType: Anonymous
    - protocol: NoAuthentication
    - Use calloutOptions or Apex to add header
    -->
    <principalType>NamedUser</principalType>
    <protocol>Password</protocol>

    <!--
    Username for Basic Auth
    Password is entered via UI after deployment (NOT stored in metadata)
    -->
    <username>{{Username}}</username>

    <!-- Request Options -->
    <generateAuthorizationHeader>true</generateAuthorizationHeader>
    <allowMergeFieldsInBody>true</allowMergeFieldsInBody>
    <allowMergeFieldsInHeader>true</allowMergeFieldsInHeader>

    <!--
    SECURITY WARNING:
    - Password is stored securely by Salesforce, NOT in this file
    - After deployment, configure password via:
      Setup → Named Credentials → Edit → Enter Password
    - Never commit passwords to source control

    For API Key pattern (in Apex):

    HttpRequest req = new HttpRequest();
    req.setEndpoint('callout:{{CredentialName}}/endpoint');
    req.setHeader('X-API-Key', '{!$Credential.Password}');

    Or use External Credentials (API 61+) with Custom headers for cleaner API key handling.
    -->
</NamedCredential>

<?xml version="1.0" encoding="UTF-8"?>
<!--
    Named Credential Template: OAuth 2.0 Client Credentials Flow

    Use Case: Server-to-server integration without user context
    - Machine-to-machine authentication
    - Backend service integrations
    - Scheduled jobs calling external APIs

    Setup Steps:
    1. Replace all {{placeholder}} values
    2. Create corresponding Auth Provider if using OAuth
    3. Deploy to org
    4. Store client credentials in Setup → Named Credentials

    File Location: force-app/main/default/namedCredentials/{{CredentialName}}.namedCredential-meta.xml
-->
<NamedCredential xmlns="http://soap.sforce.com/2006/04/metadata">
    <fullName>{{CredentialName}}</fullName>
    <label>{{CredentialLabel}}</label>

    <!-- Base URL for the external service (without trailing slash) -->
    <endpoint>{{BaseEndpoint}}</endpoint>

    <!-- Authentication Configuration -->
    <principalType>NamedUser</principalType>
    <protocol>Oauth</protocol>

    <!-- OAuth Settings -->
    <!-- Token endpoint where Salesforce requests access tokens -->
    <oauthTokenEndpoint>{{TokenEndpoint}}</oauthTokenEndpoint>

    <!-- Space-separated OAuth scopes (e.g., "read write") -->
    <oauthScope>{{Scopes}}</oauthScope>

    <!-- Auth Provider reference (create this first in Setup → Auth Providers) -->
    <!-- <authProvider>{{AuthProviderName}}</authProvider> -->

    <!-- Request Options -->
    <generateAuthorizationHeader>true</generateAuthorizationHeader>
    <allowMergeFieldsInBody>true</allowMergeFieldsInBody>
    <allowMergeFieldsInHeader>true</allowMergeFieldsInHeader>

    <!--
    Client ID and Secret are stored via UI, NOT in metadata for security.
    After deployment:
    1. Go to Setup → Named Credentials
    2. Edit the credential
    3. Enter Client ID and Client Secret
    -->
</NamedCredential>

<?xml version="1.0" encoding="UTF-8"?>
<!--
    Named Credential Template: OAuth 2.0 JWT Bearer Flow

    Use Case: Server-to-server with certificate-based authentication
    - CI/CD pipelines
    - Backend service integrations
    - Automated jobs requiring strong authentication

    Prerequisites:
    1. Create certificate in Setup → Certificate and Key Management
    2. Create Connected App with JWT Bearer enabled
    3. Upload public certificate to external system
    4. Pre-authorize Connected App for users

    Setup Steps:
    1. Replace all {{placeholder}} values
    2. Ensure certificate is uploaded
    3. Configure Connected App for JWT
    4. Deploy to org

    File Location: force-app/main/default/namedCredentials/{{CredentialName}}.namedCredential-meta.xml
-->
<NamedCredential xmlns="http://soap.sforce.com/2006/04/metadata">
    <fullName>{{CredentialName}}</fullName>
    <label>{{CredentialLabel}}</label>

    <!-- Base URL for the external service -->
    <endpoint>{{BaseEndpoint}}</endpoint>

    <!-- Authentication Configuration -->
    <principalType>NamedUser</principalType>
    <protocol>Oauth</protocol>

    <!-- JWT Bearer Settings -->
    <oauthTokenEndpoint>{{TokenEndpoint}}</oauthTokenEndpoint>
    <oauthScope>{{Scopes}}</oauthScope>

    <!--
    Certificate for signing JWT assertions
    Must exist in Setup → Certificate and Key Management
    -->
    <certificate>{{CertificateName}}</certificate>

    <!-- Auth Provider (configure for JWT Bearer) -->
    <!-- <authProvider>{{AuthProviderName}}</authProvider> -->

    <!-- Request Options -->
    <generateAuthorizationHeader>true</generateAuthorizationHeader>
    <allowMergeFieldsInBody>true</allowMergeFieldsInBody>
    <allowMergeFieldsInHeader>true</allowMergeFieldsInHeader>

    <!--
    JWT Bearer Flow Details:
    1. Salesforce creates JWT assertion signed with certificate
    2. JWT is sent to token endpoint
    3. External system validates signature
    4. Access token returned
    5. Access token used for API calls

    JWT Claims (automatically generated):
    - iss: Client ID
    - sub: Username (for SF-to-SF) or service account
    - aud: Token endpoint
    - exp: Expiration timestamp
    -->
</NamedCredential>

/**
 * @description Platform Event Publisher for {{EventName}}__e
 *
 * Use Case: Publish events from Apex
 * - Trigger-based event publishing
 * - Service layer event notifications
 * - Batch job completion events
 *
 * Features:
 * - Single and bulk event publishing
 * - Error handling and logging
 * - Partial success handling for bulk publishes
 *
 * @author {{Author}}
 * @date {{Date}}
 */
public with sharing class {{EventName}}Publisher {

    /**
     * @description Publish a single event
     * @param recordId ID of the triggering record
     * @param operation Operation type (CREATE, UPDATE, DELETE)
     * @param payload JSON payload data
     * @throws EventPublishException if publish fails
     */
    public static void publishEvent(Id recordId, String operation, Map<String, Object> payload) {
        {{EventName}}__e event = new {{EventName}}__e();
        event.Record_Id__c = recordId;
        event.Operation__c = operation;
        event.Payload__c = JSON.serialize(payload);
        event.Correlation_Id__c = generateCorrelationId();
        event.Event_Timestamp__c = Datetime.now();

        Database.SaveResult result = EventBus.publish(event);

        if (!result.isSuccess()) {
            String errorMessage = getErrorMessage(result);
            System.debug(LoggingLevel.ERROR, 'Event publish failed: ' + errorMessage);
            throw new EventPublishException('Failed to publish event: ' + errorMessage);
        }

        System.debug(LoggingLevel.DEBUG, 'Event published successfully. Correlation ID: ' + event.Correlation_Id__c);
    }

    /**
     * @description Publish multiple events in bulk
     * @param events List of events to publish
     * @return List of publish results
     */
    public static List<PublishResult> publishEvents(List<{{EventName}}__e> events) {
        if (events == null || events.isEmpty()) {
            return new List<PublishResult>();
        }

        // Ensure correlation IDs and timestamps
        for ({{EventName}}__e event : events) {
            if (String.isBlank(event.Correlation_Id__c)) {
                event.Correlation_Id__c = generateCorrelationId();
            }
            if (event.Event_Timestamp__c == null) {
                event.Event_Timestamp__c = Datetime.now();
            }
        }

        List<Database.SaveResult> results = EventBus.publish(events);

        List<PublishResult> publishResults = new List<PublishResult>();
        for (Integer i = 0; i < results.size(); i++) {
            Database.SaveResult sr = results[i];
            {{EventName}}__e event = events[i];

            PublishResult pr = new PublishResult();
            pr.correlationId = event.Correlation_Id__c;
            pr.success = sr.isSuccess();

            if (!sr.isSuccess()) {
                pr.errorMessage = getErrorMessage(sr);
                System.debug(LoggingLevel.ERROR,
                    'Event publish failed for correlation ' + pr.correlationId + ': ' + pr.errorMessage);
            }

            publishResults.add(pr);
        }

        return publishResults;
    }

    /**
     * @description Publish events for record changes (use in triggers)
     * @param records Changed records
     * @param operation Operation type
     */
    public static void publishForRecords(List<SObject> records, String operation) {
        if (records == null || records.isEmpty()) {
            return;
        }

        List<{{EventName}}__e> events = new List<{{EventName}}__e>();

        for (SObject record : records) {
            {{EventName}}__e event = new {{EventName}}__e();
            event.Record_Id__c = record.Id;
            event.Operation__c = operation;
            event.Payload__c = JSON.serialize(record);
            event.Correlation_Id__c = generateCorrelationId();
            event.Event_Timestamp__c = Datetime.now();
            events.add(event);
        }

        List<PublishResult> results = publishEvents(events);

        // Log any failures
        for (PublishResult pr : results) {
            if (!pr.success) {
                System.debug(LoggingLevel.ERROR, 'Publish failed: ' + pr.errorMessage);
            }
        }
    }

    /**
     * @description Create event from Map (flexible payload)
     * @param eventData Map containing event fields
     * @return Constructed event
     */
    public static {{EventName}}__e createEvent(Map<String, Object> eventData) {
        {{EventName}}__e event = new {{EventName}}__e();

        if (eventData.containsKey('recordId')) {
            event.Record_Id__c = (String) eventData.get('recordId');
        }
        if (eventData.containsKey('operation')) {
            event.Operation__c = (String) eventData.get('operation');
        }
        if (eventData.containsKey('payload')) {
            Object payload = eventData.get('payload');
            event.Payload__c = payload instanceof String
                ? (String) payload
                : JSON.serialize(payload);
        }
        if (eventData.containsKey('correlationId')) {
            event.Correlation_Id__c = (String) eventData.get('correlationId');
        } else {
            event.Correlation_Id__c = generateCorrelationId();
        }

        event.Event_Timestamp__c = Datetime.now();

        return event;
    }

    /**
     * @description Generate unique correlation ID
     * @return UUID-like correlation ID
     */
    private static String generateCorrelationId() {
        Blob b = Crypto.generateAesKey(128);
        String h = EncodingUtil.convertToHex(b);
        return h.substring(0, 8) + '-' +
               h.substring(8, 12) + '-' +
               h.substring(12, 16) + '-' +
               h.substring(16, 20) + '-' +
               h.substring(20);
    }

    /**
     * @description Extract error message from SaveResult
     * @param result Database.SaveResult
     * @return Error message string
     */
    private static String getErrorMessage(Database.SaveResult result) {
        List<String> messages = new List<String>();
        for (Database.Error err : result.getErrors()) {
            messages.add(err.getStatusCode() + ': ' + err.getMessage());
        }
        return String.join(messages, '; ');
    }

    /**
     * @description Result wrapper for bulk publish operations
     */
    public class PublishResult {
        public String correlationId;
        public Boolean success;
        public String errorMessage;
    }

    /**
     * @description Exception for event publish failures
     */
    public class EventPublishException extends Exception {}
}

/**
 * @description Platform Event Handler/Action Class for {{EventName}}__e
 *
 * Use Case: Business logic for processing Platform Events
 * - Separated from trigger for testability
 * - TAF-compatible action pattern
 * - Bulkified processing
 *
 * This class is called by the {{EventName}}Subscriber trigger
 * and contains all business logic for event processing.
 *
 * @author {{Author}}
 * @date {{Date}}
 */
public with sharing class {{EventName}}Handler {

    /**
     * @description Handle CREATE operation events
     * @param event The platform event
     */
    public static void handleCreate({{EventName}}__e event) {
        Map<String, Object> payload = parsePayload(event.Payload__c);

        // Example: Create a record based on event data
        /*
        {{TargetObject}}__c newRecord = new {{TargetObject}}__c();
        newRecord.Name = (String) payload.get('name');
        newRecord.External_Id__c = event.Record_Id__c;
        newRecord.Source_System__c = 'Platform Event';
        insert newRecord;
        */

        System.debug(LoggingLevel.DEBUG,
            'Processed CREATE event: ' + event.Correlation_Id__c);
    }

    /**
     * @description Handle UPDATE operation events
     * @param event The platform event
     */
    public static void handleUpdate({{EventName}}__e event) {
        Map<String, Object> payload = parsePayload(event.Payload__c);
        String recordId = event.Record_Id__c;

        // Example: Update existing record
        /*
        List<{{TargetObject}}__c> records = [
            SELECT Id, Name
            FROM {{TargetObject}}__c
            WHERE External_Id__c = :recordId
            WITH USER_MODE
            LIMIT 1
        ];

        if (!records.isEmpty()) {
            {{TargetObject}}__c record = records[0];
            record.Name = (String) payload.get('name');
            record.Last_Sync__c = Datetime.now();
            update record;
        }
        */

        System.debug(LoggingLevel.DEBUG,
            'Processed UPDATE event: ' + event.Correlation_Id__c);
    }

    /**
     * @description Handle DELETE operation events
     * @param event The platform event
     */
    public static void handleDelete({{EventName}}__e event) {
        String recordId = event.Record_Id__c;

        // Example: Delete or archive record
        /*
        List<{{TargetObject}}__c> records = [
            SELECT Id
            FROM {{TargetObject}}__c
            WHERE External_Id__c = :recordId
            WITH USER_MODE
            LIMIT 1
        ];

        if (!records.isEmpty()) {
            delete records;
        }
        */

        System.debug(LoggingLevel.DEBUG,
            'Processed DELETE event: ' + event.Correlation_Id__c);
    }

    /**
     * @description Handle bulk events (for optimized processing)
     *              Call this from trigger instead of individual handlers
     *              when processing high volumes
     * @param events List of events to process
     */
    public static void handleBulk(List<{{EventName}}__e> events) {
        // Separate events by operation
        List<{{EventName}}__e> createEvents = new List<{{EventName}}__e>();
        List<{{EventName}}__e> updateEvents = new List<{{EventName}}__e>();
        List<{{EventName}}__e> deleteEvents = new List<{{EventName}}__e>();

        for ({{EventName}}__e event : events) {
            switch on event.Operation__c {
                when 'CREATE' {
                    createEvents.add(event);
                }
                when 'UPDATE' {
                    updateEvents.add(event);
                }
                when 'DELETE' {
                    deleteEvents.add(event);
                }
            }
        }

        // Process each operation type in bulk
        if (!createEvents.isEmpty()) {
            handleBulkCreate(createEvents);
        }
        if (!updateEvents.isEmpty()) {
            handleBulkUpdate(updateEvents);
        }
        if (!deleteEvents.isEmpty()) {
            handleBulkDelete(deleteEvents);
        }
    }

    /**
     * @description Bulk create handler
     * @param events CREATE events
     */
    private static void handleBulkCreate(List<{{EventName}}__e> events) {
        List<{{TargetObject}}__c> newRecords = new List<{{TargetObject}}__c>();

        for ({{EventName}}__e event : events) {
            Map<String, Object> payload = parsePayload(event.Payload__c);

            {{TargetObject}}__c record = new {{TargetObject}}__c();
            // Map fields from payload
            // record.Name = (String) payload.get('name');
            // record.External_Id__c = event.Record_Id__c;

            newRecords.add(record);
        }

        if (!newRecords.isEmpty()) {
            // Use Database.insert for partial success handling
            Database.SaveResult[] results = Database.insert(newRecords, false);
            logDmlResults(results, 'CREATE');
        }
    }

    /**
     * @description Bulk update handler
     * @param events UPDATE events
     */
    private static void handleBulkUpdate(List<{{EventName}}__e> events) {
        // Collect external IDs to query
        Set<String> externalIds = new Set<String>();
        Map<String, {{EventName}}__e> eventsByExternalId = new Map<String, {{EventName}}__e>();

        for ({{EventName}}__e event : events) {
            externalIds.add(event.Record_Id__c);
            eventsByExternalId.put(event.Record_Id__c, event);
        }

        // Query existing records
        /*
        Map<String, {{TargetObject}}__c> recordsByExternalId = new Map<String, {{TargetObject}}__c>();
        for ({{TargetObject}}__c record : [
            SELECT Id, External_Id__c, Name
            FROM {{TargetObject}}__c
            WHERE External_Id__c IN :externalIds
            WITH USER_MODE
        ]) {
            recordsByExternalId.put(record.External_Id__c, record);
        }

        // Update records
        List<{{TargetObject}}__c> toUpdate = new List<{{TargetObject}}__c>();
        for (String extId : externalIds) {
            if (recordsByExternalId.containsKey(extId)) {
                {{TargetObject}}__c record = recordsByExternalId.get(extId);
                {{EventName}}__e event = eventsByExternalId.get(extId);
                Map<String, Object> payload = parsePayload(event.Payload__c);

                // Update fields
                // record.Name = (String) payload.get('name');
                toUpdate.add(record);
            }
        }

        if (!toUpdate.isEmpty()) {
            Database.SaveResult[] results = Database.update(toUpdate, false);
            logDmlResults(results, 'UPDATE');
        }
        */
    }

    /**
     * @description Bulk delete handler
     * @param events DELETE events
     */
    private static void handleBulkDelete(List<{{EventName}}__e> events) {
        Set<String> externalIds = new Set<String>();
        for ({{EventName}}__e event : events) {
            externalIds.add(event.Record_Id__c);
        }

        /*
        List<{{TargetObject}}__c> toDelete = [
            SELECT Id
            FROM {{TargetObject}}__c
            WHERE External_Id__c IN :externalIds
            WITH USER_MODE
        ];

        if (!toDelete.isEmpty()) {
            Database.DeleteResult[] results = Database.delete(toDelete, false);
            logDeleteResults(results, 'DELETE');
        }
        */
    }

    /**
     * @description Parse JSON payload to Map
     * @param payloadJson JSON string
     * @return Parsed Map
     */
    private static Map<String, Object> parsePayload(String payloadJson) {
        if (String.isBlank(payloadJson)) {
            return new Map<String, Object>();
        }

        try {
            return (Map<String, Object>) JSON.deserializeUntyped(payloadJson);
        } catch (JSONException e) {
            System.debug(LoggingLevel.ERROR, 'Failed to parse payload: ' + e.getMessage());
            return new Map<String, Object>();
        }
    }

    /**
     * @description Log DML results for monitoring
     * @param results Database.SaveResult array
     * @param operation Operation name
     */
    private static void logDmlResults(Database.SaveResult[] results, String operation) {
        Integer successCount = 0;
        Integer failCount = 0;

        for (Database.SaveResult sr : results) {
            if (sr.isSuccess()) {
                successCount++;
            } else {
                failCount++;
                for (Database.Error err : sr.getErrors()) {
                    System.debug(LoggingLevel.ERROR,
                        operation + ' failed: ' + err.getStatusCode() + ' - ' + err.getMessage());
                }
            }
        }

        System.debug(LoggingLevel.INFO,
            operation + ' results - Success: ' + successCount + ', Failed: ' + failCount);
    }

    /**
     * @description Log delete results for monitoring
     * @param results Database.DeleteResult array
     * @param operation Operation name
     */
    private static void logDeleteResults(Database.DeleteResult[] results, String operation) {
        Integer successCount = 0;
        Integer failCount = 0;

        for (Database.DeleteResult dr : results) {
            if (dr.isSuccess()) {
                successCount++;
            } else {
                failCount++;
                for (Database.Error err : dr.getErrors()) {
                    System.debug(LoggingLevel.ERROR,
                        operation + ' failed: ' + err.getStatusCode() + ' - ' + err.getMessage());
                }
            }
        }

        System.debug(LoggingLevel.INFO,
            operation + ' results - Success: ' + successCount + ', Failed: ' + failCount);
    }
}

/**
 * @description Platform Event Subscriber Trigger for {{EventName}}__e
 *
 * Use Case: React to published Platform Events
 * - Process incoming events from other systems
 * - Sync data based on events
 * - Trigger downstream processes
 *
 * Key Concepts:
 * - Platform Event triggers run in their own execution context
 * - Events are processed in batches (up to 2000 for High Volume)
 * - ReplayId enables resuming from failures
 * - SetResumeCheckpoint ensures durability
 *
 * IMPORTANT:
 * - Triggers on Platform Events only fire on AFTER INSERT
 * - Events are immutable (cannot be updated or deleted)
 * - Triggers run as Automated Process user
 *
 * @author {{Author}}
 * @date {{Date}}
 */
trigger {{EventName}}Subscriber on {{EventName}}__e (after insert) {

    // Track last processed replay ID for durability
    String lastReplayId = '';

    // Process each event
    for ({{EventName}}__e event : Trigger.new) {
        // Store replay ID for checkpoint
        lastReplayId = event.ReplayId;

        try {
            // Log event receipt
            System.debug(LoggingLevel.DEBUG,
                'Processing event: ' + event.Correlation_Id__c +
                ' Operation: ' + event.Operation__c +
                ' ReplayId: ' + event.ReplayId);

            // Route to handler based on operation
            switch on event.Operation__c {
                when 'CREATE' {
                    {{EventName}}Handler.handleCreate(event);
                }
                when 'UPDATE' {
                    {{EventName}}Handler.handleUpdate(event);
                }
                when 'DELETE' {
                    {{EventName}}Handler.handleDelete(event);
                }
                when else {
                    // Unknown operation - log and continue
                    System.debug(LoggingLevel.WARN,
                        'Unknown operation: ' + event.Operation__c +
                        ' for event: ' + event.Correlation_Id__c);
                }
            }

        } catch (Exception e) {
            // Log error but continue processing other events
            // Don't throw - that would cause retry of ALL events in batch
            System.debug(LoggingLevel.ERROR,
                'Error processing event ' + event.Correlation_Id__c + ': ' + e.getMessage());
            System.debug(LoggingLevel.ERROR, 'Stack: ' + e.getStackTraceString());

            // Consider: Create error log record for monitoring
            // {{EventName}}ErrorLogger.logError(event, e);
        }
    }

    // Set resume checkpoint for durability
    // If trigger fails after this point, processing resumes from this ReplayId
    if (String.isNotBlank(lastReplayId)) {
        EventBus.TriggerContext.currentContext().setResumeCheckpoint(lastReplayId);
    }
}

/*
 * ============================================================================
 * PLATFORM EVENT TRIGGER BEST PRACTICES
 * ============================================================================
 *
 * 1. ALWAYS set resume checkpoint
 *    - Call setResumeCheckpoint() with the last processed ReplayId
 *    - Ensures events aren't lost if trigger fails mid-batch
 *
 * 2. DON'T throw exceptions
 *    - Unhandled exceptions cause entire batch to retry
 *    - Catch errors per-event and log them
 *    - Continue processing remaining events
 *
 * 3. Keep processing lightweight
 *    - Avoid SOQL/DML in loops
 *    - Collect data, then do bulk DML outside loop
 *    - Consider queueing heavy work via Queueable
 *
 * 4. Handle duplicates
 *    - At-least-once delivery means duplicates possible
 *    - Use Correlation_Id__c to detect/dedupe
 *    - Design handlers to be idempotent
 *
 * 5. Monitor failures
 *    - Log errors to custom object for visibility
 *    - Set up alerts for processing failures
 *    - Review Event Delivery Failures in Setup
 *
 * ============================================================================
 */

<?xml version="1.0" encoding="UTF-8"?>
<!--
    Platform Event Definition Template

    Use Case: Asynchronous, event-driven communication
    - Real-time notifications
    - Decoupled system integrations
    - High-volume data streaming
    - Trigger external processes

    Event Types:
    - StandardVolume: ~2,000 events/hour, standard delivery
    - HighVolume: Millions/day, at-least-once delivery, 24-hour retention

    Publish Behaviors:
    - PublishAfterCommit: Event published after transaction commits (default)
    - PublishImmediately: Event published immediately (use for rollback scenarios)

    Setup Steps:
    1. Replace all {{placeholder}} values
    2. Add fields as needed
    3. Deploy to org
    4. Create publisher (Apex, Flow, Process Builder)
    5. Create subscriber (Trigger, Flow, External via CometD)

    File Location: force-app/main/default/objects/{{EventName}}__e/{{EventName}}__e.object-meta.xml
-->
<CustomObject xmlns="http://soap.sforce.com/2006/04/metadata">
    <!-- Deployment status -->
    <deploymentStatus>Deployed</deploymentStatus>

    <!--
    Event Type:
    - StandardVolume: Up to 2,000 events per hour (included in licenses)
    - HighVolume: Up to millions per day (may require additional entitlement)

    Use HighVolume for:
    - Large-scale integrations
    - IoT data streaming
    - High-throughput scenarios
    -->
    <eventType>HighVolume</eventType>

    <!-- Display labels -->
    <label>{{EventLabel}}</label>
    <pluralLabel>{{EventPluralLabel}}</pluralLabel>

    <!--
    Publish Behavior:
    - PublishAfterCommit: Publish when transaction commits (RECOMMENDED)
      Ensures event only fires if data save succeeds
    - PublishImmediately: Publish right away
      Use when you need event even if transaction rolls back
    -->
    <publishBehavior>PublishAfterCommit</publishBehavior>

    <!-- Event Fields -->

    <!-- Record ID field - link to triggering record -->
    <fields>
        <fullName>Record_Id__c</fullName>
        <label>Record ID</label>
        <description>ID of the Salesforce record that triggered this event</description>
        <type>Text</type>
        <length>18</length>
        <externalId>false</externalId>
    </fields>

    <!-- Operation type field -->
    <fields>
        <fullName>Operation__c</fullName>
        <label>Operation</label>
        <description>The operation that occurred: CREATE, UPDATE, DELETE</description>
        <type>Text</type>
        <length>20</length>
        <externalId>false</externalId>
    </fields>

    <!-- Payload field - JSON data -->
    <fields>
        <fullName>Payload__c</fullName>
        <label>Payload</label>
        <description>JSON payload containing event data</description>
        <type>LongTextArea</type>
        <length>131072</length>
        <visibleLines>5</visibleLines>
    </fields>

    <!-- Correlation ID for tracking -->
    <fields>
        <fullName>Correlation_Id__c</fullName>
        <label>Correlation ID</label>
        <description>Unique ID for tracking related events across systems</description>
        <type>Text</type>
        <length>50</length>
        <externalId>true</externalId>
    </fields>

    <!-- Timestamp field -->
    <fields>
        <fullName>Event_Timestamp__c</fullName>
        <label>Event Timestamp</label>
        <description>When the event occurred</description>
        <type>DateTime</type>
    </fields>

    <!--
    Add more fields as needed for your use case.

    Field Types Supported:
    - Text (up to 255 chars)
    - LongTextArea (up to 131,072 chars)
    - Number
    - Checkbox
    - DateTime
    - Date

    NOT Supported:
    - Lookup/Master-Detail (no relationships)
    - Formula
    - Roll-up Summary
    - Picklist (use Text instead)
    -->
</CustomObject>

/**
 * @description SOAP Web Service Callout Service
 *
 * Use Case: Integrations with SOAP/XML-based web services
 * - Legacy enterprise systems
 * - Government APIs
 * - Financial services (often SOAP-based)
 *
 * Prerequisites:
 * 1. Generate Apex from WSDL (Setup → Apex Classes → Generate from WSDL)
 * 2. Configure Named Credential or Remote Site Setting for endpoint
 *
 * This template wraps WSDL-generated stub classes with:
 * - Error handling
 * - Timeout configuration
 * - Logging
 *
 * @author {{Author}}
 * @date {{Date}}
 */
public with sharing class {{ServiceName}}SoapService {

    // Named Credential for SOAP endpoint (recommended over Remote Site Setting)
    private static final String NAMED_CREDENTIAL = 'callout:{{NamedCredentialName}}';

    // Timeout in milliseconds (max 120000)
    private static final Integer TIMEOUT_MS = 120000;

    /**
     * @description Call SOAP operation with request object
     *
     * Replace {{WsdlStubClass}} with your WSDL-generated class name
     * Replace {{PortType}} with the port/binding type from WSDL
     * Replace {{OperationName}} with the SOAP operation to call
     *
     * @param request Request object (WSDL-generated type)
     * @return Response object (WSDL-generated type)
     * @throws SoapCalloutException on errors
     */
    public static {{ResponseType}} callService({{RequestType}} request) {
        try {
            // Instantiate the WSDL-generated stub
            {{WsdlStubClass}}.{{PortType}} stub = new {{WsdlStubClass}}.{{PortType}}();

            // Configure endpoint
            // Option 1: Use Named Credential (recommended)
            stub.endpoint_x = NAMED_CREDENTIAL;

            // Option 2: Direct endpoint (requires Remote Site Setting)
            // stub.endpoint_x = '{{SoapEndpoint}}';

            // Set timeout
            stub.timeout_x = TIMEOUT_MS;

            // Set custom SOAP headers if needed
            // stub.inputHttpHeaders_x = new Map<String, String>{
            //     'X-Custom-Header' => 'value'
            // };

            // Make the SOAP call
            {{ResponseType}} response = stub.{{OperationName}}(request);

            // Log success
            System.debug(LoggingLevel.DEBUG, 'SOAP call successful: {{OperationName}}');

            return response;

        } catch (CalloutException e) {
            // Network/timeout error
            System.debug(LoggingLevel.ERROR, 'SOAP CalloutException: ' + e.getMessage());
            throw new SoapCalloutException('Connection error: ' + e.getMessage(), e);

        } catch (Exception e) {
            // SOAP fault or other error
            System.debug(LoggingLevel.ERROR, 'SOAP Error: ' + e.getMessage());
            System.debug(LoggingLevel.ERROR, 'Stack: ' + e.getStackTraceString());
            throw new SoapCalloutException('SOAP service error: ' + e.getMessage(), e);
        }
    }

    /**
     * @description Async SOAP call via Queueable
     *              Use this when calling from DML context (triggers)
     * @param request Request object
     * @param callbackId Optional ID for tracking the async job
     */
    public static void callServiceAsync({{RequestType}} request, Id callbackId) {
        System.enqueueJob(new SoapCalloutQueueable(request, callbackId));
    }

    /**
     * @description Queueable implementation for async SOAP calls
     */
    public class SoapCalloutQueueable implements Queueable, Database.AllowsCallouts {
        private {{RequestType}} request;
        private Id callbackId;

        public SoapCalloutQueueable({{RequestType}} request, Id callbackId) {
            this.request = request;
            this.callbackId = callbackId;
        }

        public void execute(QueueableContext context) {
            try {
                {{ResponseType}} response = callService(request);

                // Process response and update Salesforce record if needed
                if (callbackId != null) {
                    processCallback(response, callbackId);
                }

            } catch (Exception e) {
                System.debug(LoggingLevel.ERROR, 'Async SOAP call failed: ' + e.getMessage());
                // Consider: create error log, send notification
            }
        }
    }

    /**
     * @description Process async callback result
     * @param response SOAP response
     * @param callbackId Record ID to update with result
     */
    private static void processCallback({{ResponseType}} response, Id callbackId) {
        // TODO: Implement callback processing
        // Example: Update a record with the response data
        /*
        SObject record = callbackId.getSObjectType().newSObject(callbackId);
        record.put('Integration_Status__c', 'Complete');
        record.put('Integration_Response__c', JSON.serialize(response));
        update record;
        */
    }

    /**
     * @description Custom exception for SOAP callout errors
     */
    public class SoapCalloutException extends Exception {}
}

/*
 * ============================================================================
 * WSDL2APEX GENERATION GUIDE
 * ============================================================================
 *
 * Step 1: Obtain WSDL
 * -------------------
 * Get the WSDL file from the external system. It should be an XML file
 * defining the service, operations, and data types.
 *
 * Step 2: Generate Apex Classes
 * -----------------------------
 * 1. Go to Setup → Apex Classes
 * 2. Click "Generate from WSDL"
 * 3. Upload the WSDL file
 * 4. Choose a namespace (or accept default)
 * 5. Click "Generate Apex code"
 *
 * Step 3: Review Generated Classes
 * --------------------------------
 * Salesforce generates:
 * - Stub class ({{WsdlStubClass}}) with methods for each operation
 * - Request/Response wrapper classes
 * - Data type classes matching WSDL schema
 *
 * Step 4: Configure Access
 * ------------------------
 * Option A: Named Credential (Recommended)
 * - Create Named Credential with SOAP endpoint
 * - Set stub.endpoint_x = 'callout:NamedCredentialName'
 *
 * Option B: Remote Site Setting
 * - Create Remote Site Setting with SOAP endpoint domain
 * - Set stub.endpoint_x to full URL
 *
 * Step 5: Test the Integration
 * ----------------------------
 * Execute anonymous Apex:
 *
 * {{RequestType}} req = new {{RequestType}}();
 * req.field1 = 'value';
 * {{ResponseType}} resp = {{ServiceName}}SoapService.callService(req);
 * System.debug(resp);
 *
 * ============================================================================
 */