Generating Lwc Components

/**
 * APEX CONTROLLER TEMPLATE FOR LWC
 *
 * This template demonstrates @AuraEnabled methods for LWC with:
 * - Cacheable methods for wire service
 * - Non-cacheable methods for data mutations
 * - Proper error handling
 * - Security enforcement
 * - Bulk-safe patterns
 *
 * Replace: LwcController → YourControllerName
 */
public with sharing class LwcController {

    // ═══════════════════════════════════════════════════════════════════════
    // CACHEABLE METHODS (For @wire service)
    // ═══════════════════════════════════════════════════════════════════════

    /**
     * Get records for display in LWC
     * Use with @wire decorator for automatic caching and refresh
     *
     * @param parentId - Parent record ID (optional filter)
     * @param searchTerm - Search filter (optional)
     * @param limitSize - Max records to return
     * @return List of Account records
     */
    @AuraEnabled(cacheable=true)
    public static List<Account> getAccounts(Id parentId, String searchTerm, Integer limitSize) {
        try {
            Integer recordLimit = limitSize != null ? limitSize : 50;
            String searchKey = String.isNotBlank(searchTerm)
                ? '%' + String.escapeSingleQuotes(searchTerm) + '%'
                : '%';

            return [
                SELECT Id, Name, Industry, AnnualRevenue, Phone, CreatedDate
                FROM Account
                WHERE Name LIKE :searchKey
                WITH SECURITY_ENFORCED
                ORDER BY Name
                LIMIT :recordLimit
            ];
        } catch (Exception e) {
            throw new AuraHandledException(e.getMessage());
        }
    }

    /**
     * Get single record by ID
     */
    @AuraEnabled(cacheable=true)
    public static Account getAccountById(Id accountId) {
        try {
            List<Account> accounts = [
                SELECT Id, Name, Industry, AnnualRevenue, Phone, BillingAddress,
                       (SELECT Id, FirstName, LastName, Email FROM Contacts LIMIT 5)
                FROM Account
                WHERE Id = :accountId
                WITH SECURITY_ENFORCED
                LIMIT 1
            ];

            if (accounts.isEmpty()) {
                throw new AuraHandledException('Account not found');
            }

            return accounts[0];
        } catch (Exception e) {
            throw new AuraHandledException(e.getMessage());
        }
    }

    /**
     * Get picklist values for a field
     */
    @AuraEnabled(cacheable=true)
    public static List<PicklistOption> getIndustryOptions() {
        List<PicklistOption> options = new List<PicklistOption>();

        Schema.DescribeFieldResult fieldResult = Account.Industry.getDescribe();
        List<Schema.PicklistEntry> entries = fieldResult.getPicklistValues();

        for (Schema.PicklistEntry entry : entries) {
            if (entry.isActive()) {
                options.add(new PicklistOption(entry.getLabel(), entry.getValue()));
            }
        }

        return options;
    }

    // ═══════════════════════════════════════════════════════════════════════
    // NON-CACHEABLE METHODS (For data mutations)
    // ═══════════════════════════════════════════════════════════════════════

    /**
     * Create a new account
     *
     * @param accountData - JSON string of account fields
     * @return Created Account with Id
     */
    @AuraEnabled
    public static Account createAccount(String accountData) {
        try {
            // Parse JSON to Map
            Map<String, Object> fieldMap = (Map<String, Object>) JSON.deserializeUntyped(accountData);

            // Create Account record
            Account newAccount = new Account();
            newAccount.Name = (String) fieldMap.get('Name');
            newAccount.Industry = (String) fieldMap.get('Industry');
            newAccount.Phone = (String) fieldMap.get('Phone');

            // Validate required fields
            if (String.isBlank(newAccount.Name)) {