Godot Genre Puzzle

# skills/genre-puzzle/scripts/command_undo_redo.gd
class_name CommandUndoRedo
extends Node

## Command Pattern Undo/Redo System (Expert Pattern)
## Manages a history of commands to allow unlimited undo/redo functionality.

signal state_changed(can_undo: bool, can_redo: bool)

var history: Array[Command] = []
var history_index: int = -1
const MAX_HISTORY: int = 100

# Abstract Command Class
class Command extends RefCounted:
    func execute() -> void: pass
    func undo() -> void: pass

func commit_command(cmd: Command) -> void:
    # If we are in the middle of history, clear the future
    if history_index < history.size() - 1:
        history = history.slice(0, history_index + 1)
    
    cmd.execute()
    history.append(cmd)
    
    if history.size() > MAX_HISTORY:
        history.pop_front()
    else:
        history_index += 1
        
    _emit_state()

func undo() -> void:
    if history_index >= 0:
        history[history_index].undo()
        history_index -= 1
        _emit_state()

func redo() -> void:
    if history_index < history.size() - 1:
        history_index += 1
        history[history_index].execute()
        _emit_state()

func clear_history() -> void:
    history.clear()
    history_index = -1
    _emit_state()

func _emit_state() -> void:
    state_changed.emit(history_index >= 0, history_index < history.size() - 1)

## EXPERT USAGE:
## Define subclasses of Command (e.g. MoveCommand).
## Instantiate and pass to commit_command().

# grid_input_manager.gd
extends Node
class_name GridInputManager

# Routing Unhandled Grid Input
# Intercepts clicks strictly when the GUI has not consumed them.

func _unhandled_input(event: InputEvent) -> void:
    if event is InputEventMouseButton and event.pressed:
        var grid_pos = _screen_to_grid(event.position)
        _handle_grid_click(grid_pos)
        
        # Pattern: Consume immediately to stop propagation.
        get_viewport().set_input_as_handled()

func _screen_to_grid(_pos: Vector2) -> Vector2i:
    return Vector2i.ZERO

func _handle_grid_click(_grid_pos: Vector2i) -> void:
    pass

# skills/genre-puzzle/scripts/grid_manager.gd
extends Node2D

## Grid Manager (Expert Pattern)
## Manages grid-based movement and logic (Sokoban style).
## Uses Tweens for smooth movement between grid cells.

class_name GridManager

signal object_moved(obj: Node2D, from: Vector2i, to: Vector2i)

@export var grid_size: Vector2i = Vector2i(64, 64)
@export var movement_duration: float = 0.2

var grid_objects: Dictionary = {} # Vector2i: Node2D

func register_object(obj: Node2D, grid_pos: Vector2i) -> void:
    grid_objects[grid_pos] = obj
    obj.position = _grid_to_world(grid_pos)

func try_move(obj: Node2D, direction: Vector2i) -> bool:
    var start_pos = _world_to_grid(obj.position)
    var target_pos = start_pos + direction
    
    # Check bounds (optional)
    
    # Check obstacles
    if grid_objects.has(target_pos):
        var obstacle = grid_objects[target_pos]
        # Push logic?
        if obstacle.has_method("is_pushable") and obstacle.is_pushable():
            if not try_move(obstacle, direction):
                return false # Chain blocked
        else:
            return false # Blocked by static object
            
    # Execute Move
    grid_objects.erase(start_pos)
    grid_objects[target_pos] = obj
    
    var tween = create_tween()
    tween.tween_property(obj, "position", _grid_to_world(target_pos), movement_duration)
    
    object_moved.emit(obj, start_pos, target_pos)
    return true

func _grid_to_world(grid_pos: Vector2i) -> Vector2:
    return Vector2(grid_pos) * Vector2(grid_size) + Vector2(grid_size) / 2.0

func _world_to_grid(world_pos: Vector2) -> Vector2i:
    return Vector2i((world_pos - Vector2(grid_size)/2.0) / Vector2(grid_size))

## EXPERT USAGE:
## Call register_object() in _ready().
## Connect Input to try_move().

extends Node2D
class_name GridTweenMover

## Expert Grid Movement (Godot 4.6).
## Separates logic (Vector2i) from visuals (Tween).

@export var tile_map: TileMapLayer
@export var move_time: float = 0.2

var logical_pos: Vector2i = Vector2i.ZERO
var _is_moving: bool = false

func move(direction: Vector2i) -> void:
	if _is_moving: return
	
	var target = logical_pos + direction
	if _can_move(target):
		_execute_move(target)

func _can_move(target: Vector2i) -> bool:
	var data = tile_map.get_cell_tile_data(target)
	return data != null and data.get_custom_data("walkable")

func _execute_move(target: Vector2i) -> void:
	_is_moving = true
	logical_pos = target # Update logic instantly
	
	var world_pos = tile_map.map_to_local(logical_pos)
	var tween = get_tree().create_tween().set_trans(Tween.TRANS_SINE)
	tween.tween_property(self, "position", world_pos, move_time)
	tween.finished.connect(func(): _is_moving = false)

## [SKILL NOTICE]: Resolve logical state (Vector2i) IMMEDIATELY upon 
## valid input. Use Tweens ONLY for visual representation to avoid race conditions.

# match_three_logic.gd
extends Node
class_name MatchThreeLogic

# Dictionary-Based Grid Flood Fill
# Evaluates spatial logic using a strict Dictionary for board representation.

var board: Dictionary = {} # Vector2i -> gem_id

func check_match_at(pos: Vector2i, gem_id: int) -> void:
    # Pattern: Always verify coordinate existence before key access.
    if pos in board:
        if board[pos] == gem_id:
            # Handle recursion or removal queue here.
            board.erase(pos)
            _notify_match(pos)

func _notify_match(_pos: Vector2i) -> void:
    pass

# perspective_overlay.gd
extends Node3D
class_name PerspectiveOverlay

# 3D to 2D Perspective Projection
# Projects 3D points onto 2D viewport for UI alignment.

@export var camera: Camera3D
@export var ui_element: Control

func update_ui_position(world_point: Vector3) -> void:
    if not camera or not ui_element: return
    
    # Pattern: Use is_position_behind to hide elements behind the lens.
    if not camera.is_position_behind(world_point):
        var screen_pos := camera.unproject_position(world_point)
        ui_element.position = screen_pos
        ui_element.show()
    else:
        ui_element.hide()

# puzzle_history.gd
extends Node
class_name PuzzleHistory

# Action Command Pattern (Undo/Redo System)
# Robust undo history keeping "do" and "undo" methods strictly separated.

var undo_redo := UndoRedo.new()

func execute_move(node: Node2D, target_position: Vector2) -> void:
    undo_redo.create_action("Move Piece")
    
    # Expert Pattern: Group 'do' on one side and 'undo' on the other.
    undo_redo.add_do_property(node, "position", target_position)
    undo_redo.add_undo_property(node, "position", node.position)
    
    undo_redo.commit_action()

func undo_last_move() -> void:
    if undo_redo.has_undo():
        undo_redo.undo()

func redo_last_move() -> void:
    if undo_redo.has_redo():
        undo_redo.redo()

# puzzle_pathfinder.gd
extends Node
class_name PuzzlePathfinder

# High-Performance Grid Pathfinding (AStarGrid2D)
# Specialized grid for puzzles, avoiding manual point connections.

var astar_grid := AStarGrid2D.new()

func setup_grid(grid_rect: Rect2i, cell_dimensions: Vector2) -> void:
    astar_grid.region = grid_rect
    astar_grid.cell_size = cell_dimensions
    
    # Pattern: Update is MANDATORY after modifying parameters.
    astar_grid.update()

func get_grid_path(start: Vector2i, end: Vector2i) -> Array[Vector2i]:
    # Returns an optimized array of Vector2i grid coordinates.
    return astar_grid.get_id_path(start, end)

# puzzle_saver.gd
extends Node
class_name PuzzleSaver

# Saving Persistent Puzzle State
# Serializes object properties safely into the user:// directory.

func save_game(save_name: String = "puzzle_save.json") -> void:
    var save_dict := {}
    var save_nodes := get_tree().get_nodes_in_group("Persist")
    
    for node in save_nodes:
        save_dict[node.name] = {
            # Pattern: Manually split complex types (Vector2) for JSON.
            "pos_x": node.position.x,
            "pos_y": node.position.y,
            "state": node.get("puzzle_state") if "puzzle_state" in node else 0
        }
        
    var path := "user://" + save_name
    var file := FileAccess.open(path, FileAccess.WRITE)
    if file:
        file.store_line(JSON.stringify(save_dict))

extends Node
class_name PuzzleStateValidator

## Expert Puzzle Validation (Godot 4.6).
## Uses recursive dictionary comparisons for win conditions.

signal solved

@export var target_state: Dictionary = {}
var current_state: Dictionary = {}

func update_state(piece_id: String, state: Variant) -> void:
	current_state[piece_id] = state
	_check_win()

func _check_win() -> void:
	# Expert Pattern: Compare dictionaries directly
	if current_state.recursive_equal(target_state):
		solved.emit()
		print("Puzzle Solved!")

## [SKILL NOTICE]: Use 'Dictionary.recursive_equal()' for multi-layered 
## win conditions. It is significantly faster than manual nested loops.

extends Node
class_name PuzzleUndoManager

## Expert Undo/Redo (Godot 4.6).
## Leverages the built-in UndoRedo class for command tracking.

var history := UndoRedo.new()

func record_move(piece: Node2D, from: Vector2i, to: Vector2i) -> void:
	history.create_action("Move Piece")
	history.add_do_method(piece.move_to.bind(to))
	history.add_undo_method(piece.move_to.bind(from))
	history.commit_action()

func undo() -> void:
	if history.has_undo(): history.undo()

func redo() -> void:
	if history.has_redo(): history.redo()

## [SKILL NOTICE]: Do not build custom stacks. Use Godot's 'UndoRedo' 
## object to handle the Command pattern and memory limits automatically.

# puzzle_validator.gd
extends Node
class_name PuzzleValidator

# Array Reduction for Victory Conditions
# Validates completion using optimized functional reduction lambdas.

func check_all_resolved(objectives: Array) -> bool:
    # Pattern: Use Godot 4's functional reduction for concise win checking.
    var completed: int = objectives.reduce(
        func(count, next): return count + 1 if next.get("is_resolved") else count, 0
    )
    return completed == objectives.size()

# shuffle_bag.gd
extends Node
class_name ShuffleBag

# Shuffle Bag for Procedural Generation
# Generates non-repeating random values (e.g., Match-3 block types).

var _items: Array[Variant] = []
var _full_items: Array[Variant] = []

func initialize(items_to_shuffle: Array) -> void:
    _full_items = items_to_shuffle.duplicate()
    _refill_and_shuffle()

func _refill_and_shuffle() -> void:
    _items = _full_items.duplicate()
    _items.shuffle()

func get_next() -> Variant:
    if _items.is_empty():
        # Pattern: Reinitialize when empty to guarantee fair distribution.
        _refill_and_shuffle()
    return _items.pop_front()

# sleepy_block.gd
extends RigidBody2D
class_name SleepyBlock

# Interactive Physics Puzzle Sleep State
# Interfaces with low-level body state to force sleep on demand.

func _integrate_forces(state: PhysicsDirectBodyState2D) -> void:
    # Pattern: Optimize interactive puzzles by sleeping when movement is negligible.
    if state.get_linear_velocity().length() < 5.0 and state.get_angular_velocity() < 0.1:
        state.sleeping = true

# tile_animator.gd
extends Node
class_name TileAnimator

# Safe Tween Callbacks for Move Validation
# Uses First-Class Callables to securely chain animation logic.

func animate_tile_removal(node: Node2D, target_dict: Dictionary) -> void:
    var tween := get_tree().create_tween()
    tween.tween_property(node, "scale", Vector2.ZERO, 0.3).set_trans(Tween.TRANS_BACK).set_ease(Tween.EASE_IN)
    
    # Pattern: Use Callable.create for methods of built-in types.
    tween.tween_callback(Callable.create(target_dict, "clear"))
    tween.tween_callback(node.queue_free)