class_name Match3SaveManager
extends RefCounted

## Save/Load manager for Match3 gameplay state
##
## Handles serialization and deserialization of Match3 game state.
## Converts game objects to data structures for storage and restoration.
##
## Usage:
##   # Save current state
##   var grid_data = Match3SaveManager.serialize_grid_state(game_grid, grid_size)
##
##   # Restore previous state
##   var success = Match3SaveManager.deserialize_grid_state(grid_data, game_grid, grid_size)


static func serialize_grid_state(grid: Array, grid_size: Vector2i) -> Array:
	## Convert the current game grid to a serializable 2D array of tile types.
	##
	## Extracts the tile_type property from each tile node and creates a 2D array
	## that can be saved to disk. Invalid or missing tiles are represented as -1.
	##
	## Args:
	##   grid: The current game grid (2D array of tile nodes)
	##   grid_size: Dimensions of the grid to serialize
	##
	## Returns:
	##   Array: 2D array where each element is either a tile type (int) or -1 for empty
	var serialized_grid = []
	var valid_tiles = 0
	var null_tiles = 0

	for y in range(grid_size.y):
		var row = []
		for x in range(grid_size.x):
			if y < grid.size() and x < grid[y].size() and grid[y][x]:
				row.append(grid[y][x].tile_type)
				valid_tiles += 1
			else:
				row.append(-1)  # Invalid/empty tile
				null_tiles += 1
		serialized_grid.append(row)

	DebugManager.log_info(
		(
			"Serialized grid state: %dx%d grid, %d valid tiles, %d null tiles"
			% [grid_size.x, grid_size.y, valid_tiles, null_tiles]
		),
		"Match3"
	)
	return serialized_grid


static func get_active_gem_types_from_grid(grid: Array, tile_types: int) -> Array:
	# Get active gem types from the first available tile
	if grid.size() > 0 and grid[0].size() > 0 and grid[0][0]:
		return grid[0][0].active_gem_types.duplicate()

	# Fallback to default
	var default_types = []
	for i in range(tile_types):
		default_types.append(i)
	return default_types


static func save_game_state(grid: Array, grid_size: Vector2i, tile_types: int):
	# Save complete game state
	var grid_layout = serialize_grid_state(grid, grid_size)
	var active_gems = get_active_gem_types_from_grid(grid, tile_types)

	DebugManager.log_info(
		(
			"Saving match3 state: size(%d,%d), %d tile types, %d active gems"
			% [grid_size.x, grid_size.y, tile_types, active_gems.size()]
		),
		"Match3"
	)

	SaveManager.save_grid_state(grid_size, tile_types, active_gems, grid_layout)


static func restore_grid_from_layout(
	match3_node: Node2D,
	grid_layout: Array,
	active_gems: Array[int],
	grid_size: Vector2i,
	tile_scene: PackedScene,
	grid_offset: Vector2,
	tile_size: float,
	tile_types: int
) -> Array[Array]:
	# Clear ALL existing tile children
	var all_tile_children = []
	for child in match3_node.get_children():
		if child.has_method("get_script") and child.get_script():
			var script_path = child.get_script().resource_path
			if script_path == "res://scenes/game/gameplays/tile.gd":
				all_tile_children.append(child)

	# Remove all found tile children
	for child in all_tile_children:
		child.queue_free()

	# Wait for nodes to be freed
	await match3_node.get_tree().process_frame

	# Create new grid
	var new_grid: Array[Array] = []
	for y in range(grid_size.y):
		new_grid.append(Array([]))
		for x in range(grid_size.x):
			var tile = tile_scene.instantiate()
			var tile_position = grid_offset + Vector2(x, y) * tile_size
			tile.position = tile_position
			tile.grid_position = Vector2i(x, y)

			match3_node.add_child(tile)

			# Configure Area2D
			tile.monitoring = true
			tile.monitorable = true
			tile.input_pickable = true

			tile.set_tile_size(tile_size)
			tile.set_active_gem_types(active_gems)

			# Set the saved tile type
			var saved_tile_type = grid_layout[y][x]
			if saved_tile_type >= 0 and saved_tile_type < tile_types:
				tile.tile_type = saved_tile_type
			else:
				tile.tile_type = randi() % tile_types

			# Connect tile signals
			if tile.has_signal("tile_selected") and match3_node.has_method("_on_tile_selected"):
				tile.tile_selected.connect(match3_node._on_tile_selected)
			if tile.has_signal("tile_hovered") and match3_node.has_method("_on_tile_hovered"):
				tile.tile_hovered.connect(match3_node._on_tile_hovered)
				tile.tile_unhovered.connect(match3_node._on_tile_unhovered)

			new_grid[y].append(tile)

	return new_grid