extends Node2D

signal tile_selected(tile: Node2D)

@export var tile_type: int = 0 : set = _set_tile_type
var grid_position: Vector2i
var is_selected: bool = false : set = _set_selected
var is_highlighted: bool = false : set = _set_highlighted
var original_scale: Vector2 = Vector2.ONE  # Store the original scale for the board

@onready var sprite: Sprite2D = $Sprite2D

# Target size for each tile to fit in the 54x54 grid cells
const TILE_SIZE = 48  # Slightly smaller than 54 to leave some padding

# All available gem textures
var all_gem_textures = [
	preload("res://assets/sprites/gems/bg_19.png"),    # 0 - Blue gem
	preload("res://assets/sprites/gems/dg_19.png"),    # 1 - Dark gem
	preload("res://assets/sprites/gems/gg_19.png"),    # 2 - Green gem
	preload("res://assets/sprites/gems/mg_19.png"),    # 3 - Magenta gem
	preload("res://assets/sprites/gems/rg_19.png"),    # 4 - Red gem
	preload("res://assets/sprites/gems/yg_19.png"),    # 5 - Yellow gem
	preload("res://assets/sprites/gems/pg_19.png"),    # 6 - Purple gem
	preload("res://assets/sprites/gems/sg_19.png"),    # 7 - Silver gem
]

# Static variable to store the current gem pool for all tiles
static var current_gem_pool = [0, 1, 2, 3, 4]  # Start with first 5 gems

# Currently active gem types (indices into all_gem_textures)
var active_gem_types = []  # Will be set from current_gem_pool

func _set_tile_type(value: int) -> void:
	tile_type = value
	# Fixed: Add sprite null check to prevent crashes during initialization
	if not sprite:
		return
	if value >= 0 and value < active_gem_types.size():
		var texture_index = active_gem_types[value]
		sprite.texture = all_gem_textures[texture_index]
		# print("Debug: Set texture_index ", texture_index, " for tile_type ", value)
		_scale_sprite_to_fit()
	else:
		DebugManager.log_error("Invalid tile type: " + str(value) + ". Available types: 0-" + str(active_gem_types.size() - 1), "Match3")

func _scale_sprite_to_fit() -> void:
	# Fixed: Add additional null checks
	if sprite and sprite.texture:
		var texture_size = sprite.texture.get_size()
		var max_dimension = max(texture_size.x, texture_size.y)
		var scale_factor = TILE_SIZE / max_dimension
		original_scale = Vector2(scale_factor, scale_factor)
		sprite.scale = original_scale
		DebugManager.log_debug("Set original scale to %s for tile (%d,%d)" % [original_scale, grid_position.x, grid_position.y], "Match3")

# Gem pool management functions
static func set_active_gem_pool(gem_indices: Array) -> void:
	# Update static gem pool for new tiles
	current_gem_pool = gem_indices.duplicate()

	# Update all existing tile instances to use new gem pool
	var scene_tree = Engine.get_main_loop() as SceneTree
	if scene_tree:
		var tiles = scene_tree.get_nodes_in_group("tiles")
		for tile in tiles:
			if tile.has_method("_update_active_gems"):
				tile._update_active_gems(gem_indices)

func _update_active_gems(gem_indices: Array) -> void:
	active_gem_types = gem_indices.duplicate()
	# Re-validate current tile type
	if tile_type >= active_gem_types.size():
		# Generate a new random tile type within valid range
		tile_type = randi() % active_gem_types.size()
	_set_tile_type(tile_type)

static func get_active_gem_count() -> int:
	# Get from any tile instance or default
	var scene_tree = Engine.get_main_loop() as SceneTree
	if scene_tree:
		var tiles = scene_tree.get_nodes_in_group("tiles")
		if tiles.size() > 0:
			return tiles[0].active_gem_types.size()
	return 5  # Default

static func add_gem_to_pool(gem_index: int) -> void:
	var scene_tree = Engine.get_main_loop() as SceneTree
	if scene_tree:
		var tiles = scene_tree.get_nodes_in_group("tiles")
		for tile in tiles:
			if tile.has_method("_add_gem_type"):
				tile._add_gem_type(gem_index)

func _add_gem_type(gem_index: int) -> void:
	if gem_index >= 0 and gem_index < all_gem_textures.size():
		if not active_gem_types.has(gem_index):
			active_gem_types.append(gem_index)

static func remove_gem_from_pool(gem_index: int) -> void:
	var scene_tree = Engine.get_main_loop() as SceneTree
	if scene_tree:
		var tiles = scene_tree.get_nodes_in_group("tiles")
		for tile in tiles:
			if tile.has_method("_remove_gem_type"):
				tile._remove_gem_type(gem_index)

func _remove_gem_type(gem_index: int) -> void:
	var type_index = active_gem_types.find(gem_index)
	if type_index != -1 and active_gem_types.size() > 2:  # Keep at least 2 gem types
		active_gem_types.erase(gem_index)
		# Update tiles that were using removed type
		if tile_type >= active_gem_types.size():
			tile_type = 0
			_set_tile_type(tile_type)

func _set_selected(value: bool) -> void:
	var old_value = is_selected
	is_selected = value
	DebugManager.log_debug("Tile (%d,%d) selection changed: %s -> %s" % [grid_position.x, grid_position.y, old_value, value], "Match3")
	_update_visual_feedback()

func _set_highlighted(value: bool) -> void:
	var old_value = is_highlighted
	is_highlighted = value
	DebugManager.log_debug("Tile (%d,%d) highlight changed: %s -> %s" % [grid_position.x, grid_position.y, old_value, value], "Match3")
	_update_visual_feedback()

func _update_visual_feedback() -> void:
	if not sprite:
		return

	# Determine target values based on priority: selected > highlighted > normal
	var target_modulate: Color
	var target_scale: Vector2
	var scale_multiplier: float

	if is_selected:
		# Selected: bright and 20% larger than original board size
		target_modulate = Color(1.2, 1.2, 1.2, 1.0)
		scale_multiplier = 1.2
		DebugManager.log_debug("SELECTING tile (%d,%d): target scale %.2fx, current scale %s" % [grid_position.x, grid_position.y, scale_multiplier, sprite.scale], "Match3")
	elif is_highlighted:
		# Highlighted: subtle glow and 10% larger than original board size
		target_modulate = Color(1.1, 1.1, 1.1, 1.0)
		scale_multiplier = 1.1
		DebugManager.log_debug("HIGHLIGHTING tile (%d,%d): target scale %.2fx, current scale %s" % [grid_position.x, grid_position.y, scale_multiplier, sprite.scale], "Match3")
	else:
		# Normal state: white and original board size
		target_modulate = Color.WHITE
		scale_multiplier = 1.0
		DebugManager.log_debug("NORMALIZING tile (%d,%d): target scale %.2fx, current scale %s" % [grid_position.x, grid_position.y, scale_multiplier, sprite.scale], "Match3")

	# Calculate target scale relative to original board scale
	target_scale = original_scale * scale_multiplier

	# Apply modulate immediately
	sprite.modulate = target_modulate

	# Only animate scale if it's actually changing
	if sprite.scale != target_scale:
		DebugManager.log_debug("Animating scale from %s to %s for tile (%d,%d)" % [sprite.scale, target_scale, grid_position.x, grid_position.y], "Match3")

		var tween = create_tween()
		tween.tween_property(sprite, "scale", target_scale, 0.15)

		# Add completion callback for debugging
		tween.tween_callback(_on_scale_animation_completed.bind(target_scale))
	else:
		DebugManager.log_debug("No scale change needed for tile (%d,%d)" % [grid_position.x, grid_position.y], "Match3")

func _on_scale_animation_completed(expected_scale: Vector2) -> void:
	DebugManager.log_debug("Scale animation completed for tile (%d,%d): expected %s, actual %s" % [grid_position.x, grid_position.y, expected_scale, sprite.scale], "Match3")

func force_reset_visual_state() -> void:
	# Force reset all visual states - debug function
	is_selected = false
	is_highlighted = false
	if sprite:
		sprite.modulate = Color.WHITE
		sprite.scale = original_scale  # Reset to original board scale, not 1.0
	DebugManager.log_debug("Forced visual reset on tile (%d,%d) to original scale %s" % [grid_position.x, grid_position.y, original_scale], "Match3")

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	add_to_group("tiles")  # Add to group for gem pool management
	# Initialize with current static gem pool
	active_gem_types = current_gem_pool.duplicate()
	_set_tile_type(tile_type)