@tool
class_name EnhancedGridMap
extends GridMap

signal mesh_library_changed
signal grid_updated

@export var columns: int = 10: set = set_columns
@export var rows: int = 10: set = set_rows
@export var floors: int = 3: set = set_floors
@export var auto_generate: bool = false: set = set_auto_generate
@export var auto_randomize: bool = false # If true, randomizes grid on start

@export var normal_items: Array[int] = [0]
@export var non_walkable_items: Array[int] = [4]
@export var hover_item: int = 1
@export var start_item: int = -1
@export var end_item: int = -1
@export var immutable_items: Array[int] = [1, 2, 3, 4, 16] # Items that cannot be randomized/reset (Start, Safe, Finish, Wall, Safe Zone Wall)

var current_mesh_library: MeshLibrary
var grid_data: Array = [] # 3D array [floor][row][column]

# A* Pathfinding variables (per floor)
var astar_by_floor = {} # Dictionary of AStar2D instances per floor
var path = []


# Direction and movement systems
enum Direction {
	NORTHWEST, NORTH, NORTHEAST,
	WEST, CENTER, EAST,
	SOUTHWEST, SOUTH, SOUTHEAST
}

var diagonal_movement: bool = false


class NeighborInfo:
	var position: Vector2i
	var direction: Direction
	var is_walkable: bool
	
	func _init(pos: Vector2i, dir: Direction, walkable: bool):
		position = pos
		direction = dir
		is_walkable = walkable

func _ready():
	mesh_library_changed.connect(_on_mesh_library_changed)
	if not Engine.is_editor_hint():
		if auto_generate:
			generate_grid()
		if auto_randomize:
			# Safety check: Don't auto-randomize if game mode manages its own arena
			if not (ResourceLoader.exists("res://scripts/managers/lobby_manager.gd") \
				and get_node_or_null("/root/LobbyManager") \
				and (get_node("/root/LobbyManager").game_mode == "Stop n Go" \
				or get_node("/root/LobbyManager").game_mode == "Tekton Doors")):
				randomize_grid()
	validate_item_indices()

# Core grid management functions
func set_columns(value: int):
	columns = value
	if auto_generate:
		generate_grid()
	else:
		update_grid_data()

func set_rows(value: int):
	rows = value
	if auto_generate:
		generate_grid()
	else:
		update_grid_data()

func set_floors(value: int):
	floors = value
	if auto_generate:
		generate_grid()
	else:
		update_grid_data()

func set_auto_generate(value: bool):
	auto_generate = value
	if auto_generate:
		generate_grid()

# Item validation
func validate_item_indices():
	if not mesh_library:
		print("Warning: No MeshLibrary assigned to GridMap")
		return
	
	var item_list = mesh_library.get_item_list()
	var max_index = item_list.size() - 1
	
	normal_items = normal_items.filter(func(item): return item >= 0 and item <= max_index)
	hover_item = clamp(hover_item, 0, max_index)
	start_item = clamp(start_item, 0, max_index)
	end_item = clamp(end_item, 0, max_index)
	non_walkable_items = non_walkable_items.filter(func(item): return item >= 0 and item <= max_index)
	
	if normal_items.is_empty():
		normal_items = [0]
	if non_walkable_items.is_empty():
		non_walkable_items = [max_index]

# Grid generation and management
func generate_grid(floor_index: int = -1):
	if floor_index == -1:
		clear()
		# Generate Floor 0 using Modular Generator
		var map_gen = load("res://scripts/generators/modular_map_generator.gd")
		if map_gen:
			var generator = map_gen.new()
			# Pick random shape
			var rng = RandomNumberGenerator.new()
			rng.randomize()
			var shape = rng.randi() % 4 # 0-3 (Rect, Islands, Maze, Rooms)
			generator.generate_map(self , columns, rows, shape)
		else:
			generate_floor(0)

		# Generate upper floors (just Items, initially empty or randomized)
		for y in range(1, floors):
			# Just clear them initially or fill based on generator? 
			# Usually Floor 1 is items on top of Floor 0.
			# Let's clean them first.
			clear_floor(y)
			
	else:
		if floor_index == 0:
			var map_gen = load("res://scripts/generators/modular_map_generator.gd")
			if map_gen:
				var generator = map_gen.new()
				var rng = RandomNumberGenerator.new()
				rng.randomize()
				var shape = rng.randi() % 4
				generator.generate_map(self , columns, rows, shape)
		else:
			clear_floor(floor_index)
			generate_floor(floor_index)
	
	update_grid_data()
	initialize_astar()
	update_astar_costs()

	# After generating map, if we are auto-randomizing, we should randomize items (Floor 1) 
	# ONLY on valid Floor 0 tiles.
	if auto_randomize:
		randomize_grid(1) # Floor 1 items
	
	# Explicitly ensure Floor 0 is never randomized with items via standard randomize_grid
	# (randomize_grid(0) would overwrite the map with items)

func generate_floor(floor_index: int):
	# Fallback / Standard generation
	if not mesh_library:
		print("Error: No MeshLibrary assigned to GridMap")
		return
	
	validate_item_indices()
	
	current_mesh_library = mesh_library
	var item_list = mesh_library.get_item_list()
	
	if floor_index == 0:
		for x in range(columns):
			for z in range(rows):
				set_cell_item(Vector3i(x, floor_index, z), normal_items[0])
	else:
		# Upper floors start empty unless specified
		pass

# Grid operations
func clear_floor(floor_index: int):
	for x in range(columns):
		for z in range(rows):
			set_cell_item(Vector3i(x, floor_index, z), -1)
	update_grid_data()

func clear_grid(floor_index: int = -1):
	if floor_index == -1:
		clear()
	else:
		clear_floor(floor_index)
	update_grid_data()

# =============================================================================
# Data Serialization Helpers (For Networking)
# =============================================================================

func get_floor_data(floor_index: int) -> PackedInt32Array:
	# Returns a flat PackedInt32Array [x, z, item_id, ...] for the specified floor.
	var data = PackedInt32Array()
	# Use get_used_cells() as the source of truth from the GridMap itself
	for cell in get_used_cells():
		if cell.y == floor_index:
			data.append(cell.x)
			data.append(cell.z)
			data.append(get_cell_item(cell))
	return data

func set_floor_data(floor_index: int, data: PackedInt32Array):
	# Sets the floor items from a flat PackedInt32Array. Clears existing items on that floor first.
	clear_floor(floor_index)
	# Iterate by triplets [x, z, item]
	var count = data.size()
	if count % 3 != 0:
		print("[EnhancedGridMap] Error: Malformed grid data array (size %d not divisible by 3)" % count)
		return
		
	for i in range(0, count, 3):
		var x = data[i]
		var z = data[i + 1]
		var item = data[i + 2]
		
		# WALL-SAFETY CHECK: Skip if item is a tile (7-20) and Floor 0 is a wall
		if floor_index == 1 and item >= 7 and item <= 20:
			var f0 = get_cell_item(Vector3i(x, 0, z))
			if f0 != -1 and f0 in non_walkable_items:
				# Skip illegal placement from synced data
				continue
				
		set_cell_item(Vector3i(x, floor_index, z), item)
	
	update_grid_data()

func fill_grid(item_index: int, floor_index: int = -1):
	if not mesh_library:
		print("No MeshLibrary assigned to GridMap")
		return
	
	if item_index < 0 or item_index >= mesh_library.get_item_list().size():
		print("Invalid item index")
		return
	
	if floor_index == -1:
		for y in range(floors):
			fill_floor(item_index, y)
	else:
		if floor_index >= 0 and floor_index < floors:
			fill_floor(item_index, floor_index)
		else:
			print("Invalid floor index")
	
	update_grid_data()
	initialize_astar()
	update_astar_costs()

func fill_floor(item_index: int, floor_index: int):
	for x in range(columns):
		for z in range(rows):
			var cell_pos = Vector3i(x, floor_index, z)
			var current_orientation = get_cell_item_orientation(cell_pos)
			set_cell_item(cell_pos, item_index, current_orientation)

# Randomization functions
func randomize_grid(floor_index: int = -1, custom_rng_callable: Callable = Callable()):
	if floor_index == -1:
		# Default auto-randomize behavior:
		# Preserve Floor 0 (Ground)
		# Shuffle Floor 1 (Objects/Items)
		shuffle_floor_objects(1)
	else:
		randomize_floor(floor_index, custom_rng_callable)
	
	update_grid_data()
	initialize_astar()
	update_astar_costs()

func randomize_floor(floor_index: int, custom_rng_callable: Callable = Callable()):
	if not mesh_library:
		print("Error: No MeshLibrary assigned to GridMap")
		return
	
	
	validate_item_indices()
	
	var rng = RandomNumberGenerator.new()
	rng.randomize()
	
	for x in range(columns):
		for z in range(rows):
			# Check if current item on this floor is immutable
			var current_item_on_floor = get_cell_item(Vector3i(x, floor_index, z))
			if current_item_on_floor in immutable_items:
				continue

			# IMPORTANT: Only place items if Floor 0 has a valid ground tile (Walkable, Safe Zone, etc)
			var floor_0_item = get_cell_item(Vector3i(x, 0, z))
			var is_ground = (floor_0_item != -1 and not floor_0_item in non_walkable_items)
			
			if not is_ground:
				set_cell_item(Vector3i(x, floor_index, z), -1) # Clear item if no ground
				continue

			# Use custom callable if provided, otherwise default to ScarcityController or internal logic
			var item_index = -1
			
			if custom_rng_callable.is_valid():
				item_index = custom_rng_callable.call()
			elif ResourceLoader.exists("res://scripts/controllers/scarcity_controller.gd"):
				# Use ScarcityController by default if available (Project Specific)
				# We use call() to avoid direct dependency if class_name isn't fully loaded in tool mode sometimes,
				# but ScarcityController is a class_name so we can try valid access.
				# To be safe in a tool script, we can check dynamic usage or just use the static method directly if known.
				# Since this is "tekton-enet" specific codebase, we can directly use it.
				item_index = ScarcityController.get_random_tile_id()
			else:
				# Fallback default behavior
				var random_value = rng.randi() % 100
				if random_value < 80:
					item_index = normal_items[rng.randi() % normal_items.size()]
				else:
					item_index = non_walkable_items[rng.randi() % non_walkable_items.size()]
			
			set_cell_item(Vector3i(x, floor_index, z), item_index)

func randomize_grid_custom(randomize_states: Array, floor_index: int = -1):
	if not mesh_library:
		print("Error: No MeshLibrary assigned to GridMap")
		return

	if floor_index == -1:
		for y in range(floors):
			randomize_floor_custom(randomize_states, y)
	else:
		if floor_index >= 0 and floor_index < floors:
			randomize_floor_custom(randomize_states, floor_index)
		else:
			print("Invalid floor index")

	update_grid_data()
	initialize_astar()
	update_astar_costs()

func randomize_floor_custom(randomize_states: Array, floor_index: int):
	if randomize_states.is_empty():
		print("No randomize states provided")
		return

	var rng = RandomNumberGenerator.new()
	rng.randomize()

	for x in range(columns):
		for z in range(rows):
			var cell_pos = Vector3i(x, floor_index, z)
			var random_value = rng.randf() * 100
			var accumulated_percentage = 0
			var selected_state = null

			for state in randomize_states:
				if state.include_in_randomize:
					accumulated_percentage += state.randomize_percentage
					if random_value <= accumulated_percentage:
						selected_state = state
						break

			var current_orientation = get_cell_item_orientation(cell_pos)
			
			if selected_state:
				set_cell_item(cell_pos, selected_state.id, current_orientation)
			else:
				var fallback_state = null
				for state in randomize_states:
					if state.include_in_randomize:
						fallback_state = state
						break
				
				if fallback_state:
					set_cell_item(cell_pos, fallback_state.id, current_orientation)
				else:
					set_cell_item(cell_pos, normal_items[0], current_orientation)


func shuffle_floor_objects(floor_idx: int):
	if not mesh_library:
		print("Error: No MeshLibrary assigned to GridMap")
		return

	# 1. Collect all existing items and their positions on this floor
	var positions: Array[Vector3i] = []
	var items: Array[int] = []
	
	for x in range(columns):
		for z in range(rows):
			var cell_pos = Vector3i(x, floor_idx, z)
			var item = get_cell_item(cell_pos)
			
			if item != -1:
				positions.append(cell_pos)
				items.append(item)
	
	if positions.is_empty():
		return

	# 2. Shuffle the items list
	var rng = RandomNumberGenerator.new()
	rng.randomize()
	items.shuffle()
	
	# 3. Reassign items to the existing positions
	# This preserves the location of "something exists here" (layout)
	# but randomizes "what exists here" (type)
	for i in range(positions.size()):
		var pos = positions[i]
		var new_item = items[i]
		var orientation = get_cell_item_orientation(pos) # Keep orientation? Or reset? Keeping seems safer.
		set_cell_item(pos, new_item, orientation)
		
	print("Shuffled %d items on Floor %d" % [items.size(), floor_idx])


#func get_neighbors(current_pos: Vector2i, floor_index: int) -> Array[NeighborInfo]:
	#var neighbors: Array[NeighborInfo] = []
	#
	#var directions = {
		#Direction.NORTHWEST: Vector2i(-1, -1),
		#Direction.NORTH: Vector2i(0, -1),
		#Direction.NORTHEAST: Vector2i(1, -1),
		#Direction.WEST: Vector2i(-1, 0),
		#Direction.EAST: Vector2i(1, 0),
		#Direction.SOUTHWEST: Vector2i(-1, 1),
		#Direction.SOUTH: Vector2i(0, 1),
		#Direction.SOUTHEAST: Vector2i(1, 1)
	#}
	#
	#for dir in directions:
		#var offset = directions[dir]
		#var neighbor_pos = current_pos + offset
		#
		#if is_position_valid(neighbor_pos):
			#var is_walkable = is_cell_walkable(neighbor_pos, floor_index)
			#
			## Check for obstacles - specifically for orthogonal movement
			#if not is_diagonal_direction(dir) and is_blocked_by_obstacle(current_pos, neighbor_pos, 3):
				#is_walkable = false
			#
			## Special handling for diagonal movement
			#if is_diagonal_direction(dir):
				#var adjacent1: Vector2i
				#var adjacent2: Vector2i
				#
				#match dir:
					#Direction.NORTHWEST:
						#adjacent1 = current_pos + Vector2i(-1, 0) # West
						#adjacent2 = current_pos + Vector2i(0, -1) # North
					#Direction.NORTHEAST:
						#adjacent1 = current_pos + Vector2i(1, 0)  # East
						#adjacent2 = current_pos + Vector2i(0, -1) # North
					#Direction.SOUTHWEST:
						#adjacent1 = current_pos + Vector2i(-1, 0) # West
						#adjacent2 = current_pos + Vector2i(0, 1)  # South
					#Direction.SOUTHEAST:
						#adjacent1 = current_pos + Vector2i(1, 0)  # East
						#adjacent2 = current_pos + Vector2i(0, 1)  # South
				#
				## For diagonal movement, both adjacent cells must be walkable
				## AND the movements to those adjacent cells must not be blocked
				#is_walkable = is_walkable and \
						   #is_position_valid(adjacent1) and is_cell_walkable(adjacent1, floor_index) and \
						   #is_position_valid(adjacent2) and is_cell_walkable(adjacent2, floor_index) and \
						   #not is_blocked_by_obstacle(current_pos, adjacent1, 3) and \
						   #not is_blocked_by_obstacle(current_pos, adjacent2, 3)
			#
			#if diagonal_movement or not is_diagonal_direction(dir):
				#neighbors.append(NeighborInfo.new(neighbor_pos, dir, is_walkable))
	#
	#return neighbors

func get_neighbors(current_pos: Vector2i, floor_index: int) -> Array[NeighborInfo]:
	var neighbors: Array[NeighborInfo] = []
	
	# Four orthogonal directions
	var directions = {
		Direction.NORTH: Vector2i(0, -1),
		Direction.EAST: Vector2i(1, 0),
		Direction.SOUTH: Vector2i(0, 1),
		Direction.WEST: Vector2i(-1, 0)
	}
	
	# Add diagonal directions if enabled
	if diagonal_movement:
		directions[Direction.NORTHWEST] = Vector2i(-1, -1)
		directions[Direction.NORTHEAST] = Vector2i(1, -1)
		directions[Direction.SOUTHWEST] = Vector2i(-1, 1)
		directions[Direction.SOUTHEAST] = Vector2i(1, 1)
	
	for dir in directions:
		var offset = directions[dir]
		var neighbor_pos = current_pos + offset
		
		if is_position_valid(neighbor_pos):
			var is_walkable = is_cell_walkable(neighbor_pos, floor_index)
			
			# Check if movement to this neighbor is blocked by obstacles
			# if not is_diagonal_direction(dir) and is_movement_blocked(current_pos, neighbor_pos, floor_index):
			# 	is_walkable = false
			
			if is_diagonal_direction(dir):
				# For diagonal movement, check if both orthogonal paths are blocked
				var mid1 = Vector2i(neighbor_pos.x, current_pos.y)
				var mid2 = Vector2i(current_pos.x, neighbor_pos.y)
				

			if is_walkable:
				neighbors.append(NeighborInfo.new(neighbor_pos, dir, is_walkable))
	
	return neighbors

# Helper functions for neighbor checking
func is_diagonal_direction(direction: Direction) -> bool:
	return direction in [Direction.NORTHWEST, Direction.NORTHEAST,
						Direction.SOUTHWEST, Direction.SOUTHEAST]

func is_position_valid(pos: Vector2i) -> bool:
	return pos.x >= 0 and pos.x < columns and pos.y >= 0 and pos.y < rows

func is_cell_walkable(pos: Vector2i, floor_index: int) -> bool:
	var cell_item = get_cell_item(Vector3i(pos.x, floor_index, pos.y))
	return cell_item != -1 and not (cell_item in non_walkable_items)

# Improved A* pathfinding
func initialize_astar():
	astar_by_floor.clear()
	for y in range(floors):
		var astar = AStar2D.new()
		
		# Add all points
		for x in range(columns):
			for z in range(rows):
				var point_id = z * columns + x
				astar.add_point(point_id, Vector2(x, z))
		
		# Connect points based on neighbors
		for x in range(columns):
			for z in range(rows):
				var current_pos = Vector2i(x, z)
				var current_point_id = z * columns + x
				
				if not is_cell_walkable(current_pos, y):
					continue
				
				var neighbors = get_neighbors(current_pos, y)
				for neighbor in neighbors:
					if neighbor.is_walkable:
						var neighbor_id = neighbor.position.y * columns + neighbor.position.x
						
						if not astar.are_points_connected(current_point_id, neighbor_id):
							var weight = 1.0 if not is_diagonal_direction(neighbor.direction) else 1.4142
							
							# Check if movement is allowed by obstacles
							if true: # Obstacle check removed
								astar.connect_points(current_point_id, neighbor_id, true)
								astar.set_point_weight_scale(neighbor_id, weight)
		
		astar_by_floor[y] = astar
	
	update_astar_costs()

func find_path(start: Vector2, end: Vector2, floor_index: int = 0, clear_path_visual: bool = true, visualize: bool = true) -> Array:
	var astar = astar_by_floor.get(floor_index)
	if not astar:
		return []
	
	var start_point = start.y * columns + start.x
	var end_point = end.y * columns + end.x
	
	if not is_position_valid(Vector2i(int(start.x), int(start.y))) or not is_position_valid(Vector2i(int(end.x), int(end.y))):
		return []
		
	if not astar.has_point(start_point) or not astar.has_point(end_point):
		return []
		
	path = astar.get_point_path(start_point, end_point)
	
	# TEMPORARY PATH VISUALIZATION - Moved to Layer 2 (Overlay) to protect Floor 0 and Floor 1
	if visualize:
		if clear_path_visual:
			clear_path_visualization()

		# Always use Layer 2 for these temporary markers
		if start_item >= 0:
			set_cell_item(Vector3i(start.x, 2, start.y), start_item)
		if end_item >= 0:
			set_cell_item(Vector3i(end.x, 2, end.y), end_item)
		for point in path:
			if Vector2(point.x, point.y) != start and Vector2(point.x, point.y) != end:
				set_cell_item(Vector3i(point.x, 2, point.y), hover_item)
	
	return path

# Path visualization - Standardized to Layer 2
func clear_path_visualization(unused_floor_idx: int = 0):
	# We strictly clear Layer 2 (Overlay) and reset to -1 (Empty)
	# This ensures we never overwrite Layer 0 (Floor) or Layer 1 (Items)
	for x in range(columns):
		for z in range(rows):
			var cell_item = get_cell_item(Vector3i(x, 2, z))
			# Protect Safe Zone (ID 2) from being cleared by path visualization
			if cell_item == 2:
				continue
				
			if cell_item == hover_item or cell_item == start_item or cell_item == end_item:
				set_cell_item(Vector3i(x, 2, z), -1)

# Cost calculation and updates
func get_cell_cost(x: int, z: int, floor_index: int = 0) -> float:
	var cell_item = get_cell_item(Vector3i(x, floor_index, z))
	
	# Block -1 (Void) and Non-Walkable Items
	if cell_item == -1 or cell_item in non_walkable_items:
		return INF
	elif cell_item == hover_item:
		return 0.5
	elif cell_item == start_item or cell_item == end_item:
		return 0.0
	return 1.0

func update_astar_costs():
	for floor_index in range(floors):
		var astar = astar_by_floor.get(floor_index)
		if astar:
			for x in range(columns):
				for z in range(rows):
					var point_id = z * columns + x
					var cost = get_cell_cost(x, z, floor_index)
					if cost == INF:
						astar.set_point_disabled(point_id, true)
					else:
						astar.set_point_disabled(point_id, false)
						astar.set_point_weight_scale(point_id, cost)

# Grid data management
func update_grid_data():
	grid_data.clear()
	for y in range(floors):
		var floor_data = []
		for z in range(rows):
			var row = []
			for x in range(columns):
				row.append(get_cell_item(Vector3i(x, y, z)))
			floor_data.append(row)
		grid_data.append(floor_data)
	emit_signal("grid_updated")

# Orientation helper
func get_cell_orientation(pos: Vector3i) -> int:
	return get_cell_item_orientation(pos)

# Cell rotation handling
func get_cell_rotation(position: Vector3i) -> int:
	return get_cell_item_orientation(position)

func set_cell_rotation(position: Vector3i, mode: int):
	var item = get_cell_item(position)
	if item != -1:
		set_cell_item(position, item, mode)

# Mesh library handling
func _on_mesh_library_changed():
	validate_item_indices()
	if auto_generate:
		generate_grid()
		_update_cell_option_buttons()

func _update_cell_option_buttons():
	if not mesh_library:
		return

	var item_list = mesh_library.get_item_list()

	for x in range(columns):
		for z in range(rows):
			var position = Vector3i(x, 0, z)
			var cell_item = get_cell_item(position)
			if cell_item != -1 and cell_item < item_list.size():
				set_cell_item(position, cell_item)
			else:
				set_cell_item(position, 0)

func _set(property, value):
	if property.begins_with("data/cells") and Engine.is_editor_hint():
		call_deferred("_emit_grid_updated")
	return false

func _emit_grid_updated():
	emit_signal("grid_updated")

# Toggle diagonal movement
func set_diagonal_movement(enable: bool):
	diagonal_movement = enable
	initialize_astar()