extends Node2D

@onready var tilemap = get_node("../Map/TileMapLayer")
@onready var map_config = preload("res://resources/map_generator_resource.tres")

var occupied_tiles = {}
var max_x : int
var max_y : int

var dirs = {"move_right": Vector2.RIGHT,
			"move_left": Vector2.LEFT,
			"move_up": Vector2.UP,
			"move_down": Vector2.DOWN}
var towers : Dictionary = {
	"place_warlock": {
		"scene": preload("res://scenes/warlock.tscn"),
		"cost": 10
	},
	"place_wyvern": {
		"scene": preload("res://scenes/wyvern.tscn"),
		"cost": 15
	}
}

func _ready():
	max_x = map_config.grid_width * map_config.tile_size
	max_y = map_config.grid_height * map_config.tile_size
	position = position.snapped(Vector2.ONE * map_config.tile_size)
	position += Vector2.ONE * map_config.tile_size / 2

func _unhandled_input(event):
	for dir in dirs.keys():
		if event.is_action_pressed(dir):
			handle_move(dirs[dir])
			return
	for tower in towers.keys():
		if event.is_action_pressed(tower):
			handle_tower(towers[tower])
			return

func handle_tower(tower):
	var tower_cost = tower["cost"]
	if is_valid_placement_tile() && GameData.get_life() >= tower_cost:
		var tmp = tower["scene"].instantiate()
		var path = get_tree().get_root().get_node("Main/Defenders")
		path.add_child(tmp)
		tmp.global_position = position
		occupy_tile(position)
		GameData.subtract_life(tower_cost)

func handle_move(dir):
	position += dir * map_config.tile_size
	position.x = max(position.x, map_config.tile_size / 2)
	position.y = max(position.y, map_config.tile_size / 2)
	position.x = min(position.x, max_x - (map_config.tile_size / 2))
	position.y = min(position.y, max_y - (map_config.tile_size / 2))

func is_valid_placement_tile():
	var tile_coords = tilemap.get_cell_atlas_coords(tilemap.local_to_map(global_position))
	return (tile_coords == (Vector2i(-1, -1))) && (!is_tile_occupied(position))
	
func is_tile_occupied(tile_position):
	return occupied_tiles.has(tile_position)

func occupy_tile(tile_position):
	occupied_tiles[tile_position] = true

func free_tile(tile_position):
	occupied_tiles.erase(tile_position)