class_name Enemy
extends CharacterBody2D

const ball_scene = preload("res://scenes/ball.tscn")
const ball_name = "Ball"
const y_spawn_offset = -8
signal hit_ball
var speed = 80
var next_destination
var collide_with_ball = false
var hit_ball_animation_finished = false
var ball_aims_to_bottom = false
@onready var tile_map: TileMap = get_parent()
@onready var animation_player = $AnimationPlayer
@onready var sprite = $Sprite2D

func _ready():
	var spawn_cell = tile_map.get_top_spawn_cell()
	position = tile_map.map_to_local(spawn_cell) + Vector2(0, y_spawn_offset)
	animation_player.animation_finished.connect(_on_hit_ball_animation_finished)

func move_to(destination):
	var delta = get_physics_process_delta_time()
	position = position.move_toward(destination, delta * speed)

func throw_ball():
	var ball = ball_scene.instantiate()
	ball.name = ball_name
	ball.position = position
	ball.notify_enemy.connect(_on_notify_enemy)
	tile_map.add_child(ball)
	hit_ball.emit()

func return_ball():
	hit_ball.emit()

func flip_sprite(destination):
	sprite.flip_h = position.x > destination.x

func play_hit_ball_animation():
	hit_ball_animation_finished = false
	animation_player.speed_scale = 0.8
	animation_player.play("hit_ball")
	animation_player.speed_scale = 1

func play_idle_animation():
	animation_player.play("idle")

func play_walk_animation():
	animation_player.play("walk")

func _on_hit_ball_animation_finished(_anim_name):
	hit_ball_animation_finished = true

func _on_notify_enemy(ball_target: Vector2i):
	if tile_map.is_in_bottom_area(ball_target):
		ball_aims_to_bottom = true
	else:
		ball_aims_to_bottom = false
		# TODO: add to ball_target an offset depending from where the enemy come from
		next_destination = tile_map.map_to_local(ball_target)

func _on_area_2d_body_entered(_body):
	collide_with_ball = true

func _on_area_2d_body_exited(_body):
	collide_with_ball = false

func ball_in_game() -> bool:
	return tile_map.has_node(ball_name)

# Debug functions
func reset_tile(destination):
	destination.y -= y_spawn_offset
	var cell = tile_map.local_to_map(destination)
	tile_map.set_cell(0, cell, 0, Vector2i(0, 0), 0)