extends Node


@warning_ignore("unused_signal")
signal boss_initialized(hp: int)
@warning_ignore("unused_signal")
signal boss_hp_changed
@warning_ignore("unused_signal")
signal boss_defeated

signal score_changed

var score = 0 :
	set(value):
		score = value
		score_changed.emit()

var player_state := {
	"hp": null,
	"life": 4,
}


func _ready():
	var canvas_layer = CanvasLayer.new()
	canvas_layer.name = "ScreenTransition"
	
	var color_rect = ColorRect.new()
	color_rect.name = "ColorRect"
	color_rect.size = get_tree().current_scene.get_viewport_rect().size
	color_rect.color = Color(1,1,1,0)
	
	canvas_layer.add_child(color_rect)
	
	get_tree().root.add_child.call_deferred(canvas_layer)
	
	get_tree().root.add_child.call_deferred(preload("res://BackgroundColor.tscn").instantiate())


func fade_out_screen():
	var color_rect = get_tree().root.get_node("ScreenTransition/ColorRect")
	color_rect.color = Color(1,1,1,0)
	
	var tween = get_tree().create_tween()
	tween.tween_property(
		color_rect,
		"color",
		Color(1,1,1,1),
		0.3
	)
	
	return tween

func fade_in_screen():
	var color_rect = get_tree().root.get_node("ScreenTransition/ColorRect")
	color_rect.color = Color(1,1,1,1)
	
	var tween = get_tree().create_tween()
	tween.tween_property(
		color_rect,
		"color",
		Color(1,1,1,0),
		0.3
	)
	
	return tween


func transition_to_scene(path: String):
	var scene = load(path).instantiate()
	
	(func():
		var tween = Game.fade_out_screen()
		get_tree().current_scene.process_mode = Node.PROCESS_MODE_DISABLED
		await tween.finished
		
		get_tree().current_scene.free()
		get_tree().root.add_child(scene)
		get_tree().current_scene = scene
		
		Game.fade_in_screen()
	).call_deferred()

func transition_scene_with_door(door: Door):
		var scene = load(door.target_scene).instantiate()
		scene.starting_position = door.target_position
		scene.fade_in_from_door = true
		
		var tween = Game.fade_out_screen()
		get_tree().current_scene.process_mode = Node.PROCESS_MODE_DISABLED
		await tween.finished
		
		(func():
			get_tree().current_scene.free()
			get_tree().root.add_child(scene)
			get_tree().current_scene = scene
			
			Game.fade_in_screen()
		).call_deferred()


func hit_enemy(enemy: Enemy, projectile_position: Vector2):
	enemy.on_hit(projectile_position)