extends CanvasLayer

@export var config: SceneConfig

@export_group("Transition Timings")
@export var fade_in_duration: float = 0.5
@export var black_screen_duration: float = 1.0
@export var fade_out_duration: float = 0.5
@export var logo_fade_in_duration: float = 0.3
@export var logo_fade_out_duration: float = 0.3

@export_group("Cozy Animation")
@export var sway_speed: float = 2.5       # Velocità dell'oscillazione (più alto = più veloce)
@export var max_sway_angle: float = 6.0   # Gradi massimi di inclinazione a destra/sinistra
@export var pulse_speed: float = 2.0      # Velocità del "respiro"
@export var pulse_amount: float = 0.015    # Quanto si ingrandisce/rimpicciolisce il logo

@export_group("Shader Parameters")
@export var base_color: Color = Color.BLACK
@export var shape_tiling: float = 16.0
@export var shape_rotation: float = 0.0
@export var shape_scroll: Vector2 = Vector2.ZERO
@export var shape_feathering: float = 0.05
@export var shape_treshold: float = 1.0
@export var width: float = 0.5

@onready var color_rect = $ColorRect
@onready var loading_screen = $LoadingScreen
@onready var logo = $LoadingScreen/Logo

const SHADER_PATH := "res://core/transition.gdshader"
var transaction_material: ShaderMaterial

var time_passed: float = 0.0
var initial_scale: Vector2 = Vector2.ONE
var scale_captured: bool = false

func _ready() -> void:
	_build_material()
	_update_resolution()
	get_viewport().size_changed.connect(_update_resolution)
	_set_factor(0.0)
	
	color_rect.z_index = 0
	loading_screen.z_index = 1
	
	color_rect.visible = false
	loading_screen.visible = false
	loading_screen.modulate.a = 0.0

func _process(delta: float) -> void:
	if loading_screen.visible and logo and logo.visible:
		# Cattura la scala originale (0.22) impostata nell'editor alla prima attivazione
		if not scale_captured:
			initial_scale = logo.scale
			scale_captured = true
			
		time_passed += delta
		
		# 1. EFFETTO DONDOLIO (Usa il seno per oscillare morbidamente)
		var target_rotation = sin(time_passed * sway_speed) * deg_to_rad(max_sway_angle)
		logo.rotation = target_rotation
		
		# 2. EFFETTO RESPIRO (Modifica leggermente lo scale partendo da quello base)
		var pulse = sin(time_passed * pulse_speed) * pulse_amount
		logo.scale = initial_scale + Vector2(pulse, pulse)
	else:
		# Reset del timer quando la schermata si chiude per ripartire da zero la prossima volta
		time_passed = 0.0

func _build_material() -> void:
	transaction_material = ShaderMaterial.new()
	transaction_material.shader = load(SHADER_PATH)

	var g := Gradient.new()
	g.set_color(0, Color.BLACK)
	g.set_color(1, Color.WHITE)
	var grad_tex := GradientTexture2D.new()
	grad_tex.gradient = g
	grad_tex.fill = GradientTexture2D.FILL_LINEAR
	grad_tex.fill_from = Vector2(0.0, 1.0)
	grad_tex.fill_to = Vector2(1.0, 0.0)
	grad_tex.width = 256
	grad_tex.height = 256

	var sg := Gradient.new()
	sg.set_color(0, Color.WHITE)
	sg.set_color(1, Color.BLACK)
	var shape_tex := GradientTexture2D.new()
	shape_tex.gradient = sg
	shape_tex.fill = GradientTexture2D.FILL_RADIAL
	shape_tex.fill_from = Vector2(0.5, 0.5)
	shape_tex.fill_to = Vector2(0.5, 0.0)
	shape_tex.width = 64
	shape_tex.height = 64

	transaction_material.set_shader_parameter("base_color", base_color)
	transaction_material.set_shader_parameter("gradient_texture", grad_tex)
	transaction_material.set_shader_parameter("gradient_fixed", false)
	transaction_material.set_shader_parameter("shape_texture", shape_tex)
	transaction_material.set_shader_parameter("shape_tiling", shape_tiling)
	transaction_material.set_shader_parameter("shape_rotation", shape_rotation)
	transaction_material.set_shader_parameter("shape_scroll", shape_scroll)
	transaction_material.set_shader_parameter("shape_feathering", shape_feathering)
	transaction_material.set_shader_parameter("shape_treshold", shape_treshold)
	transaction_material.set_shader_parameter("width", width)

	color_rect.material = transaction_material

func _update_resolution() -> void:
	var s := get_viewport().get_visible_rect().size
	if color_rect.material:
		color_rect.material.set_shader_parameter("node_resolution", s)

func _set_factor(v: float) -> void:
	if color_rect.material:
		color_rect.material.set_shader_parameter("factor", v)

func cover(duration := 0.5) -> void:
	color_rect.visible = true
	var t := create_tween()
	t.tween_method(_set_factor, 0.0, 1.0, duration)
	await t.finished

func reveal(duration := 0.5) -> void:
	var t := create_tween()
	t.tween_method(_set_factor, 1.0, 0.0, duration)
	await t.finished
	color_rect.visible = false

func _setup_logo_safety() -> void:
	if logo and logo.texture:
		logo.visible = true
		var texture_center = logo.texture.get_size() / 2
		
		if logo.pivot_offset != texture_center:
			var old_pivot = logo.pivot_offset
			logo.pivot_offset = texture_center
			logo.position -= (texture_center - old_pivot) * (Vector2.ONE - logo.scale)

func change_scene_with_standard_fade(scene_enum: SceneConfig.SceneName, show_loading_label: bool = true) -> void:	
	if not config or not config.scenes.has(scene_enum):
		return

	color_rect.material = null
	color_rect.color = Color(0,0,0)
	var target_scene: PackedScene = config.scenes[scene_enum]

	color_rect.mouse_filter = Control.MOUSE_FILTER_STOP
	
	get_tree().change_scene_to_packed(target_scene)
	await cover(3.0)
	
	if show_loading_label:
		_setup_logo_safety()
		loading_screen.modulate.a = 0.0
		loading_screen.visible = true
		var tween_in = create_tween()
		tween_in.tween_property(loading_screen, "modulate:a", 1.0, logo_fade_in_duration)
		await tween_in.finished
	
	if black_screen_duration > 0.0:
		await get_tree().create_timer(black_screen_duration).timeout
		
	if show_loading_label:
		var tween_out = create_tween()
		tween_out.tween_property(loading_screen, "modulate:a", 0.0, logo_fade_out_duration)
		await tween_out.finished
		loading_screen.visible = false
		
	await reveal(fade_out_duration)
	color_rect.mouse_filter = Control.MOUSE_FILTER_IGNORE
	
func change_scene(scene_enum: SceneConfig.SceneName, show_loading_label: bool = true) -> void:	
	if not config or not config.scenes.has(scene_enum):
		return

	color_rect.material = transaction_material
	color_rect.color = Color(0,0,0,0)
	var target_scene: PackedScene = config.scenes[scene_enum]

	color_rect.mouse_filter = Control.MOUSE_FILTER_STOP
	
	await cover(fade_in_duration)
	get_tree().change_scene_to_packed(target_scene)
	
	if show_loading_label:
		_setup_logo_safety()
		loading_screen.modulate.a = 0.0
		loading_screen.visible = true
		var tween_in = create_tween()
		tween_in.tween_property(loading_screen, "modulate:a", 1.0, logo_fade_in_duration)
		await tween_in.finished
	
	if black_screen_duration > 0.0:
		await get_tree().create_timer(black_screen_duration).timeout
		
	if show_loading_label:
		var tween_out = create_tween()
		tween_out.tween_property(loading_screen, "modulate:a", 0.0, logo_fade_out_duration)
		await tween_out.finished
		loading_screen.visible = false
		
	await reveal(fade_out_duration)
	color_rect.mouse_filter = Control.MOUSE_FILTER_IGNORE

func quit_game() -> void:
	get_tree().quit()