extends Node2D

@export var line_width: float = 25.0
@export var allowed_distance: float = 60.0
@export var selected_shape: String = "rombo"
@export var shape_scale: float = 1.0
@export var margin_ratio: float = 0.1

var shape_points: PackedVector2Array
var current_progress := 0
var fail_count := 0
var tracking := false
var shape_presets := {}

func _ready():
	get_viewport().connect("size_changed", Callable(self, "_on_viewport_resized"))
	_create_shape_presets()
	_draw_selected_shape()

func _draw_selected_shape():
	var screen_size = get_viewport().get_visible_rect().size
	var center = screen_size / 2.0
	var min_dim = min(screen_size.x, screen_size.y)
	var scale = (min_dim * shape_scale * (1.0 - margin_ratio * 2)) / 2

	if shape_presets.has(selected_shape):
		var original = shape_presets[selected_shape]
		var interpolated = _interpolate_shape(original, 100, true)
		shape_points = PackedVector2Array()
		for point in interpolated:
			var scaled_point = center + (point * scale)
			shape_points.append(scaled_point)
	else:
		print("⚠️ Forma no encontrada:", selected_shape)
		return

	$ShapeLine.points = shape_points
	$ShapeLine.width = line_width
	$ShapeLine.default_color = Color.GRAY
	$ShapeLine.texture = null

	$ProgressLine.clear_points()
	$ProgressLine.points = []
	$ProgressLine.width = line_width
	$ProgressLine.default_color = Color.GREEN
	$ProgressLine.texture = null

	current_progress = 0
	fail_count = 0
	tracking = false

func _on_viewport_resized():
	_draw_selected_shape()

func _unhandled_input(event):
	if event is InputEventScreenTouch or event is InputEventMouseButton:
		if event.pressed:
			tracking = true
			current_progress = 0
			fail_count = 0
			$ProgressLine.clear_points()
		else:
			tracking = false

	elif (event is InputEventScreenDrag or event is InputEventMouseMotion) and tracking:
		if current_progress >= shape_points.size():
			return

		var pos = event.position
		var nearest_point = -1
		var min_distance = allowed_distance

		for i in range(current_progress, shape_points.size()):
			var dist = pos.distance_to(shape_points[i])
			if dist < min_distance:
				min_distance = dist
				nearest_point = i

		if nearest_point != -1:
			current_progress = nearest_point
			$ProgressLine.add_point(shape_points[nearest_point])

			if current_progress >= shape_points.size() - 1:
				tracking = false
				print("✅ ¡Forma completada!")
				print("❌ Errores:", fail_count)
		else:
			fail_count += 1
			print("❌ Fuera de la línea. Total:", fail_count)

func _create_shape_presets():
	shape_presets = {
		"cuadrado": [Vector2(-1, -1), Vector2(1, -1), Vector2(1, 1), Vector2(-1, 1)],
		"triangulo": [Vector2(0, -1), Vector2(1, 1), Vector2(-1, 1)],
		"casa": [Vector2(-1, 1), Vector2(-1, 0), Vector2(0, -1), Vector2(1, 0), Vector2(1, 1)],
		"paraguas": [Vector2(-1, 0.5), Vector2(1, 0.5), Vector2(0, -1), Vector2(-1, 0.5), Vector2(0, 1)],
		"diamante": [Vector2(0, -1), Vector2(1, 0), Vector2(0, 1), Vector2(-1, 0)],
		"linea": [Vector2(-1, 0), Vector2(1, 0)],
		"rectangulo": [Vector2(-1, -0.5), Vector2(1, -0.5), Vector2(1, 0.5), Vector2(-1, 0.5)],
		"rombo": [Vector2(0, -1), Vector2(1, 0), Vector2(0, 1), Vector2(-1, 0)],
		"circulo": generate_circle(Vector2.ZERO, 1),
		"estrella": generate_star(Vector2.ZERO, 1),
		"corazon": generate_heart(Vector2.ZERO, 1)
	}

func _interpolate_shape(points: PackedVector2Array, density: int = 100, closed: bool = true) -> PackedVector2Array:
	var interpolated := PackedVector2Array()
	var count = points.size()
	for i in range(count):
		var a = points[i]
		var b = points[(i + 1) % count] if closed or i < count - 1 else null
		if b != null:
			for j in range(density):
				var t = float(j) / density
				interpolated.append(a.lerp(b, t))
	return interpolated

func generate_circle(center: Vector2, radius: float, segments: int = 64) -> PackedVector2Array:
	var points := PackedVector2Array()
	for i in range(segments + 1):
		var angle = 2.0 * PI * float(i) / float(segments)
		points.append(center + Vector2(cos(angle), sin(angle)) * radius)
	return points

func generate_star(center: Vector2, radius: float, spikes: int = 5) -> PackedVector2Array:
	var points := PackedVector2Array()
	var inner_radius = radius * 0.5
	for i in range(spikes * 2):
		var r = radius if i % 2 == 0 else inner_radius
		var angle = PI / float(spikes) * i
		points.append(center + Vector2(cos(angle), sin(angle)) * r)
	points.append(points[0])
	return points

func generate_heart(center: Vector2, size: float) -> PackedVector2Array:
	var points := PackedVector2Array()
	for t in range(0, 360, 10):
		var rad = deg_to_rad(t)
		var x = size * 16 * pow(sin(rad), 3)
		var y = -size * (13 * cos(rad) - 5 * cos(2 * rad) - 2 * cos(3 * rad) - cos(4 * rad))
		points.append(center + Vector2(x, y))
	points.append(points[0])
	return points