extends RefCounted
class_name Bullet

const BULLET_SPEED := 9.6
const MAX_LIFE     := 180
const FADE_START   := 150
const HIT_RADIUS   := 9.6

var x: float; var y: float
var vx: float; var vy: float
var life: int = 0
var owner_type: String
var color: Color
var dead: bool = false
var effective_hit_radius: float = HIT_RADIUS
var pierce: bool = false
var pierce_hits: int = 0
var style: String = "default"   # set by spaceship based on equipped weapon

func init(px: float, py: float, heading: float, otype: String) -> void:
	x = px; y = py
	vx = cos(heading) * BULLET_SPEED
	vy = sin(heading) * BULLET_SPEED
	owner_type = otype
	match otype:
		"p1":    color = Color("#88aaff")
		"p2":    color = Color("#44ffaa")
		"enemy": color = Color("#ff4444")
		_:       color = Color.WHITE

func update(world_w: float, world_h: float) -> void:
	x += vx; y += vy
	life += 1
	if x < 0: x += world_w
	elif x > world_w: x -= world_w
	if y < 0: y += world_h
	elif y > world_h: y -= world_h
	if life >= MAX_LIFE: dead = true

func get_alpha() -> float:
	if life >= FADE_START:
		return 1.0 - float(life - FADE_START) / float(MAX_LIFE - FADE_START)
	return 1.0

func draw(canvas: CanvasItem) -> void:
	var a := get_alpha()
	match style:

		"plasma":
			# Strahl — dicke Linie entlang der Flugrichtung, orange-gelb
			var angle := atan2(vy, vx)
			var len := 26.0
			var ca := cos(angle); var sa := sin(angle)
			var bx := x - ca * len * 0.6; var by := y - sa * len * 0.6
			var ex := x + ca * len * 0.4; var ey := y + sa * len * 0.4
			canvas.draw_line(Vector2(bx, by), Vector2(ex, ey), Color(1.0, 0.45, 0.05, a * 0.45), 5.0)
			canvas.draw_line(Vector2(bx, by), Vector2(ex, ey), Color(1.0, 0.75, 0.15, a), 2.0)
			canvas.draw_rect(Rect2(x - 1, y - 1, 3, 3), Color(1.0, 1.0, 0.7, a))

		"laser":
			# Dünner schneller Strahl, cyan-weiß
			var angle := atan2(vy, vx)
			var len := 22.0
			var ca := cos(angle); var sa := sin(angle)
			var bx := x - ca * len; var by := y - sa * len
			canvas.draw_line(Vector2(bx, by), Vector2(x, y), Color(0.3, 0.9, 1.0, a * 0.4), 3.0)
			canvas.draw_line(Vector2(bx, by), Vector2(x, y), Color(0.8, 1.0, 1.0, a), 1.0)
			canvas.draw_rect(Rect2(x - 1, y - 1, 2, 2), Color(1.0, 1.0, 1.0, a))

		"rail":
			# Lange helle Nadel mit blauem Schweif
			var angle := atan2(vy, vx)
			var len := 32.0
			var ca := cos(angle); var sa := sin(angle)
			var bx := x - ca * len; var by := y - sa * len
			canvas.draw_line(Vector2(bx, by), Vector2(x, y), Color(0.4, 0.7, 1.0, a * 0.35), 4.0)
			canvas.draw_line(Vector2(bx, by), Vector2(x, y), Color(0.9, 0.98, 1.0, a), 1.0)
			canvas.draw_rect(Rect2(x - 1, y - 1, 2, 2), Color(1.0, 1.0, 1.0, a))

		"sniper":
			# Mittellange scharfe Nadel, strahlend weiß
			var angle := atan2(vy, vx)
			var len := 18.0
			var ca := cos(angle); var sa := sin(angle)
			var bx := x - ca * len; var by := y - sa * len
			canvas.draw_line(Vector2(bx, by), Vector2(x, y), Color(1.0, 0.95, 0.8, a * 0.5), 2.0)
			canvas.draw_line(Vector2(bx, by), Vector2(x, y), Color(1.0, 1.0, 1.0, a), 1.0)

		"ion":
			# Leuchtender türkiser Orb
			canvas.draw_circle(Vector2(x, y), 6.0, Color(0.2, 0.9, 0.85, a * 0.3))
			canvas.draw_circle(Vector2(x, y), 3.5, Color(0.4, 1.0, 0.95, a * 0.75))
			canvas.draw_rect(Rect2(x - 1, y - 1, 3, 3), Color(0.9, 1.0, 1.0, a))

		"scatter":
			# Kleine schnelle Schrotkügelchen, orange
			canvas.draw_rect(Rect2(x - 1, y - 1, 3, 3), Color(1.0, 0.65, 0.2, a * 0.5))
			canvas.draw_rect(Rect2(x, y, 2, 2), Color(1.0, 0.85, 0.5, a))

		"burst":
			# Winzige schnelle Punkte, hellblau
			canvas.draw_rect(Rect2(x - 1, y - 1, 3, 3), Color(0.5, 0.85, 1.0, a * 0.5))
			canvas.draw_rect(Rect2(x, y, 1, 1), Color(1.0, 1.0, 1.0, a))

		"charge":
			# Großer pulsierender Orb — Radius skaliert mit effective_hit_radius
			var r: float = clamp(effective_hit_radius * 0.55, 4.0, 20.0)
			canvas.draw_circle(Vector2(x, y), r + 4.0, Color(1.0, 0.85, 0.2, a * 0.2))
			canvas.draw_circle(Vector2(x, y), r + 1.5, Color(1.0, 0.95, 0.4, a * 0.45))
			canvas.draw_circle(Vector2(x, y), r, Color(1.0, 1.0, 0.75, a * 0.85))
			canvas.draw_circle(Vector2(x, y), r * 0.45, Color(1.0, 1.0, 1.0, a))

		_:  # "default" — klassischer Dot
			canvas.draw_rect(Rect2(x - 2, y - 2, 5, 5), Color(color.r, color.g, color.b, a * 0.5))
			canvas.draw_rect(Rect2(x - 1, y - 1, 3, 3), Color(color.r, color.g, color.b, a))
			canvas.draw_rect(Rect2(x, y, 1, 1), Color(1, 1, 1, a * 0.9))