@tool
extends Node2D
## Visual and collision bounds share the node origin, in native game pixels.
@export_enum("fighter", "boss", "butterfly", "bee", "shot", "enemy_shot", "explosion", "enemy_explosion") var kind := "fighter":
	set(value):
		kind = value
		queue_redraw()
@export var damaged := false
@export var radius := 6.0
var animation_time := 0.0
var spinning := false
var spin_time := 0.0
@export var heading := Vector2.DOWN
const SHEET = preload("res://games/galaga/art/spr_galaga.png")
const DIRECTION_ROWS := {"boss":36, "boss_damaged":54, "butterfly":72, "bee":108}

func _ready() -> void:
	texture_filter = CanvasItem.TEXTURE_FILTER_NEAREST
	if kind not in ["shot", "enemy_shot"]:
		var sprite_material := ShaderMaterial.new()
		sprite_material.shader = preload("res://games/galaga/actors/sprite.gdshader")
		material = sprite_material

func _process(_delta: float) -> void:
	queue_redraw()

func _draw() -> void:
	# Quantize the rendered center in native 224x288 coordinates, before the
	# view's integer enlargement. Keep simulation positions precise.
	draw_set_transform(position.round()-position)
	if kind in ["shot", "enemy_shot"]:
		draw_rect(Rect2(-1, -3, 2, 6), Color.CYAN if kind == "shot" else Color.SALMON)
		return
	if kind == "explosion":
		var frame := mini(3, int(animation_time * 12))
		draw_texture_rect_region(SHEET, Rect2(-16,-16,32,32), Rect2(145 + frame * 34, 1, 32,32))
		return
	if kind == "enemy_explosion":
		var frame := mini(4, int(animation_time * 15))
		draw_texture_rect_region(SHEET, Rect2(-16,-16,32,32), Rect2(289+frame*34,1,32,32))
		return
	var source := Vector2(108,0)
	var destination := Rect2(-8,-8,16,16)
	if kind=="fighter" and spinning:
		var facing := Vector2.UP.rotated(spin_time*TAU*2)
		var column := 6-clampi(roundi(atan2(absf(facing.x),absf(facing.y))/(PI/12)),0,6)
		source=Vector2(column*18,0)
		if facing.x>0: destination.size.x=-16
		if facing.y>0: destination.size.y=-16
	if kind in ["boss", "butterfly", "bee"]:
		# Seven authored angles from right to down, at 15-degree intervals.
		# Mirror these pixels into the other quadrants; never rotate the texture.
		var column := 6 - clampi(roundi(atan2(absf(heading.x),absf(heading.y))/(PI/12)),0,6)
		# Adjacent rows are different sprites, not interchangeable wing frames.
		var row: int = DIRECTION_ROWS["boss_damaged" if kind == "boss" and damaged else kind]
		source = Vector2(column*18,row)
		if heading.x < 0: destination.size.x = -16
		if heading.y < 0: destination.size.y = -16
	draw_texture_rect_region(SHEET, destination, Rect2(source+Vector2.ONE,Vector2(16,16)))
	if Engine.is_editor_hint():
		draw_arc(Vector2.ZERO, radius, 0, TAU, 24, Color(0,1,0,0.5))