extends Node2D

const PROJECTILE := preload("res://scenes/game/weapon_projectile.tscn")
const ARTWORK := preload("res://assets/Ships/external_turret.png")
const AUDIO := preload("res://scripts/game/weapon_audio.gd")
static var _sprite: Texture2D
var mother: CharacterBody2D
var weapon: ItemInstance
var ammunition := 50
var _fire_timer := 0.35
var _age := 0.0
var _flash := 0.0

func _ready() -> void:
	if _sprite == null:
		var image := ARTWORK.get_image()
		image.resize(256,256,Image.INTERPOLATE_LANCZOS)
		image.generate_mipmaps()
		_sprite = ImageTexture.create_from_image(image)
	add_to_group("player_external_turrets")
	z_index = 5
	texture_filter = CanvasItem.TEXTURE_FILTER_LINEAR_WITH_MIPMAPS

func _physics_process(delta: float) -> void:
	if not is_instance_valid(mother) or bool(mother.get("_is_destroyed")) or bool(mother.get("is_docked")) or ammunition <= 0:
		queue_free()
		return
	_age += delta
	_flash = maxf(0.0,_flash-delta)
	_fire_timer = maxf(0.0,_fire_timer-delta)
	var target := _find_target()
	if target != null:
		var direction := target.global_position-global_position
		rotation = rotate_toward(rotation,direction.angle()+PI*0.5,8.0*delta)
		if _fire_timer <= 0.0 and absf(angle_difference(rotation,direction.angle()+PI*0.5)) < 0.12:
			_fire(target)
	queue_redraw()

func _find_target() -> Node2D:
	var closest: Node2D
	var distance := weapon.definition.weapon_range
	for enemy in get_tree().get_nodes_in_group("enemies"):
		if enemy.is_queued_for_deletion() or float(enemy.get("hull")) <= 0.0 or bool(enemy.get("virus_controlled")):
			continue
		var candidate := global_position.distance_to(enemy.global_position)
		if candidate < distance and _clear_shot(enemy):
			distance = candidate
			closest = enemy
	return closest

func _clear_shot(target: Node2D) -> bool:
	var query := PhysicsRayQueryParameters2D.create(global_position,target.global_position,77,[mother.get_rid()])
	var hit := get_world_2d().direct_space_state.intersect_ray(query)
	return hit.is_empty() or hit.get("collider") == target

func _fire(target: Node2D) -> void:
	if ammunition <= 0 or is_queued_for_deletion() or not is_instance_valid(target): return
	var direction := (target.global_position-global_position).normalized()
	var hit: Dictionary = mother.call("roll_weapon_hit",weapon)
	var bullet := PROJECTILE.instantiate()
	bullet.configure(global_position+direction*25.0,direction,ItemDefinition.WeaponKind.MACHINE_GUN,weapon.definition.projectile_speed,float(hit.damage),weapon.definition.weapon_range,null,bool(hit.critical))
	bullet.shield_piercing = weapon.shield_piercing()
	bullet.damage_type_override = weapon.get_damage_type()
	bullet.source_ship = mother
	get_parent().add_child(bullet)
	ammunition -= 1
	_fire_timer = weapon.get_turret_fire_interval()
	_flash = 0.05
	AUDIO.play(get_parent(),global_position,ItemDefinition.WeaponKind.MACHINE_GUN,-8.0)
	mother.get_node("WeaponController").call("_break_cloak_on_fire")
	if ammunition == 0: queue_free()

func _draw() -> void:
	var bob := Vector2(0,sin(_age*2.5)*2.0)
	var appear := smoothstep(0.0,0.3,_age)
	draw_circle(Vector2.ZERO,19.0,Color(0.1,0.7,1.0,0.08))
	draw_arc(Vector2.ZERO,30.0,-PI*0.5,-PI*0.5+TAU*float(ammunition)/50.0,48,Color("70dfff"),1.6,true)
	draw_set_transform(bob,0.0,Vector2.ONE*lerpf(0.4,1.0,appear))
	draw_texture_rect(_sprite,Rect2(-30,-30,60,60),false)
	if _flash > 0.0:
		for x in [-7.0,7.0]:
			draw_line(Vector2(x,-24),Vector2(x,-38),Color("ffdb86"),3.0,true)
			draw_circle(Vector2(x,-28),5.0,Color(1.0,0.65,0.2,0.45))
	draw_set_transform(Vector2.ZERO,-rotation)
	draw_string(ThemeDB.fallback_font,Vector2(-11,43),str(ammunition),HORIZONTAL_ALIGNMENT_CENTER,22,11,Color("b9e7f5"))