tool
extends "res://objects/enemy/enemy.gd"

export var walk_speed = 25.0
export var left_boundary = 0.0 setget _set_left_boundary
export var right_boundary = 0.0 setget _set_right_boundary
export var direction = 1.0
export var idle_turns = 0
export var turn_time = 0.5
export var shoot_time = 1.0

export var bones_amount = 5
export var bones_speed = 50.0

onready var sprite = $AnimatedSprite
onready var shoot_position = $"%ShootPosition"
onready var shoot_cast = $"%ShootCast"
onready var graphics_cast = $"%GraphicsCast"
onready var shoot_line = $"%ShootLine"
onready var sparks = $SparkParticles
onready var muzzle_flash = $"%MuzzleFlashParticles"

var shooting = false
var turns = 0

const BoneParticle = preload("res://objects/enemy/bone_particle.tscn")

func _ready():
	if Engine.editor_hint:
		update()
		return
	# convert boundaries into actual coordinate positions
	left_boundary = position.x - left_boundary * 8.0
	right_boundary = position.x + right_boundary * 8.0
	# make facing match direction
	sprite.scale.x = direction
	# make animation speed sync to walk speed
	sprite.speed_scale = inverse_lerp(0.0, 25.0, walk_speed)

func _physics_process(delta):
	if Engine.editor_hint:
		return
	if !shooting:
		# check for player in raycast
		var collider = shoot_cast.get_collider()
		if collider != null && (collider.is_in_group("player") or collider.is_in_group("msx")):
			# kill player and enter shooting state temporarily
			collider.get_parent().die()
			# play sound
			Audio.play_sound(Audio.a_die_robot, Audio.ac_boss)
			# muzzle flash
			muzzle_flash.emitting = true
			shooting = true
			get_tree().create_timer(0.05, false).connect("timeout", self, "_stop_shoot")
			sprite.play("shoot")
			# check other raycast to find collision passing through player
			graphics_cast.force_raycast_update()
			var hit_position = graphics_cast.to_global(Vector2(256.0, 0.0))
			if graphics_cast.is_colliding():
				hit_position = graphics_cast.get_collision_point()
			# set line point to point of collision
			var hit_x = shoot_line.to_local(hit_position).x
			shoot_line.points[1].x = hit_x
#			shoot_line.visible = true
#			get_tree().create_timer(0.05, false).connect("timeout", shoot_line, "set_visible", [false], CONNECT_DEFERRED)
			# move and play sparks
			sparks.global_position = hit_position
			sparks.emitting = true
			return
		
		# if there aren't turns, walk around
		if turns == 0:
			sprite.play("walk")
			position.x += direction * walk_speed * delta
			if position.x <= left_boundary:
				position.x = left_boundary
				direction = 1.0
				_do_turn()
			elif position.x >= right_boundary:
				position.x = right_boundary
				direction = -1.0
				_do_turn()

func _do_turn():
	if shooting:
		get_tree().create_timer(turn_time, false).connect("timeout", self, "_do_turn")
		return
	sprite.play("idle")
	# still pause with zero "turns"
	if idle_turns <= 0:
		# set turns to -1 to stop walking
		turns = -1
		# wait for turn_tie
		yield(get_tree().create_timer(turn_time, false), "timeout")
		sprite.scale.x *= -1.0
		# wait a bit after turning
		get_tree().create_timer(turn_time, false).connect("timeout", self, "set", ["turns", 0])
		return
	sprite.scale.x *= -1.0
	if turns < idle_turns * 2:
		turns += 1
		get_tree().create_timer(turn_time, false).connect("timeout", self, "_do_turn")
	else:
		get_tree().create_timer(turn_time, false).connect("timeout", self, "set", ["turns", 0])
#		turns = 0

func _stop_shoot():
	shooting = false
	shoot_line.visible = false
	if turns == 0:
		sprite.play("walk")
	else:
		sprite.play("idle")

# editor debug drawing
func _draw():
	if Engine.editor_hint:
		var left = -left_boundary * 8.0
		var right = right_boundary * 8.0 + 8.0
		draw_line(
			Vector2(left, 0.0),
			Vector2(right, 0.0),
			Color(0.4, 0.2, 0.6, 0.75), 1.01, false
		)
		draw_line(
			Vector2(left, 2.0),
			Vector2(left, -2.0),
			Color(0.4, 0.2, 0.6, 0.75), 1.01, false
		)
		draw_line(
			Vector2(right, 2.0),
			Vector2(right, -2.0),
			Color(0.4, 0.2, 0.6, 0.75), 1.01, false
		)

func _set_left_boundary(value):
	left_boundary = value
	if Engine.editor_hint:
		update()

func _set_right_boundary(value):
	right_boundary = value
	if Engine.editor_hint:
		update()
		
func die():
	for n in bones_amount:
		var bone = BoneParticle.instance()
		bone.rotation = rand_range(0.0, 2.0*PI) # random rotation
		bone.global_position = global_position
		bone.linear_velocity = Vector2(bones_speed * rand_range(0.5, 1.5), 0.0).rotated(rand_range(-PI, 0.0))
		bone.angular_velocity = rand_range(-PI*2.0, PI*2.0)
		var timer = get_tree().create_timer(3.0 + rand_range(0.0, 1.0), false)
		timer.connect("timeout", bone, "queue_free")
		get_parent().call_deferred("add_child", bone)
	.die() # call rest of enemy.gd die() funciton