extends KinematicBody2D
export var swim_length   = 150
export var swim_cooldown = 1

var destination # The position the fish will move to _on_SwimTimer_timeout()

var poisoned = false # Used in Hazards/Poison/Poison.gd to determine if fish is dying of poison
var poison_mutation = true # True when fish can eat and shoot poison pellets
var pellets = 0 # Tracks the number of poison pellets eaten but not shot yet
onready var mouth = $Positions/Mouth.position # Used for eating poison pellets
onready var mouth_inhale = $Positions/MouthInhale.position
onready var tail = $Positions/Booty


func _ready():
	$SwimTimer.wait_time = swim_cooldown

func _on_SwimTimer_timeout() -> void:
	# Swim toward mouse
	destination = Vector2(move_toward(position.x, get_global_mouse_position().x, swim_length), move_toward(position.y, get_global_mouse_position().y, swim_length))
	$Tween.interpolate_property(self, "position", position, destination, 1, Tween.TRANS_CUBIC, Tween.EASE_IN_OUT)
	$Tween.start()


func _process(delta: float) -> void:
	if destination:
		# Smoothly rotate Fish to face mouse
		var v = get_global_mouse_position() - global_position
		var angle = v.angle() + deg2rad(270)
		if rad2deg(angle) < 180 or rad2deg(angle) > 360:
			$Sprite.flip_v = true
		else:
			$Sprite.flip_v = false
		var rotation_speed = PI * 0.75 # PI = 180 degrees
		var angle_delta = rotation_speed * delta
		angle = lerp_angle(global_rotation, angle + 1.57, 1.0)
		angle = clamp(angle, global_rotation - angle_delta, global_rotation + angle_delta)
		global_rotation = angle


func _fire_pellet() -> void:
	if pellets > 0:
		var poison_scene = load("res://Hazards/Poison/Poison.tscn")
		var poison = poison_scene.instance()
		add_child(poison)
		poison.position = position
		#poison.direction = position.angle_to_point(mouth)
		poison.applied_force = Vector2(mouth.get_global_position(), tail.get_global_position())


func kill(cause: String) -> void:
	queue_free()