extends KinematicBody2D
class_name Player

export var speed: Vector2 = Vector2(150.0, 195.0)
export var gravity: = 410.0
export var max_gravity:= 450.0
export var respawn_position:=Vector2.ZERO


signal landed
signal jumping
signal died

var _velocity: Vector2 = Vector2.ZERO
var _landing_position:Vector2 = Vector2.ZERO
var _in_air = false;
var _alive := false;
func _ready() -> void:
	$AnimationPlayer.play("fade_in")
	respawn_position = position
	
func _physics_process(delta: float) -> void:
	if _alive:
		var is_jump_canceled: = Input.is_action_just_released("jump") and _velocity.y < 0.0
		var direction: = get_direction()
		_velocity = calculate_move_velocity(_velocity, direction, speed, is_jump_canceled, delta)
		_velocity = move_and_slide(_velocity, Vector2.UP)
		update_sprite(direction)
		if is_on_floor() and _in_air:
			_in_air = false
			emit_signal("landed", position)
	
#func get_class(): return "Player"

func get_direction() -> Vector2:
	return Vector2(
		Input.get_action_strength("direction_right") - Input.get_action_strength("direction_left"),
		-1.0 if Input.is_action_just_pressed("jump") and is_on_floor() else 1.0 
	)
	
func calculate_move_velocity(linear_velosity:Vector2, direction:Vector2, speed:Vector2, is_jump_canceled:bool, delta:float)->Vector2:
	var output: = linear_velosity
	output.x = speed.x * direction.x
	output.y += gravity * delta
	if direction.y == -1.0:
		_in_air = true
		output.y = speed.y * direction.y
		emit_signal("jumping", position)
		
		
	if is_jump_canceled:
		output.y = 0
	if output.y < max_gravity*-1:
		output.y = max_gravity
	if output.y > 0 and !is_on_floor():
		_in_air = true;
	return output;

func _respawn():
	position = respawn_position
	_velocity = Vector2.ZERO
	$AnimationPlayer.play("fade_in")

func _revive():
	_alive = true

func update_sprite(direction:Vector2)->void:
	var air_animation = "jump" if _velocity.y <= 0 else "fall"
	if direction.x > 0:
		$AnimationPlayer.play("run" if is_on_floor() else air_animation)
		$Sprite.flip_h = false
	elif direction.x < 0:
		$AnimationPlayer.play("run" if is_on_floor() else air_animation)
		$Sprite.flip_h = true
	else:
		$AnimationPlayer.play("idle")
	if !is_on_floor():
		$AnimationPlayer.play(air_animation)

func _on_die_animation_done():
	emit_signal("died")
	_respawn()

func die():
	_alive = false
	$AnimationPlayer.play("die")