2D

extends KinematicBody2D

const MOVE_SPEED = 500
const JUMP_FORCE = 1000
const GRAVITY = 50
const MAX_FALL_SPEED = 1000

onready var anim_player = $AnimationPlayer
onready var sprite = $Sprite

var y_velo = 0
var facing_right = false

func _physics_process(delta):
    var move_dir = 0
    if Input.is_action_pressed("move_right"):
        move_dir += 1
    if Input.is_action_pressed("move_left"):
        move_dir -= 1
    move_and_slide(Vector2(move_dir * MOVE_SPEED, y_velo), Vector2(0, -1))

    var grounded = is_on_floor()
    y_velo += GRAVITY
    if grounded and Input.is_action_just_pressed("jump"):
        y_velo = -JUMP_FORCE
    if grounded and y_velo >= 5:
        y_velo = 5
    if y_velo > MAX_FALL_SPEED:
        y_velo = MAX_FALL_SPEED

    if facing_right and move_dir < 0:
        flip()
    if !facing_right and move_dir > 0:
        flip()

    if grounded:
        if move_dir == 0:
            play_anim("idle")
        else:
            play_anim("walk")
    else:
        play_anim("jump")

func flip():
    facing_right = !facing_right
    sprite.flip_h = !sprite.flip_h

func play_anim(anim_name):
    if anim_player.is_playing() and anim_player.current_animation == anim_name:
        return
    anim_player.play(anim_name)