extends KinematicBody2D

# Default thrust speed.
var thrust_speed : int = 20000

# Default angular speed.
var angular_speed : float = PI

# Drag.
var drag : int = 100

# Velocity.
var velocity : Vector2 = Vector2.ZERO

# Read user input & apply.
func get_input(delta):

    # Check for brake & adjust drag.
    if Input.is_action_pressed("brake"):
        drag = 1000
    else:
        drag = 100

    # Apply drag.
    if velocity.x > 0:
        if velocity.x >= drag: velocity.x -= drag
        else: velocity.x = 0
    elif velocity.x < 0:
        if velocity.x <= drag: velocity.x += drag
        else: velocity.x = 0
    if velocity.y > 0:
        if velocity.y >= drag: velocity.y -= drag
        else: velocity.y = 0
    elif velocity.y < 0:
        if velocity.y <= drag: velocity.y += drag
        else: velocity.y = 0

    # Check for guns.
    if Input.is_action_pressed("left_gun"):
        $LeftGun.fire()
    if Input.is_action_pressed("right_gun"):
        $RightGun.fire()

    # Reset direction.
    var direction = 0

    # Check for turns & adjust rotation.
    if Input.is_action_pressed("turn_left"):
        direction = -1
    if Input.is_action_pressed("turn_right"):
        direction = 1
    rotation += angular_speed * direction * delta

    # Check for thrust & adjust velocity.
    if Input.is_action_pressed("thrust"):
        velocity = Vector2.UP.rotated(rotation) * thrust_speed
        $ThrustSprite.play()
        $ThrustSprite.show()
    else:
        $ThrustSprite.hide()
        $ThrustSprite.stop()

    # Apply movement.
    move_and_slide(velocity * delta)

# Physics process.
func _physics_process(delta):
    # Receive user input.
    get_input(delta)