extends KinematicBody

var dir = Vector3()
const GRAVITY = -24.8
var vel = Vector3()
const MAX_SPEED = 20
const ACCEL= 4.5
const FLY_SPEED = 7

const DEACCEL= 16
const MAX_SLOPE_ANGLE = 40

var camera_rotation
var camera

var MOUSE_SENSITIVITY = 0.05


func _ready():
    camera_rotation = $Camera_rotation_helper
    camera = $Camera_rotation_helper/Camera

func _process(delta):
    process_input(delta)
    process_movement(delta)


func process_input(delta):
    # ----------------------------------
    # Walking
    dir = Vector3()
    var cam_xform = camera.get_global_transform()

    var input_movement_vector = Vector3()
    var cam_scroll = 0.0

    if Input.is_action_pressed("move_up"):
        input_movement_vector.z += 1
    if Input.is_action_pressed("move_down"):
        input_movement_vector.z -= 1
    if Input.is_action_pressed("move_left"):
        input_movement_vector.x -= 1
    if Input.is_action_pressed("move_right"):
        input_movement_vector.x = 1

    input_movement_vector = input_movement_vector.normalized()

    dir += -cam_xform.basis.z.normalized() * input_movement_vector.z
    dir += cam_xform.basis.x.normalized() * input_movement_vector.x
    
    if Input.is_action_pressed("fly_up"):
        vel.y = FLY_SPEED
    elif Input.is_action_pressed("fly_down"):
        vel.y = -FLY_SPEED
    else:
        vel.y = 0

    
func process_movement(delta):
    dir.y = 0
    dir = dir.normalized()

#    vel.y += delta*GRAVITY

    var hvel = vel
    hvel.y = 0

    var target = dir
    target *= MAX_SPEED

    var accel
    if dir.dot(hvel) > 0:
        accel = ACCEL
    else:
        accel = DEACCEL

    hvel = hvel.linear_interpolate(target, accel*delta)
    vel.x = hvel.x
    vel.z = hvel.z
    vel = move_and_slide(vel,Vector3(0,1,0), 0.05, 4, deg2rad(MAX_SLOPE_ANGLE))


func _input(event):
    if event is InputEventMouseMotion and Input.get_mouse_mode() == Input.MOUSE_MODE_CAPTURED:
        camera_rotation.rotate_x(deg2rad(event.relative.y * MOUSE_SENSITIVITY * -1))
        self.rotate_y(deg2rad(event.relative.x * MOUSE_SENSITIVITY * -1))
        
        var camera_rot = camera_rotation.rotation_degrees
        camera_rot.x = clamp(camera_rot.x, -30, 30)
        camera_rotation.rotation_degrees = camera_rot
        
     
    if event is InputEventMouseButton and Input.get_mouse_mode() == Input.MOUSE_MODE_CAPTURED:
        
        # to prevent the cam sliding effect when clamp limit reached.
        var old_x_translation = camera.translation.x
        
        var cam_scroll = Vector3( 0.0, 0.0, 0.0 )
        if event.button_index == BUTTON_WHEEL_UP:
            cam_scroll.z = -1.0 * MOUSE_SENSITIVITY
        if event.button_index == BUTTON_WHEEL_DOWN:
            cam_scroll.z = 1.0 * MOUSE_SENSITIVITY
         
        camera.translate( cam_scroll )
        
        camera.translation.x = old_x_translation
        camera.translation.z = clamp(camera.translation.z, -5, 0)

    if event.is_action_pressed( "game_flashlight" ) and not event.is_echo():
        camera.get_node( "Flashlight" ).visible =  not camera.get_node( "Flashlight" ).visible