extends Spatial

# Member variables
var prev_pos = null
var last_click_pos = null
var viewport = null


func _input(event):
    # Check if the event is a non-mouse event
    var is_mouse_event = false
    var mouse_events = [InputEventMouseButton, InputEventMouseMotion, InputEventScreenDrag, InputEventScreenTouch]
    for mouse_event in mouse_events:
        if (event is mouse_event):
            is_mouse_event = true
            break
  
    # If it is, then pass the event to the viewport
    if (is_mouse_event == false):
        viewport.input(event)


# Mouse events for Area
func _on_area_input_event(camera, event, click_pos, click_normal, shape_idx):
    # Use click pos (click in 3d space, convert to area space)
    var pos = get_node("Area").get_global_transform().affine_inverse()
    # the click pos is not zero, then use it to convert from 3D space to area space
    if (click_pos.x != 0 or click_pos.y != 0 or click_pos.z != 0):
        pos *= click_pos
        last_click_pos = click_pos
    else:
        # Otherwise, we have a motion event and need to use our last click pos
        # and move it according to the relative position of the event.
        # NOTE: this is not an exact 1-1 conversion, but it's pretty close
        pos *= last_click_pos
        if (event is InputEventMouseMotion or event is InputEventScreenDrag):
            pos.x += event.relative.x / viewport.size.x
            pos.y += event.relative.y / viewport.size.y
            last_click_pos = pos
  
    # Convert to 2D
    pos = Vector2(pos.x, pos.y)
  
    # Convert to viewport coordinate system
    # Convert pos to a range from (0 - 1)
    pos.y *= -1
    pos += Vector2(1, 1)
    pos = pos / 2
  
    # Convert pos to be in range of the viewport
    pos.x *= viewport.size.x
    pos.y *= viewport.size.y
    
    # Set the position in event
    event.position = pos
    event.global_position = pos
    if (prev_pos == null):
        prev_pos = pos
    if (event is InputEventMouseMotion):
        event.relative = pos - prev_pos
    prev_pos = pos
    
    # Send the event to the viewport
    viewport.input(event)


func _ready():
    viewport = get_node("Viewport")
    get_node("Area").connect("input_event", self, "_on_area_input_event")