extends Node2D

var spaceState:World2D
var query : PhysicsPointQueryParameters2D
var CastResult : Array

var hoveredColliders : Array
var hoveredCollider:CollisionObject2D
var hoveredStickerNode:Sticker
var grabbedStickerNode:Sticker
var grabbedStickerOffset:Vector2

enum CURSOR_STATE {DEFAULT, CLICK, GRAB, GRABBED}
var currentCursorState:CURSOR_STATE = CURSOR_STATE.DEFAULT
var oldCursorState:CURSOR_STATE = CURSOR_STATE.DEFAULT
var cursorPlaying:bool
	
# Called when the node enters the scene tree for the first time.
func _ready():
	if not OS.is_debug_build():
		Input.set_mouse_mode(Input.MOUSE_MODE_CONFINED_HIDDEN)
	query = PhysicsPointQueryParameters2D.new()
	spaceState = get_world_2d()

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(_delta):
	#region Cursor Position
	position = get_global_mouse_position()
	#endregion
	pointcast()
	cursor_look()
	if (grabbedStickerNode != null):
		grabbedStickerNode.get_parent().position = grabbedStickerOffset+get_global_mouse_position()


func pointcast():
	resetCast()
	query.collide_with_areas = true
	query.collide_with_bodies = false
	query.position = get_global_mouse_position()
	CastResult = spaceState.direct_space_state.intersect_point(query) 
	# CastResult is not reliable. Objects are added randomly in the array 
	# so we need to filter/sort the trace result
	if ( CastResult.size() > 0 and (grabbedStickerNode == null)):

		#region Fill hoveredColliders
		for _object in CastResult:
			if(_object.collider.input_pickable == true):
				hoveredColliders.append(_object.collider)
		#endregion
		if (hoveredColliders.size() > 0):
			if (hoveredColliders.size() >= 2):
				hoveredColliders = sortByPosY(hoveredColliders,false)
			if (hoveredColliders[0] != hoveredCollider):
				$GrabTimer.stop()
				if (hoveredCollider and hoveredCollider.has_method("on_unhover")):
					hoveredCollider.on_unhover()
				hoveredCollider = hoveredColliders[0]
				if (hoveredCollider and hoveredCollider.has_method("on_hover")):
					hoveredCollider.on_hover()
				print("Current hovered object :", hoveredCollider)
				if (Global.isSticker(hoveredCollider)):
					hoveredStickerNode = hoveredCollider
					print("Current hovered sticker :", hoveredStickerNode)
				else:
					hoveredStickerNode = null
		else:
			resetCast(true)
	else:
		resetCast(true)
		
func resetCast(bFull = false):
	CastResult.clear()
	hoveredColliders.clear()
	if bFull:
		if (hoveredCollider != null and hoveredCollider.has_method("on_unhover") and (hoveredCollider != grabbedStickerNode)):
			hoveredCollider.on_unhover()
		hoveredCollider = null
		hoveredStickerNode = null

## Sort objects by parent's Y position
func sortByPosY(objects: Array, ascending_order: bool = true):
	var _tempArray :Array
	var _tempStickerArray :Array
	_tempArray = objects
	#filter stickers
	for _collider in _tempArray:
		if _collider is Sticker:
			_tempStickerArray.append(_collider)
	if _tempStickerArray.size() > 0:
		_tempStickerArray.sort_custom(compareNodeOrder)
		_tempArray = _tempStickerArray
	else:
		_tempArray.sort_custom(comparePosY)
	# Reverse if descending order is required
	if not ascending_order:
		_tempArray.reverse()
	return _tempArray

func compareNodeOrder(a, b):
	return a.get_parent().get_index() < b.get_parent().get_index()
func comparePosY(a, b):
	#print("Compare ",a," at ",a.position.y, " and ",b," at ",b.position.y )
	return a.get_parent().position.y < b.get_parent().position.y #Sticker are always at 0, so we need parent position
	
	
func _input(rawInputEvent:InputEvent):
	if (rawInputEvent.is_action_pressed("select")):
		cursorClick()
		$GrabTimer.start()
	if (rawInputEvent.is_action_released("select")):
		$GrabTimer.stop()
		if (grabbedStickerNode != null):
			grab_end()
		
func grab_start():
	if (hoveredStickerNode and grabbedStickerNode == null):
		grabbedStickerNode = hoveredStickerNode

		print("Grabbed ", grabbedStickerNode)
		grabbedStickerOffset = grabbedStickerNode.get_parent().position - get_global_mouse_position()
		print("offset =", grabbedStickerOffset, " Stickpos:",grabbedStickerNode.get_parent().position,"-",get_global_mouse_position() )
		if (grabbedStickerNode.has_method("on_grab")):
			grabbedStickerNode.on_grab(grabbedStickerOffset)
			
func grab_end():
	if (grabbedStickerNode.has_method("on_released")):
		grabbedStickerNode.on_unhover()
		grabbedStickerNode.on_released()
		
	
	print("stopg grabbin at ",query.position )
	DebugDraw.points.append(query.position)
	DebugDraw.drawPoints()
	
	grabbedStickerNode = null
	
func cursorClick():
	if (hoveredCollider and hoveredCollider.has_method("on_click")):
			hoveredCollider.on_click()
		
func cursor_look():
	if (grabbedStickerNode ):
		currentCursorState = CURSOR_STATE.GRABBED
	elif (hoveredStickerNode):
		if ($GrabTimer and !($GrabTimer.is_stopped())):
			currentCursorState = CURSOR_STATE.GRABBED
		else:
			currentCursorState = CURSOR_STATE.GRAB
	elif ($GrabTimer and !($GrabTimer.is_stopped())):
		currentCursorState = CURSOR_STATE.CLICK
	else:
		currentCursorState = CURSOR_STATE.DEFAULT

	if (currentCursorState != oldCursorState):
		oldCursorState = currentCursorState
		match oldCursorState:
			CURSOR_STATE.DEFAULT:
				$AnimatedSprite2D.play("default")
			CURSOR_STATE.CLICK:
				$AnimatedSprite2D.play("click")
			CURSOR_STATE.GRAB:
				$AnimatedSprite2D.play("grab_intro")
			CURSOR_STATE.GRABBED:
				$AnimatedSprite2D.play("grab")


func _on_grab_timer_timeout():
	grab_start()


func _on_animated_sprite_2d_animation_changed():
	cursorPlaying = true


func _on_animated_sprite_2d_animation_finished():
	cursorPlaying = false