class_name CardBoard extends PanelContainer

enum {NAVIGATE, ASSIGN, DRAG}
enum Error {
	OK,
	OUT_OF_BOUNDS,
	ILLEGAL_STATE,
	MISSING
}

var focus_stickies:bool = true:
	set(stickies):
		if not is_node_ready(): return
		if stickies and sticky_note_container.get_child_count() == 0: return
		
		# this messes things up if called unneeded.
		if focus_stickies != stickies:
			focus_stickies = stickies
			
			if not current_context == ASSIGN:
				if stickies:
					current_sticky_note_id = current_sticky_note_id
				else:
					current_dropzone_id = current_dropzone_id    

var has_stage = false:
	set(focus):
		if focus:
			has_stage = true
			get_tree().call_group("interactables", "collapse")
			current_dropzone_id = 0
			current_sticky_note_id = 0
			focus_stickies = true
		else:
			has_stage = false
		if is_node_ready():
			if focus:
				process_mode = Node.PROCESS_MODE_INHERIT
			else:
				process_mode = Node.PROCESS_MODE_DISABLED
				for sticky in dropzone.get_children():
					if sticky is StickyNote:
						sticky.is_dragged = false
		visible = has_stage

@onready var dropzone = $HBoxContainer/dropzone
var dropzone_size: Vector2
@export var dropzone_padding:int = 100
@onready var sticky_note_container = $HBoxContainer/ScrollContainer/VBoxContainer
@onready var current_context:int = NAVIGATE:
	set(context):
		#if current_context == ASSIGN and !context == ASSIGN:
		#	sticky_note_container.get_child(current_sticky_note_id).clear_if_empty()
		#match context:
		#    NAVIGATE:
		#        _return_sticky_notes_to_panels()
		#    DRAG:
		#        pass
		#    ASSIGN:
		#        pass
		current_context = context
@onready var instructions = $instructions_panel/HBoxContainer/cards_remaining
@onready var timer: Timer = $Timer

var mementos_collected: int = 0:
	set(mementos):
		mementos_collected = mementos
		match mementos:
			1:
				instructions.text = "There are three Mementos left to find."
			2:
				instructions.text = "You have collected half of the mementos."
			3:
				instructions.text = "Find the last Memento to complete the Board."
			4:
				instructions.text = "Combine cards to order your thoughts."

@onready var currently_active_node: Area2D = null:
	set(new_node):
		# this makes sure no accidental context switches can happen while a card is being dragged.
		if not (current_context == DRAG):
			if not currently_active_node == null:
				currently_active_node.highlighted = false
			currently_active_node = new_node
			if not currently_active_node == null:
				currently_active_node.highlighted = true

@onready var current_dropzone_id: int = 0:
	set(new_id):
		if is_node_ready():
			if new_id > dropzone.get_child_count() - 1: current_dropzone_id = 0
			elif new_id < 0: current_dropzone_id = dropzone.get_child_count() - 1
			else: current_dropzone_id = new_id
			if current_context == ASSIGN and not focus_stickies:
				while not dropzone.get_child(current_dropzone_id) is Card:
					current_dropzone_id = (current_dropzone_id + (1 if not new_id == -1 else -1)) % dropzone.get_child_count()
				dropzone.get_child(current_dropzone_id).preview_sticky_note(currently_active_node)

			elif not focus_stickies:
				currently_active_node = dropzone.get_child(current_dropzone_id)
		
@onready var current_sticky_note_id: int = 0:
	set(new_id):
		if is_node_ready():
			if sticky_note_container.get_child_count() < 1: return
			elif sticky_note_container.get_child_count() == 1: current_sticky_note_id = 0
			elif new_id > sticky_note_container.get_child_count() - 1: current_sticky_note_id = 0
			elif new_id < 0: current_sticky_note_id = sticky_note_container.get_child_count() - 1
			elif sticky_note_container.get_child(new_id).invalid:
				if sticky_note_container.get_child_count() == 1: return
				if new_id+1 == sticky_note_container.get_child_count():
					current_sticky_note_id = new_id-1
				else:
					current_sticky_note_id = new_id+1
			else: current_sticky_note_id = new_id
			if current_context == ASSIGN:
				_return_sticky_notes_to_panels()
				currently_active_node.preview_sticky_note(sticky_note_container.get_child(current_sticky_note_id).attached_sticky_note)
			elif focus_stickies:
				if sticky_note_container.get_child(current_sticky_note_id).get_child_count() == 1:
					currently_active_node = sticky_note_container.get_child(current_sticky_note_id).get_child(0)
				else:
					for i in range(sticky_note_container.get_child_count() - 1):
						if sticky_note_container.get_child(i).get_child_count() == 1:
							currently_active_node  = sticky_note_container.get_child(i).get_child(0)

var last_save_dict: Dictionary
var text_recovery: Dictionary

signal board_completed

# Called when the node enters the scene tree for the first time.
func _ready():
	var size_reference = StickyNotePanel.new()
	
	dropzone_size = get_viewport_rect().size - Vector2(dropzone_padding + size_reference.minimum_size.x, dropzone_padding)
	
	if get_parent() == get_tree().root:
		populate_board(["c_void", 'c_gifted', "p_wet", "p_joy"])
		populate_board(["c_jui_jutsu", 'c_hit', "p_girly", "p_vent"])
		populate_board(["c_comic_heroes", 'c_teasing', "p_agent_q", "p_good_intended"])
		populate_board(["c_out_of_world", 'c_confusion', "p_outer_conflict", "p_unique"])

	has_stage = has_stage
	
	get_viewport().gui_focus_changed.connect(reclaim_lost_focus)
	
	#FIXME properly implement board recovery
	#timer.timeout.connect(validate_board)
	#timer.start()
	
	#await get_tree().process_frame
	#last_save_dict = get_save_dict()


func reclaim_lost_focus(_thief):
	if has_stage:
		grab_focus()

#func _process(delta):
#	# drops dragged area when Mouse is no longer pressed.
#	if has_stage and !Input.is_mouse_button_pressed(MOUSE_BUTTON_LEFT) and current_context == DRAG:
#		currently_active_node.is_dragged = false

## Will be used later to spawn Cards and Post-Its and remember them in the dictionary 
func populate_board(card_names: Array[StringName]):
	mementos_collected += 1
	
	var all_new:Dictionary = HardCards.get_cards_by_name_array(card_names)
	
	# spawning the cards and adding them to the dictionary
	for new_card: Card in all_new["cards"]:
		add_card(new_card, false)
		# marking the first card as random picks
		new_card.picked_random = new_card.name == card_names[1]
	for new_sticky_note: StickyNote in all_new["sticky_notes"]:   # spawning a sticky note
		add_sticky_note(new_sticky_note, false)
		# marking the first sticky as random picks
		new_sticky_note.picked_random = new_sticky_note.name == card_names[3]
	
	#currently_active_node = area_dict["dropzone_content"][0]  # set first Card as currently selected node by default
	currently_active_node = dropzone.get_child(0)

func add_card(card: Card, reparent:bool = true):
	if reparent:
		card.reparent(self)
	else:
		add_child(card)
	card.position = Vector2(randi_range(dropzone_padding, dropzone_size.x), randi_range(dropzone_padding, dropzone_size.y))
	insert_area(dropzone, card)
	card.set_owner(self)
	card.is_dragable = true
	
func add_sticky_note(sticky: StickyNote, reparent:bool = true):
	var new_panel = StickyNotePanel.new()
	sticky_note_container.add_child(new_panel, true, Node.INTERNAL_MODE_DISABLED)
	#WARNING this for some reason would break the tweens
	new_panel.set_owner(self)
	sticky.current_handle = self
	new_panel.attatch_sticky_note(sticky, self, false, reparent)
	
# Checks if a Node is currently inside the dropzone
func is_in_dropzone(to_check: Node) -> bool:
	return dropzone.get_rect().has_point(to_check.global_position)

# Called by notes when a mouse event needs handling
func handle_mouse_button(input: InputEventMouseButton, to_handle = currently_active_node):
	
	# Makes sure that only the same area is dragged.
	# Otherwise overlapping areas are dragged at the same time. 
	if current_context == DRAG and to_handle != currently_active_node:
		return
	
	if input.button_index == MOUSE_BUTTON_MASK_LEFT and input.pressed:
		currently_active_node = to_handle
		to_handle.is_dragged = true
		if to_handle is StickyNote:
			if not to_handle.on_board:
				to_handle.reparent(dropzone)
				to_handle.on_board = true
				to_handle.attached_to = self
		current_context = DRAG
	

	# when Drag stops ...
	if input.button_index == MOUSE_BUTTON_MASK_LEFT and not input.pressed:
		to_handle.is_dragged = false
		if to_handle is StickyNote:
			if is_in_dropzone(to_handle):
				if to_handle.has_overlapping_areas():
					for area in to_handle.get_overlapping_areas():
						if area is Card:
							focus_stickies = false
							if area.has_sticky_note_attached():
								to_handle = area.exchange_sticky_note_with(to_handle)
								to_handle.reparent(dropzone)
								to_handle.on_board = true
								if sticky_note_container.get_child_count() > 0:
									sticky_note_container.get_child(current_sticky_note_id).attached_sticky_note = to_handle
									to_handle.attached_to = sticky_note_container.get_child(current_sticky_note_id)
								else:
									var new_panel = StickyNotePanel.new()
									sticky_note_container.add_child(new_panel, true, Node.INTERNAL_MODE_DISABLED)
									new_panel.owner = self
									new_panel.attatch_sticky_note(to_handle, self, false)
									current_sticky_note_id = 0
								to_handle.reset_drag()
								current_context = NAVIGATE
								_return_sticky_notes_to_panels()
								return
							else:
								area.attach_sticky_note(to_handle)
								to_handle.z_index = 0
								if sticky_note_container.get_child_count() > 0:
									sticky_note_container.get_child(current_sticky_note_id).clear_if_empty()
								current_context = NAVIGATE
								check_board_comnpletion()
								return
			else:
				var i: int = 0
				for panel: StickyNotePanel in sticky_note_container.get_children():
					i += 1
					if panel.is_empty:
						if panel.get_global_rect().intersects(Rect2(to_handle.global_position - Vector2(to_handle.diameter/2, 10), Vector2(to_handle.diameter/2, 10))):
							panel.attatch_sticky_note(to_handle, self)
					elif panel.is_gapped or i == sticky_note_container.get_child_count():
						panel.collapse_gap()
						var new_panel = StickyNotePanel.new()
						sticky_note_container.add_child(new_panel)
						sticky_note_container.move_child(new_panel, i)
						new_panel.attatch_sticky_note(to_handle, self)
						new_panel.owner = self
					panel.clear_if_empty()
				_return_sticky_notes_to_panels()
				current_context = NAVIGATE
				return
		
		## Dropping Cards and Sticky Notes not causing a return condition above.
		if not (to_handle is StickyNote and to_handle.is_sticky_note_attached()):
			if to_handle.get_parent() is Card:
				insert_area(to_handle.get_parent().remove_sticky_note(), to_handle)
			else:
				insert_area(dropzone, to_handle)
		current_context = NAVIGATE
		focus_stickies = false
		current_dropzone_id = dropzone.get_children().find(to_handle)
		if to_handle is StickyNote:
			to_handle.rotation = to_handle.base_rotation
			to_handle.scale = to_handle.base_scale

		if input.is_action_pressed("mouse_right") and current_context == DRAG:
			to_handle.reset_drag()


func _return_sticky_notes_to_panels():
	if not (current_context == ASSIGN and focus_stickies): return #FIXME this is an early return to prevent race conditions. Check if it is save to be removed.
	for panel:StickyNotePanel in sticky_note_container.get_children():
		panel.reclaim_sticky_note()
		
	for node in dropzone.get_children():
		if node is StickyNote:
			node.is_dragable = true

var board_was_completed: bool = false
func check_board_comnpletion():
	if is_board_complete():
		for child:StickyNotePanel in sticky_note_container.get_children():
			child.clear_if_empty()
		if not board_was_completed:
			board_was_completed = true
			board_completed.emit()
	if board_was_completed:
		give_lore_feedback()

func is_board_complete():
	if mementos_collected == 4:
		for card in dropzone.get_children():
			if card is Card:
				if not card.has_sticky_note_attached():
					return false
		return true
	return false

var unfitting: bool = false
var incomplete: bool = false
var complete: bool = false
func give_lore_feedback():
	var fitting_card_count: int = 0
	var total_card_count: int = 0
	
	for child in dropzone.get_children():
		if child is Card:
			if child.has_sticky_note_attached():
				fitting_card_count += int(child.card_id == child.get_attached_sticky_note().parent_id)
			total_card_count += 1
	
	if float(fitting_card_count) / float(total_card_count) < 0.2:
		instructions.text = "You can move on, but you may not have understood Lisa."
		if not unfitting:
			if State.speech_language == 2:
				$AnimationPlayer.play("unfitting_de")
			else:
				$AnimationPlayer.play("unfitting")
			unfitting = true
	#FIXME: check if this logic (after the "or") is still needed.
	elif fitting_card_count != total_card_count or (total_card_count != dropzone.get_child_count() and sticky_note_container.get_child_count() != 0):
		instructions.text = TranslationServer.translate("You may leave the room, but Lisa only agrees with %d of the %d connections.") % [fitting_card_count, total_card_count]
		if not incomplete:
			if State.speech_language == 2:
				$AnimationPlayer.play("incomplete_de")
			else:
				$AnimationPlayer.play("incomplete")
			incomplete = true
	else:
		instructions.text = "Lisa would like you to leave her room and move on."
		if not complete:
			if State.speech_language == 2:
				$AnimationPlayer.play("complete_de")
			else:
				$AnimationPlayer.play("complete")
			complete = true

func is_board_lore() -> bool:
	for card in dropzone.get_children():
		if card is Card:
			if card.has_sticky_note_attached():
				if not card.current_sticky_note.sticky_id.contains(card.card_id): return false
	return true
		
# Mark area that was hovered over as currently selected
func handle_hover(to_handle: Area2D):
	if Input.is_mouse_button_pressed(MOUSE_BUTTON_LEFT): return
	currently_active_node = to_handle
	
	if is_in_dropzone(to_handle) or to_handle is Card:
		if not (current_context == ASSIGN and not currently_active_node.is_dragged): #Prevent Mouse input from messing up directional control selections
			if not (to_handle is StickyNote and !to_handle.on_board):
				current_dropzone_id = dropzone.get_children().find(to_handle)
			focus_stickies = false
	else:
		current_sticky_note_id = sticky_note_container.get_children().find(to_handle.attached_to)
		focus_stickies = true
		
# Adds a child at the correct child indext in an area
func insert_area(parent: Control, node: Area2D):
	var children:Array = parent.get_children()    
	var i = 0
	
	if not node in parent.get_children():
		node.reparent(parent)
		if node is StickyNote:
			node.on_board = true
		node.owner = self
	
	if children.size() > 0:
		children.erase(node)
		while children[i].global_position.y < node.global_position.y and i+1 < children.size():
			i+=1    
		parent.move_child(node, i)
		
	if node is StickyNote:
		node.attached_to = self
		node.is_dragable = true
	
# Takes the inputs for control inputs
func _input(event):
	
	if not has_stage or not is_instance_valid(currently_active_node): return

	if event.is_action_pressed("ui_cancel"):
		State.leave_stage(self)
		get_viewport().set_input_as_handled()
	
	if event is InputEventMouse:
		# makes sure to pass release events so notes do not get attached to the mouse while the cursor leaves the area.
		if event is InputEventMouseButton and current_context == DRAG:
			if event.button_index == MOUSE_BUTTON_LEFT and not event.pressed:
				handle_mouse_button(event)
				get_viewport().set_input_as_handled()
		else:
			return

	if current_context != DRAG:
		var selection_position: Vector2
		if current_context == ASSIGN:
			selection_position = dropzone.get_child( current_dropzone_id ).global_position
		else:
			selection_position = currently_active_node.global_position
		
		if event.is_action_pressed("ui_up"):
			if focus_stickies:
				current_sticky_note_id -= 1
			else:
				if not try_select_nearest_card(selection_position, Vector2.UP):
					current_dropzone_id -= 1
			get_viewport().set_input_as_handled()
	
		elif event.is_action_pressed("ui_down"):       # down to select an element beneath
			if focus_stickies:
				current_sticky_note_id += 1
			else:
				if not try_select_nearest_card(selection_position, Vector2.DOWN):
					current_dropzone_id += 1
			get_viewport().set_input_as_handled()
			
		elif event.is_action_pressed("ui_right"):        # left to switch context to the left
			if not try_select_nearest_card(selection_position, Vector2.RIGHT, true):
				if not focus_stickies:
					if current_context == NAVIGATE:
						focus_stickies = true
					elif current_context == ASSIGN:
						sticky_note_container.get_children()[current_sticky_note_id].reclaim_sticky_note()
						current_context = NAVIGATE
			get_viewport().set_input_as_handled()
			
		elif event.is_action_pressed("ui_left"):       # right to switch context to the right
			print(try_select_nearest_card(selection_position, Vector2.LEFT))
			if focus_stickies:
				if current_context == NAVIGATE:
					focus_stickies = false
				elif current_context == ASSIGN:
					current_context = NAVIGATE
			get_viewport().set_input_as_handled()
			
		elif event.is_action_pressed("ui_accept"):              # select the selected note it
			if current_context == ASSIGN:
				if not dropzone.get_child(current_dropzone_id) is Card: return
				var card:Card = dropzone.get_child(current_dropzone_id)
				var sticky: StickyNote = currently_active_node if not focus_stickies else sticky_note_container.get_child(current_sticky_note_id).attached_sticky_note
				
				if card.has_sticky_note_attached():
					currently_active_node = card.exchange_sticky_note_with(sticky)
					focus_stickies = false
					if not try_select_nearest_empty_card(currently_active_node.global_position):
						current_dropzone_id = find_first_free_card()
				else:
					card.attach_sticky_note(sticky)
					current_context = NAVIGATE
					for panel: StickyNotePanel in sticky_note_container.get_children():
						panel.clear_if_empty()
					if not try_select_nearest_empty_card(currently_active_node.global_position):
						current_dropzone_id = find_first_free_card()
					check_board_comnpletion()
					if focus_stickies:
						focus_stickies = false
						current_dropzone_id = current_dropzone_id
					else:
						focus_stickies = true
						current_sticky_note_id -= 1
					
			elif current_context == NAVIGATE:
				if focus_stickies:
					# this is kind of redundant, but a safety feature to avoid active node and index misaligning.
					currently_active_node = sticky_note_container.get_children()[current_sticky_note_id].get_child(0)
					current_context = ASSIGN
					focus_stickies = false
					if not try_select_nearest_empty_card(currently_active_node.global_position):
						current_dropzone_id = find_first_free_card()
				else:
					if currently_active_node is StickyNote:
						add_sticky_note(currently_active_node)
						current_sticky_note_id = sticky_note_container.get_child_count()-1
						current_context = ASSIGN
						focus_stickies = false
					if currently_active_node is Card:
						if currently_active_node.has_sticky_note_attached():
							currently_active_node = currently_active_node.remove_sticky_note()
							add_sticky_note(currently_active_node)
							current_sticky_note_id = sticky_note_container.get_child_count()-1
							focus_stickies = true
						else:
							if not is_board_complete():
								current_context = ASSIGN
								focus_stickies = true
								current_sticky_note_id = current_sticky_note_id

#				
#			else:
#				if current_context == ASSIGN:
#					if not dropzone.get_child(current_dropzone_id) is Card: return
#					var card:Card = dropzone.get_child(current_dropzone_id)
#			
#			if dropzone.get_child(current_dropzone_id) is Card:
#				var card:Card = dropzone.get_child(current_dropzone_id)
#				if current_context == ASSIGN:     # to assign it to a card
#					if card.has_sticky_note_attached():
#						currently_active_node = card.exchange_sticky_note_with(currently_active_node)
#						if not try_select_nearest_empty_card(currently_active_node.global_position):
#							current_dropzone_id = find_first_free_card()
#					else:
#						card.attach_sticky_note(sticky_note_container.get_child(current_sticky_note_id).attached_sticky_note)
#						current_context = NAVIGATE
#						for panel: StickyNotePanel in sticky_note_container.get_children():
#							panel.clear_if_empty()
#						focus_stickies = not focus_stickies
#						if not try_select_nearest_empty_card(currently_active_node.global_position):
#							current_dropzone_id = find_first_free_card()
#						check_board_comnpletion()
#						return
#				else:
#					if !focus_stickies and card.has_sticky_note_attached():
#						pass
#					else:
#						if not try_select_nearest_empty_card(currently_active_node.global_position):
#							current_dropzone_id = find_first_free_card()
#					
#					current_context = ASSIGN
#					focus_stickies = !focus_stickies
#					if focus_stickies:
#						current_sticky_note_id = current_sticky_note_id
#					else:
#						current_dropzone_id = current_dropzone_id
#			elif dropzone.get_child(current_dropzone_id) is StickyNote:
#				if currently_active_node is StickyNote:
#					currently_active_node = dropzone.get_child(current_dropzone_id)
#					focus_stickies = false
#					current_context = ASSIGN
#					current_dropzone_id += 1
#					currently_active_node.is_dragable = false
#					currently_active_node.z_index = 1
			get_viewport().set_input_as_handled()

# move the note it so it floats next to the card where it should be attached
func _select_card_for_assigning(sticky_note: Area2D, card: Area2D):
	sticky_note.tween_transform_to(card.get_child(3).global_position)

func on_scene_skipped(i: int):
	mementos_collected += i

func claim_focus():
	State.pass_stage_to(self)

func find_first_free_card() -> int:
	for i in range(dropzone.get_child_count()):
		# start searching at the current location, use modulo to avoid getting out of array bounds
		if !dropzone.get_child((i+current_dropzone_id)%dropzone.get_child_count()).has_sticky_note_attached():
			return (i+current_dropzone_id)%dropzone.get_child_count()
	return -1

func on_sticky_panel_cleared(at_id: int):
	if current_sticky_note_id == at_id:
		current_sticky_note_id += 1
	if current_sticky_note_id == sticky_note_container.get_child_count()-1:
		if current_sticky_note_id-1 != at_id:
			current_sticky_note_id -= 1
		else:
			current_sticky_note_id += 1

func get_save_dict() -> Dictionary:
	var cards: Dictionary = {}
	var stickies: Dictionary = {}
	var randoms: Array[StringName]
	
	for child in dropzone.get_children():
		if child is Card:
			# Save position of Card.
			cards[child.name] = child.transform.origin
			if child.picked_random:
				randoms.append(child.name)
			
			if child.has_sticky_note_attached():
				# Saves Card Name as position of it's children.
				stickies[child.get_attached_sticky_note().name] = child.name
				if child.get_attached_sticky_note().picked_random:
					randoms.append(child.get_attached_sticky_note().name)
		
		elif child is StickyNote:
			# Save position of StickyNote.
			cards[child.name] = child.transform.origin
	
	for child in sticky_note_container.get_children():
		if child is StickyNotePanel:
			# Saves all collected Stickies that are not on board.
			stickies[child.attached_sticky_note.name] = -1
	return {
		"cards": cards,
		"stickies": stickies,
		"randoms": randoms
	}


func initialise_from_save(savegame: SaveGame):
	last_save_dict = savegame.board_state.duplicate()
	if savegame.board_state == {}: return
	rebuild_from_savedict(savegame.board_state)
	
func rebuild_from_savedict(board_state:Dictionary):
	var cards: Dictionary
	if board_state["cards"] != {} : 
		cards = board_state["cards"]
	var stickies: Dictionary
	if board_state["stickies"] != {} : 
		stickies = board_state["stickies"]
	var randoms: Array[StringName]
	if board_state["randoms"] != [] : 
		randoms = board_state["randoms"]
	
	if cards == null and stickies == null: return
	
	var all_cards: Array[StringName]
	for card_name: StringName in cards.keys():
		all_cards.append(card_name)
	for card_name: StringName in stickies.keys():
		all_cards.append(card_name)
	var card_pile = HardCards.get_cards_by_name_array(all_cards)
	
	for card:Card in card_pile["cards"]:
		add_card(card, false)
		card.transform.origin = cards[card.name]# Replacing position reference with card reference! Needed in next loop.
		cards[card.name] = card
		text_recovery[card.name] = card.text
		card.picked_random = randoms.has( card.card_id )
	for sticky:StickyNote in card_pile["sticky_notes"]:
		text_recovery[sticky.name] = sticky.text
		if stickies[sticky.name] is int:
			if stickies[sticky.name] == -1:
				add_sticky_note(sticky, false)
		elif stickies[sticky.name] is String:
			cards[stickies[sticky.name]].attach_sticky_note(sticky)
		else:
			insert_area(dropzone, sticky)
			sticky.transform.origin = stickies[sticky.name]
		sticky.picked_random = randoms.has( sticky.sticky_id )

func validate_board():
	return
	if current_context == NAVIGATE:
	
		var needs_rebuild = false
		for node in dropzone.get_children():
			if node is Card:
				match validate_card(node):
					Error.OUT_OF_BOUNDS:
						node.position = last_save_dict[node.name]
					Error.ILLEGAL_STATE:
						needs_rebuild = true
			if node is StickyNote:
				match validate_sticky(node):
					Error.OUT_OF_BOUNDS:
						node.position = last_save_dict[node.name]
					Error.ILLEGAL_STATE:
						needs_rebuild = true
		for panel:StickyNotePanel in sticky_note_container.get_children():
			if panel.attached_sticky_note != null:
				match validate_sticky(panel.attached_sticky_note):
					Error.OUT_OF_BOUNDS:
						panel.attached_sticky_note.position = panel.ancor_position
					Error.ILLEGAL_STATE:
						needs_rebuild = true

		# FIXME: currently, illegal temporary state exists a lot and needs to be rectified before this can be trusted.
		if needs_rebuild and false:
			
			for child in dropzone.get_children(): child.free()
			for child in sticky_note_container.get_children(): child.free()
			
			rebuild_from_savedict(last_save_dict)
			
			current_dropzone_id = 0
			current_sticky_note_id = 0
			focus_stickies = false
			current_context = NAVIGATE
		else:
			last_save_dict = get_save_dict()

func validate_sticky(note: StickyNote) -> CardBoard.Error:
	if not get_viewport_rect().has_point(note.get_global_transform().origin):
		return Error.OUT_OF_BOUNDS
	if note.attached_to is StickyNotePanel:
		if note.position != note.attached_to.ancor_position:
			return Error.OUT_OF_BOUNDS
	if (note.on_board and not is_in_dropzone(note)):
		return Error.ILLEGAL_STATE
	if not ((note.attached_to == self and dropzone.get_children().has(note)) or note.attached_to == note.get_parent()) or note.shift_tween != null:
		return Error.ILLEGAL_STATE
	
	return Error.OK

func validate_card(card: Card) -> CardBoard.Error:
	if not is_in_dropzone(card):
		return Error.OUT_OF_BOUNDS
	if card.get_attached_sticky_note() != card.current_sticky_note:
		#push_error("Card %s claims to have %s as current sticky note but has %s attached." % [card.name, card.current_sticky_note, card.get_attached_sticky_note()])
		return Error.ILLEGAL_STATE
	if not card.owner == self:
		return Error.ILLEGAL_STATE
	return CardBoard.Error.OK


func try_select_nearest_card(from: Vector2, towards: Vector2, include_stickies: bool = false) -> bool:
	var selection_transform = Transform2D(0, from).looking_at(from+towards)
	
	var scores: Dictionary[int, Area2D] = {-1: null}
	for child:Area2D in dropzone.get_children():
		if not (child is StickyNote and current_context == ASSIGN):
			scores[get_distance_score(child.global_position, selection_transform)] = child
	scores.erase(-1)
	scores.sort()
	
	if include_stickies:
		var panel_scores: Dictionary[int, StickyNotePanel] = {-1: null}
		for child:StickyNotePanel in sticky_note_container.get_children():
			if not child.is_empty():
				panel_scores[get_distance_score(child.attached_sticky_note.global_position, selection_transform)] = child
		panel_scores.erase(-1)
		panel_scores.sort()
		
		if panel_scores != {}:
			if scores != {}:
				if panel_scores.keys()[0] < scores.keys()[0]:
					if current_context == ASSIGN: return false
					current_sticky_note_id = sticky_note_container.get_children().find(panel_scores.values()[0])
					focus_stickies = true
					return true
			else:
				if current_context == ASSIGN: return false
				current_sticky_note_id = sticky_note_container.get_children().find(panel_scores.values()[0])
				focus_stickies = true
				return true
	
	
	if scores != {}:
		current_dropzone_id = dropzone.get_children().find(scores.values()[0])
		return true
	return false

func try_select_nearest_empty_card(from: Vector2) -> bool:
	var scores: Dictionary[int, Area2D] = {}
	
	for card in dropzone.get_children():
		if card is Card:
			if not card.has_sticky_note_attached():
				scores[int((from-card.global_position).length())] = card
	
	scores.sort()
	
	if scores != {}:
		current_dropzone_id = dropzone.get_children().find(scores.values()[0])
		return true
	return false

func get_distance_score(from: Vector2, to: Transform2D) -> int:
	var diff = from * to
	var dir = diff.normalized()
	if dir.x > 0.5 and diff.length() > 0:
		return int((abs(dir.y) + 0.5) * diff.length())
	else:
		return -1