@tool
class_name SaveGameHandle extends CenterContainer

signal picked(save_game: SaveGame)

var has_stage: bool = false:
	set(stage):
		has_stage = stage
		visible = stage
		save_buttons[0].grab_focus()

@export var saves: Array[SaveGame]
var save_buttons: Array[SaveGameDisplay]
@export var update_display: bool:
	set(value):
		load_games()
var scroll_container: ScrollContainer

var override_save_slot: bool = false

func _validate_property(property: Dictionary) -> void:
	if property.name == "saves":
		property.usage = PROPERTY_USAGE_READ_ONLY + PROPERTY_USAGE_SCRIPT_VARIABLE + PROPERTY_USAGE_EDITOR


func _ready() -> void:
	var dir = DirAccess.open(State.user_saves_path)
	if DirAccess.get_open_error() != OK:
		printerr("Error while opening User Save Directory: %s" % error_string(DirAccess.get_open_error()))
	# Invalid Error being raised when Directory does not exist.
	if DirAccess.get_open_error() == ERR_INVALID_PARAMETER:
		dir = DirAccess.open("user://")
		dir.make_dir_recursive(State.user_saves_path)
	load_games()
	for i in range(save_buttons.size()):
		save_buttons[i].pressed.connect(func(): picked.emit(saves[i]))

func load_games():
	saves = []
	var save_game_dir := DirAccess.open(State.user_saves_path)
	var filepaths: PackedStringArray = save_game_dir.get_files()
	
	for path in filepaths:
		if path.ends_with(".json"):
			saves.append(SaveGame.new("%s/%s" % [State.user_saves_path, path.get_basename()]))
	
	saves.append(SaveGame.new())
	
	#purging the current state
	save_buttons = []
	if scroll_container != null:
		scroll_container.queue_free()
	
	scroll_container = ScrollContainer.new()
	
	scroll_container.horizontal_scroll_mode = ScrollContainer.SCROLL_MODE_DISABLED
	scroll_container.custom_minimum_size = Vector2(0, ProjectSettings.get_setting("display/window/size/viewport_height") - 256)
	add_child(scroll_container)
	
	var save_box := VBoxContainer.new()
	save_box.add_theme_constant_override("separation", 16)
	scroll_container.add_child(save_box)
	
	for i in range(saves.size()):
		var new_button := SaveGameDisplay.new(saves[i], i+1)
		save_box.add_child(new_button)
		save_buttons.append(new_button)
		new_button.pressed.connect(func(): _on_game_picked(i))

func _on_game_picked(id: int):
	if override_save_slot:
		if saves[id].current_room == 0:
			picked.emit(id)
		else:
			$Popup.show()
			
	else:
		picked.emit(id)

# This function is called when the user us supposed to choose a slot to load or create a new game.
func pick_save_slot(create_new_game: bool):
	if saves.size() == 1:
		picked.emit(saves[0])
	else:
		State.take_stage(self)
		self.override_save_slot = create_new_game

func get_most_recent_save() -> SaveGame:
	var most_recent_time := 0.0
	var most_recent_index:int = 0
	for i in range(saves.size()):
		if saves[i].last_saved > most_recent_time and not saves[i].current_room == 0:
			most_recent_index = i
			most_recent_time = saves[i].last_saved
			
	return saves[most_recent_index] if most_recent_time > 0 else SaveGame.new()
	
func has_existing_saves() -> bool:
	return saves.size() > 1

func _input(event: InputEvent) -> void:
	if event.is_action_pressed("ui_cancel"):
		State.leave_stage(self)