class_name Deck
extends Resource

@export var id: String = ""
@export var name: String = "New Deck"
@export var description: String = ""
@export var cards: Array[Flashcard] = []

@export var author_id: String = "local"
@export var author_name: String = "Local User"
@export var author_created_at: String = ""

@export var created_at: String = ""
@export var updated_at: String = ""
@export var color_theme: Color = Color.CORNFLOWER_BLUE
@export var icon: String = ""
@export var tags: Array[String] = []
@export var is_public: bool = false
@export var download_count: int = 0
@export var rating: float = 0.0

func _init() -> void:
	if id == "":
		id = _generate_uuid()
		var now = Time.get_datetime_string_from_system(true, true) + "Z"
		created_at = now
		updated_at = now
		author_created_at = now

func to_dict() -> Dictionary:
	var cards_data: Array = []
	for card in cards:
		cards_data.append(card.to_dict())

	return {
		"version": "1.0",
		"deck": {
			"id": id,
			"name": name,
			"description": description,
			"author": {
				"id": author_id,
				"name": author_name,
				"created_at": author_created_at
			},
			"metadata": {
				"created_at": created_at,
				"updated_at": updated_at,
				"color_theme": color_theme.to_html(),
				"icon": icon,
				"tags": tags.duplicate(),
				"is_public": is_public,
				"download_count": download_count,
				"rating": rating
			},
			"cards": cards_data
		}
	}

func from_dict(data: Dictionary) -> void:
	var deck_data = data.get("deck", data)

	id = deck_data.get("id", _generate_uuid())
	name = deck_data.get("name", "New Deck")
	description = deck_data.get("description", "")

	var author = deck_data.get("author", {})
	author_id = author.get("id", "local")
	author_name = author.get("name", "Local User")
	author_created_at = author.get("created_at", Time.get_datetime_string_from_system(true, true) + "Z")

	var metadata = deck_data.get("metadata", {})
	created_at = metadata.get("created_at", Time.get_datetime_string_from_system(true, true) + "Z")
	updated_at = metadata.get("updated_at", created_at)
	color_theme = Color.from_string(metadata.get("color_theme", "#6495ED"), Color.CORNFLOWER_BLUE)
	icon = metadata.get("icon", "")
	tags.assign(metadata.get("tags", []))
	is_public = metadata.get("is_public", false)
	download_count = metadata.get("download_count", 0)
	rating = metadata.get("rating", 0.0)

	cards.clear()
	var cards_data = deck_data.get("cards", [])
	for card_data in cards_data:
		var card = Flashcard.new()
		card.from_dict(card_data)
		cards.append(card)

func add_card(card: Flashcard) -> void:
	cards.append(card)
	_update_modified_date()

func remove_card(card_id: String) -> bool:
	for i in range(cards.size()):
		if cards[i].id == card_id:
			cards.remove_at(i)
			_update_modified_date()
			return true
	return false

func get_card_by_id(card_id: String) -> Flashcard:
	for card in cards:
		if card.id == card_id:
			return card
	return null

func get_card_count() -> int:
	return cards.size()

func _update_modified_date() -> void:
	updated_at = Time.get_datetime_string_from_system(true, true) + "Z"

func _generate_uuid() -> String:
	return "%x%x-%x-%x-%x-%x%x%x" % [
		randi(), randi(), randi(), randi(),
		randi(), randi(), randi(), randi()
	]