import 'package:uuid/uuid.dart';

final DateTime now = DateTime.now();

enum TransaktionArt { monatlBeitrag, aufladung, einkauf, korrektur }

enum Unit { stueck, menge }

class Category {
  final String name;
  final String icon;
  const Category({required this.name, required this.icon});
}

class Transaction {
  int id = 0;
  int amount;
  TransaktionArt type;
  DateTime date;
  Basket? basket;
  String? description;
  Transaction(
      {required this.type,
      required this.amount,
      required this.date,
      this.description,
      this.basket});
}

class Product {
  final int id = 0;
  final String name;
  final Unit unit; //pro Kg oder Stück
  final double price;
  final double vat;
  final Category category;
  const Product(this.name, this.unit, this.price, this.vat, this.category);
}

class Basket {
  Map<Product, int> purchases;
  double price;
  String guid;
  Basket(this.purchases, this.price) : guid = const Uuid().v4();

  void addItem(Product product, int quantity) {
    if (purchases.containsKey(product)) {
      purchases.update(
          product, (existingQuantity) => existingQuantity + quantity);
    } else {
      purchases[product] = quantity;
    }
  }

  void removeItem(Product product) {
    purchases.remove(product);
  }
}

class SampleData {
  static const List<Category> categories = [
    Category(name: 'Obst und Gemüse', icon: '🍒'),
    Category(name: 'Kochen und Backen', icon: '🍝'),
    Category(name: 'Brot, Cerealien & Aufstriche', icon: '🍞'),
    Category(name: 'Getränke und Pfand', icon: '🫖'),
    Category(name: 'Drogerie und Haushalt', icon: '🧼'),
    Category(name: 'Öl, Soßen und Gewürze', icon: '🫚'),
    Category(name: 'Süßes und Knabbereien', icon: '🍪')
  ];

  static List<Product> products = [
    Product('Apfel', Unit.stueck, 0.23, 7, categories[0]),
    Product('Mehl', Unit.menge, 0.003, 19, categories[1]),
    Product('Brot', Unit.stueck, 1.23, 7, categories[2]),
    Product('Milch', Unit.stueck, 2.23, 3, categories[3]),
    Product('Zahnpasta', Unit.stueck, 0.23, 7, categories[4]),
    Product('Pfeffer', Unit.stueck, 0.23, 7, categories[5]),
    Product('Schokolade', Unit.menge, 0.23, 7, categories[6]),
    Product('Flaschenpfand', Unit.stueck, -0.15, 0, categories[3])
  ];

  //such a basket can not exist later. It is for testing purposes
  // when scrolling through a long basket
  static Basket basket = Basket({
    products[0]: 20,
    products[1]: 2200,
    products[2]: 2,
    products[3]: 1,
    products[4]: 1,
    products[5]: 2,
    products[6]: 222,
    products[0]: 20,
    products[1]: 2200,
    products[2]: 2,
    products[3]: 1,
    products[4]: 1,
    products[5]: 2,
    products[6]: 222
  }, 27.9);

  static Basket basket2 = Basket({
    products[0]: 22,
    products[1]: 2241,
    products[3]: 2,
    products[4]: 4,
    products[6]: 2,
    products[7]: 5,
  }, 34);

  static Basket basket3 = Basket({
    products[0]: 2,
    products[1]: 21,
    products[3]: 4,
    products[4]: 1,
    products[6]: 5,
  }, -1);

  List<Transaction> transactions = [
    Transaction(
      type: TransaktionArt.monatlBeitrag,
      amount: 0,
      date: now,
    ),
    Transaction(
      type: TransaktionArt.aufladung,
      amount: 2042,
      date: now,
    ),
    Transaction(
        type: TransaktionArt.einkauf,
        amount: -2442,
        date: now.subtract(const Duration(days: 2)),
        basket: basket),
    Transaction(
      type: TransaktionArt.korrektur,
      amount: 2332,
      date: now.subtract(const Duration(hours: 5)),
      description: 'Korrektur des Warenkorbs',
      basket: basket3,
    ),
    Transaction(
      type: TransaktionArt.monatlBeitrag,
      amount: 0,
      date: now,
    ),
    Transaction(
      type: TransaktionArt.aufladung,
      amount: 2042,
      date: now,
    ),
    Transaction(
        type: TransaktionArt.einkauf,
        amount: -2442,
        date: now.subtract(const Duration(days: 2)),
        basket: basket2),
    Transaction(
        type: TransaktionArt.korrektur,
        amount: 2332,
        date: now.subtract(const Duration(hours: 5)),
        description: 'Korrektur des FinanzAK'),
    Transaction(
      type: TransaktionArt.monatlBeitrag,
      amount: 0,
      date: now,
    ),
    Transaction(
      type: TransaktionArt.aufladung,
      amount: 2042,
      date: now,
    ),
    Transaction(
      type: TransaktionArt.einkauf,
      amount: -2442,
      date: now.subtract(const Duration(days: 2)),
      basket: basket,
    ),
    Transaction(
        type: TransaktionArt.korrektur,
        amount: 2332,
        date: now.subtract(const Duration(hours: 5)),
        description: 'Korrektur des Warenkorbs'),
    Transaction(
      type: TransaktionArt.monatlBeitrag,
      amount: 0,
      date: now,
    ),
    Transaction(
      type: TransaktionArt.aufladung,
      amount: 2042,
      date: now,
    ),
    Transaction(
        type: TransaktionArt.einkauf,
        amount: -2442,
        date: now.subtract(const Duration(days: 2)),
        basket: basket),
    Transaction(
        type: TransaktionArt.korrektur,
        amount: 2332,
        date: now.subtract(const Duration(hours: 5)),
        description: 'Korrektur des Warenkorbs'),
    Transaction(
      type: TransaktionArt.monatlBeitrag,
      amount: 0,
      date: now,
    ),
    Transaction(
      type: TransaktionArt.aufladung,
      amount: 2042,
      date: now,
    ),
    Transaction(
        type: TransaktionArt.einkauf,
        amount: -2442,
        date: now.subtract(const Duration(days: 2)),
        basket: basket2),
    Transaction(
        type: TransaktionArt.korrektur,
        amount: 2332,
        date: now.subtract(const Duration(hours: 5)),
        description: 'Korrektur des Warenkorbs'),
  ];
}