import 'package:currency_picker/currency_picker.dart';
import 'package:json_annotation/json_annotation.dart';
import 'package:prasule/api/category.dart';
import 'package:prasule/api/walletentry.dart';
part 'wallet.g.dart';

Currency _currencyFromJson(Map<String, dynamic> data) =>
    Currency.from(json: data);

/// Represents a single wallet
///
/// A wallet stores [WalletSingleEntry]s categorized under [WalletCategory]s
@JsonSerializable()
class Wallet {
  /// A wallet stores [WalletSingleEntry]s categorized under [WalletCategory]s
  Wallet(
      {required this.name,
      required this.currency,
      this.categories = const [],
      this.entries = const [],
      this.starterBalance = 0,});

  /// Connects generated fromJson function
  factory Wallet.fromJson(Map<String, dynamic> json) => _$WalletFromJson(json);

  /// Name of the wallet
  final String name;

  /// A list of available categories
  final List<WalletCategory> categories;

  /// List of saved entries
  final List<WalletSingleEntry> entries;

  /// The starting balance of the wallet
  ///
  /// Used to calculate current balance
  double starterBalance;

  /// Selected currency
  @JsonKey(fromJson: _currencyFromJson)
  final Currency currency;

  /// Connects generated toJson function
  Map<String, dynamic> toJson() => _$WalletToJson(this);

  /// Getter for the next unused unique number ID in the wallet's entry list
  int get nextId {
    var id = 1;
    while (entries.where((element) => element.id == id).isNotEmpty) {
      id++; // create unique ID
    }
    return id;
  }

  /// Empty wallet used for placeholders
  static final Wallet empty = Wallet(
    name: "Empty",
    currency: Currency.from(
      json: {
        "code": "USD",
        "name": "United States Dollar",
        "symbol": r"$",
        "flag": "USD",
        "decimal_digits": 2,
        "number": 840,
        "name_plural": "US dollars",
        "thousands_separator": ",",
        "decimal_separator": ".",
        "space_between_amount_and_symbol": false,
        "symbol_on_left": true,
      },
    ),
  );
}