import 'package:please_pay_me/data/models/json.dart';

class Expense {
  const Expense({
    required this.id,
    required this.budgetId,
    required this.amount,
    required this.spentAt,
    this.note,
  });

  factory Expense.fromJson(Map<String, dynamic> json) {
    return Expense(
      id: asInt(json['id']),
      budgetId: asInt(json['budget_id']),
      amount: asDouble(json['amount']),
      spentAt: asDate(json['spent_at']),
      note: asStringOrNull(json['note']),
    );
  }

  final int id;
  final int budgetId;
  final double amount;
  final DateTime spentAt;
  final String? note;
}

class ExpensesPage {
  const ExpensesPage({
    required this.page,
    required this.totalPages,
    required this.totalCount,
    required this.pageSize,
    required this.totalSum,
    required this.items,
    this.budgetId,
  });

  factory ExpensesPage.fromJson(Map<String, dynamic> json) {
    return ExpensesPage(
      page: asInt(json['page'], fallback: 1),
      totalPages: asInt(json['total_pages'], fallback: 1),
      totalCount: asInt(json['total_count']),
      pageSize: asInt(json['page_size'], fallback: 20),
      totalSum: asDouble(json['total_sum']),
      budgetId: json['budget_id'] == null ? null : asInt(json['budget_id']),
      items: asList(json['items']).map(Expense.fromJson).toList(),
    );
  }

  static const empty = ExpensesPage(
    page: 1,
    totalPages: 1,
    totalCount: 0,
    pageSize: 20,
    totalSum: 0,
    items: [],
  );

  final int page;
  final int totalPages;
  final int totalCount;
  final int pageSize;
  final double totalSum;
  final int? budgetId;
  final List<Expense> items;

  bool get hasMore => page < totalPages;

  ExpensesPage copyWithItems(List<Expense> items, {int? page}) {
    return ExpensesPage(
      page: page ?? this.page,
      totalPages: totalPages,
      totalCount: totalCount,
      pageSize: pageSize,
      totalSum: totalSum,
      budgetId: budgetId,
      items: items,
    );
  }
}