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

class Budget {
  const Budget({
    required this.id,
    required this.userId,
    required this.name,
    required this.totalAmount,
    required this.startDate,
    required this.endDate,
    required this.currency,
    required this.isActive,
  });

  factory Budget.fromJson(Map<String, dynamic> json) {
    return Budget(
      id: asInt(json['id']),
      userId: asInt(json['user_id']),
      name: asString(json['name']),
      totalAmount: asDouble(json['total_amount']),
      startDate: asDate(json['start_date']),
      endDate: asDate(json['end_date']),
      currency: asString(json['currency'], fallback: 'RUB'),
      isActive: asBool(json['is_active']),
    );
  }

  final int id;
  final int userId;
  final String name;
  final double totalAmount;
  final DateTime startDate;
  final DateTime endDate;
  final String currency;
  final bool isActive;
}

/// Budget plus the server-computed daily envelope math.
class BudgetStatus {
  const BudgetStatus({
    required this.budget,
    required this.today,
    required this.daysLeft,
    required this.totalSpent,
    required this.remaining,
    required this.dailyLimit,
    required this.spentToday,
    required this.remainingToday,
    required this.isOverDaily,
    required this.isOverBudget,
    required this.isExpired,
    required this.selected,
  });

  factory BudgetStatus.fromJson(Map<String, dynamic> json) {
    return BudgetStatus(
      budget: Budget.fromJson(asMap(json['budget'])),
      today: asDate(json['today']),
      daysLeft: asInt(json['days_left']),
      totalSpent: asDouble(json['total_spent']),
      remaining: asDouble(json['remaining']),
      dailyLimit: asDouble(json['daily_limit']),
      spentToday: asDouble(json['spent_today']),
      remainingToday: asDouble(json['remaining_today']),
      isOverDaily: asBool(json['is_over_daily']),
      isOverBudget: asBool(json['is_over_budget']),
      isExpired: asBool(json['is_expired']),
      selected: asBool(json['selected']),
    );
  }

  final Budget budget;
  final DateTime today;
  final int daysLeft;
  final double totalSpent;
  final double remaining;
  final double dailyLimit;
  final double spentToday;
  final double remainingToday;
  final bool isOverDaily;
  final bool isOverBudget;
  final bool isExpired;
  final bool selected;

  /// 0..1 — share of the budget already spent.
  double get spentProgress {
    if (budget.totalAmount <= 0) return 0;
    return (totalSpent / budget.totalAmount).clamp(0.0, 1.0);
  }

  /// 0..1 — share of today's envelope already spent.
  double get dailyProgress {
    if (dailyLimit <= 0) return spentToday > 0 ? 1 : 0;
    return (spentToday / dailyLimit).clamp(0.0, 1.0);
  }
}

class BudgetsList {
  const BudgetsList({required this.items});

  factory BudgetsList.fromJson(Map<String, dynamic> json) {
    return BudgetsList(
      items: asList(json['items']).map(BudgetStatus.fromJson).toList(),
    );
  }

  final List<BudgetStatus> items;
}