import 'package:flutter/material.dart';
import '../shared/models/transaction.dart';

class AppColors {
  static const background = Color(0xFF0F0F14);
  static const surface = Color(0xFF1A1A24);
  static const accent = Color(0xFF7C6DED);
  static const income = Color(0xFF4CAF8C);
  static const expense = Color(0xFFE05C6B);
  static const textPrimary = Color(0xFFEEEEF5);
  static const textSecondary = Color(0xFF8888A0);
  static const divider = Color(0xFF2A2A38);
  static const warning = Color(0xFFFFB74D);

  static const lightBackground = Color(0xFFF5F5F7);
  static const lightSurface = Color(0xFFFFFFFF);
  static const lightTextPrimary = Color(0xFF1A1A24);
  static const lightTextSecondary = Color(0xFF6B6B80);
  static const lightDivider = Color(0xFFE0E0E8);
}

class AppCategories {
  static const expenseCategories = [
    'Food',
    'Transport',
    'Shopping',
    'Health',
    'Entertainment',
    'Other'
  ];

  static const incomeCategories = [
    'Salary',
    'Freelance',
    'Gift',
    'Investment',
    'Refund',
    'Other'
  ];

  static List<String> forType(TransactionType type) {
    return type == TransactionType.expense
        ? expenseCategories
        : incomeCategories;
  }

  static const icons = {
    'Food': Icons.restaurant_rounded,
    'Transport': Icons.directions_car_rounded,
    'Shopping': Icons.shopping_bag_rounded,
    'Health': Icons.favorite_rounded,
    'Entertainment': Icons.movie_rounded,
    'Salary': Icons.work_rounded,
    'Freelance': Icons.laptop_rounded,
    'Gift': Icons.card_giftcard_rounded,
    'Investment': Icons.trending_up_rounded,
    'Refund': Icons.money_rounded,
    'Other': Icons.category_rounded,
  };

  static const colors = {
    'Food': Color(0xFFFF8C69),
    'Transport': Color(0xFF69B4FF),
    'Shopping': Color(0xFFFFD369),
    'Health': Color(0xFF69FFB4),
    'Entertainment': Color(0xFFFF69B4),
    'Salary': Color(0xFF4CAF8C),
    'Freelance': Color(0xFF69FFB4),
    'Gift': Color(0xFFFFB469),
    'Investment': Color(0xFF69B4FF),
    'Refund': Color(0xFFB4FF69),
    'Other': Color(0xFFB469FF),
  };
}

enum AmountFormat { commasDot, spacesDot, plain }

extension AmountFormatExt on AmountFormat {
  String get label {
    switch (this) {
      case AmountFormat.commasDot: return '1,234,567.89';
      case AmountFormat.spacesDot: return '1 234 567.89';
      case AmountFormat.plain:     return '1234567.89';
    }
  }

  String get example {
    switch (this) {
      case AmountFormat.commasDot: return 'SYM 1,234.56';
      case AmountFormat.spacesDot: return 'SYM 1 234.56';
      case AmountFormat.plain:     return 'SYM 1234.56';
    }
  }

  String format(double amount) {
    switch (this) {
      case AmountFormat.commasDot:
        final parts = amount.toStringAsFixed(2).split('.');
        final intPart = parts[0].replaceAllMapped(
          RegExp(r'(\d)(?=(\d{3})+$)'), (m) => '${m[1]},');
        return '$intPart.${parts[1]}';
      case AmountFormat.spacesDot:
        final parts = amount.toStringAsFixed(2).split('.');
        final intPart = parts[0].replaceAllMapped(
          RegExp(r'(\d)(?=(\d{3})+$)'), (m) => '${m[1]} ');
        return '$intPart.${parts[1]}';
      case AmountFormat.plain:
        return amount.toStringAsFixed(2);
    }
  }
}

class CurrencyOption {
  final String symbol;
  final String name;
  final String code;

  const CurrencyOption({
    required this.symbol,
    required this.name,
    required this.code,
  });
}

class AppCurrencies {
  static const options = [
    CurrencyOption(symbol: '\$', name: 'US Dollar', code: 'USD'),
    CurrencyOption(symbol: '€', name: 'Euro', code: 'EUR'),
    CurrencyOption(symbol: '£', name: 'British Pound', code: 'GBP'),
    CurrencyOption(symbol: '', name: 'Belarusian Ruble', code: 'BYN'),
    CurrencyOption(symbol: '₽', name: 'Russian Ruble', code: 'RUB'),
    CurrencyOption(symbol: '₴', name: 'Ukrainian Hryvnia', code: 'UAH'),
  ];

  static CurrencyOption findBySymbol(String symbol) {
    return options.firstWhere(
      (c) => c.symbol == symbol,
      orElse: () => options.first,
    );
  }
}

/// `(code, textSymbol)` for pickers and conversion rows. BYN uses `''` — use BynSign in UI.
const List<(String, String)> kDisplayCurrencies = [
  ('USD', r'$'),
  ('EUR', '€'),
  ('BYN', ''),
  ('RUB', '₽'),
];