import 'package:flutter/material.dart';
import '../models/category.dart'; // Import the Category model for return types

// Helper class to manage category details (icon, color) based on name
class CategoryUtils {
  // Private map storing details for each predefined category name.
  // Using a record `({IconData icon, Color color})` for concise structure.
  // This map is mainly for initial data and potentially fallback display logic.
  // The actual icon/color for user-created categories will come from the database.
  // DEPRECATED: Rely on _stringToIconData and database color instead.
  // static final Map<String, ({IconData iconCode, Color colorCode})> _categoryDetails = { ... };

  // Default details to return if a category name is not found (e.g., deleted category).
  // DEPRECATED: Use getIconFromString and default color instead.
  // static final _defaultDetails = (iconCode: Icons.category_outlined, colorCode: Colors.grey.shade500);

  /// DEPRECATED: Returns the IconData and Color associated with a given category name (primarily for fallback).
  /// It's better to rely on data fetched directly from the database (CategoryDb).
  static ({Color colorCode, IconData iconCode}) getCategoryDetails(String categoryName) {
    // Fallback logic using the string-to-icon map and a default color
    final icon = getIconFromString(categoryName); // Use the reliable method
    // Find color from initial data if possible, otherwise default grey
    // This part is still weak, ideally color comes from DB.
    Color color = Colors.grey.shade500; // Default color
    // Quick check against some known initial names for color fallback
    if (categoryName == 'Groceries') color = Colors.green.shade400;
    if (categoryName == 'Subscriptions') color = Colors.orange.shade400;
    if (categoryName == 'Restaurant') color = Colors.red.shade400;
    if (categoryName == 'Shopping') color = Colors.blue.shade400;
    if (categoryName == 'Transport') color = Colors.purple.shade400;
    if (categoryName == 'Travel') color = Colors.cyan.shade400;
    if (categoryName == 'Utilities') color = Colors.teal.shade400; // Updated from home_outlined
    if (categoryName == 'Income') color = Colors.lightGreenAccent.shade700;

    return (colorCode: color, iconCode: icon);
  }

  /// DEPRECATED: Returns a `Category` object based on its name and amount (primarily for UI models like Pie Chart).
  /// Fetches icon/color details using `getCategoryDetails` as a fallback mechanism.
  /// Should be replaced by logic that uses CategoryDb data directly.
  static Category getCategoryByName(String name, double amount) {
     final details = getCategoryDetails(name);
     return Category(name, amount, details.colorCode, details.iconCode);
  }

  /// DEPRECATED: Returns a list of all predefined category names (excluding placeholders).
  /// Might be less useful now that categories are fully dynamic.
  static List<String> getAllCategoryNames() {
    // Return keys from _stringToIconData, excluding special ones
    return _stringToIconData.keys.where((key) =>
        key != 'help_outline' &&
        key != 'label_outline' &&
        key != 'attach_money' && // Exclude Income
        key != 'category_outlined' // Exclude Other/Default
    ).toList();
  }

  /// Converts a string icon name (like 'shopping_cart_outlined') to IconData.
  /// This map is crucial for displaying icons based on the string stored in the DB.
  static final Map<String, IconData> _stringToIconData = {
    // Existing Icons
    'shopping_cart_outlined': Icons.shopping_cart_outlined, // Groceries
    'subscriptions_outlined': Icons.subscriptions_outlined, // Subscriptions
    'restaurant_menu_outlined': Icons.restaurant_menu_outlined, // Restaurant
    'shopping_bag_outlined': Icons.shopping_bag_outlined, // Shopping
    'directions_bus_filled_outlined': Icons.directions_bus_filled_outlined, // Transport
    'flight_takeoff_outlined': Icons.flight_takeoff_outlined, // Travel
    'lightbulb_outline': Icons.lightbulb_outline, // Utilities (alternative)
    'local_hospital_outlined': Icons.local_hospital_outlined, // Health
    'movie_filter_outlined': Icons.movie_filter_outlined, // Entertainment
    'attach_money': Icons.attach_money, // Income (Special)
    'category_outlined': Icons.category_outlined, // Other/Default (Fallback)
    'label_outline': Icons.label_outline, // Placeholder (Internal)
    'help_outline': Icons.help_outline, // Placeholder/Error (Internal)
    'home_outlined': Icons.home_outlined, // Home/Rent/Mortgage/Utilities
    'pets_outlined': Icons.pets_outlined, // Pets
    'school_outlined': Icons.school_outlined, // Education/School
    'fitness_center_outlined': Icons.fitness_center_outlined, // Gym/Fitness
    'checkroom_outlined': Icons.checkroom_outlined, // Clothing
    'devices_other_outlined': Icons.devices_other_outlined, // Electronics
    'card_giftcard_outlined': Icons.card_giftcard_outlined, // Gifts
    'volunteer_activism_outlined': Icons.volunteer_activism_outlined, // Charity/Donations
    'receipt_long_outlined': Icons.receipt_long_outlined, // Bills/Receipts
    'savings_outlined': Icons.savings_outlined, // Savings/Investments
    'credit_card_outlined': Icons.credit_card_outlined, // Credit Card Payment
    'build_outlined': Icons.build_outlined, // Repairs/Maintenance
    'child_friendly_outlined': Icons.child_friendly_outlined, // Child Care
    'work_outline': Icons.work_outline, // Work related
    'book_outlined': Icons.book_outlined, // Books/Magazines
    'music_note_outlined': Icons.music_note_outlined, // Music
    'sports_esports_outlined': Icons.sports_esports_outlined, // Games/Hobbies
    'local_bar_outlined': Icons.local_bar_outlined, // Drinks/Bar
    'cake_outlined': Icons.cake_outlined, // Celebrations/Party
    'park_outlined': Icons.park_outlined, // Parks/Outdoors
    'science_outlined': Icons.science_outlined, // Science/Tech
    'palette_outlined': Icons.palette_outlined, // Art/Design
    'account_balance_outlined': Icons.account_balance_outlined, // Bank/Finance Fees
    'analytics_outlined': Icons.analytics_outlined, // Analysis/Reports (Maybe internal?)
    'apartment_outlined': Icons.apartment_outlined, // Rent/Mortgage (Alternative)
    'beach_access_outlined': Icons.beach_access_outlined, // Vacation/Beach
    'brush_outlined': Icons.brush_outlined, // Personal Care/Cosmetics
    'business_center_outlined': Icons.business_center_outlined, // Business Expenses
    'call_outlined': Icons.call_outlined, // Phone Bill
    'camera_alt_outlined': Icons.camera_alt_outlined, // Photography/Equipment
    'car_rental_outlined': Icons.car_rental_outlined, // Car Rental
    'car_repair_outlined': Icons.car_repair_outlined, // Car Repair
    'celebration_outlined': Icons.celebration_outlined, // Party/Events (Alternative)
    'computer_outlined': Icons.computer_outlined, // Computer/Software
    'construction_outlined': Icons.construction_outlined, // Home Improvement
    'cottage_outlined': Icons.cottage_outlined, // Vacation Home/Cottage
    'delivery_dining_outlined': Icons.delivery_dining_outlined, // Food Delivery
    'diamond_outlined': Icons.diamond_outlined, // Jewelry/Luxury
    'dry_cleaning_outlined': Icons.dry_cleaning_outlined, // Laundry/Dry Cleaning
    'electrical_services_outlined': Icons.electrical_services_outlined, // Electrician
    'emoji_events_outlined': Icons.emoji_events_outlined, // Awards/Competitions
    'fastfood_outlined': Icons.fastfood_outlined, // Fast Food
    'fax_outlined': Icons.fax_outlined, // Office Supplies (Maybe outdated?)
    'festival_outlined': Icons.festival_outlined, // Festivals/Events
    'fireplace_outlined': Icons.fireplace_outlined, // Heating/Fuel
    'flatware_outlined': Icons.flatware_outlined, // Kitchenware
    'gas_meter_outlined': Icons.gas_meter_outlined, // Gas Bill
    'gavel_outlined': Icons.gavel_outlined, // Legal Fees
    'grass_outlined': Icons.grass_outlined, // Gardening/Lawn Care
    'hardware_outlined': Icons.hardware_outlined, // Hardware Store
    'hearing_outlined': Icons.hearing_outlined, // Audio/Headphones
    'hiking_outlined': Icons.hiking_outlined, // Hiking/Outdoor Gear
    'icecream_outlined': Icons.icecream_outlined, // Ice Cream/Desserts
    'interests_outlined': Icons.interests_outlined, // Hobbies General
    'key_outlined': Icons.key_outlined, // Keys/Locks
    'liquor_outlined': Icons.liquor_outlined, // Alcohol
    'local_activity_outlined': Icons.local_activity_outlined, // Tickets/Events
    'local_atm_outlined': Icons.local_atm_outlined, // ATM Withdrawal (Maybe internal?)
    'local_convenience_store_outlined': Icons.local_convenience_store_outlined, // Convenience Store
    'local_florist_outlined': Icons.local_florist_outlined, // Flowers
    'local_gas_station_outlined': Icons.local_gas_station_outlined, // Gas/Fuel
    'local_laundry_service_outlined': Icons.local_laundry_service_outlined, // Laundry Service
    'local_mall_outlined': Icons.local_mall_outlined, // Mall Shopping
    'local_offer_outlined': Icons.local_offer_outlined, // Discounts/Sales/Coupons
    'local_parking_outlined': Icons.local_parking_outlined, // Parking Fees
    'local_pharmacy_outlined': Icons.local_pharmacy_outlined, // Pharmacy
    'local_pizza_outlined': Icons.local_pizza_outlined, // Pizza
    'local_shipping_outlined': Icons.local_shipping_outlined, // Shipping Costs
    'local_taxi_outlined': Icons.local_taxi_outlined, // Taxi/Rideshare
    'lunch_dining_outlined': Icons.lunch_dining_outlined, // Lunch
    'medication_outlined': Icons.medication_outlined, // Medication
    'museum_outlined': Icons.museum_outlined, // Museum/Exhibits
    'newspaper_outlined': Icons.newspaper_outlined, // Newspapers/Magazines
    'paid_outlined': Icons.paid_outlined, // Payments/Transfers (Maybe internal?)
    'pedal_bike_outlined': Icons.pedal_bike_outlined, // Cycling
    'plumbing_outlined': Icons.plumbing_outlined, // Plumber
    'ramen_dining_outlined': Icons.ramen_dining_outlined, // Noodles/Asian Food
    'recycling_outlined': Icons.recycling_outlined, // Recycling Fees
    'redeem_outlined': Icons.redeem_outlined, // Gifts Received/Redeemed (Maybe internal?)
    'request_quote_outlined': Icons.request_quote_outlined, // Invoices/Quotes (Maybe internal?)
    'roller_skating_outlined': Icons.roller_skating_outlined, // Skating
    'roofing_outlined': Icons.roofing_outlined, // Roofing Repair
    'room_service_outlined': Icons.room_service_outlined, // Hotel Service
    'shield_outlined': Icons.shield_outlined, // Insurance
    'skateboarding_outlined': Icons.skateboarding_outlined, // Skateboarding
    'smoking_rooms_outlined': Icons.smoking_rooms_outlined, // Tobacco
    'spa_outlined': Icons.spa_outlined, // Spa/Wellness
    'sports_bar_outlined': Icons.sports_bar_outlined, // Sports Bar
    'sports_basketball_outlined': Icons.sports_basketball_outlined, // Basketball
    'sports_football_outlined': Icons.sports_football_outlined, // Football
    'sports_golf_outlined': Icons.sports_golf_outlined, // Golf
    'sports_gymnastics_outlined': Icons.sports_gymnastics_outlined, // Gymnastics
    'sports_handball_outlined': Icons.sports_handball_outlined, // Handball
    'sports_hockey_outlined': Icons.sports_hockey_outlined, // Hockey
    'sports_kabaddi_outlined': Icons.sports_kabaddi_outlined, // Kabaddi
    'sports_mma_outlined': Icons.sports_mma_outlined, // MMA
    'sports_motorsports_outlined': Icons.sports_motorsports_outlined, // Motorsports
    'sports_soccer_outlined': Icons.sports_soccer_outlined, // Soccer
    'sports_tennis_outlined': Icons.sports_tennis_outlined, // Tennis
    'sports_volleyball_outlined': Icons.sports_volleyball_outlined, // Volleyball
    'stadium_outlined': Icons.stadium_outlined, // Stadium/Events
    'store_mall_directory_outlined': Icons.store_mall_directory_outlined, // Department Store
    'stroller_outlined': Icons.stroller_outlined, // Baby Supplies
    'subway_outlined': Icons.subway_outlined, // Subway/Metro
    'surfing_outlined': Icons.surfing_outlined, // Surfing
    'sync_alt_outlined': Icons.sync_alt_outlined, // Transfers (Maybe internal?)
    'theater_comedy_outlined': Icons.theater_comedy_outlined, // Comedy Club
    'theaters_outlined': Icons.theaters_outlined, // Cinema/Theater
    'toys_outlined': Icons.toys_outlined, // Toys
    'train_outlined': Icons.train_outlined, // Train Travel
    'tram_outlined': Icons.tram_outlined, // Tram
    'two_wheeler_outlined': Icons.two_wheeler_outlined, // Motorcycle/Scooter
    'vape_free_outlined': Icons.vape_free_outlined, // Vaping (quit)
    'vaping_rooms_outlined': Icons.vaping_rooms_outlined, // Vaping
    'videogame_asset_outlined': Icons.videogame_asset_outlined, // Video Games
    'water_drop_outlined': Icons.water_drop_outlined, // Water Bill
    'wifi_outlined': Icons.wifi_outlined, // Internet Bill
    'wine_bar_outlined': Icons.wine_bar_outlined, // Wine Bar
  };

  /// Returns the IconData corresponding to the given icon name string.
  /// If the `iconName` is not found or is null/empty, returns a default fallback icon (`Icons.help_outline`).
  static IconData getIconFromString(String? iconName) {
    if (iconName == null || iconName.isEmpty) {
      return Icons.help_outline; // Default for null or empty
    }
    return _stringToIconData[iconName] ?? Icons.help_outline; // Return default if not found in map
  }

  /// Returns a map of available icons for selection in UI (e.g., dropdowns, dialogs).
  /// Excludes placeholder/internal icons like 'help_outline', 'label_outline',
  /// 'category_outlined', and the special 'attach_money' (Income).
  static Map<String, IconData> getAvailableIcons() {
    final availableIcons = Map<String, IconData>.from(_stringToIconData);
    // Remove icons not intended for user selection as expense categories
    availableIcons.remove('help_outline'); // Internal fallback/error
    availableIcons.remove('label_outline'); // Internal placeholder
    availableIcons.remove('category_outlined'); // Internal generic fallback
    availableIcons.remove('attach_money'); // Reserved for Income type
    // Consider removing others if they represent internal states:
    // availableIcons.remove('sync_alt_outlined'); // Transfers?
    // availableIcons.remove('paid_outlined'); // Payments?
    // availableIcons.remove('local_atm_outlined'); // ATM?
    // availableIcons.remove('redeem_outlined'); // Gifts Received?
    // availableIcons.remove('request_quote_outlined'); // Invoices?
    // availableIcons.remove('analytics_outlined'); // Reports?
    return availableIcons;
  }

  /// List of available colors for category selection in UI.
  static const List<Color> availableColors = [
    // Primary Colors (Good starting points)
    Colors.red, Colors.pink, Colors.purple, Colors.deepPurple,
    Colors.indigo, Colors.blue, Colors.lightBlue, Colors.cyan,
    Colors.teal, Colors.green, Colors.lightGreen, Colors.lime,
    Colors.yellow, Colors.amber, Colors.orange, Colors.deepOrange,
    Colors.brown, Colors.grey, Colors.blueGrey,

    // Accent Colors (Brighter, use with care)
    Colors.redAccent, Colors.pinkAccent, Colors.purpleAccent, Colors.deepPurpleAccent,
    Colors.indigoAccent, Colors.blueAccent, Colors.lightBlueAccent, Colors.cyanAccent,
    Colors.tealAccent, Colors.greenAccent, Colors.limeAccent,
    Colors.yellowAccent, Colors.amberAccent, Colors.orangeAccent, Colors.deepOrangeAccent,

    // Shade variations (More subtle options)
    /*Colors.red.shade300, Colors.pink.shade200, Colors.purple.shade300,
    Colors.indigo.shade300, Colors.blue.shade300, Colors.lightBlue.shade300,
    Colors.cyan.shade300, Colors.teal.shade300, Colors.green.shade300,
    Colors.lightGreen.shade300, Colors.lime.shade300, Colors.yellow.shade600, // Darker yellow
    Colors.amber.shade300, Colors.orange.shade300, Colors.deepOrange.shade300,
    Colors.brown.shade300, Colors.grey.shade400, Colors.blueGrey.shade300,*/
  ];
}