worker/lib/core/constants/app_constants.dart

/// Application-level constants and configurations
///
/// This file contains app metadata, loyalty tier definitions, pagination settings,
/// and other application-wide configuration values.
library;

// ============================================================================
// Loyalty Member Tiers
// ============================================================================

/// Membership tier levels in the loyalty program
///
/// Ordered from lowest to highest:
/// - [MemberTier.gold]: Entry level (0-999 points)
/// - [MemberTier.platinum]: Mid level (1000-4999 points)
/// - [MemberTier.diamond]: Premium level (5000+ points)
enum MemberTier {
  /// Gold tier - Entry level membership
  /// Requirements: 0-999 points
  /// Benefits: 1x points multiplier, basic discounts
  gold,

  /// Platinum tier - Mid level membership
  /// Requirements: 1000-4999 points
  /// Benefits: 1.5x points multiplier, priority support, special offers
  platinum,

  /// Diamond tier - Premium membership
  /// Requirements: 5000+ points
  /// Benefits: 2x points multiplier, exclusive rewards, VIP support, early access
  diamond,
}

/// Extension methods for MemberTier enum
extension MemberTierExtension on MemberTier {
  /// Get display name for the tier
  String get displayName {
    switch (this) {
      case MemberTier.gold:
        return 'Gold';
      case MemberTier.platinum:
        return 'Platinum';
      case MemberTier.diamond:
        return 'Diamond';
    }
  }

  /// Get Vietnamese display name
  String get displayNameVi {
    switch (this) {
      case MemberTier.gold:
        return 'Vàng';
      case MemberTier.platinum:
        return 'Bạc';
      case MemberTier.diamond:
        return 'Kim Cương';
    }
  }

  /// Get points multiplier for earning rewards
  double get pointsMultiplier {
    switch (this) {
      case MemberTier.gold:
        return 1.0;
      case MemberTier.platinum:
        return 1.5;
      case MemberTier.diamond:
        return 2.0;
    }
  }

  /// Get minimum points required for this tier
  int get minPoints {
    switch (this) {
      case MemberTier.gold:
        return 0;
      case MemberTier.platinum:
        return 1000;
      case MemberTier.diamond:
        return 5000;
    }
  }

  /// Get maximum points for this tier (null for diamond = unlimited)
  int? get maxPoints {
    switch (this) {
      case MemberTier.gold:
        return 999;
      case MemberTier.platinum:
        return 4999;
      case MemberTier.diamond:
        return null; // Unlimited
    }
  }

  /// Get next tier (null if already at highest tier)
  MemberTier? get nextTier {
    switch (this) {
      case MemberTier.gold:
        return MemberTier.platinum;
      case MemberTier.platinum:
        return MemberTier.diamond;
      case MemberTier.diamond:
        return null; // Already at top
    }
  }

  /// Get tier from points value
  static MemberTier fromPoints(int points) {
    if (points >= MemberTier.diamond.minPoints) {
      return MemberTier.diamond;
    } else if (points >= MemberTier.platinum.minPoints) {
      return MemberTier.platinum;
    } else {
      return MemberTier.gold;
    }
  }
}

// ============================================================================
// User Types
// ============================================================================

/// Types of users in the Worker app
enum UserType {
  /// Contractor - Construction project managers (Thầu thợ)
  contractor,

  /// Architect - Design professionals (Kiến trúc sư)
  architect,

  /// Distributor - Product resellers (Đại lý phân phối)
  distributor,

  /// Broker - Real estate and construction brokers (Môi giới)
  broker,
}

/// Extension methods for UserType enum
extension UserTypeExtension on UserType {
  /// Get display name
  String get displayName {
    switch (this) {
      case UserType.contractor:
        return 'Contractor';
      case UserType.architect:
        return 'Architect';
      case UserType.distributor:
        return 'Distributor';
      case UserType.broker:
        return 'Broker';
    }
  }

  /// Get Vietnamese display name
  String get displayNameVi {
    switch (this) {
      case UserType.contractor:
        return 'Thầu thợ';
      case UserType.architect:
        return 'Kiến trúc sư';
      case UserType.distributor:
        return 'Đại lý phân phối';
      case UserType.broker:
        return 'Môi giới';
    }
  }
}

// ============================================================================
// Order Status
// ============================================================================

/// Order lifecycle status
enum OrderStatus {
  /// Order placed, awaiting processing
  pending,

  /// Order is being prepared
  processing,

  /// Order is out for delivery
  shipping,

  /// Order delivered successfully
  completed,

  /// Order cancelled by user or system
  cancelled,
}

/// Extension methods for OrderStatus enum
extension OrderStatusExtension on OrderStatus {
  String get displayName {
    switch (this) {
      case OrderStatus.pending:
        return 'Pending';
      case OrderStatus.processing:
        return 'Processing';
      case OrderStatus.shipping:
        return 'Shipping';
      case OrderStatus.completed:
        return 'Completed';
      case OrderStatus.cancelled:
        return 'Cancelled';
    }
  }

  String get displayNameVi {
    switch (this) {
      case OrderStatus.pending:
        return 'Chờ xử lý';
      case OrderStatus.processing:
        return 'Đang xử lý';
      case OrderStatus.shipping:
        return 'Đang giao';
      case OrderStatus.completed:
        return 'Hoàn thành';
      case OrderStatus.cancelled:
        return 'Đã hủy';
    }
  }
}

// ============================================================================
// Project Status
// ============================================================================

/// Construction project lifecycle status
enum ProjectStatus {
  /// Project in planning phase
  planning,

  /// Project actively in progress
  inProgress,

  /// Project completed
  completed,

  /// Project on hold
  onHold,

  /// Project cancelled
  cancelled,
}

extension ProjectStatusExtension on ProjectStatus {
  String get displayName {
    switch (this) {
      case ProjectStatus.planning:
        return 'Planning';
      case ProjectStatus.inProgress:
        return 'In Progress';
      case ProjectStatus.completed:
        return 'Completed';
      case ProjectStatus.onHold:
        return 'On Hold';
      case ProjectStatus.cancelled:
        return 'Cancelled';
    }
  }

  String get displayNameVi {
    switch (this) {
      case ProjectStatus.planning:
        return 'Lên kế hoạch';
      case ProjectStatus.inProgress:
        return 'Đang thực hiện';
      case ProjectStatus.completed:
        return 'Hoàn thành';
      case ProjectStatus.onHold:
        return 'Tạm dừng';
      case ProjectStatus.cancelled:
        return 'Đã hủy';
    }
  }
}

// ============================================================================
// Project Types
// ============================================================================

/// Types of construction projects
enum ProjectType {
  /// Residential construction
  residential,

  /// Commercial construction
  commercial,

  /// Industrial construction
  industrial,
}

extension ProjectTypeExtension on ProjectType {
  String get displayName {
    switch (this) {
      case ProjectType.residential:
        return 'Residential';
      case ProjectType.commercial:
        return 'Commercial';
      case ProjectType.industrial:
        return 'Industrial';
    }
  }

  String get displayNameVi {
    switch (this) {
      case ProjectType.residential:
        return 'Dân dụng';
      case ProjectType.commercial:
        return 'Thương mại';
      case ProjectType.industrial:
        return 'Công nghiệp';
    }
  }
}

// ============================================================================
// App Metadata
// ============================================================================

/// Application constants
class AppConstants {
  // Private constructor to prevent instantiation
  AppConstants._();

  /// Application name
  static const String appName = 'Worker';

  /// Full application name
  static const String appFullName = 'Worker - EuroTile & Vasta Stone';

  /// Application version
  static const String appVersion = '1.0.0';

  /// Build number
  static const int buildNumber = 1;

  /// Company name
  static const String companyName = 'EuroTile & Vasta Stone';

  /// Support email
  static const String supportEmail = 'support@worker.example.com';

  /// Support phone number (Vietnamese format)
  static const String supportPhone = '1900 xxxx';

  /// Website URL
  static const String websiteUrl = 'https://worker.example.com';

  // ============================================================================
  // Pagination Settings
  // ============================================================================

  /// Default page size for paginated lists
  static const int defaultPageSize = 20;

  /// Products page size
  static const int productsPageSize = 20;

  /// Orders page size
  static const int ordersPageSize = 10;

  /// Projects page size
  static const int projectsPageSize = 15;

  /// Notifications page size
  static const int notificationsPageSize = 25;

  /// Points history page size
  static const int pointsHistoryPageSize = 20;

  /// Maximum items to load at once
  static const int maxPageSize = 100;

  // ============================================================================
  // Cache Settings
  // ============================================================================

  /// Cache duration for products (in hours)
  static const int productsCacheDuration = 24;

  /// Cache duration for user profile (in hours)
  static const int profileCacheDuration = 1;

  /// Cache duration for categories (in hours)
  static const int categoriesCacheDuration = 48;

  /// Maximum cache size (in MB)
  static const int maxCacheSize = 100;

  // ============================================================================
  // OTP Settings
  // ============================================================================

  /// OTP code length (6 digits)
  static const int otpLength = 6;

  /// OTP resend cooldown (in seconds)
  static const int otpResendCooldown = 60;

  /// OTP validity duration (in minutes)
  static const int otpValidityMinutes = 5;

  // ============================================================================
  // Referral Settings
  // ============================================================================

  /// Points earned per successful referral
  static const int pointsPerReferral = 100;

  /// Points earned by the referred user on signup
  static const int welcomeBonusPoints = 50;

  // ============================================================================
  // Order Settings
  // ============================================================================

  /// Minimum order amount (in VND)
  static const double minOrderAmount = 100000; // 100,000 VND

  /// Free shipping threshold (in VND)
  static const double freeShippingThreshold = 1000000; // 1,000,000 VND

  /// Standard shipping fee (in VND)
  static const double standardShippingFee = 30000; // 30,000 VND

  /// Maximum items per order
  static const int maxItemsPerOrder = 50;

  // ============================================================================
  // Image Settings
  // ============================================================================

  /// Maximum avatar size (in MB)
  static const int maxAvatarSize = 5;

  /// Maximum product image size (in MB)
  static const int maxProductImageSize = 3;

  /// Supported image formats
  static const List<String> supportedImageFormats = ['jpg', 'jpeg', 'png', 'webp'];

  /// Image quality for compression (0-100)
  static const int imageQuality = 85;

  // ============================================================================
  // Search Settings
  // ============================================================================

  /// Minimum search query length
  static const int minSearchLength = 2;

  /// Search debounce delay (in milliseconds)
  static const int searchDebounceMs = 500;

  /// Maximum search results
  static const int maxSearchResults = 50;

  // ============================================================================
  // Date & Time Settings
  // ============================================================================

  /// Default date format (Vietnamese: dd/MM/yyyy)
  static const String dateFormat = 'dd/MM/yyyy';

  /// Date time format
  static const String dateTimeFormat = 'dd/MM/yyyy HH:mm';

  /// Time format (24-hour)
  static const String timeFormat = 'HH:mm';

  /// Full date time format
  static const String fullDateTimeFormat = 'EEEE, dd MMMM yyyy HH:mm';

  // ============================================================================
  // Validation Settings
  // ============================================================================

  /// Minimum password length
  static const int minPasswordLength = 8;

  /// Maximum password length
  static const int maxPasswordLength = 50;

  /// Minimum name length
  static const int minNameLength = 2;

  /// Maximum name length
  static const int maxNameLength = 100;

  /// Vietnamese phone number regex pattern
  /// Matches: 0912345678, +84912345678, 84912345678
  static const String phoneRegexPattern = r'^(0|\+84|84)[3|5|7|8|9][0-9]{8}$';

  /// Email regex pattern
  static const String emailRegexPattern = r'^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$';

  // ============================================================================
  // Feature Flags
  // ============================================================================

  /// Enable dark mode
  static const bool enableDarkMode = true;

  /// Enable biometric authentication
  static const bool enableBiometric = true;

  /// Enable push notifications
  static const bool enablePushNotifications = true;

  /// Enable offline mode
  static const bool enableOfflineMode = true;

  /// Enable analytics
  static const bool enableAnalytics = true;

  /// Enable crash reporting
  static const bool enableCrashReporting = true;
}