import 'package:equatable/equatable.dart';
import '../../core/utils/unit_conversion_utils.dart';

class User extends Equatable {
  final String id;
  final String username;
  final String email;
  final String? avatarUrl;
  final String? bio;
  final bool isPublicProfile;
  final String? twitterHandle;
  final String? instagramHandle;
  final String? tiktokHandle;
  final String? websiteUrl;
  final DateTime? countdownStartDate;
  final DateTime? countdownEndDate;
  final Gender? gender;
  final DateTime? birthDate;
  final int? storedAge;
  final double? heightCm;
  final double? weightKg;
  final HeightUnit heightUnit;
  final WeightUnit weightUnit;
  final DateTime createdAt;
  final DateTime updatedAt;

  const User({
    required this.id,
    required this.username,
    required this.email,
    this.avatarUrl,
    this.bio,
    this.isPublicProfile = false,
    this.twitterHandle,
    this.instagramHandle,
    this.tiktokHandle,
    this.websiteUrl,
    this.countdownStartDate,
    this.countdownEndDate,
    this.gender,
    this.birthDate,
    this.storedAge,
    this.heightCm,
    this.weightKg,
    this.heightUnit = HeightUnit.metric,
    this.weightUnit = WeightUnit.metric,
    required this.createdAt,
    required this.updatedAt,
  });

  bool get hasCountdownStarted => countdownStartDate != null;
  
  bool get isCountdownActive {
    if (!hasCountdownStarted || countdownEndDate == null) return false;
    return DateTime.now().isBefore(countdownEndDate!);
  }

  int? get daysRemaining {
    if (!isCountdownActive) return null;
    return countdownEndDate!.difference(DateTime.now()).inDays;
  }

  int? get age {
    if (storedAge != null) return storedAge;
    if (birthDate == null) return null;
    return UnitConversionUtils.calculateAge(birthDate!);
  }

  String get formattedHeight {
    if (heightCm == null) return '';
    return UnitConversionUtils.formatHeight(heightCm!, heightUnit);
  }

  String get formattedWeight {
    if (weightKg == null) return '';
    return UnitConversionUtils.formatWeight(weightKg!, weightUnit);
  }

  double? get bmi {
    if (heightCm == null || weightKg == null) return null;
    return UnitConversionUtils.calculateBmi(weightKg!, heightCm!);
  }

  String get bmiCategory {
    final bmiValue = bmi;
    if (bmiValue == null) return '';
    return UnitConversionUtils.getBmiCategory(bmiValue);
  }

  User copyWith({
    String? id,
    String? username,
    String? email,
    String? avatarUrl,
    String? bio,
    bool? isPublicProfile,
    String? twitterHandle,
    String? instagramHandle,
    String? tiktokHandle,
    String? websiteUrl,
    DateTime? countdownStartDate,
    DateTime? countdownEndDate,
    Gender? gender,
    DateTime? birthDate,
    int? storedAge,
    double? heightCm,
    double? weightKg,
    HeightUnit? heightUnit,
    WeightUnit? weightUnit,
    DateTime? createdAt,
    DateTime? updatedAt,
  }) {
    return User(
      id: id ?? this.id,
      username: username ?? this.username,
      email: email ?? this.email,
      avatarUrl: avatarUrl ?? this.avatarUrl,
      bio: bio ?? this.bio,
      isPublicProfile: isPublicProfile ?? this.isPublicProfile,
      twitterHandle: twitterHandle ?? this.twitterHandle,
      instagramHandle: instagramHandle ?? this.instagramHandle,
      tiktokHandle: tiktokHandle ?? this.tiktokHandle,
      websiteUrl: websiteUrl ?? this.websiteUrl,
      countdownStartDate: countdownStartDate ?? this.countdownStartDate,
      countdownEndDate: countdownEndDate ?? this.countdownEndDate,
      gender: gender ?? this.gender,
      birthDate: birthDate ?? this.birthDate,
      storedAge: storedAge ?? this.storedAge,
      heightCm: heightCm ?? this.heightCm,
      weightKg: weightKg ?? this.weightKg,
      heightUnit: heightUnit ?? this.heightUnit,
      weightUnit: weightUnit ?? this.weightUnit,
      createdAt: createdAt ?? this.createdAt,
      updatedAt: updatedAt ?? this.updatedAt,
    );
  }

  @override
  List<Object?> get props => [
        id,
        username,
        email,
        avatarUrl,
        bio,
        isPublicProfile,
        twitterHandle,
        instagramHandle,
        tiktokHandle,
        websiteUrl,
        countdownStartDate,
        countdownEndDate,
        gender,
        birthDate,
        storedAge,
        heightCm,
        weightKg,
        heightUnit,
        weightUnit,
        createdAt,
        updatedAt,
      ];

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'username': username,
      'email': email,
      'avatar_url': avatarUrl,
      'bio': bio,
      'is_public_profile': isPublicProfile,
      'twitter_handle': twitterHandle,
      'instagram_handle': instagramHandle,
      'tiktok_handle': tiktokHandle,
      'website_url': websiteUrl,
      'countdown_start_date': countdownStartDate?.toIso8601String(),
      'countdown_end_date': countdownEndDate?.toIso8601String(),
      'gender': gender?.toDatabaseString(),
      'birth_date': birthDate?.toIso8601String().split('T').first,
      'age': storedAge,
      'height_cm': heightCm,
      'weight_kg': weightKg,
      'height_unit': heightUnit.code,
      'weight_unit': weightUnit.code,
      'created_at': createdAt.toIso8601String(),
      'updated_at': updatedAt.toIso8601String(),
    };
  }

  factory User.fromJson(Map<String, dynamic> json) {
    return User(
      id: json['id'] as String,
      username: json['username'] as String,
      email: json['email'] as String,
      avatarUrl: json['avatar_url'] as String?,
      bio: json['bio'] as String?,
      isPublicProfile: json['is_public_profile'] as bool? ?? false,
      twitterHandle: json['twitter_handle'] as String?,
      instagramHandle: json['instagram_handle'] as String?,
      tiktokHandle: json['tiktok_handle'] as String?,
      websiteUrl: json['website_url'] as String?,
      countdownStartDate: json['countdown_start_date'] != null
          ? DateTime.parse(json['countdown_start_date'] as String)
          : null,
      countdownEndDate: json['countdown_end_date'] != null
          ? DateTime.parse(json['countdown_end_date'] as String)
          : null,
      gender: json['gender'] != null ? Gender.fromString(json['gender'] as String) : null,
      birthDate: json['birth_date'] != null ? DateTime.parse(json['birth_date'] as String) : null,
      storedAge: json['age'] as int?,
      heightCm: json['height_cm'] as double?,
      weightKg: json['weight_kg'] as double?,
      heightUnit: json['height_unit'] != null ? 
        HeightUnit.values.firstWhere((unit) => unit.code == json['height_unit']) : HeightUnit.metric,
      weightUnit: json['weight_unit'] != null ? 
        WeightUnit.values.firstWhere((unit) => unit.code == json['weight_unit']) : WeightUnit.metric,
      createdAt: DateTime.parse(json['created_at'] as String),
      updatedAt: DateTime.parse(json['updated_at'] as String),
    );
  }
}