import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

class DestinationObject {
  const DestinationObject(
    this.label,
    this.icon,
    this.selectedIcon,
    this.pageWidget,
  );

  final String label;
  final Widget icon;
  final Widget selectedIcon;
  final Widget pageWidget;
}

class UserData {
  const UserData(this.username, this.fullName, this.userId, this.email);

  final String userId;
  final String username;
  final String fullName;
  final String email;
}

class AuthenticatedUserData extends UserData {
  const AuthenticatedUserData({
    required String userId,
    required String username,
    required String fullName,
    required String email,
    required this.accessToken,
  }) : super(username, fullName, userId, email);

  final String accessToken;
}

class HomepageStats {
  final double totalMileage;
  final List<YearlyMileage> yearlyMileage;
  final List<LocoSummary> topLocos;
  final List<LeaderboardEntry> leaderboard;
  final List<TripSummary> trips;
  final UserData? user;

  HomepageStats({
    required this.totalMileage,
    required this.yearlyMileage,
    required this.topLocos,
    required this.leaderboard,
    required this.trips,
    this.user,
  });

  factory HomepageStats.fromJson(Map<String, dynamic> json) {
    final userData = json['user_data'];
    final mileageData = json['milage_data'];
    final totalMileage = mileageData is Map && mileageData['mileage'] != null
        ? (mileageData['mileage'] as num).toDouble()
        : 0.0;
    return HomepageStats(
      totalMileage: totalMileage,
      yearlyMileage: (json['yearly_mileage'] as List? ?? [])
          .map((e) => YearlyMileage.fromJson(e))
          .toList(),
      topLocos: (json['top_locos'] as List? ?? [])
          .map((e) => LocoSummary.fromJson(e))
          .toList(),
      leaderboard: (json['leaderboard_data'] as List? ?? [])
          .map((e) => LeaderboardEntry.fromJson(e))
          .toList(),
      trips: (json['trip_data'] as List? ?? [])
          .map((e) => TripSummary.fromJson(e))
          .toList(),
      user: userData == null
          ? null
          : UserData(
              userData['username'] ?? '',
              userData['full_name'] ?? '',
              userData['user_id'] ?? '',
              userData['email'] ?? '',
            ),
    );
  }
}

class YearlyMileage {
  final int? year;
  final double mileage;

  YearlyMileage({this.year, required this.mileage});

  factory YearlyMileage.fromJson(Map<String, dynamic> json) => YearlyMileage(
    year: json['year'],
    mileage: (json['mileage'] as num).toDouble(),
  );
}

class Loco {
  final int id;
  final String type, number, locoClass;
  final String? name, operator, notes, evn;

  Loco({
    required this.id,
    required this.type,
    required this.number,
    required this.name,
    required this.locoClass,
    required this.operator,
    this.notes,
    this.evn,
  });

  factory Loco.fromJson(Map<String, dynamic> json) => Loco(
    id: json['loco_id'],
    type: json['type'],
    number: json['number'],
    name: json['name'] ?? "",
    locoClass: json['class'],
    operator: json['operator'],
    notes: json['notes'],
    evn: json['evn'],
  );
}

class LocoSummary extends Loco {
  final double? mileage;
  final int? journeys;
  final int? trips;
  final String? status;
  final String? domain;
  final String? owner;
  final String? livery;
  final String? location;
  final Map<String, dynamic> extra;

  LocoSummary({
    required int locoId,
    required String locoType,
    required String locoNumber,
    required String locoName,
    required super.locoClass,
    required String locoOperator,
    String? locoNotes,
    String? locoEvn,
    this.mileage,
    this.journeys,
    this.trips,
    this.status,
    this.domain,
    this.owner,
    this.livery,
    this.location,
    Map<String, dynamic>? extra,
  }) : extra = extra ?? const {},
       super(
         id: locoId,
         type: locoType,
         number: locoNumber,
         name: locoName,
         operator: locoOperator,
         notes: locoNotes,
         evn: locoEvn,
       );

  factory LocoSummary.fromJson(Map<String, dynamic> json) => LocoSummary(
    locoId: json['loco_id'] ?? json['id'] ?? 0,
    locoType: json['type'] ?? json['loco_type'] ?? '',
    locoNumber: json['number'] ?? json['loco_number'] ?? '',
    locoName: json['name'] ?? json['loco_name'] ?? "",
    locoClass: json['class'] ?? json['loco_class'] ?? '',
    locoOperator: json['operator'] ?? json['loco_operator'] ?? '',
    locoNotes: json['notes'],
    locoEvn: json['evn'] ?? json['loco_evn'],
    mileage:
        ((json['loco_mileage'] ?? json['mileage']) as num?)?.toDouble() ?? 0,
    journeys: (json['loco_journeys'] ?? json['journeys'] ?? 0) is num
        ? (json['loco_journeys'] ?? json['journeys'] ?? 0).toInt()
        : 0,
    trips: (json['loco_trips'] ?? json['trips']) is num
        ? (json['loco_trips'] ?? json['trips']).toInt()
        : null,
    status: json['status'] ?? json['loco_status'],
    domain: json['domain'],
    owner: json['owner'] ?? json['loco_owner'],
    livery: json['livery'],
    location: json['location'],
    extra: Map<String, dynamic>.from(json),
  );
}

class LocoAttrVersion {
  final String attrCode;
  final int? versionId;
  final int locoId;
  final int? attrTypeId;
  final String? valueStr;
  final int? valueInt;
  final DateTime? valueDate;
  final bool? valueBool;
  final String? valueEnum;
  final DateTime? validFrom;
  final DateTime? validTo;
  final DateTime? txnFrom;
  final DateTime? txnTo;
  final String? suggestedBy;
  final String? approvedBy;
  final DateTime? approvedAt;
  final int? sourceEventId;
  final String? precisionLevel;
  final String? maskedValidFrom;
  final dynamic valueNorm;

  const LocoAttrVersion({
    required this.attrCode,
    required this.locoId,
    this.versionId,
    this.attrTypeId,
    this.valueStr,
    this.valueInt,
    this.valueDate,
    this.valueBool,
    this.valueEnum,
    this.validFrom,
    this.validTo,
    this.txnFrom,
    this.txnTo,
    this.suggestedBy,
    this.approvedBy,
    this.approvedAt,
    this.sourceEventId,
    this.precisionLevel,
    this.maskedValidFrom,
    this.valueNorm,
  });

  factory LocoAttrVersion.fromJson(Map<String, dynamic> json) {
    return LocoAttrVersion(
      attrCode: json['attr_code']?.toString() ?? '',
      locoId: (json['loco_id'] as num?)?.toInt() ?? 0,
      versionId: (json['loco_attr_v_id'] as num?)?.toInt(),
      attrTypeId: (json['attr_type_id'] as num?)?.toInt(),
      valueStr: json['value_str']?.toString(),
      valueInt: (json['value_int'] as num?)?.toInt(),
      valueDate: _parseDate(json['value_date']),
      valueBool: _parseBool(json['value_bool']),
      valueEnum: json['value_enum']?.toString(),
      validFrom: _parseDate(json['valid_from']),
      validTo: _parseDate(json['valid_to']),
      txnFrom: _parseDate(json['txn_from']),
      txnTo: _parseDate(json['txn_to']),
      suggestedBy: json['suggested_by']?.toString(),
      approvedBy: json['approved_by']?.toString(),
      approvedAt: _parseDate(json['approved_at']),
      sourceEventId: (json['source_event_id'] as num?)?.toInt(),
      precisionLevel: json['precision_level']?.toString(),
      maskedValidFrom: json['masked_valid_from']?.toString(),
      valueNorm: json['value_norm'],
    );
  }

  static DateTime? _parseDate(dynamic value) {
    if (value == null) return null;
    if (value is DateTime) return value;
    return DateTime.tryParse(value.toString());
  }

  static bool? _parseBool(dynamic value) {
    if (value == null) return null;
    if (value is bool) return value;
    if (value is num) return value != 0;
    final str = value.toString().toLowerCase();
    if (['true', '1', 'yes'].contains(str)) return true;
    if (['false', '0', 'no'].contains(str)) return false;
    return null;
  }

  static List<LocoAttrVersion> fromGroupedJson(dynamic json) {
    final List<LocoAttrVersion> items = [];
    if (json is Map) {
      json.forEach((key, value) {
        if (value is List) {
          for (final entry in value) {
            if (entry is Map<String, dynamic>) {
              final merged = Map<String, dynamic>.from(entry);
              merged.putIfAbsent('attr_code', () => key);
              items.add(LocoAttrVersion.fromJson(merged));
            }
          }
        }
      });
    }
    items.sort(
      (a, b) {
        final aDate = a.validFrom ?? a.txnFrom ?? DateTime.fromMillisecondsSinceEpoch(0);
        final bDate = b.validFrom ?? b.txnFrom ?? DateTime.fromMillisecondsSinceEpoch(0);
        final dateCompare = aDate.compareTo(bDate);
        if (dateCompare != 0) return dateCompare;
        return a.attrCode.compareTo(b.attrCode);
      },
    );
    return items;
  }

  String get valueLabel {
    if (valueStr != null && valueStr!.isNotEmpty) return valueStr!;
    if (valueEnum != null && valueEnum!.isNotEmpty) return valueEnum!;
    if (valueInt != null) return valueInt!.toString();
    if (valueBool != null) return valueBool! ? 'Yes' : 'No';
    if (valueDate != null) return DateFormat('yyyy-MM-dd').format(valueDate!);
    if (valueNorm != null && valueNorm.toString().isNotEmpty) {
      return valueNorm.toString();
    }
    return '—';
  }

  String get validityRange {
    final start = maskedValidFrom ?? _formatDate(validFrom) ?? 'Unknown';
    final end = _formatDate(validTo, fallback: 'Present') ?? 'Present';
    return '$start → $end';
  }

  String? _formatDate(DateTime? value, {String? fallback}) {
    if (value == null) return fallback;
    return DateFormat('yyyy-MM-dd').format(value);
  }
}

class LeaderboardEntry {
  final String userId, username, userFullName;
  final double mileage;

  LeaderboardEntry({
    required this.userId,
    required this.username,
    required this.userFullName,
    required this.mileage,
  });

  factory LeaderboardEntry.fromJson(Map<String, dynamic> json) =>
      LeaderboardEntry(
        userId: json['user_id'],
        username: json['username'],
        userFullName: json['user_full_name'],
        mileage: (json['mileage'] as num).toDouble(),
      );
}

class TripSummary {
  final int tripId;
  final String tripName;
  final double tripMileage;

  TripSummary({
    required this.tripId,
    required this.tripName,
    required this.tripMileage,
  });

  factory TripSummary.fromJson(Map<String, dynamic> json) => TripSummary(
    tripId: json['trip_id'],
    tripName: json['trip_name'],
    tripMileage: (json['trip_mileage'] as num).toDouble(),
  );
}

class Leg {
  final int id, tripId, timezone, driving;
  final String start, end, route, network, notes, headcode, user;
  final DateTime beginTime;
  final double mileage;
  final List<Loco> locos;

  Leg({
    required this.id,
    required this.tripId,
    required this.start,
    required this.end,
    required this.beginTime,
    required this.timezone,
    required this.network,
    required this.route,
    required this.mileage,
    required this.notes,
    required this.headcode,
    required this.driving,
    required this.user,
    required this.locos,
  });

  factory Leg.fromJson(Map<String, dynamic> json) => Leg(
    id: json['leg_id'],
    tripId: json['leg_trip'] ?? 0,
    start: json['leg_start'],
    end: json['leg_end'],
    beginTime: DateTime.parse(json['leg_begin_time']),
    timezone: (json['leg_timezone'] as num).toInt(),
    network: json['leg_network'] ?? "",
    route: json['leg_route'],
    mileage: (json['leg_mileage'] as num).toDouble(),
    notes: json['leg_notes'] ?? "",
    headcode: json['leg_headcode'] ?? "",
    driving: json['leg_driving'],
    user: json['leg_user'],
    locos: (json['locos'] as List)
        .map((e) => Loco.fromJson(e as Map<String, dynamic>))
        .toList(),
  );
}

class RouteError {
  final String error;
  final String msg;

  RouteError({required this.error, required this.msg});

  factory RouteError.fromJson(Map<String, dynamic> json) {
    return RouteError(error: json["error"], msg: json["msg"]);
  }
}

class RouteResult {
  final List<String> inputRoute;
  final List<String> calculatedRoute;
  final List<double> costs;
  final double distance;

  RouteResult({
    required this.inputRoute,
    required this.calculatedRoute,
    required this.costs,
    required this.distance,
  });

  factory RouteResult.fromJson(Map<String, dynamic> json) {
    return RouteResult(
      inputRoute: List<String>.from(json['input_route']),
      calculatedRoute: List<String>.from(json['calculated_route']),
      costs: (json['costs'] as List).map((e) => (e as num).toDouble()).toList(),
      distance: (json['distance'] as num).toDouble(),
    );
  }
}

class Station {
  final int id;
  final String name;
  final String network;
  final String country;

  Station({
    required this.id,
    required this.name,
    required this.network,
    required this.country,
  });

  factory Station.fromJson(Map<String, dynamic> json) => Station(
    id: json['id'],
    name: json['name'],
    network: json['network'],
    country: json['country'],
  );
}

class TripLeg {
  final int? id;
  final String start;
  final String end;
  final DateTime? beginTime;
  final String? network;
  final String? route;
  final double? mileage;
  final String? notes;
  final List<Loco> locos;

  TripLeg({
    required this.id,
    required this.start,
    required this.end,
    required this.beginTime,
    required this.network,
    required this.route,
    required this.mileage,
    required this.notes,
    required this.locos,
  });

  factory TripLeg.fromJson(Map<String, dynamic> json) => TripLeg(
    id: json['leg_id'],
    start: json['leg_start'] ?? '',
    end: json['leg_end'] ?? '',
    beginTime:
        json['leg_begin_time'] != null && json['leg_begin_time'] is String
        ? DateTime.tryParse(json['leg_begin_time'])
        : (json['leg_begin_time'] is DateTime ? json['leg_begin_time'] : null),
    network: json['leg_network'],
    route: json['leg_route'],
    mileage: (json['leg_mileage'] as num?)?.toDouble(),
    notes: json['leg_notes'],
    locos:
        (json['locos'] as List?)
            ?.map((e) => Loco.fromJson(e as Map<String, dynamic>))
            .toList() ??
        [],
  );
}

class TripDetail {
  final int id;
  final String name;
  final double mileage;
  final int legCount;
  final List<TripLeg> legs;

  TripDetail({
    required this.id,
    required this.name,
    required this.mileage,
    required this.legCount,
    required this.legs,
  });

  factory TripDetail.fromJson(Map<String, dynamic> json) => TripDetail(
    id: json['trip_id'] ?? json['id'] ?? 0,
    name: json['trip_name'] ?? '',
    mileage: (json['trip_mileage'] as num?)?.toDouble() ?? 0,
    legCount: json['leg_count'] ?? ((json['trip_legs'] as List?)?.length ?? 0),
    legs:
        (json['trip_legs'] as List?)
            ?.map((e) => TripLeg.fromJson(e as Map<String, dynamic>))
            .toList() ??
        [],
  );
}

class TripLocoStat {
  final String locoClass;
  final String number;
  final String? name;
  final bool won;

  TripLocoStat({
    required this.locoClass,
    required this.number,
    required this.won,
    this.name,
  });

  factory TripLocoStat.fromJson(Map<String, dynamic> json) {
    final locoJson = json['loco'] is Map<String, dynamic>
        ? Map<String, dynamic>.from(json['loco'] as Map)
        : null;
    final locoClass = json['loco_class'] ??
        json['class'] ??
        locoJson?['class'] ??
        locoJson?['loco_class'] ??
        '';
    final locoNumber = json['loco_number'] ??
        json['number'] ??
        locoJson?['number'] ??
        locoJson?['loco_number'] ??
        '';
    final locoName =
        json['loco_name'] ?? json['name'] ?? locoJson?['name'] ?? locoJson?['loco_name'];
    final wonValue = json['won'] ?? json['result'] ?? json['winner'];
    final won = _parseWonFlag(wonValue);

    return TripLocoStat(
      locoClass: locoClass,
      number: locoNumber,
      name: locoName,
      won: won,
    );
  }

  static bool _parseWonFlag(dynamic value) {
    if (value == null) return false;
    if (value is bool) return value;
    if (value is num) return value != 0;
    final normalized = value.toString().toLowerCase();
    return ['1', 'true', 'win', 'won', 'yes', 'w'].contains(normalized);
  }
}

class EventField {
  final String name;
  final String display;
  final String? type;
  final List<String>? enumValues;

  const EventField({
    required this.name,
    required this.display,
    this.type,
    this.enumValues,
  });

  factory EventField.fromJson(Map<String, dynamic> json) {
    final enumList = json['enum'];
    List<String>? enumValues;
    if (enumList is List) {
      enumValues = enumList.map((e) => e.toString()).toList();
    }
    final baseName = json['name']?.toString() ?? json['field']?.toString() ?? '';
    final display = json['field']?.toString() ?? baseName;
    return EventField(
      name: baseName,
      display: display,
      type: json['type']?.toString(),
      enumValues: enumValues,
    );
  }
}