// Domain models mirroring the API Server JSON (which mirrors Car Service.xlsx).

int _asInt(dynamic v) => v is int ? v : (v is num ? v.toInt() : 0);
String _asStr(dynamic v) => v == null ? "" : v.toString();
bool _asBool(dynamic v) => v == true;
double _asDouble(dynamic v) => v is num ? v.toDouble() : 0.0;

/// Nullable variants for the derived fields the server omits when it could not
/// compute them. A missing consumption figure is not zero — it means "unknown",
/// and must stay distinguishable so the UI can render "—" instead of a
/// misleading 0.0.
int? _asIntOrNull(dynamic v) => v is num ? v.toInt() : null;
double? _asDoubleOrNull(dynamic v) => v is num ? v.toDouble() : null;
DateTime? _asDate(dynamic v) =>
    v == null ? null : DateTime.tryParse(v.toString())?.toLocal();

/// The single optional file a record carries — a receipt, a scan, a photo of a
/// part's box. Mirrors the API's embedded Attachment: the bytes are never in the
/// JSON, only whether there are any and what they were stored as. Fetch them
/// from GET /{records}/{id}/file, which re-checks access per request.
mixin HasAttachment {
  String get fileName;
  bool get hasFile;
}

/// The server-computed lifecycle state of a dated document or certificate.
/// [days] is null when there is no expiry date at all.
class ExpiryAssessment {
  final String state; // no_expiry | valid | expiring_soon | expired
  final int? days;

  const ExpiryAssessment({this.state = "no_expiry", this.days});

  factory ExpiryAssessment.fromJson(Map<String, dynamic>? j) {
    if (j == null) return const ExpiryAssessment();
    return ExpiryAssessment(
      state: _asStr(j["state"]).isEmpty ? "no_expiry" : _asStr(j["state"]),
      days: _asIntOrNull(j["daysUntilExpiry"]),
    );
  }
}

class Car {
  final String id;
  final String name;
  final String make;
  final String model;
  final int year;
  final String registration;
  final String registrationCountry;
  final String vin;
  final String oilSpec;
  final String transmissionOilSpec;
  final String differentialOilSpec;
  final String brakeFluidSpec;
  final String coolantSpec;
  final String fuelType; // petrol | petrol_lpg | diesel | diesel_lpg | hybrid | electric | hydrogen
  final String buildDate; // ISO YYYY-MM-DD (date-only)
  final String firstRegistrationDate; // ISO YYYY-MM-DD (date-only)
  final int serviceIntervalDays;
  final int serviceIntervalKm;

  /// The roadworthiness inspection cycle. Only prefills the next date — the
  /// interval is set by law rather than by the car, so any check can override it
  /// with the date its certificate actually carries.
  final int technicalCheckIntervalDays;
  final int currentKm;

  /// The requesting user's permission on this car: "owner", "write", or "read".
  /// The API sets it on every car read. Defaults to "owner" so older responses
  /// (or any code that constructs a Car without it) stay fully editable.
  final String access;

  Car({
    required this.id,
    required this.name,
    required this.make,
    required this.model,
    required this.year,
    required this.registration,
    this.registrationCountry = "",
    required this.vin,
    required this.oilSpec,
    required this.transmissionOilSpec,
    required this.differentialOilSpec,
    required this.brakeFluidSpec,
    required this.coolantSpec,
    this.fuelType = "",
    this.buildDate = "",
    this.firstRegistrationDate = "",
    required this.serviceIntervalDays,
    required this.serviceIntervalKm,
    this.technicalCheckIntervalDays = 0,
    required this.currentKm,
    this.access = "owner",
  });

  factory Car.fromJson(Map<String, dynamic> j) => Car(
        id: _asStr(j["id"]),
        name: _asStr(j["name"]),
        make: _asStr(j["make"]),
        model: _asStr(j["model"]),
        year: _asInt(j["year"]),
        registration: _asStr(j["registration"]),
        registrationCountry: _asStr(j["registrationCountry"]),
        vin: _asStr(j["vin"]),
        oilSpec: _asStr(j["oilSpec"]),
        transmissionOilSpec: _asStr(j["transmissionOilSpec"]),
        differentialOilSpec: _asStr(j["differentialOilSpec"]),
        brakeFluidSpec: _asStr(j["brakeFluidSpec"]),
        coolantSpec: _asStr(j["coolantSpec"]),
        fuelType: _asStr(j["fuelType"]),
        buildDate: _asStr(j["buildDate"]),
        firstRegistrationDate: _asStr(j["firstRegistrationDate"]),
        serviceIntervalDays: _asInt(j["serviceIntervalDays"]),
        serviceIntervalKm: _asInt(j["serviceIntervalKm"]),
        technicalCheckIntervalDays: _asInt(j["technicalCheckIntervalDays"]),
        currentKm: _asInt(j["currentKm"]),
        access: j["access"] == null ? "owner" : _asStr(j["access"]),
      );

  bool get isOwner => access == "owner";
  bool get canWrite => access == "owner" || access == "write";
  bool get isReadOnly => access == "read";

  String get subtitle =>
      [make, model, year > 0 ? "$year" : ""].where((s) => s.isNotEmpty).join(" ");
}

class ServiceRecord with HasAttachment {
  final String id;
  final String car;
  final DateTime? date;
  final int km;
  final bool changedOil;
  final bool changedEngineAirFilter;
  final bool changedCabinAirFilter;
  final String notes;
  final DateTime? nextServiceDate;
  final int? nextServiceKm;
  @override
  final String fileName;
  @override
  final bool hasFile;

  ServiceRecord({
    required this.id,
    required this.car,
    required this.date,
    required this.km,
    required this.changedOil,
    required this.changedEngineAirFilter,
    required this.changedCabinAirFilter,
    required this.notes,
    required this.nextServiceDate,
    required this.nextServiceKm,
    this.fileName = "",
    this.hasFile = false,
  });

  factory ServiceRecord.fromJson(Map<String, dynamic> j) => ServiceRecord(
        id: _asStr(j["id"]),
        car: _asStr(j["car"]),
        date: _asDate(j["date"]),
        km: _asInt(j["km"]),
        changedOil: _asBool(j["changedOil"]),
        changedEngineAirFilter: _asBool(j["changedEngineAirFilter"]),
        changedCabinAirFilter: _asBool(j["changedCabinAirFilter"]),
        notes: _asStr(j["notes"]),
        nextServiceDate: _asDate(j["nextServiceDate"]),
        nextServiceKm: _asIntOrNull(j["nextServiceKm"]),
        fileName: _asStr(j["fileName"]),
        hasFile: _asBool(j["hasFile"]),
      );
}

/// One mandatory roadworthiness inspection — przegląd techniczny, MOT, TÜV,
/// contrôle technique, depending on where the car is registered. Shaped like a
/// [ServiceRecord] but recurring on time alone: an inspection falls due on a
/// date whatever the odometer says.
class TechnicalCheck with HasAttachment {
  final String id;
  final String car;
  final DateTime? date;
  final String result; // passed | failed
  final double cost;
  final String station;
  final String notes;

  /// The expiry printed on the certificate. When set it wins over the car's
  /// interval, because it is the date that actually governs.
  final DateTime? validUntil;

  final DateTime? nextCheckDate;
  final ExpiryAssessment expiry;
  @override
  final String fileName;
  @override
  final bool hasFile;

  TechnicalCheck({
    required this.id,
    required this.car,
    required this.date,
    required this.result,
    required this.cost,
    this.station = "",
    this.notes = "",
    this.validUntil,
    this.nextCheckDate,
    this.expiry = const ExpiryAssessment(),
    this.fileName = "",
    this.hasFile = false,
  });

  factory TechnicalCheck.fromJson(Map<String, dynamic> j) => TechnicalCheck(
        id: _asStr(j["id"]),
        car: _asStr(j["car"]),
        date: _asDate(j["date"]),
        result: _asStr(j["result"]).isEmpty ? "passed" : _asStr(j["result"]),
        cost: _asDouble(j["cost"]),
        station: _asStr(j["station"]),
        notes: _asStr(j["notes"]),
        validUntil: _asDate(j["validUntil"]),
        nextCheckDate: _asDate(j["nextCheckDate"]),
        expiry: ExpiryAssessment.fromJson(
            j["expiry"] == null ? null : Map<String, dynamic>.from(j["expiry"])),
        fileName: _asStr(j["fileName"]),
        hasFile: _asBool(j["hasFile"]),
      );

  bool get passed => result == "passed";
}

class Part with HasAttachment {
  final String id;
  final String car;
  final String name;
  final String partNumber;
  final String category;
  final String notes;
  @override
  final String fileName;
  @override
  final bool hasFile;

  Part({
    required this.id,
    required this.car,
    required this.name,
    required this.partNumber,
    this.category = "",
    this.notes = "",
    this.fileName = "",
    this.hasFile = false,
  });

  factory Part.fromJson(Map<String, dynamic> j) => Part(
        id: _asStr(j["id"]),
        car: _asStr(j["car"]),
        name: _asStr(j["name"]),
        partNumber: _asStr(j["partNumber"]),
        category: _asStr(j["category"]),
        notes: _asStr(j["notes"]),
        fileName: _asStr(j["fileName"]),
        hasFile: _asBool(j["hasFile"]),
      );
}

/// One refuelling stop. The efficiency figures are derived by the server using
/// the full-tank method and are null wherever it could not compute them — a
/// window with a missed fill, or the first tank ever logged.
class FuelEntry with HasAttachment {
  final String id;
  final String car;
  final DateTime? date;
  final int km;
  final double liters;
  final double cost;
  final bool fullTank;
  final bool missedFill;
  final String station;
  final String notes;

  final double? pricePerLiter;
  final int? distanceKm;
  final double? litersUsed;
  final double? consumptionL100;
  final double? kmPerLiter;
  final double? costPerKm;
  @override
  final String fileName;
  @override
  final bool hasFile;

  FuelEntry({
    required this.id,
    required this.car,
    required this.date,
    required this.km,
    required this.liters,
    required this.cost,
    this.fullTank = true,
    this.missedFill = false,
    this.station = "",
    this.notes = "",
    this.pricePerLiter,
    this.distanceKm,
    this.litersUsed,
    this.consumptionL100,
    this.kmPerLiter,
    this.costPerKm,
    this.fileName = "",
    this.hasFile = false,
  });

  factory FuelEntry.fromJson(Map<String, dynamic> j) => FuelEntry(
        id: _asStr(j["id"]),
        car: _asStr(j["car"]),
        date: _asDate(j["date"]),
        km: _asInt(j["km"]),
        liters: _asDouble(j["liters"]),
        cost: _asDouble(j["cost"]),
        fullTank: _asBool(j["fullTank"]),
        missedFill: _asBool(j["missedFill"]),
        station: _asStr(j["station"]),
        notes: _asStr(j["notes"]),
        pricePerLiter: _asDoubleOrNull(j["pricePerLiter"]),
        distanceKm: _asIntOrNull(j["distanceKm"]),
        litersUsed: _asDoubleOrNull(j["litersUsed"]),
        consumptionL100: _asDoubleOrNull(j["consumptionL100"]),
        kmPerLiter: _asDoubleOrNull(j["kmPerLiter"]),
        costPerKm: _asDoubleOrNull(j["costPerKm"]),
        fileName: _asStr(j["fileName"]),
        hasFile: _asBool(j["hasFile"]),
      );
}

/// A summary of a car's whole refill history. [trackedDistanceKm] is the
/// distance covered by computable full-tank windows — less than the odometer
/// span whenever the history starts or ends on a partial fill. The averages
/// describe exactly this distance.
class FuelStats {
  final int entries;
  final double totalLiters;
  final double totalCost;
  final int trackedDistanceKm;
  final double? avgConsumptionL100;
  final double? bestConsumptionL100;
  final double? worstConsumptionL100;
  final double? avgKmPerLiter;
  final double? avgPricePerLiter;
  final double? costPerKm;
  final DateTime? firstDate;
  final DateTime? lastDate;

  const FuelStats({
    this.entries = 0,
    this.totalLiters = 0,
    this.totalCost = 0,
    this.trackedDistanceKm = 0,
    this.avgConsumptionL100,
    this.bestConsumptionL100,
    this.worstConsumptionL100,
    this.avgKmPerLiter,
    this.avgPricePerLiter,
    this.costPerKm,
    this.firstDate,
    this.lastDate,
  });

  factory FuelStats.fromJson(Map<String, dynamic> j) => FuelStats(
        entries: _asInt(j["entries"]),
        totalLiters: _asDouble(j["totalLiters"]),
        totalCost: _asDouble(j["totalCost"]),
        trackedDistanceKm: _asInt(j["trackedDistanceKm"]),
        avgConsumptionL100: _asDoubleOrNull(j["avgConsumptionL100"]),
        bestConsumptionL100: _asDoubleOrNull(j["bestConsumptionL100"]),
        worstConsumptionL100: _asDoubleOrNull(j["worstConsumptionL100"]),
        avgKmPerLiter: _asDoubleOrNull(j["avgKmPerLiter"]),
        avgPricePerLiter: _asDoubleOrNull(j["avgPricePerLiter"]),
        costPerKm: _asDoubleOrNull(j["costPerKm"]),
        firstDate: _asDate(j["firstDate"]),
        lastDate: _asDate(j["lastDate"]),
      );
}

/// One workshop visit or repair — work done outside the routine service
/// schedule (which lives in [ServiceRecord]). A broken alternator replaced at a
/// garage belongs here; the annual oil change does not.
class MaintenanceEntry with HasAttachment {
  final String id;
  final String car;
  final DateTime? date;
  final int km;
  final String type; // repair|inspection|bodywork|tyres|diagnostics|recall|warranty|other
  final String status; // scheduled|in_progress|completed
  final String workshop;
  final String location;
  final String description;
  final String partsUsed;
  final double laborCost;
  final double partsCost;
  final String invoiceNumber;
  final DateTime? warrantyUntil;
  final String notes;

  final double totalCost;
  final bool? warrantyActive;
  final int? warrantyDaysLeft;
  @override
  final String fileName;
  @override
  final bool hasFile;

  MaintenanceEntry({
    required this.id,
    required this.car,
    required this.date,
    required this.km,
    required this.type,
    required this.status,
    this.workshop = "",
    this.location = "",
    this.description = "",
    this.partsUsed = "",
    this.laborCost = 0,
    this.partsCost = 0,
    this.invoiceNumber = "",
    this.warrantyUntil,
    this.notes = "",
    this.totalCost = 0,
    this.warrantyActive,
    this.warrantyDaysLeft,
    this.fileName = "",
    this.hasFile = false,
  });

  factory MaintenanceEntry.fromJson(Map<String, dynamic> j) => MaintenanceEntry(
        id: _asStr(j["id"]),
        car: _asStr(j["car"]),
        date: _asDate(j["date"]),
        km: _asInt(j["km"]),
        type: _asStr(j["type"]).isEmpty ? "repair" : _asStr(j["type"]),
        status: _asStr(j["status"]).isEmpty ? "completed" : _asStr(j["status"]),
        workshop: _asStr(j["workshop"]),
        location: _asStr(j["location"]),
        description: _asStr(j["description"]),
        partsUsed: _asStr(j["partsUsed"]),
        laborCost: _asDouble(j["laborCost"]),
        partsCost: _asDouble(j["partsCost"]),
        invoiceNumber: _asStr(j["invoiceNumber"]),
        warrantyUntil: _asDate(j["warrantyUntil"]),
        notes: _asStr(j["notes"]),
        totalCost: _asDouble(j["totalCost"]),
        warrantyActive: j["warrantyActive"] == null ? null : _asBool(j["warrantyActive"]),
        warrantyDaysLeft: _asIntOrNull(j["warrantyDaysLeft"]),
        fileName: _asStr(j["fileName"]),
        hasFile: _asBool(j["hasFile"]),
      );
}

/// A piece of paperwork tied to a car — insurance, emissions certificate,
/// registration papers. The renewal date is the point of the record: an expired
/// policy is a car that cannot legally be driven, so [expiry] is computed live
/// by the server on every read.
class CarDocument with HasAttachment {
  final String id;
  final String car;
  final String type; // insurance|pollution|registration|inspection|roadTax|warranty|other
  final String title;
  final String provider;
  final String reference;
  final DateTime? issueDate;
  final DateTime? expiryDate; // blank = never expires
  final double cost;
  final String notes;
  final ExpiryAssessment expiry;
  @override
  final String fileName;
  @override
  final bool hasFile;

  CarDocument({
    required this.id,
    required this.car,
    required this.type,
    required this.title,
    this.provider = "",
    this.reference = "",
    this.issueDate,
    this.expiryDate,
    this.cost = 0,
    this.notes = "",
    this.expiry = const ExpiryAssessment(),
    this.fileName = "",
    this.hasFile = false,
  });

  factory CarDocument.fromJson(Map<String, dynamic> j) => CarDocument(
        id: _asStr(j["id"]),
        car: _asStr(j["car"]),
        type: _asStr(j["type"]).isEmpty ? "other" : _asStr(j["type"]),
        title: _asStr(j["title"]),
        provider: _asStr(j["provider"]),
        reference: _asStr(j["reference"]),
        issueDate: _asDate(j["issueDate"]),
        expiryDate: _asDate(j["expiryDate"]),
        cost: _asDouble(j["cost"]),
        notes: _asStr(j["notes"]),
        expiry: ExpiryAssessment.fromJson(
            j["expiry"] == null ? null : Map<String, dynamic>.from(j["expiry"])),
        fileName: _asStr(j["fileName"]),
        hasFile: _asBool(j["hasFile"]),
      );
}

/// Something the user wants to be told about: a booked workshop slot, an
/// insurance renewal, a tyre swap. Fires on a date, an odometer reading, or
/// both — whichever comes first. [auto] marks a reminder the server derived from
/// a document or service record, which is read-only.
class Reminder {
  final String id;
  final String car;
  final String title;
  final String type; // maintenance|document|service|inspection|other
  final DateTime? dueDate;
  final int dueKm;
  final int repeatDays;
  final int repeatKm;
  final bool done;
  final DateTime? doneAt;
  final String notes;

  final String status; // done | overdue | due_soon | upcoming | no_trigger
  final int? daysLeft;
  final int? kmLeft;
  final bool auto;
  final String sourceRef;

  Reminder({
    required this.id,
    required this.car,
    required this.title,
    required this.type,
    this.dueDate,
    this.dueKm = 0,
    this.repeatDays = 0,
    this.repeatKm = 0,
    this.done = false,
    this.doneAt,
    this.notes = "",
    this.status = "no_trigger",
    this.daysLeft,
    this.kmLeft,
    this.auto = false,
    this.sourceRef = "",
  });

  factory Reminder.fromJson(Map<String, dynamic> j) => Reminder(
        id: _asStr(j["id"]),
        car: _asStr(j["car"]),
        title: _asStr(j["title"]),
        type: _asStr(j["type"]).isEmpty ? "other" : _asStr(j["type"]),
        dueDate: _asDate(j["dueDate"]),
        dueKm: _asInt(j["dueKm"]),
        repeatDays: _asInt(j["repeatDays"]),
        repeatKm: _asInt(j["repeatKm"]),
        done: _asBool(j["done"]),
        doneAt: _asDate(j["doneAt"]),
        notes: _asStr(j["notes"]),
        status: _asStr(j["status"]).isEmpty ? "no_trigger" : _asStr(j["status"]),
        daysLeft: _asIntOrNull(j["daysLeft"]),
        kmLeft: _asIntOrNull(j["kmLeft"]),
        auto: _asBool(j["auto"]),
        sourceRef: _asStr(j["sourceRef"]),
      );

  /// Recurring reminders roll their trigger forward on completion instead of
  /// closing out.
  bool get repeats => repeatDays > 0 || repeatKm > 0;
}

/// A sharing grant: another user's access to one of your cars.
class CarShare {
  final String userId;
  final String email;
  final String name;
  final String permission; // "read" | "write"

  CarShare({
    required this.userId,
    required this.email,
    required this.name,
    required this.permission,
  });

  factory CarShare.fromJson(Map<String, dynamic> j) {
    final user = Map<String, dynamic>.from(j["user"] ?? {});
    return CarShare(
      userId: _asStr(user["id"]),
      email: _asStr(user["email"]),
      name: _asStr(user["name"]),
      permission: _asStr(j["permission"]),
    );
  }

  String get label => name.isNotEmpty ? name : email;
}

/// Roles allowed to manage users. A superadmin is an admin that also spans
/// every organization; the API Server enforces that difference.
const _managerRoles = {"admin", "superadmin"};

class AuthUser {
  final String id;
  final String email;
  final String name;
  final String role; // "user" | "admin" | "superadmin"
  AuthUser({required this.id, required this.email, required this.name, this.role = "user"});

  factory AuthUser.fromJson(Map<String, dynamic> j) => AuthUser(
        id: _asStr(j["id"]),
        email: _asStr(j["email"]),
        name: _asStr(j["name"]),
        // An empty role is treated as "user", matching the server.
        role: _asStr(j["role"]).isEmpty ? "user" : _asStr(j["role"]),
      );

  bool get isAdmin => _managerRoles.contains(role);
  bool get isSuperadmin => role == "superadmin";

  Map<String, dynamic> toJson() => {"id": id, "email": email, "name": name, "role": role};
}

/// A user record as returned by the admin user-management endpoints.
class AdminUser {
  final String id;
  final String email;
  final String name;
  final String role;
  final String created;
  final String organizationName; // "" when the user belongs to no organization

  AdminUser({
    required this.id,
    required this.email,
    required this.name,
    required this.role,
    required this.created,
    this.organizationName = "",
  });

  factory AdminUser.fromJson(Map<String, dynamic> j) => AdminUser(
        id: _asStr(j["id"]),
        email: _asStr(j["email"]),
        name: _asStr(j["name"]),
        role: _asStr(j["role"]).isEmpty ? "user" : _asStr(j["role"]),
        created: _asStr(j["created"]),
        organizationName: _asStr(j["organizationName"]),
      );

  bool get isSuperadmin => role == "superadmin";
}

/// The full authenticated profile (Settings panel), mirroring /api/me.
class UserProfile {
  final String id;
  final String email;
  final bool verified;
  final String name;
  final String bio;
  final bool hasAvatar;
  final String theme; // light | dark | system
  final String locale; // BCP-47 language-REGION, e.g. "en-US"
  final String dateFormat; // YMD | DMY_NUM | DMY | MDY
  final String currency; // ISO 4217 code, e.g. "EUR"
  final String fontSize; // small | medium | large
  final String role; // user | admin
  final DateTime? deletionRequestedAt;

  UserProfile({
    required this.id,
    required this.email,
    required this.verified,
    required this.name,
    required this.bio,
    required this.hasAvatar,
    required this.theme,
    required this.locale,
    required this.dateFormat,
    this.currency = "USD",
    required this.fontSize,
    required this.role,
    required this.deletionRequestedAt,
  });

  factory UserProfile.fromJson(Map<String, dynamic> j) => UserProfile(
        id: _asStr(j["id"]),
        email: _asStr(j["email"]),
        verified: _asBool(j["verified"]),
        name: _asStr(j["name"]),
        bio: _asStr(j["bio"]),
        hasAvatar: _asBool(j["hasAvatar"]),
        theme: j["theme"] == null ? "system" : _asStr(j["theme"]),
        locale: j["locale"] == null ? "en-US" : _asStr(j["locale"]),
        dateFormat: j["dateFormat"] == null ? "YMD" : _asStr(j["dateFormat"]),
        currency: j["currency"] == null ? "USD" : _asStr(j["currency"]),
        fontSize: j["fontSize"] == null ? "medium" : _asStr(j["fontSize"]),
        role: j["role"] == null ? "user" : _asStr(j["role"]),
        deletionRequestedAt: j["deletionRequestedAt"] == null
            ? null
            : DateTime.tryParse(_asStr(j["deletionRequestedAt"]))?.toLocal(),
      );

  bool get isAdmin => _managerRoles.contains(role);
  bool get isSuperadmin => role == "superadmin";
  bool get deletionPending => deletionRequestedAt != null;
}

// The Session model is gone: auth now uses PocketBase's own stateless tokens,
// so there is no per-device session list to show or revoke.