import { apiClient } from '@/lib/api-client';

// ── Search (POST /search) ──────────────────────────────────────────────────

export interface SearchTripsRequest {
  originStationId: string;
  destinationStationId: string;
  date: string;
  adultCount: number;
  childCount?: number;
  journeyType: 'ONE_WAY' | 'ROUND_TRIP';
  /** Required when journeyType is ROUND_TRIP. */
  returnDate?: string;
  /** Drives which fare tier (Local vs International) gets quoted — see fareTier in the page component. */
  nationality?: string;
  /** Always 'GROUP_BOOKING' for this app — search returns ONLY schedules marked
   * isGroupBookingOnly (an exclusive partition, not additive): normal passenger-facing
   * schedules never show up here, and group-only schedules never show up in the portal. */
  channel?: 'PORTAL' | 'GROUP_BOOKING';
}

export interface ScheduleClassOption {
  name: string;
  baseFareMinor: number;
  displayCurrency: string;
  displayAmountMinor: number;
  available: number;
}

export interface ScheduleCoachType {
  coachTypeId: string;
  coachTypeName: string;
  coachTypeCode: string;
  coachId: string;
  classes: ScheduleClassOption[];
}

export interface ScheduleResult {
  type: 'DIRECT';
  scheduleId: string;
  trainNumber: string;
  trainName: string;
  origin: { id: string; code: string; name: string; city: string; sequence: number };
  destination: { id: string; code: string; name: string; city: string; sequence: number };
  departureAt: string;
  arrivalAt: string;
  durationMinutes: number;
  status: string;
  hasAvailability: boolean;
  displayCurrency: string;
  coachTypes: ScheduleCoachType[];
}

export type SearchEmptyReasonCode =
  | 'NO_ROUTE'
  | 'NO_SCHEDULE_ON_DATE'
  | 'CANCELLED'
  | 'PACKAGE_ONLY'
  | 'GROUP_BOOKING_ONLY'
  | 'CHECKIN_CLOSED'
  | 'FULLY_BOOKED';

/** Structured, not a string — always render via a code→message lookup, never directly. */
export interface SearchEmptyReason {
  code: SearchEmptyReasonCode;
  originStationName: string;
  destinationStationName: string;
}

export interface SearchTripsResponse {
  journeyType: string;
  outbound: ScheduleResult[];
  requestedDate: string;
  outboundReason?: SearchEmptyReason;
  /** Nearby schedules for the same station pair on a different date, offered when `outbound` is empty. */
  alternativeOutbound?: ScheduleResult[];
  /** Return-leg schedules — present when the request's journeyType was ROUND_TRIP. */
  inbound?: ScheduleResult[];
  requestedReturnDate?: string;
  inboundReason?: SearchEmptyReason;
  alternativeInbound?: ScheduleResult[];
}

// ── Seat classes (GET /seat-classes) ───────────────────────────────────────

export interface SeatClassOption {
  id: string;
  name: string;
}

// ── Auto-assign + hold (POST /seats/auto-assign-hold) ─────────────────────

export interface AutoAssignHoldRequest {
  scheduleId: string;
  originStationId: string;
  destinationStationId: string;
  seatClassName: string;
  adultCount: number;
  childCount?: number;
  /** Round-trip leg tag — omit for a one-way booking. */
  journeyDirection?: 'OUTBOUND' | 'RETURN';
}

export interface HeldPassengerSeat {
  passengerId: string;
  seat: {
    id: string;
    label?: string;
    seatNumber?: string;
    coach?: string;
    row?: number;
    col?: string;
  };
}

export interface AutoAssignHoldResponse {
  holdId: string;
  expiresAt: string;
  ttlSeconds: number;
  schedule: { id: string; trainNumber: string; trainName: string; departureAt: string; arrivalAt: string } | null;
  passengers: HeldPassengerSeat[];
}

// ── Group booking creation (POST /bookings/group) ──────────────────────────

export interface GroupBookingPassengerInput {
  /** Omit for a free child (ONE_WAY only) — matches guest-booking.dto.ts's own optional seatId. */
  seatId?: string;
  passengerName: string;
  dateOfBirth: string;
  idDocumentType: 'NATIONAL_ID' | 'PASSPORT' | 'DRIVING_LICENSE' | 'OTHER';
  idDocumentNumber?: string;
  passportNumber?: string;
  passportCountry?: string;
  nationality?: string;
  phone?: string;
  email?: string;
  /** Return-leg seat ID — required when the booking is ROUND_TRIP. */
  returnSeatId?: string;
}

export interface CreateGroupBookingRequest {
  scheduleId: string;
  holdId: string;
  originStationId: string;
  destinationStationId: string;
  seatClassId: string;
  bookingType: 'ONE_WAY' | 'ROUND_TRIP';
  passengers: GroupBookingPassengerInput[];
  /** ROUND_TRIP only. */
  returnScheduleId?: string;
  returnHoldId?: string;
  returnOriginStationId?: string;
  returnDestinationStationId?: string;
  /** Falls back to seatClassId on the backend if omitted. */
  returnSeatClassId?: string;
}

export interface GroupBookingSeat {
  seatId: string;
  passengerName: string;
  passengerCategory: 'ADULT' | 'CHILD';
  /** 1 = outbound leg, 2 = return leg. Absent on a plain ONE_WAY booking. */
  leg?: number;
  seat: { seatNumber: string; bedPosition?: string | null; coach: { number: string } };
}

export interface CreateGroupBookingResponse {
  id: string;
  bookingRef: string;
  status: string;
  totalMinor: number;
  currency: string;
  adultCount: number;
  childCount: number;
  seats: GroupBookingSeat[];
  schedule: {
    departureAt: string;
    arrivalAt: string;
    train: { number: string; name: string };
    originStation: { name: string };
    destinationStation: { name: string };
  };
}

// ── Payment (GET /payments/methods, POST /payments/initiate) ───────────────

export type PaymentMethodType =
  | 'TELEBIRR' | 'CBE_BIRR' | 'EBIRR' | 'WAAFI' | 'DMONEY' | 'CAC_BANK' | 'CARD' | 'WALLET' | 'CBE_BILL';

export interface SupportedPaymentMethod {
  id: string;
  type: PaymentMethodType;
  displayName: string;
  region: string;
  currency: string;
  enabled: boolean;
}

export interface InitiatePaymentRequest {
  bookingId: string;
  method: PaymentMethodType;
  paymentMethodId?: string;
  platform?: 'web' | 'mobile' | 'inapp';
}

export interface PaymentClientAction {
  type: 'REDIRECT' | 'LAUNCH_APP' | 'INVOKE_BRIDGE' | 'COLLECT_OTP' | 'AWAIT_PUSH' | 'SHOW_BILL_REFERENCE';
  url?: string;
  /** Set when type=SHOW_BILL_REFERENCE (CBE bill payment) — the number the payer enters at any CBE channel. */
  billReference?: string;
  instructions?: string;
  expiresAt?: string;
  message?: string;
  payerAccountMasked?: string;
}

export interface InitiatePaymentResponse {
  intentId: string;
  status: string;
  clientAction?: PaymentClientAction;
  merchantOrderId?: string;
  failureCode?: string;
  failureMessage?: string;
  sessionExpiresAt?: string;
  paymentDeadline?: string;
}

export const groupBookingApi = {
  searchTrips: (dto: SearchTripsRequest) =>
    apiClient.post<SearchTripsResponse>('/search', dto),

  getSeatClasses: () => apiClient.get<SeatClassOption[]>('/seat-classes'),

  autoAssignHold: (dto: AutoAssignHoldRequest) =>
    apiClient.post<AutoAssignHoldResponse>('/seats/auto-assign-hold', dto),

  /** Best-effort early release — e.g. freeing an outbound hold when the return leg's auto-assign fails. */
  releaseHold: (holdId: string) => apiClient.delete(`/seats/hold/${holdId}`),

  createGroupBooking: (dto: CreateGroupBookingRequest) =>
    apiClient.post<CreateGroupBookingResponse>('/bookings/group', dto),

  // Guards against a non-array response the same way dashboardApi.getPaymentMethods /
  // paymentsApi.getMethods already do elsewhere in this app — never lets a bad/unexpected
  // response shape reach a caller expecting a plain array.
  getPaymentMethods: async (): Promise<SupportedPaymentMethod[]> => {
    try {
      const response = await apiClient.get<SupportedPaymentMethod[]>('/payments/methods');
      return Array.isArray(response) ? response : [];
    } catch {
      return [];
    }
  },

  initiatePayment: (dto: InitiatePaymentRequest) =>
    apiClient.post<InitiatePaymentResponse>('/payments/initiate', dto),
};