import { describe, it, expect } from 'vitest';
import { canonicalHash, mapFlightToReservation, normalizeFlight } from '../../../src/services/airtrail/airtrailMapper';
import type { AirtrailFlightRaw } from '../../../src/services/airtrail/airtrailClient';

function airport(over: Partial<AirtrailFlightRaw['from']> = {}): NonNullable<AirtrailFlightRaw['from']> {
  return {
    id: 1,
    icao: 'KJFK',
    iata: 'JFK',
    name: 'John F. Kennedy Intl.',
    lat: 40.6413,
    lon: -73.7781,
    tz: 'America/New_York',
    country: 'US',
    ...over,
  };
}

function flight(over: Partial<AirtrailFlightRaw> = {}): AirtrailFlightRaw {
  return {
    id: 42,
    from: airport(),
    to: airport({ id: 2, icao: 'EGLL', iata: 'LHR', name: 'London Heathrow', lat: 51.4706, lon: -0.4619, tz: 'Europe/London' }),
    date: '2021-09-01',
    datePrecision: 'day',
    // Actual times (delayed) — TREK must IGNORE these and read the scheduled times.
    departure: '2021-09-01T23:42:00.000+00:00',
    arrival: '2021-09-02T07:42:00.000+00:00',
    departureScheduled: '2021-09-01T23:00:00.000+00:00', // 19:00 local at JFK (EDT, UTC-4)
    arrivalScheduled: '2021-09-02T07:00:00.000+00:00', // 08:00 local at LHR (BST, UTC+1)
    airline: { id: 1, icao: 'BAW', iata: 'BA', name: 'British Airways' },
    flightNumber: 'BA178',
    aircraft: { id: 1, icao: 'B772', name: 'Boeing 777' },
    aircraftReg: 'G-VIIL',
    flightReason: 'leisure',
    note: 'window seat',
    seats: [{ userId: 'u1', guestName: null, seat: 'window', seatNumber: '12A', seatClass: 'economy' }],
    ...over,
  };
}

describe('airtrailMapper.normalizeFlight', () => {
  it('prefers IATA codes and exposes the picker fields', () => {
    const n = normalizeFlight(flight());
    expect(n).toMatchObject({
      id: '42',
      fromCode: 'JFK',
      toCode: 'LHR',
      date: '2021-09-01',
      airline: 'BAW',
      flightNumber: 'BA178',
      seatClass: 'economy',
    });
    // The picker preview surfaces the scheduled times, not the actual ones.
    expect(n.departure).toBe('2021-09-01T23:00:00.000+00:00');
    expect(n.arrival).toBe('2021-09-02T07:00:00.000+00:00');
  });

  it('falls back to ICAO when IATA is missing and tolerates null airports', () => {
    const n = normalizeFlight(flight({ from: airport({ iata: null }), to: null }));
    expect(n.fromCode).toBe('KJFK');
    expect(n.toCode).toBeNull();
    expect(n.toName).toBeNull();
  });
});

describe('airtrailMapper.mapFlightToReservation', () => {
  it('composes airport-local times from the SCHEDULED instant + airport tz', () => {
    const m = mapFlightToReservation(flight());
    // Scheduled 23:00 UTC at JFK in September is 19:00 EDT; date stays the AirTrail local date.
    // (The actual times in the fixture are 23:42/07:42 — proving they are ignored.)
    expect(m.reservation_time).toBe('2021-09-01T19:00');
    // Scheduled 07:00 UTC at LHR in September is 08:00 BST.
    expect(m.reservation_end_time).toBe('2021-09-02T08:00');
  });

  it('leaves the clock blank (date only) when the flight has no scheduled time', () => {
    const m = mapFlightToReservation(flight({ departureScheduled: null, arrivalScheduled: null }));
    // Date is preserved from the AirTrail canonical date; no fabricated 00:00.
    expect(m.reservation_time).toBe('2021-09-01');
    expect(m.reservation_end_time).toBeNull();
    expect(m.endpoints.find(e => e.role === 'from')?.local_time).toBeNull();
    expect(m.endpoints.find(e => e.role === 'to')?.local_time).toBeNull();
  });

  it('builds two endpoints with codes, coords and timezones', () => {
    const m = mapFlightToReservation(flight());
    expect(m.endpoints).toHaveLength(2);
    expect(m.endpoints[0]).toMatchObject({ role: 'from', code: 'JFK', lat: 40.6413, timezone: 'America/New_York', local_date: '2021-09-01', local_time: '19:00' });
    expect(m.endpoints[1]).toMatchObject({ role: 'to', code: 'LHR', timezone: 'Europe/London', local_time: '08:00' });
    expect(m.needs_review).toBe(0);
  });

  it('titles from the flight number, else the route', () => {
    expect(mapFlightToReservation(flight()).title).toBe('BA178');
    expect(mapFlightToReservation(flight({ airline: null, flightNumber: null })).title).toBe('JFK → LHR');
  });

  it('carries flight metadata', () => {
    const m = mapFlightToReservation(flight());
    expect(m.metadata).toMatchObject({ airline: 'BAW', flight_number: 'BA178', aircraft: 'B772', aircraft_reg: 'G-VIIL', flight_reason: 'leisure', seat: '12A' });
    expect(m.type).toBe('flight');
    expect(m.status).toBe('confirmed');
    expect(m.notes).toBe('window seat');
  });

  it('uses only the seat number for the seat, not the cabin class (#1246)', () => {
    // AirTrail often has a class but no seat number until check-in; the class
    // must not leak into the seat field.
    const m = mapFlightToReservation(
      flight({ seats: [{ userId: 'u1', guestName: null, seat: null, seatNumber: null, seatClass: 'economy' }] }),
    );
    expect(m.metadata).not.toHaveProperty('seat');
  });

  it('keeps the seat number when present even with no class', () => {
    const m = mapFlightToReservation(
      flight({ seats: [{ userId: 'u1', guestName: null, seat: null, seatNumber: '3F', seatClass: null }] }),
    );
    expect(m.metadata).toMatchObject({ seat: '3F' });
  });

  it('omits the seat for a flight with no seats', () => {
    expect(mapFlightToReservation(flight({ seats: [] })).metadata).not.toHaveProperty('seat');
  });

  it('flags needs_review for a non-day date precision', () => {
    expect(mapFlightToReservation(flight({ datePrecision: 'month' })).needs_review).toBe(1);
  });

  it('flags needs_review and drops the endpoint when an airport has no coordinates', () => {
    const m = mapFlightToReservation(flight({ from: airport({ lat: null, lon: null }) }));
    expect(m.needs_review).toBe(1);
    expect(m.endpoints.find(e => e.role === 'from')).toBeUndefined();
    expect(m.endpoints.find(e => e.role === 'to')).toBeDefined();
  });

  it('leaves the end time null for a partial flight with no scheduled arrival', () => {
    const m = mapFlightToReservation(flight({ arrivalScheduled: null }));
    expect(m.reservation_end_time).toBeNull();
    expect(m.reservation_time).toBe('2021-09-01T19:00');
  });
});

describe('airtrailMapper.canonicalHash', () => {
  it('is stable for the same flight', () => {
    expect(canonicalHash(flight())).toBe(canonicalHash(flight()));
  });

  it('changes when a meaningful field changes', () => {
    expect(canonicalHash(flight())).not.toBe(canonicalHash(flight({ flightNumber: 'BA179' })));
    expect(canonicalHash(flight())).not.toBe(canonicalHash(flight({ note: 'aisle seat' })));
  });

  it('tracks the scheduled time and ignores actual-time changes', () => {
    // A scheduled-time change is what TREK imports, so it must re-sync...
    expect(canonicalHash(flight())).not.toBe(
      canonicalHash(flight({ departureScheduled: '2021-09-01T22:00:00.000+00:00' })),
    );
    // ...but a change to the actual time alone must not (TREK never shows it).
    expect(canonicalHash(flight())).toBe(
      canonicalHash(flight({ departure: '2021-09-01T20:00:00.000+00:00', arrival: '2021-09-02T05:00:00.000+00:00' })),
    );
  });

  it('is independent of seat ordering', () => {
    const a = flight({
      seats: [
        { userId: 'u1', guestName: null, seat: null, seatNumber: '1A', seatClass: 'economy' },
        { userId: 'u2', guestName: null, seat: null, seatNumber: '1B', seatClass: 'economy' },
      ],
    });
    const b = flight({
      seats: [
        { userId: 'u2', guestName: null, seat: null, seatNumber: '1B', seatClass: 'economy' },
        { userId: 'u1', guestName: null, seat: null, seatNumber: '1A', seatClass: 'economy' },
      ],
    });
    expect(canonicalHash(a)).toBe(canonicalHash(b));
  });
});