import { describe, it, expect, vi, beforeEach } from 'vitest';
import { HttpException } from '@nestjs/common';
import type { Response } from 'express';
import { PassThrough } from 'node:stream';

import { MapsController } from '../../../src/nest/maps/maps.controller';
import type { MapsService } from '../../../src/nest/maps/maps.service';
import type { StorageService } from '../../../src/nest/storage/storage.service';
import type { User } from '../../../src/types';

const user = { id: 3 } as User;

// The bytes route is the only storage consumer; everything else ignores it.
const getStream = vi.fn();
const storageStub = { getStream } as unknown as StorageService;

function makeController(svc: Partial<MapsService>) {
  return new MapsController(svc as MapsService, storageStub);
}

/** Run an async handler, expecting an HttpException; return its { status, body }. */
async function thrown(fn: () => Promise<unknown>): Promise<{ status: number; body: unknown }> {
  try {
    await fn();
  } catch (err) {
    expect(err).toBeInstanceOf(HttpException);
    const e = err as HttpException;
    return { status: e.getStatus(), body: e.getResponse() };
  }
  throw new Error('expected the handler to throw');
}

function withError(status: number, message: string): Error {
  return Object.assign(new Error(message), { status });
}

beforeEach(() => {
  vi.spyOn(console, 'error').mockImplementation(() => {});
});

describe('MapsController (parity with the legacy /api/maps route)', () => {
  // Body validation (required query/input/url, locationBias shapes, input
  // length) moved to the @trek/shared maps schemas enforced by the global
  // ZodValidationPipe — the pipe's uniform envelope replaced the legacy
  // bespoke 400 strings, and the 400-status contract is pinned by the
  // integration/e2e suites. These unit cases cover the handler bodies only.
  describe('POST /search', () => {
    it('returns the service result', async () => {
      const search = vi.fn().mockResolvedValue({ places: [], source: 'osm' });
      const res = await makeController({ search }).search(user, { query: 'berlin' }, 'de');
      expect(res).toEqual({ places: [], source: 'osm' });
      expect(search).toHaveBeenCalledWith(3, 'berlin', 'de', undefined);
    });

    it('forwards a valid locationBias to the service', async () => {
      const search = vi.fn().mockResolvedValue({ places: [], source: 'osm' });
      const bias = { lat: 1, lng: 2, radius: 5000 };
      await makeController({ search }).search(user, { query: 'x', locationBias: bias }, 'de');
      expect(search).toHaveBeenCalledWith(3, 'x', 'de', bias);
    });

    it('maps a service error to its status + message', async () => {
      const search = vi.fn().mockRejectedValue(withError(429, 'Rate limited'));
      expect(await thrown(() => makeController({ search }).search(user, { query: 'x' }))).toEqual({
        status: 429, body: { error: 'Rate limited' },
      });
    });

    it('defaults a non-Error rejection to 500 + the fallback message', async () => {
      const search = vi.fn().mockRejectedValue('boom');
      expect(await thrown(() => makeController({ search }).search(user, { query: 'x' }))).toEqual({
        status: 500, body: { error: 'Search error' },
      });
    });
  });

  describe('GET /area', () => {
    const BOX = { minLat: 54, minLng: 12, maxLat: 54.2, maxLng: 12.3 };

    it('delegates a valid box with parsed numbers', async () => {
      const placesInArea = vi.fn().mockResolvedValue({ results: [{ name: 'x' }], truncated: false });
      const res = await makeController({ placesInArea }).area('54', '12', '54.2', '12.3');
      expect(res).toEqual({ results: [{ name: 'x' }], truncated: false });
      expect(placesInArea).toHaveBeenCalledWith(BOX, 2000);
    });

    it('400 when the box has a non-finite value', async () => {
      const placesInArea = vi.fn();
      expect(await thrown(() => makeController({ placesInArea }).area('x', '12', '54.2', '12.3'))).toEqual({
        status: 400,
        body: { error: 'A valid bbox (minLat, minLng, maxLat, maxLng) is required' },
      });
      expect(placesInArea).not.toHaveBeenCalled();
    });

    it('caps the limit rather than passing a caller number straight through', async () => {
      const placesInArea = vi.fn().mockResolvedValue({ results: [], truncated: false });
      await makeController({ placesInArea }).area('54', '12', '54.2', '12.3', '999999');
      expect(placesInArea).toHaveBeenCalledWith(BOX, 5000);
    });

    it('says the index is unavailable instead of failing the caller', async () => {
      // This runs inside an offline sync. A null here means the index is off or
      // unreachable, and the client caches nothing and carries on.
      const placesInArea = vi.fn().mockResolvedValue(null);
      const res = await makeController({ placesInArea }).area('54', '12', '54.2', '12.3');
      expect(res).toEqual({ results: [], truncated: false, unavailable: true });
    });
  });

  describe('GET /pois', () => {
    it('400 when category is missing', async () => {
      const pois = vi.fn();
      expect(await thrown(() => makeController({ pois }).pois(undefined, '1', '2', '3', '4'))).toEqual({
        status: 400, body: { error: 'A category is required' },
      });
      expect(pois).not.toHaveBeenCalled();
    });

    it('400 when the bbox has a non-finite value', async () => {
      const pois = vi.fn();
      expect(await thrown(() => makeController({ pois }).pois('cafe', 'x', '2', '3', '4'))).toEqual({
        status: 400, body: { error: 'A valid bbox (south, west, north, east) is required' },
      });
      expect(pois).not.toHaveBeenCalled();
    });

    it('delegates a valid request with a parsed numeric bbox and forwards lang', async () => {
      const pois = vi.fn().mockResolvedValue({ places: [] });
      const res = await makeController({ pois }).pois('cafe', '1', '2', '3', '4', 'fr');
      expect(res).toEqual({ places: [] });
      expect(pois).toHaveBeenCalledWith('cafe', { south: 1, west: 2, north: 3, east: 4 }, 'fr');
    });

    it('maps a service error, defaulting to 500', async () => {
      const pois = vi.fn().mockRejectedValue(new Error('Overpass down'));
      expect(await thrown(() => makeController({ pois }).pois('cafe', '1', '2', '3', '4'))).toEqual({
        status: 500, body: { error: 'Overpass down' },
      });
    });
  });

  describe('POST /autocomplete', () => {
    it('returns the disabled envelope when the kill-switch is off', async () => {
      const autocomplete = vi.fn();
      const res = await makeController({ autocompleteDisabled: () => true, autocomplete }).autocomplete(user, { input: 'be' });
      expect(res).toEqual({ suggestions: [], source: 'disabled' });
      expect(autocomplete).not.toHaveBeenCalled();
    });

    it('delegates a valid request', async () => {
      const autocomplete = vi.fn().mockResolvedValue({ suggestions: [], source: 'osm' });
      const bias = { low: { lat: 1, lng: 2 }, high: { lat: 3, lng: 4 } };
      await makeController({ autocompleteDisabled: () => false, autocomplete }).autocomplete(user, { input: 'be', lang: 'en', locationBias: bias });
      expect(autocomplete).toHaveBeenCalledWith(3, 'be', 'en', bias, undefined);
    });

    // Session tokens tie a search's keystrokes and its details lookup into one
    // Google billing session instead of charging each request.
    it('passes a session token through to the service', async () => {
      const autocomplete = vi.fn().mockResolvedValue({ suggestions: [], source: 'google' });
      await makeController({ autocompleteDisabled: () => false, autocomplete })
        .autocomplete(user, { input: 'be', sessionToken: 'abc123' });
      expect(autocomplete).toHaveBeenCalledWith(3, 'be', undefined, undefined, 'abc123');
    });

    it('maps a service error', async () => {
      const autocomplete = vi.fn().mockRejectedValue(withError(503, 'Upstream down'));
      const c = makeController({ autocompleteDisabled: () => false, autocomplete });
      expect(await thrown(() => c.autocomplete(user, { input: 'be' }))).toEqual({
        status: 503, body: { error: 'Upstream down' },
      });
    });
  });

  describe('GET /details/:placeId', () => {
    it('returns the disabled envelope when off', async () => {
      const res = await makeController({ detailsDisabled: () => true }).details(user, 'p1');
      expect(res).toEqual({ place: null, disabled: true });
    });

    it('uses the expanded lookup when expand is set', async () => {
      const detailsExpanded = vi.fn().mockResolvedValue({ place: { id: 'p1' } });
      const details = vi.fn();
      await makeController({ detailsDisabled: () => false, detailsExpanded, details })
        .details(user, 'p1', 'full', 'de', '1');
      expect(detailsExpanded).toHaveBeenCalledWith(3, 'p1', 'de', true);
      expect(details).not.toHaveBeenCalled();
    });

    it('uses the plain lookup without expand', async () => {
      const details = vi.fn().mockResolvedValue({ place: { id: 'p1' } });
      await makeController({ detailsDisabled: () => false, details }).details(user, 'p1', undefined, 'de');
      expect(details).toHaveBeenCalledWith(3, 'p1', 'de', undefined);
    });

    // The details query is not Zod-validated, so the token is shape-checked here
    // and a junk value degrades to per-request billing instead of reaching Google.
    it('forwards a well-formed session token and drops a malformed one', async () => {
      const details = vi.fn().mockResolvedValue({ place: { id: 'p1' } });
      const c = makeController({ detailsDisabled: () => false, details });

      await c.details(user, 'p1', undefined, 'de', undefined, 'a-b_C9');
      expect(details).toHaveBeenLastCalledWith(3, 'p1', 'de', 'a-b_C9');

      await c.details(user, 'p1', undefined, 'de', undefined, 'has spaces & symbols!');
      expect(details).toHaveBeenLastCalledWith(3, 'p1', 'de', undefined);

      await c.details(user, 'p1', undefined, 'de', undefined, 'x'.repeat(37));
      expect(details).toHaveBeenLastCalledWith(3, 'p1', 'de', undefined);
    });

    it('maps a service error', async () => {
      const details = vi.fn().mockRejectedValue(withError(404, 'Not found'));
      expect(await thrown(() => makeController({ detailsDisabled: () => false, details }).details(user, 'p1'))).toEqual({
        status: 404, body: { error: 'Not found' },
      });
    });
  });

  describe('GET /place-photo/:placeId', () => {
    it('returns { photoUrl: null } when photos are disabled (non-coords)', async () => {
      const photo = vi.fn();
      const res = await makeController({ photosDisabled: () => true, photo }).placePhoto(user, 'p1', '1', '2');
      expect(res).toEqual({ photoUrl: null });
      expect(photo).not.toHaveBeenCalled();
    });

    it('bypasses the kill-switch for coords: ids', async () => {
      const photo = vi.fn().mockResolvedValue({ photoUrl: 'u', attribution: null });
      await makeController({ photosDisabled: () => true, photo }).placePhoto(user, 'coords:1,2', '1', '2', 'Spot');
      expect(photo).toHaveBeenCalledWith(3, 'coords:1,2', 1, 2, 'Spot');
    });

    it('maps a 4xx service error', async () => {
      const photo = vi.fn().mockRejectedValue(withError(429, 'Rate limited'));
      expect(await thrown(() => makeController({ photosDisabled: () => false, photo }).placePhoto(user, 'p1', '1', '2'))).toEqual({
        status: 429, body: { error: 'Rate limited' },
      });
    });

    // A place without a photo is an empty result, not a 404 — one 404 per photo-less
    // place gets the user banned by any 404-rate IPS in front of TREK (#1727).
    it('passes a photo-less place through as a 200 with photoUrl null', async () => {
      const photo = vi.fn().mockResolvedValue({ photoUrl: null, attribution: null });
      const res = await makeController({ photosDisabled: () => false, photo }).placePhoto(user, 'node:123', '1', '2');
      expect(res).toEqual({ photoUrl: null, attribution: null });
    });

    it('logs and maps a 5xx service error', async () => {
      const photo = vi.fn().mockRejectedValue(withError(502, 'Upstream failed'));
      expect(await thrown(() => makeController({ photosDisabled: () => false, photo }).placePhoto(user, 'p1', '1', '2'))).toEqual({
        status: 502, body: { error: 'Upstream failed' },
      });
      expect(console.error).toHaveBeenCalledWith('Place photo error:', expect.any(Error));
    });

    it('defaults a status-less error to 500 and parses NaN coords', async () => {
      const photo = vi.fn().mockRejectedValue(new Error('Error fetching photo'));
      expect(await thrown(() => makeController({ photosDisabled: () => false, photo }).placePhoto(user, 'p1'))).toEqual({
        status: 500, body: { error: 'Error fetching photo' },
      });
      const [, , lat, lng] = photo.mock.calls[0];
      expect(Number.isNaN(lat)).toBe(true);
      expect(Number.isNaN(lng)).toBe(true);
    });
  });

  describe('GET /place-photo/:placeId/bytes', () => {
    // A real PassThrough (like storage.service.test.ts's makeRes) rather than
    // a { on, pipe } stub: pipeline() needs authentic stream/eos semantics
    // (close/error/finish wiring) that a bare mock can't satisfy.
    function makeRes() {
      const sink = new PassThrough();
      const chunks: Buffer[] = [];
      sink.on('data', (c: Buffer) => chunks.push(c));
      // Capture the real PassThrough#end BEFORE overwriting the property
      // below — res and sink are the same object (Object.assign mutates and
      // returns its target), so referencing sink.end inside the wrapper
      // would recurse into itself.
      const realEnd = sink.end.bind(sink) as (...a: unknown[]) => unknown;
      const res = Object.assign(sink, {
        statusCode: 200,
        status: vi.fn(function (this: unknown, c: number) { (res as { statusCode: number }).statusCode = c; return res; }),
        json: vi.fn(),
        set: vi.fn(),
        type: vi.fn(),
        end: vi.fn((...args: unknown[]) => realEnd(...args)),
        body: () => Buffer.concat(chunks).toString(),
      });
      return res as unknown as Response & {
        status: ReturnType<typeof vi.fn>;
        json: ReturnType<typeof vi.fn>;
        set: ReturnType<typeof vi.fn>;
        type: ReturnType<typeof vi.fn>;
        end: ReturnType<typeof vi.fn>;
        body: () => string;
      };
    }

    // Braced body on purpose: mockReset() returns the mock, and a function
    // returned from beforeEach is invoked as a teardown callback — which would
    // call getStream() bare and turn a mockRejectedValue impl into an
    // unhandled rejection.
    beforeEach(() => {
      getStream.mockReset();
    });

    // Places persist this URL in image_url, so an evicted cache entry means one
    // request per place on a trip render. 404 for each of them is the ban vector
    // from #1727 — an uncached photo answers 204 with an empty body instead.
    it('204 without a body when the photo is not cached', async () => {
      const res = makeRes();
      await makeController({ photoBytesKey: async () => null }).placePhotoBytes('p1', res);
      expect(res.status).toHaveBeenCalledWith(204);
      expect(res.end).toHaveBeenCalled();
      expect(res.json).not.toHaveBeenCalled();
      expect(getStream).not.toHaveBeenCalled();
    });

    it('streams the cached bytes with image/jpeg + an immutable cache header on a hit', async () => {
      const stream = new PassThrough();
      stream.end('hello');
      getStream.mockResolvedValue({ stream, stat: { key: 'photos/google/abc.jpg', size: 5, mtimeMs: 0 } });
      const res = makeRes();
      await makeController({ photoBytesKey: async () => 'abc.jpg' }).placePhotoBytes('p1', res);
      expect(res.set).toHaveBeenCalledWith('Cache-Control', 'public, max-age=2592000, immutable');
      expect(res.type).toHaveBeenCalledWith('image/jpeg');
      expect(getStream).toHaveBeenCalledWith('photos-google', 'abc.jpg');
      expect(res.body()).toBe('hello');
    });

    it('falls back to an empty 204 when the stream cannot be opened (cache-delete race)', async () => {
      getStream.mockRejectedValue(new Error('storage object not found'));
      const res = makeRes();
      await makeController({ photoBytesKey: async () => 'abc.jpg' }).placePhotoBytes('p1', res);
      expect(res.status).toHaveBeenCalledWith(204);
      expect(res.end).toHaveBeenCalled();
      // The hit path already asked for a month of immutable caching — that header
      // must not survive onto the empty answer, or the photo stays hidden once it
      // is back in the cache.
      expect(res.set).toHaveBeenLastCalledWith('Cache-Control', 'no-store');
    });

    it('falls back to an empty 204 when the stream errors before headers were flushed', async () => {
      const stream = new PassThrough();
      getStream.mockResolvedValue({ stream, stat: { key: 'photos/google/abc.jpg', size: 5, mtimeMs: 0 } });
      const res = makeRes();
      const pending = makeController({ photoBytesKey: async () => 'abc.jpg' }).placePhotoBytes('p1', res);
      // Let pipeline() attach its listeners before erroring the source, so
      // the event isn't missed to a scheduling race.
      await new Promise((resolve) => setImmediate(resolve));
      // No bytes reached res yet — pipeline rejects before any write.
      stream.destroy(new Error('source boom'));
      await pending;
      expect(res.status).toHaveBeenCalledWith(204);
      expect(res.end).toHaveBeenCalled();
      expect(res.set).toHaveBeenLastCalledWith('Cache-Control', 'no-store');
    });

    it('swallows an abort-like error once headers are flushed (client walked away)', async () => {
      const stream = new PassThrough();
      getStream.mockResolvedValue({ stream, stat: { key: 'photos/google/abc.jpg', size: 5, mtimeMs: 0 } });
      const res = makeRes();
      (res as unknown as { headersSent: boolean }).headersSent = true;
      const pending = makeController({ photoBytesKey: async () => 'abc.jpg' }).placePhotoBytes('p1', res);
      await new Promise((resolve) => setImmediate(resolve));
      stream.destroy(Object.assign(new Error('reset'), { code: 'ECONNRESET' }));
      await expect(pending).resolves.toBeUndefined();
      expect(res.status).not.toHaveBeenCalled();
      expect(res.end).not.toHaveBeenCalled();
    });

    it('re-throws a real (non-abort) error once headers are flushed', async () => {
      const stream = new PassThrough();
      getStream.mockResolvedValue({ stream, stat: { key: 'photos/google/abc.jpg', size: 5, mtimeMs: 0 } });
      const res = makeRes();
      (res as unknown as { headersSent: boolean }).headersSent = true;
      const pending = makeController({ photoBytesKey: async () => 'abc.jpg' }).placePhotoBytes('p1', res);
      await new Promise((resolve) => setImmediate(resolve));
      stream.destroy(Object.assign(new Error('disk read error'), { code: 'EIO' }));
      await expect(pending).rejects.toThrow('disk read error');
      expect(res.status).not.toHaveBeenCalled();
      expect(res.end).not.toHaveBeenCalled();
    });
  });

  describe('GET /reverse', () => {
    it('400 when lat/lng missing', async () => {
      expect(await thrown(() => makeController({}).reverse(undefined, '2'))).toEqual({
        status: 400, body: { error: 'lat and lng required' },
      });
    });

    it('returns the reverse result', async () => {
      const reverse = vi.fn().mockResolvedValue({ name: 'Spot', address: 'Street 1' });
      expect(await makeController({ reverse }).reverse('1', '2', 'de')).toEqual({ name: 'Spot', address: 'Street 1' });
    });

    it('swallows a failure into an empty result (no error)', async () => {
      const reverse = vi.fn().mockRejectedValue(new Error('boom'));
      expect(await makeController({ reverse }).reverse('1', '2')).toEqual({ name: null, address: null });
    });
  });

  describe('POST /resolve-url', () => {
    it('returns the resolved coordinates', async () => {
      const resolveUrl = vi.fn().mockResolvedValue({ lat: 1, lng: 2, name: null, address: null });
      expect(await makeController({ resolveUrl }).resolveUrl({ url: 'https://maps.app.goo.gl/x' })).toEqual({ lat: 1, lng: 2, name: null, address: null });
    });

    it('maps a service error, defaulting to 400', async () => {
      const resolveUrl = vi.fn().mockRejectedValue(new Error('Failed to resolve URL'));
      expect(await thrown(() => makeController({ resolveUrl }).resolveUrl({ url: 'bad' }))).toEqual({
        status: 400, body: { error: 'Failed to resolve URL' },
      });
    });

    it('honours an explicit status on the thrown error', async () => {
      const resolveUrl = vi.fn().mockRejectedValue(withError(422, 'Unsupported link'));
      expect(await thrown(() => makeController({ resolveUrl }).resolveUrl({ url: 'bad' }))).toEqual({
        status: 422, body: { error: 'Unsupported link' },
      });
    });

    it('falls back to the default message when a non-Error is thrown', async () => {
      const resolveUrl = vi.fn().mockRejectedValue('nope');
      expect(await thrown(() => makeController({ resolveUrl }).resolveUrl({ url: 'bad' }))).toEqual({
        status: 400, body: { error: 'Failed to resolve URL' },
      });
    });
  });

  describe('GET /reverse', () => {
    it('forwards lang through to the service', async () => {
      const reverse = vi.fn().mockResolvedValue({ name: null, address: null });
      await makeController({ reverse }).reverse('1', '2', 'fr');
      expect(reverse).toHaveBeenCalledWith('1', '2', 'fr');
    });
  });

  describe('GET /brand-logo/:wikidataId', () => {
    /** The same response double the photo-bytes cases use, minus their streaming. */
    function makeRes() {
      const sent: Buffer[] = [];
      const res = {
        statusCode: 200,
        status: vi.fn((c: number) => { res.statusCode = c; return res; }),
        set: vi.fn(),
        type: vi.fn(),
        send: vi.fn((b: Buffer) => { sent.push(b); return res; }),
        end: vi.fn(),
        json: vi.fn(),
        body: () => Buffer.concat(sent),
      };
      return res as unknown as Response & {
        status: ReturnType<typeof vi.fn>;
        set: ReturnType<typeof vi.fn>;
        type: ReturnType<typeof vi.fn>;
        send: ReturnType<typeof vi.fn>;
        end: ReturnType<typeof vi.fn>;
        body: () => Buffer;
      };
    }

    it('serves the flattened bytes with the type the service reports', async () => {
      const bytes = Buffer.from('89504e470d0a1a0a', 'hex');
      const brandLogo = vi.fn().mockResolvedValue({ bytes, contentType: 'image/png' });
      const res = makeRes();

      await makeController({ brandLogo }).brandLogo('Q565734', res);

      expect(brandLogo).toHaveBeenCalledWith('Q565734');
      expect(res.type).toHaveBeenCalledWith('image/png');
      expect(res.set).toHaveBeenCalledWith('Cache-Control', 'public, max-age=2592000, immutable');
      expect(res.body()).toEqual(bytes);
    });

    // A pin whose brand has no logo keeps its category icon. Answering 404 for each of
    // those is the ban vector from #1727 all over again — a map full of them is a burst
    // of 404s at the instance — so an unknown brand answers 204 with no body.
    it('204 without a body, and without an immutable header, when there is no logo', async () => {
      const res = makeRes();

      await makeController({ brandLogo: vi.fn().mockResolvedValue(null) }).brandLogo('Q1', res);

      expect(res.status).toHaveBeenCalledWith(204);
      expect(res.end).toHaveBeenCalled();
      expect(res.send).not.toHaveBeenCalled();
      // A brand whose logo appears later must not stay hidden behind a month-old empty.
      expect(res.set).toHaveBeenCalledWith('Cache-Control', 'no-store');
    });

    it('an id that is not a wikidata id is answered, not thrown at the caller', async () => {
      const brandLogo = vi.fn().mockResolvedValue(null);
      const res = makeRes();

      await makeController({ brandLogo }).brandLogo('../../etc/passwd', res);

      expect(res.status).toHaveBeenCalledWith(204);
      expect(brandLogo).toHaveBeenCalledWith('../../etc/passwd');
    });
  });
});