import { readFileSync } from 'fs';
import { join } from 'path';
import { afterEach, describe, expect, it, vi } from 'vitest';
import { RssAdapter } from './rss.adapter';

/**
 * Real, live-captured RSS fixtures (both fetched directly against the real
 * endpoints, 2026-07-23) — mirrors cosinex.adapter.spec.ts's fixture/mock
 * spec style. `service-bund-feed.xml` proves the pubDate-present,
 * numeric-HTML-entity-title shape; `subreport-elvis-feed.xml` proves the
 * pubDate-absent, CDATA-title shape (14-RESEARCH.md live captures).
 */
const FIXTURES_DIR = join(__dirname, '..', '__fixtures__');
const SERVICE_BUND_FIXTURE = readFileSync(
  join(FIXTURES_DIR, 'service-bund-feed.xml'),
  'utf8',
);
const SUBREPORT_ELVIS_FIXTURE = readFileSync(
  join(FIXTURES_DIR, 'subreport-elvis-feed.xml'),
  'utf8',
);

/** Minimal prisma-shaped fake — only `tenderRssFeedSource.findMany` is used by RssAdapter. */
function makeFakePrisma(feeds: any[] = []) {
  return {
    tenderRssFeedSource: {
      findMany: vi.fn(async () => feeds),
    },
  } as any;
}

/** Stubs global `fetch` to resolve with `xml` for every call (fan-out tests). */
function stubFetchResolvingXml(xmlByUrl: Record<string, string>): void {
  vi.stubGlobal(
    'fetch',
    vi.fn(async (url: string) => {
      const xml = xmlByUrl[url];
      if (xml === undefined) {
        return { ok: false, status: 404 } as Response;
      }
      const bytes = Buffer.from(xml, 'utf8');
      return {
        ok: true,
        status: 200,
        headers: new Headers({ 'content-length': String(bytes.byteLength) }),
        arrayBuffer: async () =>
          bytes.buffer.slice(bytes.byteOffset, bytes.byteOffset + bytes.byteLength),
      } as unknown as Response;
    }),
  );
}

describe('RssAdapter', () => {
  it('declares sourceType rss and the symbolic rss portal', () => {
    const adapter = new RssAdapter(makeFakePrisma());
    expect(adapter.sourceType).toBe('rss');
    expect(adapter.portals).toEqual(['rss']);
  });

  describe('parseFeed (pure, fixture-driven)', () => {
    it('parses service.bund.de items: sourceType/sourcePortal set, pubDate present, numeric HTML entities decoded in title', () => {
      const adapter = new RssAdapter(makeFakePrisma());

      const records = adapter.parseFeed(SERVICE_BUND_FIXTURE, 'service-bund');

      expect(records.length).toBeGreaterThanOrEqual(1);
      for (const record of records) {
        expect(record.sourceType).toBe('rss');
        expect(record.sourcePortal).toBe('service-bund');
        expect(record.sourceUrl).toMatch(/^https:\/\/www\.service\.bund\.de\//);
        expect(record.eformsPayload).toBeNull();
      }

      // First fixture item's title is numeric-HTML-entity-encoded
      // (`&#220;bermittlung...`), NOT CDATA — must decode to a real "Ü".
      const first = records[0];
      expect(first).toBeDefined();
      const payload = first!.ocdsPayload as { title: string };
      expect(payload.title).toMatch(/^Übermittlung von Bohrungsdaten/);
      expect(payload.title).not.toContain('&#');

      // Every service.bund.de fixture item carries a <pubDate>.
      expect(records.every((r) => r.publishedAt instanceof Date)).toBe(true);
    });

    it('uses the item guid as sourceNoticeId for service.bund.de (plain-text guid, no isPermaLink attribute)', () => {
      const adapter = new RssAdapter(makeFakePrisma());
      const records = adapter.parseFeed(SERVICE_BUND_FIXTURE, 'service-bund');

      const ids = records.map((r) => r.sourceNoticeId);
      expect(ids.every((id) => id.startsWith('https://'))).toBe(true);
      expect(new Set(ids).size).toBe(ids.length);
    });

    it('parses subreport-elvis items: publishedAt null (no item pubDate), title from CDATA, guid isPermaLink=false extracted as plain text', () => {
      const adapter = new RssAdapter(makeFakePrisma());

      const records = adapter.parseFeed(
        SUBREPORT_ELVIS_FIXTURE,
        'subreport-neuss',
      );

      expect(records.length).toBeGreaterThanOrEqual(1);
      for (const record of records) {
        expect(record.sourceType).toBe('rss');
        expect(record.sourcePortal).toBe('subreport-neuss');
        expect(record.publishedAt).toBeNull();
        expect(record.sourceUrl).toMatch(
          /^https:\/\/www\.subreport-elvis\.de\//,
        );
      }

      const first = records[0];
      expect(first).toBeDefined();
      // guid is `<guid isPermaLink="false">E73433797-558464</guid>` —
      // fast-xml-parser represents this as { '#text': ..., '@_isPermaLink': ... },
      // extractTagText must pull out the plain '#text' value.
      expect(first!.sourceNoticeId).toBe('E73433797-558464');

      const payload = first!.ocdsPayload as { title: string };
      expect(payload.title).toMatch(/^E73433797:/);
    });

    it('never carries description HTML into the record (V5 — no stored-XSS surface)', () => {
      const adapter = new RssAdapter(makeFakePrisma());
      const records = adapter.parseFeed(
        SUBREPORT_ELVIS_FIXTURE,
        'subreport-neuss',
      );

      for (const record of records) {
        const serialized = JSON.stringify(record.ocdsPayload);
        expect(serialized).not.toContain('<table>');
        expect(serialized).not.toContain('<a href');
      }
    });

    it('bare-minimum bag: buyerName/procedureType/deadlineAt always null (baseline mapping only, D-04/D-05)', () => {
      const adapter = new RssAdapter(makeFakePrisma());
      const records = adapter.parseFeed(SERVICE_BUND_FIXTURE, 'service-bund');

      for (const record of records) {
        const payload = record.ocdsPayload as {
          buyerName: string | null;
          procedureType: string | null;
          legalFramework: string | null;
          deadlineAt: string | null;
        };
        expect(payload.buyerName).toBeNull();
        expect(payload.procedureType).toBeNull();
        expect(payload.legalFramework).toBeNull();
        expect(payload.deadlineAt).toBeNull();
      }
    });

    it('returns [] for empty XML instead of throwing', () => {
      const adapter = new RssAdapter(makeFakePrisma());
      expect(adapter.parseFeed('', 'empty-feed')).toEqual([]);
    });

    it('returns [] for malformed XML instead of throwing', () => {
      const adapter = new RssAdapter(makeFakePrisma());
      expect(
        adapter.parseFeed('<rss><channel><item><title>', 'broken-feed'),
      ).toEqual([]);
    });

    it('returns [] for well-formed XML with no <item> at all', () => {
      const adapter = new RssAdapter(makeFakePrisma());
      const xml =
        '<?xml version="1.0"?><rss version="2.0"><channel><title>Empty</title></channel></rss>';
      expect(adapter.parseFeed(xml, 'no-items-feed')).toEqual([]);
    });

    it('skips a single item missing <link> without aborting the rest', () => {
      const adapter = new RssAdapter(makeFakePrisma());
      const xml = `<?xml version="1.0"?>
        <rss version="2.0"><channel>
          <item><title>Ohne Link</title><guid>no-link-guid</guid></item>
          <item><title>Mit Link</title><link>https://example.invalid/a</link><guid>with-link-guid</guid></item>
        </channel></rss>`;

      const records = adapter.parseFeed(xml, 'mixed-feed');

      expect(records).toHaveLength(1);
      expect(records[0]?.sourceNoticeId).toBe('with-link-guid');
    });

    it('falls back to sha256(link) for sourceNoticeId when guid is absent', () => {
      const adapter = new RssAdapter(makeFakePrisma());
      const xml = `<?xml version="1.0"?>
        <rss version="2.0"><channel>
          <item><title>No Guid</title><link>https://example.invalid/no-guid</link></item>
        </channel></rss>`;

      const records = adapter.parseFeed(xml, 'no-guid-feed');

      expect(records).toHaveLength(1);
      expect(records[0]?.sourceNoticeId).toMatch(/^[a-f0-9]{40}$/);
    });
  });

  describe('normalize() dispatch', () => {
    it("'rss' sourceType routes through TenderNormalizerService.normalizeBag() (proven end-to-end via tender-normalizer.service.spec.ts)", () => {
      // See tender-normalizer.service.spec.ts's "generic ocdsPayload bag"
      // describe block for the actual normalize() assertions — this spec
      // only proves RssAdapter's OWN output shape (parseFeed), not the
      // normalizer dispatch itself (kept in the normalizer's own spec file
      // to avoid duplicating TenderNormalizerService test infrastructure).
      const adapter = new RssAdapter(makeFakePrisma());
      expect(adapter.sourceType).toBe('rss');
    });
  });

  describe('fetchTenders (internal fan-out over active TenderRssFeedSource rows, Plan 14-02 Task 2)', () => {
    afterEach(() => {
      vi.unstubAllGlobals();
    });

    it('fetches and parses every active feed, fanning out over findMany({isActive:true})', async () => {
      const feeds = [
        { id: 'f1', url: 'https://service-bund.invalid/rss.xml', label: 'service-bund', isActive: true },
        { id: 'f2', url: 'https://subreport.invalid/rss.xml', label: 'subreport-neuss', isActive: true },
      ];
      const prisma = makeFakePrisma(feeds);
      stubFetchResolvingXml({
        'https://service-bund.invalid/rss.xml': SERVICE_BUND_FIXTURE,
        'https://subreport.invalid/rss.xml': SUBREPORT_ELVIS_FIXTURE,
      });
      const adapter = new RssAdapter(prisma);

      const records = await adapter.fetchTenders('2026-07-23');

      expect(prisma.tenderRssFeedSource.findMany).toHaveBeenCalledWith({
        where: { isActive: true },
      });
      const portals = new Set(records.map((r) => r.sourcePortal));
      expect(portals).toEqual(new Set(['service-bund', 'subreport-neuss']));
      expect(records.length).toBeGreaterThan(1);
    });

    it('catch-per-feed: a feed that fails to fetch is skipped, the other feed still resolves (D-01)', async () => {
      const feeds = [
        { id: 'f1', url: 'https://broken.invalid/rss.xml', label: 'broken', isActive: true },
        { id: 'f2', url: 'https://ok.invalid/rss.xml', label: 'ok-feed', isActive: true },
      ];
      const prisma = makeFakePrisma(feeds);
      stubFetchResolvingXml({
        'https://ok.invalid/rss.xml': SERVICE_BUND_FIXTURE,
        // 'broken.invalid' deliberately absent -> stub resolves 404 -> throws
      });
      const adapter = new RssAdapter(prisma);

      const records = await adapter.fetchTenders('2026-07-23');

      expect(records.every((r) => r.sourcePortal === 'ok-feed')).toBe(true);
      expect(records.length).toBeGreaterThanOrEqual(1);
    });

    it('returns [] when there are no active feeds', async () => {
      const prisma = makeFakePrisma([]);
      const adapter = new RssAdapter(prisma);

      const records = await adapter.fetchTenders('2026-07-23');

      expect(records).toEqual([]);
    });

    it('returns [] without throwing when a feed fetch throws (network error)', async () => {
      const feeds = [
        { id: 'f1', url: 'https://unreachable.invalid/rss.xml', label: 'unreachable', isActive: true },
      ];
      const prisma = makeFakePrisma(feeds);
      vi.stubGlobal(
        'fetch',
        vi.fn(async () => {
          throw new Error('network unreachable');
        }),
      );
      const adapter = new RssAdapter(prisma);

      const records = await adapter.fetchTenders('2026-07-23');

      expect(records).toEqual([]);
    });

    it('rejects a feed response exceeding the size ceiling (DoS mitigation, T-14-02-02)', async () => {
      const feeds = [
        { id: 'f1', url: 'https://huge.invalid/rss.xml', label: 'huge', isActive: true },
      ];
      const prisma = makeFakePrisma(feeds);
      vi.stubGlobal(
        'fetch',
        vi.fn(async () => {
          return {
            ok: true,
            status: 200,
            headers: new Headers({ 'content-length': String(11 * 1024 * 1024) }),
            arrayBuffer: async () => new ArrayBuffer(0),
          } as unknown as Response;
        }),
      );
      const adapter = new RssAdapter(prisma);

      const records = await adapter.fetchTenders('2026-07-23');

      expect(records).toEqual([]); // oversized feed skipped, catch-per-feed (D-01)
    });
  });

  it('never imports or uses axios (native fetch is the sole HTTP client convention)', () => {
    const source = readFileSync(join(__dirname, 'rss.adapter.ts'), 'utf8');
    expect(source).not.toMatch(/from ['"]axios['"]/);
  });
});