import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import { createServer, type Server } from 'node:http';
import type { AddressInfo } from 'node:net';
import { openInMemoryForTest } from '../../src/lib/server/db';
import { addDomain } from '../../src/lib/server/domains/repository';
import { searchWeb } from '../../src/lib/server/search/searxng';

let server: Server;
let baseUrl: string;

function respondWith(results: Record<string, unknown>[]) {
  server.on('request', (_req, res) => {
    res.writeHead(200, { 'content-type': 'application/json' });
    res.end(JSON.stringify({ results }));
  });
}

beforeEach(async () => {
  server = createServer();
  await new Promise<void>((r) => server.listen(0, '127.0.0.1', r));
  const addr = server.address() as AddressInfo;
  baseUrl = `http://127.0.0.1:${addr.port}`;
});

afterEach(async () => {
  await new Promise<void>((r) => server.close(() => r()));
});

describe('searchWeb', () => {
  it('filters results by whitelist', async () => {
    const db = openInMemoryForTest();
    addDomain(db, 'chefkoch.de');
    respondWith([
      {
        url: 'https://www.chefkoch.de/rezepte/123/a.html',
        title: 'Carbonara',
        content: 'Pasta'
      },
      {
        url: 'https://fake.de/x',
        title: 'Not allowed',
        content: 'blocked'
      }
    ]);
    const hits = await searchWeb(db, 'carbonara', { searxngUrl: baseUrl, enrichThumbnails: false });
    expect(hits.length).toBe(1);
    expect(hits[0].domain).toBe('chefkoch.de');
    expect(hits[0].title).toBe('Carbonara');
  });

  it('dedupes identical URLs', async () => {
    const db = openInMemoryForTest();
    addDomain(db, 'chefkoch.de');
    respondWith([
      { url: 'https://www.chefkoch.de/a', title: 'A', content: '' },
      { url: 'https://www.chefkoch.de/a', title: 'A dup', content: '' }
    ]);
    const hits = await searchWeb(db, 'a', { searxngUrl: baseUrl, enrichThumbnails: false });
    expect(hits.length).toBe(1);
  });

  it('returns empty list when no domains configured', async () => {
    const db = openInMemoryForTest();
    const hits = await searchWeb(db, 'x', { searxngUrl: baseUrl, enrichThumbnails: false });
    expect(hits).toEqual([]);
  });

  it('returns empty for empty query', async () => {
    const db = openInMemoryForTest();
    addDomain(db, 'chefkoch.de');
    const hits = await searchWeb(db, '   ', { searxngUrl: baseUrl, enrichThumbnails: false });
    expect(hits).toEqual([]);
  });

  it('domain filter restricts site:-query to supplied subset', async () => {
    const db = openInMemoryForTest();
    addDomain(db, 'chefkoch.de');
    addDomain(db, 'rezeptwelt.de');
    let receivedQ: string | null = null;
    server.on('request', (req, res) => {
      const u = new URL(req.url ?? '/', 'http://localhost');
      receivedQ = u.searchParams.get('q');
      res.writeHead(200, { 'content-type': 'application/json' });
      res.end(JSON.stringify({ results: [] }));
    });
    await searchWeb(db, 'apfel', {
      searxngUrl: baseUrl,
      enrichThumbnails: false,
      domains: ['rezeptwelt.de']
    });
    expect(receivedQ).toMatch(/site:rezeptwelt\.de/);
    expect(receivedQ).not.toMatch(/site:chefkoch\.de/);
  });

  it('ignores domain filter entries that are not in whitelist', async () => {
    const db = openInMemoryForTest();
    addDomain(db, 'chefkoch.de');
    let receivedQ: string | null = null;
    server.on('request', (req, res) => {
      const u = new URL(req.url ?? '/', 'http://localhost');
      receivedQ = u.searchParams.get('q');
      res.writeHead(200, { 'content-type': 'application/json' });
      res.end(JSON.stringify({ results: [] }));
    });
    // Only "evil.com" requested — not in whitelist → fall back to full whitelist.
    await searchWeb(db, 'x', {
      searxngUrl: baseUrl,
      enrichThumbnails: false,
      domains: ['evil.com']
    });
    expect(receivedQ).toMatch(/site:chefkoch\.de/);
    expect(receivedQ).not.toMatch(/site:evil\.com/);
  });

  it('passes pageno to SearXNG when > 1', async () => {
    const db = openInMemoryForTest();
    addDomain(db, 'chefkoch.de');
    let receivedPageno: string | null = 'not set';
    server.on('request', (req, res) => {
      const u = new URL(req.url ?? '/', 'http://localhost');
      receivedPageno = u.searchParams.get('pageno');
      res.writeHead(200, { 'content-type': 'application/json' });
      res.end(JSON.stringify({ results: [] }));
    });
    await searchWeb(db, 'x', { searxngUrl: baseUrl, enrichThumbnails: false, pageno: 3 });
    expect(receivedPageno).toBe('3');
  });

  it('omits pageno param when 1', async () => {
    const db = openInMemoryForTest();
    addDomain(db, 'chefkoch.de');
    let receivedPageno: string | null = 'not set';
    server.on('request', (req, res) => {
      const u = new URL(req.url ?? '/', 'http://localhost');
      receivedPageno = u.searchParams.get('pageno');
      res.writeHead(200, { 'content-type': 'application/json' });
      res.end(JSON.stringify({ results: [] }));
    });
    await searchWeb(db, 'x', { searxngUrl: baseUrl, enrichThumbnails: false });
    expect(receivedPageno).toBe(null);
  });

  it('drops hits whose page lacks a Recipe JSON-LD', async () => {
    const pageServer = createServer((req, res) => {
      res.writeHead(200, { 'content-type': 'text/html; charset=utf-8' });
      if (req.url === '/with-recipe') {
        res.end(`<html><head>
          <script type="application/ld+json">${JSON.stringify({
            '@type': 'Recipe',
            name: 'Pie',
            image: 'https://cdn.example/pie.jpg'
          })}</script>
        </head></html>`);
      } else {
        // forum page: no Recipe JSON-LD
        res.end('<html><head><title>Forum</title></head><body>Diskussion</body></html>');
      }
    });
    await new Promise<void>((r) => pageServer.listen(0, '127.0.0.1', r));
    const addr = pageServer.address() as AddressInfo;
    try {
      const db = openInMemoryForTest();
      addDomain(db, '127.0.0.1');
      respondWith([
        { url: `http://127.0.0.1:${addr.port}/with-recipe`, title: 'Recipe', content: '' },
        { url: `http://127.0.0.1:${addr.port}/forum-thread`, title: 'Forum', content: '' }
      ]);
      const hits = await searchWeb(db, 'x', { searxngUrl: baseUrl });
      expect(hits.length).toBe(1);
      expect(hits[0].url.endsWith('/with-recipe')).toBe(true);
    } finally {
      await new Promise<void>((r) => pageServer.close(() => r()));
    }
  });

  it('keeps hit when page fetch fails (unknown recipe status)', async () => {
    const db = openInMemoryForTest();
    addDomain(db, '127.0.0.1');
    // URL points to a port nobody listens on → fetch fails
    respondWith([
      { url: 'http://127.0.0.1:1/unreachable', title: 'Unreachable', content: '' }
    ]);
    const hits = await searchWeb(db, 'x', { searxngUrl: baseUrl });
    expect(hits.length).toBe(1);
  });

  // Minimal Recipe-JSON-LD stub so enrichAndFilterHits doesn't drop test hits
  // as non-recipe pages. Used in tests that focus on thumbnail extraction.
  const RECIPE_LD = `<script type="application/ld+json">${JSON.stringify({
    '@type': 'Recipe',
    name: 'stub'
  })}</script>`;

  it('enriches missing thumbnails from og:image', async () => {
    const pageServer = createServer((_req, res) => {
      res.writeHead(200, { 'content-type': 'text/html; charset=utf-8' });
      res.end(
        `<html><head><meta property="og:image" content="https://cdn.example/foo.jpg" />${RECIPE_LD}</head><body></body></html>`
      );
    });
    await new Promise<void>((r) => pageServer.listen(0, '127.0.0.1', r));
    const addr = pageServer.address() as AddressInfo;
    const pageUrl = `http://127.0.0.1:${addr.port}/rezept`;
    try {
      const db = openInMemoryForTest();
      addDomain(db, '127.0.0.1');
      respondWith([{ url: pageUrl, title: 'Kuchen', content: '' }]);
      const hits = await searchWeb(db, 'kuchen', { searxngUrl: baseUrl });
      expect(hits.length).toBe(1);
      expect(hits[0].thumbnail).toBe('https://cdn.example/foo.jpg');
    } finally {
      await new Promise<void>((r) => pageServer.close(() => r()));
    }
  });

  it('falls back to JSON-LD image when no og:image', async () => {
    const pageServer = createServer((_req, res) => {
      res.writeHead(200, { 'content-type': 'text/html; charset=utf-8' });
      res.end(`<html><head>
        <script type="application/ld+json">${JSON.stringify({
          '@type': 'Recipe',
          name: 'Pie',
          image: 'https://cdn.example/pie.jpg'
        })}</script>
      </head><body></body></html>`);
    });
    await new Promise<void>((r) => pageServer.listen(0, '127.0.0.1', r));
    const addr = pageServer.address() as AddressInfo;
    const pageUrl = `http://127.0.0.1:${addr.port}/pie`;
    try {
      const db = openInMemoryForTest();
      addDomain(db, '127.0.0.1');
      respondWith([{ url: pageUrl, title: 'Pie', content: '' }]);
      const hits = await searchWeb(db, 'pie', { searxngUrl: baseUrl });
      expect(hits[0].thumbnail).toBe('https://cdn.example/pie.jpg');
    } finally {
      await new Promise<void>((r) => pageServer.close(() => r()));
    }
  });

  it('falls back to first content image when no meta/JSON-LD image', async () => {
    const pageServer = createServer((_req, res) => {
      res.writeHead(200, { 'content-type': 'text/html; charset=utf-8' });
      res.end(
        `<html><head>${RECIPE_LD}</head><body><article><img src="/uploads/dish.jpg" alt=""></article></body></html>`
      );
    });
    await new Promise<void>((r) => pageServer.listen(0, '127.0.0.1', r));
    const addr = pageServer.address() as AddressInfo;
    const pageUrl = `http://127.0.0.1:${addr.port}/article`;
    try {
      const db = openInMemoryForTest();
      addDomain(db, '127.0.0.1');
      respondWith([{ url: pageUrl, title: 'Dish', content: '' }]);
      const hits = await searchWeb(db, 'dish', { searxngUrl: baseUrl });
      expect(hits[0].thumbnail).toBe(`http://127.0.0.1:${addr.port}/uploads/dish.jpg`);
    } finally {
      await new Promise<void>((r) => pageServer.close(() => r()));
    }
  });

  it('upgrades low-res SearXNG thumbnail with HQ og:image from page', async () => {
    const pageServer = createServer((_req, res) => {
      res.writeHead(200, { 'content-type': 'text/html; charset=utf-8' });
      res.end(
        `<html><head><meta property="og:image" content="https://cdn.example/hq.jpg" />${RECIPE_LD}</head></html>`
      );
    });
    await new Promise<void>((r) => pageServer.listen(0, '127.0.0.1', r));
    const addr = pageServer.address() as AddressInfo;
    const pageUrl = `http://127.0.0.1:${addr.port}/dish`;
    try {
      const db = openInMemoryForTest();
      addDomain(db, '127.0.0.1');
      respondWith([
        { url: pageUrl, title: 'Dish', thumbnail: 'https://searxng-cdn/small-thumb.jpg' }
      ]);
      const hits = await searchWeb(db, 'dish', { searxngUrl: baseUrl });
      expect(hits[0].thumbnail).toBe('https://cdn.example/hq.jpg');
    } finally {
      await new Promise<void>((r) => pageServer.close(() => r()));
    }
  });

  it('keeps SearXNG thumbnail when page has no image', async () => {
    const pageServer = createServer((_req, res) => {
      res.writeHead(200, { 'content-type': 'text/html; charset=utf-8' });
      res.end(`<html><head>${RECIPE_LD}</head><body>no images here</body></html>`);
    });
    await new Promise<void>((r) => pageServer.listen(0, '127.0.0.1', r));
    const addr = pageServer.address() as AddressInfo;
    const pageUrl = `http://127.0.0.1:${addr.port}/noimg`;
    try {
      const db = openInMemoryForTest();
      addDomain(db, '127.0.0.1');
      respondWith([
        { url: pageUrl, title: 'X', thumbnail: 'https://searxng-cdn/fallback.jpg' }
      ]);
      const hits = await searchWeb(db, 'x', { searxngUrl: baseUrl });
      expect(hits[0].thumbnail).toBe('https://searxng-cdn/fallback.jpg');
    } finally {
      await new Promise<void>((r) => pageServer.close(() => r()));
    }
  });

  it('SQLite cache: second search does not re-fetch the page', async () => {
    let pageHits = 0;
    const pageServer = createServer((_req, res) => {
      pageHits += 1;
      res.writeHead(200, { 'content-type': 'text/html; charset=utf-8' });
      res.end(`<html><head><meta property="og:image" content="https://cdn.example/c.jpg">${RECIPE_LD}</head></html>`);
    });
    await new Promise<void>((r) => pageServer.listen(0, '127.0.0.1', r));
    const addr = pageServer.address() as AddressInfo;
    const pageUrl = `http://127.0.0.1:${addr.port}/cached`;
    try {
      const db = openInMemoryForTest();
      addDomain(db, '127.0.0.1');
      respondWith([{ url: pageUrl, title: 'C', content: '' }]);
      const first = await searchWeb(db, 'c', { searxngUrl: baseUrl });
      const second = await searchWeb(db, 'c', { searxngUrl: baseUrl });
      expect(first[0].thumbnail).toBe('https://cdn.example/c.jpg');
      expect(second[0].thumbnail).toBe('https://cdn.example/c.jpg');
      expect(pageHits).toBe(1); // second call read from SQLite cache
      const row = db
        .prepare('SELECT image FROM thumbnail_cache WHERE url = ?')
        .get(pageUrl) as { image: string };
      expect(row.image).toBe('https://cdn.example/c.jpg');
    } finally {
      await new Promise<void>((r) => pageServer.close(() => r()));
    }
  });

  it('filters out forum/magazine/listing URLs', async () => {
    const db = openInMemoryForTest();
    addDomain(db, 'chefkoch.de');
    respondWith([
      { url: 'https://www.chefkoch.de/rezepte/123/Ravioli.html', title: 'Ravioli' },
      { url: 'https://www.chefkoch.de/forum/2,17,89865/ravioli.html', title: 'Forum Ravioli' },
      { url: 'https://www.chefkoch.de/magazin/artikel/x.html', title: 'Magazin' },
      { url: 'https://www.chefkoch.de/suche/ravioli', title: 'Suche' },
      { url: 'https://www.chefkoch.de/themen/ravioli/', title: 'Themen' },
      { url: 'https://www.chefkoch.de/rezepte/', title: 'Rezepte Übersicht' }
    ]);
    const hits = await searchWeb(db, 'ravioli', { searxngUrl: baseUrl, enrichThumbnails: false });
    expect(hits.length).toBe(1);
    expect(hits[0].title).toBe('Ravioli');
  });
});