const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('fs');

const { createPlayerPlaylistService } = require('../src/player/playlist');

function createFsStub() {
  const original = {
    readFile: fs.promises.readFile,
    writeFile: fs.promises.writeFile,
    mkdir: fs.promises.mkdir
  };
  const calls = [];

  fs.promises.readFile = async function (filePath) {
    calls.push({ method: 'readFile', filePath });
    if (filePath.endsWith('fallback.json')) {
      return JSON.stringify({ fromSnapshot: true, screen: { slug: 'test2' } });
    }
    const error = new Error('missing');
    error.code = 'ENOENT';
    throw error;
  };

  fs.promises.writeFile = async function (filePath, content) {
    calls.push({ method: 'writeFile', filePath, content });
  };

  fs.promises.mkdir = async function (dirPath, options) {
    calls.push({ method: 'mkdir', dirPath, options });
  };

  return {
    calls,
    restore() {
      fs.promises.readFile = original.readFile;
      fs.promises.writeFile = original.writeFile;
      fs.promises.mkdir = original.mkdir;
    }
  };
}

test('buildScreenPlaylist assembles slides, templates, and derived values', async () => {
  const pool = {
    async query(sql, params) {
      if (sql.includes('FROM d_screens')) {
        assert.deepEqual(params, ['test2']);
        return [[{ id: 7, name: 'Screen 7', slug: 'test2', playlist_id: 22, modified_at: '2026-08-03T00:00:00.000Z' }]];
      }
      if (sql.includes('FROM c_playlists')) {
        assert.deepEqual(params, [22]);
        return [[{ id: 22, name: 'Playlist 22', fade_between_slides: 1, skip_unavailable_rtmp: 0, modified_at: '2026-08-02T00:00:00.000Z' }]];
      }
      if (sql.includes('FROM c_playlist_slides ps')) {
        return [[{
          id: 101,
          title: 'Intro',
          template_id: 33,
          content_json: '{"videoRegion":{"type":"video","duration_seconds":12.3456},"textRegion":{"type":"text","value":"Hello"},"qrRegion":{"type":"qr-code","value":"https://example.com"}}',
          modified_at: '2026-08-03T00:00:01.000Z',
          position: 1,
          duration_seconds: 9,
          use_video_duration: 1,
          disable_audio: null,
          template_name: 'Template 33',
          canvas_size_name: 'HD',
          canvas_size_width: 1920,
          canvas_size_height: 1080,
          canvas_width: 1920,
          canvas_height: 1080
        }]];
      }
      if (sql.includes('FROM c_playlist_slide_schedule_rules')) {
        return [[
          { id: 500, playlist_slide_id: 101, position: 1, start_datetime: null, end_datetime: null, start_time: '08:00', end_time: '12:00', schedule_days_json: '[1,2,3]' },
          { id: 501, playlist_slide_id: 101, position: 2, start_datetime: null, end_datetime: null, start_time: '13:00', end_time: '17:00', schedule_days_json: '[4,5]' }
        ]];
      }
      if (sql.includes('FROM c_templates st')) {
        assert.deepEqual(params, [[33]]);
        return [[{ id: 33, name: 'Template 33', canvas_size_id: 4, canvas_size_width: 1920, canvas_size_height: 1080, background_image_path: '/media/bg.png', background_color: '#111111', modified_at: '2026-08-03T00:00:02.000Z' }]];
      }
      if (sql.includes('FROM c_template_regions')) {
        assert.deepEqual(params, [[33]]);
        return [[{ id: 900, template_id: 33, region_key: 'textRegion', region_type: 'text', label: 'Text Region', font_family: 'Arial', x: 10, y: 20, width: 300, height: 200, z_index: 1, modified_at: '2026-08-03T00:00:03.000Z' }]];
      }
      throw new Error(`unexpected query: ${sql}`);
    }
  };
  const common = {
    parseJsonSafe(value) {
      return JSON.parse(value);
    },
    fetchRssFeedsData: async () => ({ rssFeeds: [{ id: 1, title: 'Feed 1' }] }),
    fetchRssFeedItemsByFeedId: async () => ([{ title: 'Item 1', link: 'https://example.com' }]),
    normalizeRssFeedItem(item) {
      return Object.assign({}, item, { normalized: true });
    },
    fetchApiSourcesData: async () => ({ apiSources: [{ id: 2, name: 'Source 2', last_response_json: '{"ok":true}' }] }),
    fetchTimetablesData: async () => ({ timetableGroups: [{ id: 3, name: 'Group 3' }] })
  };
  const fsStub = createFsStub();

  try {
    const service = createPlayerPlaylistService({ pool, common, snapshotDir: 'C:\\tmp\\snapshots' });
    const payload = await service.buildScreenPlaylist('test2');

    assert.equal(payload.screen.slug, 'test2');
    assert.equal(payload.playlist.name, 'Playlist 22');
    assert.equal(payload.slides[0].duration_seconds, 12.346);
    assert.equal(payload.slides[0].disable_audio, true);
    assert.equal(payload.slides[0].content.videoRegion.disable_audio, true);
    assert.equal(payload.slides[0].content.videoRegion.cache_bust, '2026-08-03T00:00:01.000Z');
    assert.equal(typeof payload.slides[0].content.qrRegion.qr_preview, 'string');
    assert.match(payload.slides[0].content.qrRegion.qr_preview, /^data:image\/svg\+xml/);
    assert.equal(payload.slides[0].scheduleRules.length, 2);
    assert.equal(payload.slides[0].template.regions[0].label, 'Text Region');
    assert.equal(payload.rssFeeds[0].items[0].normalized, true);
    assert.deepEqual(payload.apiSources[0].responseJson, { ok: true });
    assert.deepEqual(payload.timetableGroups, [{ id: 3, name: 'Group 3' }]);
    assert.match(payload.revision, /^[a-f0-9]{40}$/);
    assert.ok(fsStub.calls.some((call) => call.method === 'writeFile'));
  } finally {
    fsStub.restore();
  }
});

test('buildScreenPlaylist falls back to a snapshot when queries fail', async () => {
  const pool = {
    async query() {
      throw new Error('database unavailable');
    }
  };
  const common = {
    parseJsonSafe() {
      throw new Error('not expected');
    }
  };
  const fsStub = createFsStub();

  try {
    const service = createPlayerPlaylistService({ pool, common, snapshotDir: 'C:\\tmp\\snapshots' });
    const payload = await service.buildScreenPlaylist('fallback');

    assert.deepEqual(payload, { fromSnapshot: true, screen: { slug: 'test2' } });
    assert.ok(fsStub.calls.some((call) => call.method === 'readFile'));
  } finally {
    fsStub.restore();
  }
});