const express = require('express');
const fetch = require('node-fetch');
const path = require('path');
require('dotenv').config();

const VERSION = '1.3.0';
const app = express();
const PORT = process.env.PORT || 3000;

const IMMICH_URL = (process.env.IMMICH_URL || 'http://localhost:2283').replace(/\/+$/, '');
const API_KEY = process.env.IMMICH_API_KEY || '';
const SLIDESHOW_INTERVAL = parseInt(process.env.SLIDESHOW_INTERVAL, 10) || 30;
const TRANSITION_DURATION = parseInt(process.env.TRANSITION_DURATION, 10) || 2;
const SHOW_CLOCK = process.env.SHOW_CLOCK !== 'false';
const SHOW_DATE = process.env.SHOW_DATE !== 'false';
const SHOW_EXIF = process.env.SHOW_EXIF !== 'false';
const SHOW_PROGRESS = process.env.SHOW_PROGRESS !== 'false';
const IMAGE_FIT = process.env.IMAGE_FIT || 'contain';
const BACKGROUND_BLUR = process.env.BACKGROUND_BLUR !== 'false';
const SHUFFLE = process.env.SHUFFLE !== 'false';
const ALBUM_ID = process.env.ALBUM_ID || '';
const SHOW_FAVORITES_ONLY = process.env.SHOW_FAVORITES_ONLY === 'true';
const REFRESH_INTERVAL = parseInt(process.env.REFRESH_INTERVAL, 10) || 300;
const INCLUDE_VIDEOS = process.env.INCLUDE_VIDEOS !== 'false';

function immichHeaders() {
  return { 'x-api-key': API_KEY, 'Accept': 'application/json', 'Content-Type': 'application/json' };
}
function log(msg) { console.log('[Frambe] ' + msg); }
function logErr(msg) { console.error('[Frambe] ERROR: ' + msg); }

app.use('/api', (req, _res, next) => { log('API ' + req.method + ' ' + req.originalUrl); next(); });
app.use(express.static(path.join(__dirname, 'public'), {
  setHeaders: (res, filePath) => {
    if (filePath.endsWith('.html') || filePath.endsWith('.js') || filePath.endsWith('.css')) {
      res.setHeader('Cache-Control', 'no-cache, no-store, must-revalidate');
      res.setHeader('Pragma', 'no-cache'); res.setHeader('Expires', '0');
    }
  }
}));
app.use(express.json());

function mapAsset(a) {
  return {
    id: a.id, type: a.type, originalFileName: a.originalFileName, fileCreatedAt: a.fileCreatedAt, isFavorite: a.isFavorite,
    exifInfo: a.exifInfo ? { make: a.exifInfo.make, model: a.exifInfo.model, city: a.exifInfo.city, state: a.exifInfo.state, country: a.exifInfo.country, description: a.exifInfo.description, dateTimeOriginal: a.exifInfo.dateTimeOriginal } : null,
  };
}
function filterAssets(assets) {
  if (INCLUDE_VIDEOS) return assets.filter(a => a.type === 'IMAGE' || a.type === 'VIDEO');
  return assets.filter(a => a.type === 'IMAGE');
}

app.get('/api/config', (_req, res) => {
  res.json({ version: VERSION, slideshowInterval: SLIDESHOW_INTERVAL, transitionDuration: TRANSITION_DURATION, showClock: SHOW_CLOCK, showDate: SHOW_DATE, showExif: SHOW_EXIF, showProgress: SHOW_PROGRESS, imageFit: IMAGE_FIT, backgroundBlur: BACKGROUND_BLUR, shuffle: SHUFFLE, albumId: ALBUM_ID, showFavoritesOnly: SHOW_FAVORITES_ONLY, refreshInterval: REFRESH_INTERVAL, includeVideos: INCLUDE_VIDEOS, connected: !!API_KEY });
});

app.get('/api/server-info', async (_req, res) => {
  try { const r = await fetch(`${IMMICH_URL}/api/server/version`, { headers: immichHeaders() }); if (!r.ok) throw new Error(`Immich returned ${r.status}`); const v = await r.json(); log('Immich connection OK, version ' + v.major + '.' + v.minor + '.' + v.patch); res.json({ ok: true, version: v });
  } catch (err) { logErr('Immich connection failed: ' + err.message); res.status(502).json({ ok: false, error: err.message }); }
});

app.get('/api/albums', async (_req, res) => {
  try { const r = await fetch(`${IMMICH_URL}/api/albums`, { headers: immichHeaders() }); if (!r.ok) throw new Error(`Immich returned ${r.status}`); const albums = await r.json(); log('Listed ' + albums.length + ' albums'); res.json(albums.map(a => ({ id: a.id, albumName: a.albumName, assetCount: a.assetCount, albumThumbnailAssetId: a.albumThumbnailAssetId, updatedAt: a.updatedAt })));
  } catch (err) { logErr('Albums list failed: ' + err.message); res.status(502).json({ error: err.message }); }
});

app.get('/api/albums/:id', async (req, res) => {
  try { log('Fetching album ' + req.params.id); const r = await fetch(`${IMMICH_URL}/api/albums/${req.params.id}`, { headers: immichHeaders() }); if (!r.ok) throw new Error(`Immich returned ${r.status}`); const album = await r.json(); const assets = filterAssets(album.assets || []).map(mapAsset); const vids = assets.filter(a => a.type === 'VIDEO').length; log('Album "' + album.albumName + '" returned ' + assets.length + ' assets (' + (assets.length - vids) + ' photos, ' + vids + ' videos)'); res.json({ id: album.id, albumName: album.albumName, assetCount: assets.length, assets });
  } catch (err) { logErr('Album fetch failed: ' + err.message); res.status(502).json({ error: err.message }); }
});

app.get('/api/people', async (_req, res) => {
  try { const r = await fetch(`${IMMICH_URL}/api/people`, { headers: immichHeaders() }); if (!r.ok) throw new Error(`Immich returned ${r.status}`); const data = await r.json(); const people = (data.people || data || []).map(p => ({ id: p.id, name: p.name, thumbnailPath: p.thumbnailPath })); log('Listed ' + people.length + ' people'); res.json(people);
  } catch (err) { logErr('People list failed: ' + err.message); res.status(502).json({ error: err.message }); }
});

app.get('/api/people/:id', async (req, res) => {
  try { log('Fetching person ' + req.params.id); const r = await fetch(`${IMMICH_URL}/api/people/${req.params.id}/assets`, { headers: immichHeaders() }); if (!r.ok) throw new Error(`Immich returned ${r.status}`); const raw = await r.json(); const assets = filterAssets(Array.isArray(raw) ? raw : []).map(mapAsset); log('Person returned ' + assets.length + ' assets'); res.json(assets);
  } catch (err) { logErr('Person fetch failed: ' + err.message); res.status(502).json({ error: err.message }); }
});

app.get('/api/people/:id/thumbnail', async (req, res) => {
  try { const r = await fetch(`${IMMICH_URL}/api/people/${req.params.id}/thumbnail`, { headers: { 'x-api-key': API_KEY } }); if (!r.ok) throw new Error(`Immich returned ${r.status}`); res.set('Content-Type', r.headers.get('content-type') || 'image/jpeg'); res.set('Cache-Control', 'public, max-age=86400'); r.body.pipe(res);
  } catch (err) { res.status(502).json({ error: err.message }); }
});

app.get('/api/assets/random', async (req, res) => {
  try { const count = Math.min(parseInt(req.query.count, 10) || 50, 250); const r = await fetch(`${IMMICH_URL}/api/assets/random?count=${count}`, { headers: immichHeaders() }); if (!r.ok) throw new Error(`Immich returned ${r.status}`); const assets = filterAssets(await r.json()).map(mapAsset); log('Random returned ' + assets.length + ' assets'); res.json(assets);
  } catch (err) { logErr('Random fetch failed: ' + err.message); res.status(502).json({ error: err.message }); }
});

app.get('/api/assets/favorites', async (_req, res) => {
  try { const r = await fetch(`${IMMICH_URL}/api/search/metadata`, { method: 'POST', headers: immichHeaders(), body: JSON.stringify({ isFavorite: true, size: 250, page: 1 }) }); if (!r.ok) throw new Error(`Immich returned ${r.status}`); const data = await r.json(); const assets = filterAssets(data.assets?.items || []).map(a => ({ ...mapAsset(a), isFavorite: true })); log('Favorites returned ' + assets.length + ' assets'); res.json(assets);
  } catch (err) { logErr('Favorites fetch failed: ' + err.message); res.status(502).json({ error: err.message }); }
});

app.get('/api/assets/:id/thumbnail', async (req, res) => {
  try { const size = req.query.size || 'preview'; const r = await fetch(`${IMMICH_URL}/api/assets/${req.params.id}/thumbnail?size=${size}`, { headers: { 'x-api-key': API_KEY } }); if (!r.ok) throw new Error(`Immich returned ${r.status}`); res.set('Content-Type', r.headers.get('content-type') || 'image/jpeg'); res.set('Cache-Control', 'public, max-age=86400'); r.body.pipe(res);
  } catch (err) { res.status(502).json({ error: err.message }); }
});

app.get('/api/assets/:id/video', async (req, res) => {
  try { log('Streaming video ' + req.params.id); const r = await fetch(`${IMMICH_URL}/api/assets/${req.params.id}/video/playback`, { headers: { 'x-api-key': API_KEY } }); if (!r.ok) throw new Error(`Immich returned ${r.status}`); res.set('Content-Type', r.headers.get('content-type') || 'video/mp4'); res.set('Cache-Control', 'public, max-age=86400'); const cl = r.headers.get('content-length'); if (cl) res.set('Content-Length', cl); r.body.pipe(res);
  } catch (err) { logErr('Video stream failed: ' + err.message); res.status(502).json({ error: err.message }); }
});

app.get('/api/assets/:id/original', async (req, res) => {
  try { const r = await fetch(`${IMMICH_URL}/api/assets/${req.params.id}/original`, { headers: { 'x-api-key': API_KEY } }); if (!r.ok) throw new Error(`Immich returned ${r.status}`); res.set('Content-Type', r.headers.get('content-type') || 'image/jpeg'); res.set('Cache-Control', 'public, max-age=86400'); r.body.pipe(res);
  } catch (err) { res.status(502).json({ error: err.message }); }
});

app.get('*', (_req, res) => { res.sendFile(path.join(__dirname, 'public', 'index.html')); });

app.listen(PORT, '0.0.0.0', () => {
  log('--- Frambe v' + VERSION + ' ---');
  log('Server listening on port ' + PORT);
  log('Immich URL: ' + IMMICH_URL);
  log('API key: ' + (API_KEY ? 'configured (' + API_KEY.substring(0, 8) + '...)' : 'NOT SET'));
  log('Slideshow: ' + SLIDESHOW_INTERVAL + 's interval, ' + TRANSITION_DURATION + 's transition, refresh every ' + REFRESH_INTERVAL + 's');
  log('Videos: ' + (INCLUDE_VIDEOS ? 'enabled' : 'disabled'));
  if (ALBUM_ID) log('Default album: ' + ALBUM_ID);
  if (SHOW_FAVORITES_ONLY) log('Auto-start: favorites only');
  log('Waiting for requests...');
});