const express = require('express');
const config = require('./src/config');
const { migrate } = require('./src/config/db');

// Routes
const generateRoutes = require('./src/routes/generate');
const channelsRoutes = require('./src/routes/channels');
const postsRoutes = require('./src/routes/posts');
const articlesRoutes = require('./src/routes/articles');
const statsRoutes = require('./src/routes/stats');
const notesRoutes = require('./src/routes/notes');
const seriesRoutes = require('./src/routes/series');
const categoriesRoutes = require('./src/routes/categories');
const autogenRoutes = require('./src/routes/autogen');
const userPostsRoutes = require('./src/routes/userPosts');
const settingsRoutes  = require('./src/routes/settings');
const photoSearchRoutes = require('./src/routes/photo-search');
const scheduledPostsRoutes = require('./src/routes/scheduledPosts');
const channelStatsRoutes = require('./src/routes/channelStats');
const calendarRoutes = require('./src/routes/calendar');
const metricsRoutes  = require('./src/routes/metrics');
const usageRoutes    = require('./src/routes/usage');

// Start queue worker
require('./src/workers/generation');
// Metrics collector
require('./src/services/metricsCollector').startAutoCollect();

const app = express();
app.use(express.json());

// Раздача загруженных файлов (обложки статей и т.п.)
const path = require('path');
const UPLOADS_DIR = process.env.UPLOADS_DIR || '/var/www/zeropost-uploads';
require('fs').mkdirSync(UPLOADS_DIR, { recursive: true });

// Public uploads — ДО auth-middleware, без секрета
app.use('/uploads', express.static(UPLOADS_DIR, { maxAge: '7d', immutable: true }));


// Публичные роуты (без auth)
app.get('/api/billing/plans', async (req, res) => {
  const { query: q } = require('./src/config/db');
  const { rows: plans } = await q('SELECT * FROM plans WHERE is_active=true ORDER BY sort_order');
  const { rows: costs } = await q('SELECT * FROM credit_costs ORDER BY operation');
  res.json({ plans, costs });
});

// ЮKassa webhook — публичный, без internal secret
app.post('/api/billing/webhook',
  express.json({ type: '*/*' }),
  require('./src/routes/billing').handle || ((req, res, next) => {
    require('./src/services/yukassa').handleWebhook(req.body)
      .then(r => res.json({ ok: true, ...r }))
      .catch(err => res.status(500).json({ error: err.message }));
  })
);

// TG webhook — публичный (TG не шлёт internal secret)
const inboxRoutes = require('./src/routes/inbox');
app.use('/api', inboxRoutes); // включает /api/tg-webhook/:channelId

// Simple internal auth middleware
app.use((req, res, next) => {
  const secret = req.headers['x-internal-secret'];
  if (secret !== config.internalSecret) {
    return res.status(401).json({ error: 'Unauthorized' });
  }
  next();
});

// AI usage context — приклеивает к каждому запросу service + user_id,
// чтобы сервисы (ai.js, covers.js, postImages.js, articleAutoSeries.js)
// логировали расход без явного проброса параметров.
const aiContext = require('./src/lib/aiContext');
app.use((req, res, next) => {
  let service = 'zeropost-other';
  // Блог-сторона zeropost.ru: статьи, серии, авто-публикация, темы.
  if (/^\/api\/(articles|autogen|series|notes|categories|stats|posts|scheduled-posts|generate)/.test(req.path)) {
    service = 'zeropost-blog';
  // SaaS-сторона app.zeropost.ru: пользовательские посты, каналы, календарь, аналитика.
  } else if (/^\/api\/(user-posts|calendar|channels|channel-stats|metrics|photo-search)/.test(req.path)) {
    service = 'zeropost-tool';
  }
  const userIdRaw = req.headers['x-user-id'];
  const userId = userIdRaw ? parseInt(userIdRaw, 10) || null : null;
  aiContext.run({ service, userId }, () => next());
});

app.use('/api/generate', generateRoutes);
app.use('/api/channels', channelsRoutes);
app.use('/api/posts', postsRoutes);
app.use('/api/articles', articlesRoutes);
app.use('/api/stats', statsRoutes);
app.use('/api/notes', notesRoutes);
app.use('/api/series', seriesRoutes);
app.use('/api/categories', categoriesRoutes);
app.use('/api/autogen', autogenRoutes);
app.use('/api/user-posts', userPostsRoutes);
app.use('/api/settings',   settingsRoutes);
app.use('/api/photo-search', photoSearchRoutes);
app.use('/api/scheduled-posts', scheduledPostsRoutes);
app.use('/api/channel-stats', channelStatsRoutes);
app.use('/api/calendar', calendarRoutes);
app.use('/api/metrics',  metricsRoutes);
app.use('/api/usage',    usageRoutes);
app.use('/api/billing', require('./src/routes/billing'));
app.use('/api/channels', require('./src/routes/polls'));
app.use('/api', inboxRoutes); // /inbox/:id, /inbox/:id/reply, /tg-webhook/:channelId

app.get('/health', (req, res) => {
  res.json({ ok: true, service: 'zeropost-engine', time: new Date() });
});

const start = async () => {
  await migrate();
  await config.reloadAi();
  console.log('[Engine] AI config loaded from app_settings: text=' + config.ai.baseUrl + ', images=routerai.ru (' + (config.ai.routeraiModel || 'gpt-5-image-mini') + ')');

  // Автоматический ретрай SVG-заглушек
  require('./src/services/coverRetry').start();

  app.listen(config.port, () => {
    console.log(`[Engine] Running on port ${config.port}`);
  });
};

start().catch(err => {
  console.error('[Engine] Failed to start:', err);
  process.exit(1);
});