const express = require('express');
const router = express.Router();
const { db } = require('../db');
const { v4: uuidv4 } = require('uuid');

function requireAuth(req, res, next) {
  if (req.session && req.session.authenticated) {
    return next();
  }
  res.redirect('/admin/login');
}

router.get('/login', (req, res) => {
  if (req.session && req.session.authenticated) {
    return res.redirect('/admin');
  }
  res.render('admin/login', { error: null });
});

router.post('/login', (req, res) => {
  const { username, password } = req.body;
  const adminUser = process.env.ADMIN_USERNAME || 'admin';
  const adminPass = process.env.ADMIN_PASSWORD || 'changeme123';

  if (username === adminUser && password === adminPass) {
    console.log("[DEBUG] Connexion OK")
    req.session.authenticated = true;
    req.session.username = username;
    return req.session.save((err) => {
      if (err) {
        console.error('Session save error:', err);
      }
      return res.redirect('/admin');
    });
  }
  
  res.render('admin/login', { error: 'Identifiants incorrects' });
});

router.get('/logout', (req, res) => {
  req.session.destroy(() => {
    res.redirect('/admin/login');
  });
});

router.use(requireAuth);

router.get('/', (req, res) => {
  const status = req.query.status || 'all';
  const language = req.query.language || 'all';

  // Filtre langue identique au site public (repli sur la langue de la source)
  const languageExpr = `COALESCE(language, source_language, 'fr')`;

  const conditions = [];
  const params = [];

  if (status !== 'all') {
    conditions.push(`status = ?`);
    params.push(status);
  }

  if (language !== 'all') {
    conditions.push(`${languageExpr} = ?`);
    params.push(language);
  }

  const where = conditions.length > 0 ? ` WHERE ${conditions.join(' AND ')}` : '';
  const articles = db
    .prepare(`SELECT * FROM articles${where} ORDER BY datetime(created_at) DESC`)
    .all(...params);

  // Stats (filtrées sur la langue sélectionnée)
  const stats = {};
  ['pending', 'published', 'hidden', 'rejected'].forEach(s => {
    const statParams = [s];
    let statQuery = `SELECT COUNT(*) as c FROM articles WHERE status = ?`;
    if (language !== 'all') {
      statQuery += ` AND ${languageExpr} = ?`;
      statParams.push(language);
    }
    stats[s] = db.prepare(statQuery).get(...statParams).c;
  });

  let totalQuery = `SELECT COUNT(*) as c FROM articles`;
  const totalParams = [];
  if (language !== 'all') {
    totalQuery += ` WHERE ${languageExpr} = ?`;
    totalParams.push(language);
  }
  stats.total = db.prepare(totalQuery).get(...totalParams).c;

  // Langues disponibles dans l'ensemble des articles
  const languages = db
    .prepare(`SELECT ${languageExpr} as lang, COUNT(*) as c FROM articles GROUP BY lang ORDER BY c DESC, lang`)
    .all();

  res.render('admin/dashboard', { articles, status, stats, languages, language });
});

router.post('/article/:id/validate', (req, res) => {
  const { id } = req.params;
  const { categories, summary } = req.body;
  
  try {
    const categoriesJson = categories ? JSON.stringify(categories.split(',').map(c => c.trim()).filter(Boolean)) : null;
    
    db.prepare(`UPDATE articles SET status='published', categories=COALESCE(?, categories), summary=COALESCE(?, summary), updated_at=datetime('now') WHERE id=?`)
      .run(categoriesJson, summary || null, id);
    
    db.prepare(`INSERT INTO activity_log (action, article_id, details) VALUES ('validate', ?, 'Article publié')`).run(id);
    
    res.redirect(req.get('referer') || '/admin');
  } catch(e) {
    console.error(e);
    res.redirect('/admin');
  }
});

router.post('/article/:id/hide', (req, res) => {
  const { id } = req.params;
  db.prepare(`UPDATE articles SET status='hidden', updated_at=datetime('now') WHERE id=?`).run(id);
  db.prepare(`INSERT INTO activity_log (action, article_id, details) VALUES ('hide', ?, 'Article masqué')`).run(id);
  res.redirect(req.get('referer') || '/admin');
});

router.post('/article/:id/reject', (req, res) => {
  const { id } = req.params;
  db.prepare(`UPDATE articles SET status='rejected', updated_at=datetime('now') WHERE id=?`).run(id);
  db.prepare(`INSERT INTO activity_log (action, article_id, details) VALUES ('reject', ?, 'Article rejeté')`).run(id);
  res.redirect(req.get('referer') || '/admin');
});

router.post('/article/:id/publish', (req, res) => {
  const { id } = req.params;
  db.prepare(`UPDATE articles SET status='published', updated_at=datetime('now') WHERE id=?`).run(id);
  db.prepare(`INSERT INTO activity_log (action, article_id, details) VALUES ('publish', ?, 'Article republié')`).run(id);
  res.redirect(req.get('referer') || '/admin');
});

router.post('/article/:id/delete', (req, res) => {
  const { id } = req.params;
  db.prepare(`DELETE FROM articles WHERE id=?`).run(id);
  db.prepare(`INSERT INTO activity_log (action, article_id, details) VALUES ('delete', ?, 'Article supprimé')`).run(id);
  res.redirect(req.get('referer') || '/admin');
});

router.post('/collect', (req, res) => {
  const { collect } = require('../../collector/index');
  collect().then(() => {
    db.prepare(`INSERT INTO activity_log (action, details) VALUES ('collect', 'Collecte manuelle déclenchée')`).run();
    res.redirect('/admin?status=pending');
  }).catch(err => {
    console.error(err);
    res.redirect('/admin');
  });
});

router.get('/sources', (req, res) => {
  const sourcesPath = require('path').join(__dirname, '..', '..', 'config', 'sources.json');
  const sources = JSON.parse(require('fs').readFileSync(sourcesPath, 'utf8'));
  res.render('admin/sources', { sources });
});

router.get('/log', (req, res) => {
  const logs = db.prepare(`SELECT * FROM activity_log ORDER BY datetime(created_at) DESC LIMIT 100`).all();
  res.render('admin/log', { logs });
});

module.exports = router;