const express = require('express');
const fs = require('fs-extra');
const path = require('path');

const router = express.Router();
const SERVER_DIR = process.env.SERVER_DIR || '/mc-server';

function isAuthenticated(req, res, next) {
  if (req.session.user) {
    next();
  } else {
    res.status(401).json({ error: 'Non authentifié' });
  }
}

router.get('/', isAuthenticated, async (req, res) => {
  try {
    const { lines = 100 } = req.query;
    const logsDir = SERVER_DIR;
    
    let logFile = path.join(logsDir, 'latest.log');
    
    if (!await fs.pathExists(logFile)) {
      logFile = path.join(logsDir, 'ForgeModLoader-server-0.log');
    }

    if (!await fs.pathExists(logFile)) {
      return res.json({ logs: [], message: 'Aucun fichier log trouvé' });
    }

    const content = await fs.readFile(logFile, 'utf-8');
    const logLines = content.split('\n');
    const lastLines = logLines.slice(-parseInt(lines));

    res.json({ 
      logs: lastLines,
      file: path.basename(logFile),
      totalLines: logLines.length
    });

  } catch (error) {
    console.error('Erreur logs:', error);
    res.status(500).json({ error: 'Erreur serveur' });
  }
});

router.get('/files', isAuthenticated, async (req, res) => {
  try {
    const logsDir = SERVER_DIR;
    const files = await fs.readdir(logsDir);
    
    const logFiles = files.filter(f => 
      f.includes('log') || f.includes('Log')
    );

    const filesWithStats = await Promise.all(
      logFiles.map(async (f) => {
        const stats = await fs.stat(path.join(logsDir, f));
        return {
          name: f,
          size: (stats.size / 1024).toFixed(2) + ' KB',
          modified: stats.mtime
        };
      })
    );

    res.json(filesWithStats.sort((a, b) => new Date(b.modified) - new Date(a.modified)));

  } catch (error) {
    console.error('Erreur liste logs:', error);
    res.status(500).json({ error: 'Erreur serveur' });
  }
});

router.get('/file/:filename', isAuthenticated, async (req, res) => {
  try {
    const { filename } = req.params;
    const { lines = 100 } = req.query;
    
    if (filename.includes('..')) {
      return res.status(400).json({ error: 'Accès non autorisé' });
    }

    const filePath = path.join(SERVER_DIR, filename);

    if (!await fs.pathExists(filePath)) {
      return res.status(404).json({ error: 'Fichier non trouvé' });
    }

    const content = await fs.readFile(filePath, 'utf-8');
    const fileLines = content.split('\n');
    const lastLines = fileLines.slice(-parseInt(lines));

    res.json({ 
      logs: lastLines,
      file: filename,
      totalLines: fileLines.length
    });

  } catch (error) {
    console.error('Erreur lecture log:', error);
    res.status(500).json({ error: 'Erreur serveur' });
  }
});

router.get('/search', isAuthenticated, async (req, res) => {
  try {
    const { query } = req.query;
    
    if (!query || query.length < 2) {
      return res.status(400).json({ error: 'Requête trop courte' });
    }

    let logFile = path.join(SERVER_DIR, 'latest.log');
    if (!await fs.pathExists(logFile)) {
      logFile = path.join(SERVER_DIR, 'ForgeModLoader-server-0.log');
    }

    if (!await fs.pathExists(logFile)) {
      return res.json({ results: [] });
    }

    const content = await fs.readFile(logFile, 'utf-8');
    const lines = content.split('\n');
    const results = lines
      .map((line, index) => ({ line, index }))
      .filter(({ line }) => line.toLowerCase().includes(query.toLowerCase()))
      .slice(-50);

    res.json({ results });

  } catch (error) {
    console.error('Erreur recherche:', error);
    res.status(500).json({ error: 'Erreur serveur' });
  }
});

module.exports = router;