const express = require('express');
const router = express.Router();
const { db } = require('../database/db');
const { authenticate, requireAdmin } = require('../middleware/auth');
const { readLimiter } = require('../middleware/rateLimiter');
const { sanitizeString } = require('../utils/inputValidator');
const logger = require('../utils/logger');

/**
 * Global search endpoint
 * Searches across channels, radio stations, users, settings, etc.
 */
router.get('/', authenticate, readLimiter, async (req, res) => {
  try {
    const { q } = req.query;
    const isAdmin = req.user.role === 'admin';

    if (!q || q.trim().length < 2) {
      return res.json({
        channels: [],
        radio: [],
        users: [],
        settings: [],
        groups: []
      });
    }

    // Validate and sanitize search query
    const sanitized = sanitizeString(q.trim());
    if (sanitized.length > 100) {
      return res.status(400).json({ error: 'Search query too long' });
    }

    const searchTerm = `%${sanitized}%`;
    const results = {
      channels: [],
      radio: [],
      users: [],
      settings: [],
      groups: []
    };

    // Search TV channels (only from user's playlists)
    results.channels = await new Promise((resolve, reject) => {
      db.all(
        `SELECT DISTINCT c.id, c.name, c.url, COALESCE(c.custom_logo, c.logo) as logo, c.group_name, c.is_radio
         FROM channels c
         JOIN playlists p ON c.playlist_id = p.id
         WHERE p.user_id = ? AND c.is_radio = 0 AND c.is_active = 1
         AND (c.name LIKE ? OR c.group_name LIKE ?)
         ORDER BY c.name
         LIMIT 20`,
        [req.user.userId, searchTerm, searchTerm],
        (err, rows) => {
          if (err) reject(err);
          else resolve(rows || []);
        }
      );
    });

    // Search Radio channels (only from user's playlists)
    results.radio = await new Promise((resolve, reject) => {
      db.all(
        `SELECT DISTINCT c.id, c.name, c.url, COALESCE(c.custom_logo, c.logo) as logo, c.group_name, c.is_radio
         FROM channels c
         JOIN playlists p ON c.playlist_id = p.id
         WHERE p.user_id = ? AND c.is_radio = 1 AND c.is_active = 1
         AND (c.name LIKE ? OR c.group_name LIKE ?)
         ORDER BY c.name
         LIMIT 20`,
        [req.user.userId, searchTerm, searchTerm],
        (err, rows) => {
          if (err) reject(err);
          else resolve(rows || []);
        }
      );
    });

    // Search groups (only from user's playlists)
    results.groups = await new Promise((resolve, reject) => {
      db.all(
        `SELECT DISTINCT c.group_name as name, c.is_radio
         FROM channels c
         JOIN playlists p ON c.playlist_id = p.id
         WHERE p.user_id = ? AND c.is_active = 1
         AND c.group_name LIKE ?
         ORDER BY c.group_name
         LIMIT 10`,
        [req.user.userId, searchTerm],
        (err, rows) => {
          if (err) reject(err);
          else resolve(rows || []);
        }
      );
    });

    // Search users (admin only)
    if (isAdmin) {
      results.users = await new Promise((resolve, reject) => {
        db.all(
          `SELECT id, username, email, role, created_at
           FROM users
           WHERE username LIKE ? OR email LIKE ?
           ORDER BY username
           LIMIT 10`,
          [searchTerm, searchTerm],
          (err, rows) => {
            if (err) reject(err);
            else resolve(rows || []);
          }
        );
      });
    }

    // Add settings/pages results (static)
    const settingsOptions = [
      { id: 'settings', name: 'Settings', path: '/settings', icon: 'settings' },
      { id: 'user-management', name: 'User Management', path: '/settings?tab=users', icon: 'people' },
      { id: 'vpn-settings', name: 'VPN Settings', path: '/settings?tab=vpn', icon: 'vpn_lock' },
      { id: '2fa', name: 'Two-Factor Authentication', path: '/settings?tab=2fa', icon: 'security' },
      { id: 'live-tv', name: 'Live TV', path: '/live', icon: 'tv' },
      { id: 'radio', name: 'Radio', path: '/radio', icon: 'radio' },
      { id: 'movies', name: 'Movies', path: '/movies', icon: 'movie' },
      { id: 'series', name: 'Series', path: '/series', icon: 'subscriptions' },
      { id: 'favorites', name: 'Favorites', path: '/favorites', icon: 'favorite' },
    ];

    results.settings = settingsOptions.filter(option =>
      option.name.toLowerCase().includes(q.toLowerCase())
    );

    res.json(results);
  } catch (error) {
    console.error('Search error:', error);
    res.status(500).json({ error: 'Search failed' });
  }
});

module.exports = router;