const express = require('express');
const router = express.Router();
const { authenticate } = require('../middleware/auth');
const { searchLimiter } = require('../middleware/rateLimiter');
const Post = require('../models/Post');

// Поиск постов по тексту и хэштегам
router.get('/', authenticate, searchLimiter, async (req, res) => {
  try {
    const { query, hashtag, page = 1, limit = 20 } = req.query;
    
    let searchQuery = {};
    
    // Применить whitelist настройки пользователя
    if (req.user.settings.whitelist.noFurry) {
      searchQuery.tags = { $ne: 'furry' };
    }
    if (req.user.settings.whitelist.onlyAnime) {
      searchQuery.tags = 'anime';
    }
    if (req.user.settings.whitelist.noNSFW) {
      searchQuery.isNSFW = false;
    }
    if (req.user.settings.whitelist.noHomo) {
      searchQuery.isHomo = { $ne: true };
    }
    
    // Поиск по хэштегу
    if (hashtag) {
      searchQuery.hashtags = hashtag.toLowerCase();
    }
    // Полнотекстовый поиск
    else if (query) {
      searchQuery.$text = { $search: query };
    } else {
      return res.status(400).json({ error: 'Параметр query или hashtag обязателен' });
    }
    
    const posts = await Post.find(searchQuery)
      .populate('author', 'username firstName lastName photoUrl')
      .populate('mentionedUsers', 'username firstName lastName')
      .populate('comments.author', 'username firstName lastName photoUrl')
      .sort(query ? { score: { $meta: 'textScore' } } : { createdAt: -1 })
      .limit(limit * 1)
      .skip((page - 1) * limit)
      .exec();
    
    const count = await Post.countDocuments(searchQuery);
    
    res.json({
      posts,
      totalPages: Math.ceil(count / limit),
      currentPage: page
    });
  } catch (error) {
    console.error('Ошибка поиска постов:', error);
    res.status(500).json({ error: 'Ошибка сервера' });
  }
});

// Получить популярные хэштеги
router.get('/trending-hashtags', authenticate, async (req, res) => {
  try {
    const { limit = 20 } = req.query;
    
    const hashtags = await Post.aggregate([
      { $unwind: '$hashtags' },
      { $group: { _id: '$hashtags', count: { $sum: 1 } } },
      { $sort: { count: -1 } },
      { $limit: parseInt(limit) }
    ]);
    
    res.json({
      hashtags: hashtags.map(h => ({
        tag: h._id,
        count: h.count
      }))
    });
  } catch (error) {
    console.error('Ошибка получения трендовых хэштегов:', error);
    res.status(500).json({ error: 'Ошибка сервера' });
  }
});

// Получить посты по хэштегу
router.get('/hashtag/:tag', authenticate, async (req, res) => {
  try {
    const { page = 1, limit = 20 } = req.query;
    const hashtag = req.params.tag.toLowerCase();
    
    const query = { hashtags: hashtag };
    
    // Применить whitelist настройки пользователя
    if (req.user.settings.whitelist.noFurry) {
      query.tags = { $ne: 'furry' };
    }
    if (req.user.settings.whitelist.onlyAnime) {
      query.tags = 'anime';
    }
    if (req.user.settings.whitelist.noNSFW) {
      query.isNSFW = false;
    }
    if (req.user.settings.whitelist.noHomo) {
      query.isHomo = { $ne: true };
    }
    
    const posts = await Post.find(query)
      .populate('author', 'username firstName lastName photoUrl')
      .populate('mentionedUsers', 'username firstName lastName')
      .populate('comments.author', 'username firstName lastName photoUrl')
      .sort({ createdAt: -1 })
      .limit(limit * 1)
      .skip((page - 1) * limit)
      .exec();
    
    const count = await Post.countDocuments(query);
    
    res.json({
      hashtag,
      posts,
      totalPages: Math.ceil(count / limit),
      currentPage: page
    });
  } catch (error) {
    console.error('Ошибка получения постов по хэштегу:', error);
    res.status(500).json({ error: 'Ошибка сервера' });
  }
});

module.exports = router;