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

const ALLOWED_SEARCH_PREFERENCES = ['furry', 'anime'];

// Получить профиль пользователя
router.get('/:id', authenticate, async (req, res) => {
  try {
    const user = await User.findById(req.params.id)
      .select('-__v')
      .populate('followers', 'username firstName lastName photoUrl')
      .populate('following', 'username firstName lastName photoUrl');
    
    if (!user) {
      return res.status(404).json({ error: 'Пользователь не найден' });
    }
    
    // Проверить подписку текущего пользователя
    const isFollowing = user.followers.some(f => f._id.equals(req.user._id));
    
    res.json({
      user: {
        id: user._id,
        username: user.username,
        firstName: user.firstName,
        lastName: user.lastName,
        photoUrl: user.photoUrl,
        bio: user.bio,
        followersCount: user.followers.length,
        followingCount: user.following.length,
        isFollowing,
        createdAt: user.createdAt
      }
    });
  } catch (error) {
    console.error('Ошибка получения профиля:', error);
    res.status(500).json({ error: 'Ошибка сервера' });
  }
});

// Получить посты пользователя
router.get('/:id/posts', authenticate, async (req, res) => {
  try {
    const { page = 1, limit = 20 } = req.query;
    
    const posts = await Post.find({ author: req.params.id })
      .populate('author', 'username firstName lastName photoUrl')
      .sort({ createdAt: -1 })
      .limit(limit * 1)
      .skip((page - 1) * limit)
      .exec();
    
    const count = await Post.countDocuments({ author: req.params.id });
    
    res.json({
      posts,
      totalPages: Math.ceil(count / limit),
      currentPage: page
    });
  } catch (error) {
    console.error('Ошибка получения постов:', error);
    res.status(500).json({ error: 'Ошибка сервера' });
  }
});

// Подписаться / отписаться
router.post('/:id/follow', authenticate, async (req, res) => {
  try {
    if (req.params.id === req.user._id.toString()) {
      return res.status(400).json({ error: 'Нельзя подписаться на себя' });
    }
    
    const targetUser = await User.findById(req.params.id);
    
    if (!targetUser) {
      return res.status(404).json({ error: 'Пользователь не найден' });
    }
    
    const isFollowing = targetUser.followers.includes(req.user._id);
    
    if (isFollowing) {
      // Отписаться
      targetUser.followers = targetUser.followers.filter(id => !id.equals(req.user._id));
      req.user.following = req.user.following.filter(id => !id.equals(targetUser._id));
    } else {
      // Подписаться
      targetUser.followers.push(req.user._id);
      req.user.following.push(targetUser._id);
      
      // Создать уведомление
      const notification = new Notification({
        recipient: targetUser._id,
        sender: req.user._id,
        type: 'follow'
      });
      await notification.save();
    }
    
    await targetUser.save();
    await req.user.save();
    
    res.json({ 
      following: !isFollowing,
      followersCount: targetUser.followers.length
    });
  } catch (error) {
    console.error('Ошибка подписки:', error);
    res.status(500).json({ error: 'Ошибка сервера' });
  }
});

// Обновить профиль
router.put('/profile', authenticate, async (req, res) => {
  try {
    const { bio, settings } = req.body;
    
    if (bio !== undefined) {
      req.user.bio = bio;
    }
    
    if (settings) {
      req.user.settings = req.user.settings || {};

      if (settings.whitelist) {
        const currentWhitelist =
          req.user.settings.whitelist && typeof req.user.settings.whitelist.toObject === 'function'
            ? req.user.settings.whitelist.toObject()
            : { ...(req.user.settings.whitelist || {}) };

        req.user.settings.whitelist = {
          ...currentWhitelist,
          ...settings.whitelist
        };
      }

      if (settings.searchPreference) {
        req.user.settings.searchPreference = ALLOWED_SEARCH_PREFERENCES.includes(settings.searchPreference)
          ? settings.searchPreference
          : 'furry';
      }

      if (!req.user.settings.searchPreference) {
        req.user.settings.searchPreference = 'furry';
      }

      if (!req.user.settings.whitelist) {
        req.user.settings.whitelist = { noNSFW: true };
      } else if (req.user.settings.whitelist.noNSFW === undefined) {
        req.user.settings.whitelist.noNSFW = true;
      }

      req.user.markModified('settings');
    }
    
    await req.user.save();
    
    res.json({ 
      message: 'Профиль обновлен',
      user: req.user
    });
  } catch (error) {
    console.error('Ошибка обновления профиля:', error);
    res.status(500).json({ error: 'Ошибка сервера' });
  }
});

// Поиск пользователей
router.get('/search/:query', authenticate, async (req, res) => {
  try {
    const users = await User.find({
      $or: [
        { username: { $regex: req.params.query, $options: 'i' } },
        { firstName: { $regex: req.params.query, $options: 'i' } },
        { lastName: { $regex: req.params.query, $options: 'i' } }
      ]
    })
    .select('username firstName lastName photoUrl')
    .limit(10);
    
    res.json({ users });
  } catch (error) {
    console.error('Ошибка поиска пользователей:', error);
    res.status(500).json({ error: 'Ошибка сервера' });
  }
});

module.exports = router;