const User = require('../models/User');

exports.searchUsers = async (req, res) => {
  try {
    const { username, email } = req.query;
    
    if (!username && !email) {
      return res.status(400).json({ error: 'Username or email is required for search' });
    }

    const searchQuery = {};
    if (username) {
      searchQuery.username = { $regex: username, $options: 'i' };
    }
    if (email) {
      searchQuery.email = { $regex: email, $options: 'i' };
    }

    // Exclude current user from results
    searchQuery._id = { $ne: req.user.userId };

    const users = await User.find(searchQuery)
      .select('username displayName avatar status lastSeen bio')
      .limit(20);

    res.json({ users });
  } catch (error) {
    console.error('User search error:', error);
    res.status(500).json({ error: 'Server error during user search' });
  }
};

exports.getUserProfile = async (req, res) => {
  try {
    const { userId } = req.params;

    const user = await User.findById(userId)
      .select('username displayName avatar status lastSeen bio createdAt');

    if (!user) {
      return res.status(404).json({ error: 'User not found' });
    }

    res.json({ user });
  } catch (error) {
    console.error('Get user profile error:', error);
    res.status(500).json({ error: 'Server error' });
  }
};

exports.updateSettings = async (req, res) => {
  try {
    const { theme, notifications } = req.body;

    const updateData = {};
    if (theme) updateData['settings.theme'] = theme;
    if (notifications) {
      if (typeof notifications.enabled !== 'undefined') {
        updateData['settings.notifications.enabled'] = notifications.enabled;
      }
      if (typeof notifications.sound !== 'undefined') {
        updateData['settings.notifications.sound'] = notifications.sound;
      }
      if (typeof notifications.preview !== 'undefined') {
        updateData['settings.notifications.preview'] = notifications.preview;
      }
    }

    const user = await User.findByIdAndUpdate(
      req.user.userId,
      { $set: updateData },
      { new: true, runValidators: true }
    );

    res.json({
      message: 'Settings updated successfully',
      settings: user.settings
    });
  } catch (error) {
    console.error('Update settings error:', error);
    res.status(500).json({ error: 'Server error during settings update' });
  }
};

exports.deleteAccount = async (req, res) => {
  try {
    const { confirmation } = req.body;
    
    if (confirmation !== 'DELETE MY ACCOUNT') {
      return res.status(400).json({ 
        error: 'Please type "DELETE MY ACCOUNT" to confirm account deletion' 
      });
    }

    await User.findByIdAndDelete(req.user.userId);
    
    res.clearCookie('token');
    res.json({ message: 'Account deleted successfully' });
  } catch (error) {
    console.error('Delete account error:', error);
    res.status(500).json({ error: 'Server error during account deletion' });
  }
};