text: const express = require('express');
  const router = express.Router();
  
  const { check, validationResult } = require('express-validator');
  const auth = require('../../middileware/auth');
  const Post = require('../../models/Post');
  const User = require('../../models/User');
  
  // @route    POST api/posts
  // @desc     Create a post
  // @access   Private
  router.post(
      '/',
      [auth, [check('text', 'Text is required').not().isEmpty()]],
      async (req, res) => {
          const errors = validationResult(req);
          if (!errors.isEmpty()) {
              return res.status(400).json({ errors: errors.array() });
          }
  
          try {
              const user = await User.findById(req.user.id).select('-password');
  
              const newPost = Post({
                  text: req.body.text,
                  name: user.name,
                  avatar: user.avatar,
                  user: req.user.id,
              });
  
              await newPost.save();
  
              res.json(newPost);
          } catch (err) {
              console.error(err.message);
              res.status(500).send('Server Error');
          }
      }
  );
  
  // @route    GET api/posts
  // @desc     Get all post
  // @access   Private
  router.get('/', auth, async (req, res) => {
      try {
          const posts = await Post.find().sort({ date: -1 });
  
          res.json(posts);
      } catch (err) {
          console.error(err.message);
          res.status(500).send('Server Error');
      }
  });
  
  // @route    GET api/posts/:id
  // @desc     Get post by ID
  // @access   Private
  router.get('/:id', auth, async (req, res) => {
      try {
          const post = await Post.findById(req.params.id);
          if (!post) {
              return res.status(404).json({ msg: 'Post not found' });
          }
          res.json(post);
      } catch (err) {
          console.error(err.message);
          if (err.kind === 'ObjectId') {
              return res.status(404).json({ msg: 'Post not found' });
          }
          res.status(500).send('Server Error');
      }
  });
  
  // @route    DELETE api/posts/:id
  // @desc     Delete a post
  // @access   Private
  router.delete('/:id', auth, async (req, res) => {
      try {
          const post = await Post.findById(req.params.id);
  
          if (!post) {
              return res.status(404).json({ msg: 'Post not found' });
          }
  
          // check user identity
          if (post.user.toString() !== req.user.id) {
              return res.status(401).json({ msg: 'User not authorized' });
          }
  
          await post.remove();
  
          res.json({ msg: 'Post removed' });
      } catch (err) {
          console.error(err.message);
          if (err.kind === 'ObjectId') {
              return res.status(404).json({ msg: 'Post not found' });
          }
          res.status(500).send('Server Error');
      }
  });
  
  // @route    PUT api/posts/like/:id
  // @desc     Like a post
  // @access   Private
  router.put('/like/:id', auth, async (req, res) => {
      try {
          const post = await Post.findById(req.params.id);
  
          // Check if the post has already been liked
          if (
              post.likes.filter((like) => like.user.toString() === req.user.id)
                  .length > 0
          ) {
              return res.status(400).json({ msg: 'Post already liked' });
          }
  
          post.likes.unshift({ user: req.user.id });
  
          await post.save();
  
          res.json(post.likes);
      } catch (err) {
          console.error(err.message);
          res.status(500).send('Server Error');
      }
  });
  
  // @route    PUT api/posts/unlike/:id
  // @desc     Unlike a post
  // @access   Private
  router.put('/unlike/:id', auth, async (req, res) => {
      try {
          const post = await Post.findById(req.params.id);
  
          // Check if the post has already been liked
          if (
              post.likes.filter((like) => like.user.toString() === req.user.id)
                  .length === 0
          ) {
              return res.status(400).json({ msg: 'Post has not yet been liked' });
          }
  
          // Get remove index
          const removeIndex = post.likes
              .map((like) => like.user.toString())
              .indexOf(req.user.id);
  
          post.likes.splice(removeIndex, 1);
  
          await post.save();
  
          res.json(post.likes);
      } catch (err) {
          console.error(err.message);
          res.status(500).send('Server Error');
      }
  });
  
  // @route    POST api/posts/comment/:id
  // @desc     Comment on a post
  // @access   Private
  router.post(
      '/comment/:id',
      [auth, [check('text', 'Text is required').not().isEmpty()]],
      async (req, res) => {
          const errors = validationResult(req);
          if (!errors.isEmpty()) {
              return res.status(400).json({ errors: errors.array() });
          }
  
          try {
              const user = await User.findById(req.user.id).select('-password');
              const post = await Post.findById(req.params.id);
  
              const newComment = {
                  text: req.body.text,
                  name: user.name,
                  avatar: user.avatar,
                  user: req.user.id,
              };
  
              post.comments.unshift(newComment);
  
              await post.save();
  
              res.json(post.comments);
          } catch (err) {
              console.error(err.message);
              res.status(500).send('Server Error');
          }
      }
  );
  
  // @route    DELETE api/posts/comment/:id/:comment_id
  // @desc     Delete a comment
  // @access   Private
  router.delete('/comment/:id/:comment_id', auth, async (req, res) => {
      try {
          const post = await Post.findById(req.params.id);
  
          const comment = post.comments.find(
              (comment) => comment.id === req.params.comment_id
          );
  
          if (!comment) {
              return res.status(404).json({ msg: 'Comment not found' });
          }
  
          if (comment.user.toString() !== req.user.id) {
              return res.status(401).json({ msg: 'User not authorized' });
          }
  
          const removeIndex = post.comments
              .map((comment) => comment.user.toString())
              .indexOf(req.user.id);
  
          post.comments.splice(removeIndex, 1);
  
          await post.save();
  
          res.json(post.comments);
      } catch (err) {
          console.error(err.message);
          res.status(500).send('Server Error');
      }
  });
  
  module.exports = router;
  