const express = require("express");
const Post = require("../models/Post");
const auth = require("../middleware/auth");

const router = express.Router();

// Get all posts
router.get("/", async (req, res) => {
  try {
    const posts = await Post.find().populate("user", ["name"]);
    res.json(posts);
  } catch (err) {
    console.error(err.message);
    res.status(500).send("Server error");
  }
});

// Create a post
router.post("/", auth, async (req, res) => {
  const { content, imageUrl } = req.body;

  try {
    const newPost = new Post({
      user: req.user.id,
      content,
      imageUrl,
    });

    const post = await newPost.save();
    res.json(post);
  } catch (err) {
    console.error(err.message);
    res.status(500).send("Server error");
  }
});

// Like a post
router.put("/like/: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 if the post has already been liked by this user
    if (
      post.likes.filter((like) => like.toString() === req.user.id).length > 0
    ) {
      return res.status(400).json({ msg: "Post already liked" });
    }

    post.likes.unshift(req.user.id);

    await post.save();

    res.json(post.likes);
  } catch (err) {
    console.error(err.message);
    res.status(500).send("Server error");
  }
});

module.exports = router;