const db = require('../surreal');
const router = require('express').Router();

router.post('/like/:postId', async (req, res) => {
    const username = req.user;
    const postId = 'posts:' + req.params.postId;

    if(!username) return res.status(400).json({error: "Missing username"});
    if(!postId) return res.status(400).json({error: "Missing postId"});

    const postData = await db.query(`SELECT * FROM posts WHERE id = "${postId}"`);

    //check if user already liked post
    for(let i = 0; i < postData[0].likes.length; i++){
        if(postData[0].likes[i] === username){
            const post = await db.query(`UPDATE posts SET likes -= "${username}" WHERE id = "${postId}"`);
            const user = await db.query(`UPDATE users SET likedPosts -= "${req.params.postId}" WHERE username = string::lowercase("${username}")`);

            return res.status(200).json({message: "Post unliked"});
        }
    }

    const post = await db.query(`UPDATE posts SET likes += "${username}" WHERE id = "${postId}"`);
    const user = await db.query(`UPDATE users SET likedPosts += "${req.params.postId}" WHERE username = string::lowercase("${username}")`);

    res.status(200).json({message: "Post liked"});
});

module.exports = router;