const db = require('../surreal');
const router = require('express').Router();
const {auth} = require('../auth/middleware');

router.get('/:id', async (req, res) => {
    try{
        const id = 'posts:' + req.params.id;

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

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

        if(post.length == 0) return res.status(400).json({error: "Post does not exist"});
        else {
            const viewPost = await db.query(`UPDATE posts SET viewcount += 1 WHERE id = "${postId}"`);
        }

        res.status(200).json({post});
    }
    catch(err){
        console.log(err);
        res.status(500).json({error: "Internal server error"});
    }
});

router.post('/like/:postId',auth, 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"});
});

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

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

    const Comment = {
        author: username,
        comment: comment
    }

    const commentDB = await db.create('comments', Comment);

    const post = await db.query(`UPDATE posts SET comments += "${commentDB[0].id}" WHERE id = "${postId}"`);
    const user = await db.query(`UPDATE users SET comments += "${commentDB[0].id}" WHERE username = string::lowercase("${username}")`);

    res.status(200).json({message: "Comment added"});
});

router.post('/comment/:postId/:commentId',auth, async (req, res) => {
    const username = req.user;
    const postId = 'posts:' + req.params.postId;
    const commentId = 'comments:' + req.params.commentId;
    const comment = req.body.comment;

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

    const Comment = {
        author: username,
        comment: comment,
        parent: commentId
    }

    const commentDB = await db.create('comments', Comment);

    const post = await db.query(`UPDATE posts SET comments += "${commentDB[0].id}" WHERE id = "${postId}"`);
    const user = await db.query(`UPDATE users SET comments += "${commentDB[0].id}" WHERE username = string::lowercase("${username}")`);

    res.status(200).json({message: "Comment added"});
});

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

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

    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"});
});

router.post('/save/:postId',auth, 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 saved post
    for(let i = 0; i < postData[0].saves.length; i++){
        if(postData[0].saves[i] === username){
            const post = await db.query(`UPDATE posts SET saves -= "${username}" WHERE id = "${postId}"`);
            const user = await db.query(`UPDATE users SET savedPosts -= "${req.params.postId}" WHERE username = string::lowercase("${username}")`);

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

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

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

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

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

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

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

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

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

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

module.exports = router;