import {body, param} from "express-validator";
import {getClient} from "../utils/database.js";
import jwt from "jsonwebtoken";


export const Playlist = {
    id: param("id").notEmpty().isNumeric().trim(),
    name: body("name").notEmpty().trim(),
    owner: body("owner").notEmpty().isNumeric().trim(),
    videoId: param("videoId").notEmpty().isNumeric().trim(),
}

export async function doPlaylistExists(req, res, next) {

    const id = req.params.id;
    const logger = req.body.logger;

    const client = await getClient();
    try {
        const query = `SELECT id FROM playlists WHERE id = $1`;
        const result = await client.query(query, [id]);
        
        if (result.rows.length === 0) {
            logger.write("No playlist with id " + id, 404);
            res.status(404).json({error: "Playlist not found"});
            return;
        }
        next();
    } catch (error) {
        logger.write("Error checking playlist existence: " + error.message, 500);
        res.status(500).json({error: error});
        return;
    } finally {
        client.release();
    }
}

export async function isOwner(req, res, next) {

    const id = req.params.id;
    const token = req.headers.authorization.split(' ')[1];
    const userId = jwt.decode(token)["id"];

    const logger = req.body.logger;

    const client = await getClient();
    try {
        const query = `SELECT owner FROM playlists WHERE id = $1`;
        const result = await client.query(query, [id]);

        if(result.rows[0].owner !== userId) {
            logger.write("user not the owner of the playlist with id " + id, 403);
            res.status(403).json({error: "You do not have permission"});
            return;
        }

        next();
    } finally {
        client.release();
    }
}

export async function isVideoInPlaylist(req, res, next) {

    const id = req.params.id;
    const videoId = req.params.videoId;
    const logger = req.body.logger;
    const client = await getClient();
    
    try {
        const query = `SELECT id FROM playlist_elements WHERE video = $1 AND playlist = $2`;
        const result = await client.query(query, [videoId, id]);

        if(result.rows.length === 0) {
            logger.write("video " + videoId + "not found in playlist with id " + id, 404 );
            res.status(404).json({error: "Video " + videoId + "not found"});
            return;
        }

        next();
    } catch (error) {
        logger.write("Error checking video in playlist: " + error.message, 500);
        res.status(500).json({error: error });
        return;
    } finally {
        client.release();
    }
}