import {getClient} from "../utils/database.js";
import * as path from "node:path";
import * as fs from "node:fs";
import { fileURLToPath } from 'url';
import { dirname } from 'path';
import jwt from "jsonwebtoken";
import {query} from "express-validator";
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

export async function upload(req, res) {

    const fileBuffer = req.file.buffer;
    let isGenerate = false;
    while (isGenerate === false) {
        const client = await getClient();
        let letters = "0123456789ABCDEF";
        let hex = '';
        for (let i = 0; i < 16; i++)
            hex += letters[(Math.floor(Math.random() * 16))];


        const query = `SELECT * FROM videos WHERE slug='${hex}'`;
        const result = await client.query(query);
        client.end();
        if (result.rows.length === 0) {
            isGenerate = true;
            req.body.slug = hex;
        }
    }

    const finalName = req.body.slug + "." + req.file.originalname.split(".")[1];
    const destinationPath = path.join(__dirname, "../uploads/videos/" + finalName)

    fs.writeFileSync(destinationPath, fileBuffer);
    const client = await getClient();
    const video = {
        title: req.body.title,
        description: req.body.description,
        //TODO thumbnail
        file: "/api/media/video/" + finalName,
        channel: req.body.channel,
        slug: req.body.slug,
        format: req.file.originalname.split(".")[1],
        visibility: req.body.visibility,
    }

    const logger = req.body.logger;
    logger.write("try to upload video");
    const releaseDate = new Date(Date.now()).toISOString();

    const query = `INSERT INTO videos (title, thumbnail, description, channel, visibility, file, slug, format, release_date) VALUES ('${video.title}', 'null', '${video.description}', '${video.channel}', '${video.visibility}', '${video.file}', '${video.slug}', '${video.format}', '${releaseDate}')`;
    await client.query(query);
    logger.write("successfully uploaded video", 200);
    res.status(200).json({"message": "Successfully uploaded video"});

}

export async function uploadThumbnail(req, res) {
    const fileBuffer = req.file.buffer;
    const client = await getClient();
    const videoId = req.body.video;
    const videoSlugQuery = `SELECT * from videos WHERE id = ${videoId}`;
    const result = await client.query(videoSlugQuery);

    const fileName = result.rows[0].slug + "." + req.file.originalname.split(".")[1];
    const destinationPath = path.join(__dirname, "../uploads/thumbnails/", fileName);
    fs.writeFileSync(destinationPath, fileBuffer);

    const logger = req.body.logger;
    logger.action("try to add thumbnail to video " + req.body.video);

    const file = "/api/media/thumbnail/" + fileName;

    const updateQuery = `UPDATE videos SET thumbnail = '${file}' WHERE id = ${req.body.video}`;
    await client.query(updateQuery);
    logger.write("successfully uploaded thumbnail", 200);
    res.status(200).json({"message": "Successfully uploaded thumbnail"});
}

export async function getById(req, res) {
    const id = req.params.id;

    const logger = req.body.logger;
    logger.action("try to get video " + id);
    const client = await getClient();
    const query = `SELECT * FROM videos WHERE id = ${id}`;
    const result = await client.query(query);
    const video = result.rows[0];
    logger.write("successfully get video " + id, 200);
    res.status(200).json(video);
}

export async function getByChannel(req, res) {
    const id = req.params.id;
    const logger = req.body.logger;
    logger.action("try to get video from channel " + id);
    const client = await getClient();
    const query = `SELECT * FROM videos WHERE channel = ${id}`;
    const result = await client.query(query);
    logger.write("successfully get video from channel " + id, 200);
    res.status(200).json(result.rows);
}

export async function update(req, res) {
    const id = req.params.id;
    const logger = req.body.logger;
    logger.action("try to update video " + id);
    const client = await getClient();
    const query = `UPDATE videos SET title='${req.body.title}', description:'${req.body.description}', visibility:'${req.body.visibility}'`;
    await client.query(query);
    logger.write("successfully updated video", 200);
    res.status(200).json({"message": "Successfully updated video"});
}

export async function updateVideo(req, res) {
    const id = req.params.id;
    const logger = req.body.logger;
    logger.action("try to update video file " + id);
    const client = await getClient();
    const videoQuery = `SELECT slug, format FROM videos WHERE id = ${id}`;
    const videoResult = await client.query(videoQuery);
    const video = videoResult.rows[0];
    const slug = video.slug;
    const format = video.format;
    const pathToDelete = path.join(__dirname, "../uploads/videos/", slug + "." +  format );
    fs.unlink(pathToDelete, (error) => {
        if (error) {
            logger.write(error, 500);
            res.status(500).json({"message": "Failed to delete video"});
            return
        }
        logger.action("successfully deleted video " + slug + "." + format );
        const fileBuffer = req.file.buffer;
        const finalName = slug + "." + format;
        const destinationPath = path.join(__dirname, "../uploads/videos/" + finalName)

        fs.writeFileSync(destinationPath, fileBuffer);

        logger.write("successfully updated video", 200);
        res.status(200).json({"message": "Successfully updated video"});
    })


}

export async function del(req, res) {
    const id = req.params.id;
    const logger = req.body.logger;
    logger.action("try to delete video " + id);
    const client = await getClient();
    const query = `SELECT slug, format, thumbnail FROM videos WHERE id = ${id}`;
    const result = await client.query(query);
    const video = result.rows[0];
    const slug = video.slug;
    const format = video.format;
    const thumbnailFile = video.thumbnail.split("/")[4];
    let pathToDelete = path.join(__dirname, "../uploads/videos/", slug + "." + format);
    fs.unlink(pathToDelete, (error) => {
        if (error) {
            logger.write(error, 500);
            res.status(500).json({"message": "Failed to delete video"});
            return
        }

        pathToDelete = path.join(__dirname, "../uploads/thumbnails/", thumbnailFile);
        fs.unlink(pathToDelete, async (error) => {
            if (error) {
                logger.write(error, 500);
                res.status(500).json({"message": "Failed to delete video"});
                return
            }
            const query = `DELETE FROM videos WHERE id = ${id}`;
            await client.query(query);
            logger.write("successfully deleted video", 200);
            res.status(200).json({"message": "Successfully deleted video"});
        })

    })



}

export async function toggleLike(req, res) {
    const id = req.params.id;
    const logger = req.body.logger;
    logger.action("try to toggle like on video " + id);
    const token = req.headers.authorization.split(" ")[1];
    const claims = jwt.decode(token);
    const client = await getClient();
    const userId = claims.id;

    const getLikeQuery = `SELECT * FROM likes WHERE owner = ${userId} AND video = ${id}`;
    const likeResult = await client.query(getLikeQuery);

    if (likeResult.rows.length === 0) {
        const query = `INSERT INTO likes (video, owner) VALUES (${id},${userId})`;
        await client.query(query);
        logger.write("no likes found adding likes for video " + id, 200);
        res.status(200).json({"message": "Successfully added like"});
    } else {
        const query = `DELETE FROM likes WHERE owner = ${userId} AND video = ${id}`;
        await client.query(query);
        logger.write("likes found, removing like for video " + id, 200);
        res.status(200).json({"message": "Successfully removed like"});
    }


}

export async function addTags(req, res) {
    const tags = req.body.tags;
    const videoId = req.params.id;

    const logger = req.body.logger;
    logger.action("try to add tags to video " + videoId);

    const client = await getClient();

    // DECREASE USAGE COUNT FOR ALL TAGS
    const decreaseUsageCountQuery = `UPDATE tags SET usage_count = usage_count - 1 WHERE id IN (SELECT tag FROM video_tags WHERE video = ${videoId})`;
    await client.query(decreaseUsageCountQuery);

    // DELETE ALL TAGS FOR VIDEO
    let deleteQuery = `DELETE FROM video_tags WHERE video = ${videoId}`;
    await client.query(deleteQuery);

    // INSERT NEW TAGS
    for (const tag of tags) {
        const tagQuery = `SELECT * FROM tags WHERE name = '${tag}'`;
        const tagResult = await client.query(tagQuery);
        let id = null;

        if (tagResult.rows.length === 0) {
            const insertTagQuery = `INSERT INTO tags (name, usage_count) VALUES ('${tag}', 1) RETURNING id`;
            const result = await client.query(insertTagQuery);
            id = result.rows[0].id;
        } else {
            logger.write("Tag " + tag + " already exists for video " + videoId, 200);
            const getTagQuery = `SELECT usage_count FROM tags WHERE name = '${tag}'`;
            const getTagResult = await client.query(getTagQuery);
            const usageCount = getTagResult.rows[0].usage_count + 1;
            const updateTagQuery = `UPDATE tags SET usage_count = ${usageCount} WHERE name = '${tag}'`;
            await client.query(updateTagQuery);
            id = tagResult.rows[0].id;
        }

        console.log("Tag ID: ", id);
        console.log("Video ID: ", videoId);

        // INSERT INTO video_tags
        const insertVideoTagQuery = `INSERT INTO video_tags (tag, video) VALUES (${id}, ${videoId})`;
        await client.query(insertVideoTagQuery);
    }
    logger.write("successfully added tags to video " + videoId, 200);
    await client.end();
    res.status(200).json({"message": "Successfully added tags to video"});

}