const app = require('express').Router();
const fs = require('fs');
const checkPermission = require("../middlewares/checkPermission");
const mediaValidation = require("../validation/mediaValidation");
const crypto = require('crypto');
const Media = require("../models/Media");

app.put("/", checkPermission("admin.media.upload"), async (req, res) => {
    // Validate request
    const {error} = mediaValidation.upload.validate(req.body);
    if (error) return res.status(400).json({message: error.details[0].message});

    // Check if file was provided
    if (req.files && req.files.asset) {
        const asset = req.files.asset;
        const assetID = crypto.randomBytes(8).toString('hex');
        const splittedAsset = asset.name.split(".");
        const assetEnding = splittedAsset[splittedAsset.length - 1];

        // Check if the asset exists
        const {count: assetCount} = await Media.findAndCountAll({where: {assetID: assetID}});
        if (assetCount === 1) return res.status(400).json({message: "This asset already exists"});

        // Create the asset
        await Media.create({
            assetID: assetID, assetCreator: req.token, assetEnding: assetEnding,
            assetName: asset.name, assetDescription: req.body.assetDescription
        });

        // Move the asset to the upload directory
        await req.files.asset.mv(process.env.CDN_MEDIA_PATH + "/" + assetID);

        // Send response
        res.status(200).json({
            message: "Asset successfully uploaded", id: assetID,
            url: "https://cdn.sheepstar.xyz/" + assetID + "." + assetEnding
        });
    } else res.status(400).json({message: "You must provide an asset"});
});

app.delete("/:assetID", checkPermission("admin.media.delete"), async (req, res) => {
    // Validate request
    if (!req.params.assetID) return res.status(400).json({message: "You must provide an asset ID"});

    // Check if asset exists
    const {count} = await Media.findAndCountAll({where: {assetID: req.params.assetID}});
    if (count === 0) res.status(404).json({message: "The provided asset does not exist."});

    // Delete asset
    try {
        fs.unlinkSync(process.env.CDN_MEDIA_PATH + "/" + req.params.assetID);
        await Media.destroy({where: {assetID: req.params.assetID}});
    } catch (e) {
        return res.status(500).json({message: "The provided asset could not be deleted"});
    }

    res.status(200).json({message: "Asset successfully deleted"});
});

app.get("/:assetID", checkPermission("admin.media.info"), async (req, res) => {
    // Validate request
    if (!req.params.assetID) return res.status(400).json({message: "You must provide an asset ID"});

    // Check if asset exists
    const {count, rows} = await Media.findAndCountAll({where: {assetID: req.params.assetID}});
    if (count === 0) res.status(404).json({message: "The provided asset does not exist."});

    // Return response
    res.status(200).json(rows);
});

module.exports = app;