import { downloadFile } from "../../../actions/azurestorage";

import nextConnect from "next-connect";
import { hashAPIPath } from "../../../actions/core/hash";
import middleware from "../middleware/middleware";
import { respondError } from "../middleware/apiResponse";

const ApiProxy = nextConnect();

ApiProxy.use(middleware);

ApiProxy.get(async (req, res) => {
    var containerName = req.query.container;
    var casefolderID = req.query.casefolderID;
    var blobName = req.query.blobname;
    var checkHash = req.query.hash;

    if (
        typeof containerName === "undefined" ||
        containerName.length === 0 ||
        typeof casefolderID === "undefined" ||
        casefolderID.length === 0 ||
        typeof blobName === "undefined" ||
        blobName.length === 0 ||
        typeof checkHash === "undefined" ||
        checkHash.length === 0
    ) {
        return respondError(res, {
            status: 400,
            code: "MISSING_REQUIRED_QUERY",
            message: "container, casefolderID, blobname and hash are required"
        });
    }

    var checkquerypath =
        "/api/file/downloadblob?container=" +
        containerName +
        "&casefolderID=" +
        casefolderID +
        "&blobname=" +
        blobName.trim();

    if (hashAPIPath(checkquerypath) != "&hash=" + checkHash) {
        return respondError(res, {
            status: 400,
            code: "INVALID_HASH",
            message: "Invalid hash"
        });
    }

    const bloblocation =
        casefolderID + (blobName.indexOf(".json") > 0 ? "/" : "/files/");

    const downloaded = await downloadFile(
        containerName,
        bloblocation + decodeURI(blobName)
    );

    res.setHeader(
        "content-disposition",
        "attachment; filename=" + decodeURI(blobName)
    );
    return res.status(200).send(downloaded);
});

async function streamToBuffer(readableStream) {
    return new Promise((resolve, reject) => {
        const chunks = [];
        readableStream.on("data", (data) => {
            chunks.push(data instanceof Buffer ? data : Buffer.from(data));
        });
        readableStream.on("end", () => {
            resolve(Buffer.concat(chunks));
        });
        readableStream.on("error", reject);
    });
}

export const config = {
    api: {
        bodyParser: false
    }
};

export default ApiProxy;