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) => {
    const containerName = req.query.container;
    const casefolderID = req.query.casefolderID;
    const blobName = req.query.blobname;
    const 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"
        });
    }

    const blobNameTrimmed = blobName.trim();
    const hashCandidatePaths = [
        "/api/file/downloadblob?container=" +
            containerName +
            "&casefolderID=" +
            casefolderID +
            "&blobname=" +
            blobNameTrimmed,
        "/api/file/downloadblob?container=" +
            containerName +
            "&casefolderID=" +
            encodeURIComponent(casefolderID) +
            "&blobname=" +
            blobNameTrimmed,
        "/api/file/downloadblob?container=" +
            containerName +
            "&casefolderID=" +
            casefolderID +
            "&blobname=" +
            encodeURIComponent(blobNameTrimmed),
        "/api/file/downloadblob?container=" +
            containerName +
            "&casefolderID=" +
            encodeURIComponent(casefolderID) +
            "&blobname=" +
            encodeURIComponent(blobNameTrimmed)
    ];

    const isHashValid = hashCandidatePaths.some(
        (candidatePath) => hashAPIPath(candidatePath) == "&hash=" + checkHash
    );

    if (!isHashValid) {
        return respondError(res, {
            status: 400,
            code: "INVALID_HASH",
            message: "Invalid hash"
        });
    }

    try {
        const decodedBlobName = decodeURI(blobName);
        const normalizedBlobName = decodedBlobName.startsWith(
            casefolderID + "/"
        )
            ? decodedBlobName
            : casefolderID +
              (decodedBlobName.indexOf(".json") > 0 ? "/" : "/files/") +
              decodedBlobName;

        const downloaded = await downloadFile(
            containerName,
            normalizedBlobName
        );
        const responseFileName = decodedBlobName.split("/").pop();

        res.setHeader(
            "content-disposition",
            "attachment; filename=" + responseFileName
        );
        return res.status(200).send(downloaded);
    } catch (error) {
        return respondError(res, {
            status: 400,
            code: "DOWNLOAD_BLOB_FAILED",
            message: "Unable to download blob"
        });
    }
});

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

export default ApiProxy;