import fs from "fs";
import path from "path";
import _ from "lodash";
import { DSQL_DATASQUIREL_BACKUPS } from "../../../../types/dsql";
import { APIResponseObject } from "../../../../types";
import grabDirNames from "../../../../utils/backend/names/grab-dir-names";
import { NextApiResponse } from "next";
import { execSync } from "child_process";

type Params = {
    backup: DSQL_DATASQUIREL_BACKUPS;
    res: NextApiResponse;
};

export default async function downloadBackup({
    backup,
    res,
}: Params): Promise<APIResponseObject> {
    try {
        const { mainBackupDir, userBackupDir, tempBackupExportName } =
            grabDirNames({
                userId: backup.user_id,
            });

        if (backup.user_id && !userBackupDir) {
            return {
                success: false,
                msg: `Error grabbing user backup directory`,
            };
        }

        if (!backup.uuid) {
            return {
                success: false,
                msg: `No UUID found for backup`,
            };
        }

        const allBackupsDir =
            backup.user_id && userBackupDir ? userBackupDir : mainBackupDir;

        const targetBackupDir = path.join(allBackupsDir, backup.uuid);

        const zipFilesCmd = execSync(
            `tar -cJf ${tempBackupExportName} ${backup.uuid}`,
            {
                cwd: allBackupsDir,
            }
        );

        const exportFilePath = path.join(allBackupsDir, tempBackupExportName);

        const readStream = fs.createReadStream(exportFilePath);
        readStream.pipe(res);

        readStream.on("end", () => {
            console.log("Pipe Complete!");
            setTimeout(() => {
                execSync(`rm -f ${tempBackupExportName}`, {
                    cwd: allBackupsDir,
                });
            }, 1000);
        });

        return { success: true };
    } catch (error: any) {
        return {
            success: false,
            msg: `Failed to write backup files`,
            error: error.message,
        };
    }
}