"use strict";

const path = require('path');
const fs = require('fs');
const Archiver = require('archiver');

const getReport = (releasePath, callback) => {
    const reportFile = releasePath + "report.json";

    fs.exists(reportFile, (exists) => {
        if (!exists) {
            return callback("ReportFileNotFound: " + reportFile);
        }

        return fs.readFile(reportFile, (err, dataBuffer) => {
            if (err) {
                return callback(err, reportFile);
            }
            const data = dataBuffer.toString();
            if (!data) {
                return callback("ReportFileNotFound", reportFile);
            }
            const report = JSON.parse(data);
            return callback(null, report);
        });
    });
};

const getDatePart = (report) => {
    if (!report.date) {
        return "unknowndate";
    }

    const date = new Date(report.date);
    const paddingLeft = (str, paddingValue) => String(paddingValue + str).slice(-paddingValue.length);

    return date.getFullYear() + "." +
        paddingLeft(date.getMonth() + 1, "00") + "." +
        paddingLeft(date.getDate(), "00") + "." +
        paddingLeft(date.getHours(), "00") + "." +
        paddingLeft(date.getMinutes(), "00") + "." +
        paddingLeft(date.getSeconds(), "00");
};

module.exports = (req, res, next) => {
    const options = {
        owner: req.params.owner,
        reponame: req.params.reponame,
        branchName: req.params.branch,
        branch: "/refs/heads/" + req.params.branch,
        rev: req.params.rev
    };

    const releasePath = path.normalize(req.app.get('releasepath') + "/" + options.owner + "/" + options.reponame + "/" + options.branch + "/" + options.rev + "/");

    getReport(releasePath, (err, report) => {
        if (err) {
            return next(err);
        }

        const archive = new Archiver("zip");
        archive.on("error", next);
        res.attachment(options.reponame + '.' + getDatePart(report) + '.' + options.rev + '.zip', '.');
        archive.pipe(res);
        archive.directory(releasePath, false);
        archive.finalize();
    });
};