'use strict';

exports = module.exports = {
    startSftp: startSftp,
    rebuild: rebuild
};

var apps = require('./apps.js'),
    assert = require('assert'),
    async = require('async'),
    debug = require('debug')('box:sftp'),
    infra = require('./infra_version.js'),
    safe = require('safetydance'),
    shell = require('./shell.js');

function startSftp(existingInfra, callback) {
    assert.strictEqual(typeof existingInfra, 'object');
    assert.strictEqual(typeof callback, 'function');

    if (existingInfra.version === infra.version && infra.images.sftp.tag === existingInfra.images.sftp.tag) return callback();

    rebuild(callback);
}

var rebuildInProgress = false;
function rebuild(callback) {
    assert.strictEqual(typeof options, 'object');
    assert.strictEqual(typeof callback, 'function');

    if (rebuildInProgress) {
        debug('waiting for other rebuild to finish');
        return setTimeout(function () { rebuild(callback); }, 5000);
    }

    rebuildInProgress = true;

    function done(error) {
        rebuildInProgress = false;
        callback(error);
    }

    debug('rebuilding container');

    const tag = infra.images.sftp.tag;
    const memoryLimit = 256;

    apps.getAll(function (error, result) {
        if (error) return done(error);

        let dataDirs = [];
        result.forEach(function (app) {
            if (!app.manifest.addons['localstorage']) return;

            const hostDir = apps.getDataDir(app, app.dataDir), mountDir = `/app/data/${app.id}`;
            if (!safe.fs.existsSync(hostDir)) {
                // do not create host path when cloudron is restoring. this will then create dir with root perms making restore logic fail
                debug(`Ignoring volume for ${app.id} since it does not exist`);
                return;
            }

            dataDirs.push({ hostDir, mountDir });
        });

        const appDataVolumes = dataDirs.map(function (v) { return `-v "${v.hostDir}:${v.mountDir}"`; }).join(' ');

        const cmd = `docker run --restart=always -d --name="sftp" \
                    --hostname sftp \
                    --net cloudron \
                    --net-alias sftp \
                    --log-driver syslog \
                    --log-opt syslog-address=udp://127.0.0.1:2514 \
                    --log-opt syslog-format=rfc5424 \
                    --log-opt tag=sftp \
                    -m ${memoryLimit}m \
                    --memory-swap ${memoryLimit * 2}m \
                    --dns 172.18.0.1 \
                    --dns-search=. \
                    -p 222:22 \
                    ${appDataVolumes} \
                    -v "/etc/ssh:/etc/ssh:ro" \
                    --label isCloudronManaged=true \
                    --read-only -v /tmp -v /run "${tag}"`;

        // ignore error if container not found (and fail later) so that this code works across restarts
        async.series([
            shell.exec.bind(null, 'stopSftp', 'docker stop sftp || true'),
            shell.exec.bind(null, 'removeSftp', 'docker rm -f sftp || true'),
            shell.exec.bind(null, 'startSftp', cmd)
        ], done);
    });
}