'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'),
    path = require('path'),
    paths = require('./paths.js'),
    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);
}

// options only supports ignoredApps = [ appId ]
function rebuild(options, callback) {
    assert.strictEqual(typeof options, 'object');
    assert.strictEqual(typeof callback, 'function');

    if (options.ignoredApps) assert(Array.isArray(options.ignoredApps), 'Expecting ignoredApps to be an array');

    debug('rebuilding container');

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

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

        let dataDirs = [];
        result.forEach(function (app) {
            if (!app.dataDir) return;

            if (options.ignoredApps && options.ignoredApps.indexOf(app.id) !== -1) {
                debug(`Ignoring volume for ${app.id}`);
                return;
            }

            dataDirs.push({
                hostDir: app.dataDir || path.join(paths.APPS_DATA_DIR, app.id, 'data'),
                // /data is required since this is where the localstorage data would be in APPS_DATA_DIR
                mountDir: `/app/data/${app.id}/data`
            });
        });

        debug('extra app volume mounts', dataDirs);

        // ignore error if container not found (and fail later) so that this code works across restarts
        async.series([
            shell.exec.bind(null, 'stopSftpContainer', 'docker stop sftp || true'),
            shell.exec.bind(null, 'stopSftpContainer', 'docker rm -f sftp || true')
        ], function (error) {
            if (error) debug('Failed to stop sftp container. Possibly not running.');

            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}"`;

            shell.exec('startSftp', cmd, callback);
        });
    });
}