Yogu/site-manager

var Task = require('../task.js');
var Q = require('q');
var fs = require('q-io/fs');

/**
 * Resets a staging site to its production site by restoring a backup of production
 * @option backup set to false to skip the backup before restore
 */
function ResetStagingTask(site, options) {
    Task.call(this);
    this.site = site;
    this.name = 'Reset to ' + site.stagingOf;
    this.options = options || {};
}

ResetStagingTask.prototype = Object.create(Task.prototype);

ResetStagingTask.prototype.perform = function*() {
    var site = this.site;

    if (!site.stagingOf) {
        throw new Error('This is not a staging site, stagingOf is not set in config');
    }

    var productionSite = site.siteManager.getSite(site.stagingOf);
    if (!productionSite) {
        throw new Error('This is configured to be staging of ' + site.stagingOf +
            ', but that site does not exist.');
    }

    var backupTask = productionSite.backupTask("for reset of " + site.name);
    productionSite.schedule(backupTask);
    this.doLog('Waiting for backup of ' + site.stagingOf + ' to complete...');
    var backupRevision = yield backupTask;
    this.doLog('Backup completed with revision ' + backupRevision + ', restoring that...');
    // pass the skip-backup option
    yield this.runNested(site.restoreTask(backupRevision, { backup: this.options.backup }));
};

module.exports = ResetStagingTask;