#!/usr/node/bin/node

"use strict";

var CronJob = require('cron').CronJob;
var async = require('async');
var util = require('util');

var config = require('./lib/config.js');
var dspattern = require('./lib/dspattern.js');
var SnapshotSet = require('./lib/snapshotset.js');

function applySnap(job, ds, cb) {
    util.log('Process ' + ds + '@' + job.tag);
    var s = new SnapshotSet(ds, job.tag);
    s.snapshot(function (err) {
        if (err) {
            cb(err);
        }

        s.prune(job.keep, cb);
    });
}

function snap(job) {
    async.mapSeries(job.dataset, dspattern, function (err, datasets) {
        if (err) {
            throw err;
        }

        var merged = [];
        merged = merged.concat.apply(merged, datasets);

        var snapSets = merged.map(function (ds) {
            return new SnapshotSet(ds, job.tag);
        });

        async.forEachSeries(snapSets, function (snapSet, cb) {
            snapSet.snapshot(cb);
        }, function () {
            async.forEachSeries(snapSets, function (snapSet, cb) {
                snapSet.prune(job.keep, cb);
            });
        });
    });
}

var cronJobs = [];
var jobs = config(process.argv[2]);

jobs.forEach(function (job) {
    util.log('Scheduling ' + job.tag + ' at ' + job.schedule)
    var cronJob = new CronJob('00 ' + job.schedule, function () {
        snap(job);
    }, null, true);
    cronJobs.push(cronJob);
});