#!/usr/bin/env node

var cli = require('cli'),
    options = cli.parse({
        leave: ['l', 'Period of time', 'string', '6m'],
        name: ['n', 'MongoDb database name', 'string', 'statsd'],
        host: ['h', 'MongoDb host', 'string', 'mongodb'],
	    port: ['p', 'MongoDb port', 'string', '27017']
    })
;

var mongo = require('mongodb');

var moment = require('moment');
var n = parseInt(options.leave, 10);
var from = moment().subtract(n, options.leave.replace(n, '')).format('X');
var to = moment().format('X');

mongo.connect("mongodb://" + options.host + ":" + options.port + "/" + options.name, function (err, db) {
    if (err) {
        db.close();
        console.log(err);
        throw err;
    }
    db.listCollections().toArray(function(err, collInfos) {
        if (err) {
            db.close();
            console.log(err);
            throw err;
        }
        for (var i = 0; i < collInfos.length; i++) {
            console.log('db.collection('+collInfos[i].name+').remove({ time: { $lte: '+from+', $gte: '+to+' } })');
            db.collection(""+collInfos[i].name).remove({ time: { $lte: from, $gte: to } });
        }
        db.close();
    });
});