var mysql = require('mysql');
var moment = require('moment');
var config = require('./config');
var mongoClient = require('mongodb').MongoClient;

var mysqlClient = mysql.createConnection(config.mysql);

mysqlClient.connect(function(error) {
    if (error) return;
    console.log("connected to MySQL");
});


var start_date = '2017-11-11';
var end_date   = '2018-01-02';

var days = moment(end_date).diff(moment(start_date), 'days');
for (var i = 0; i <= days; i++) {
    var date = moment(start_date).add(i, "days");
    for(var j = 0; j < 24; j++) {
        var start = moment(date).add(j, 'hours').format("YYYY-MM-DD HH:00:00");
        var end = moment(date).add(j+1, 'hours').format("YYYY-MM-DD HH:00:00");

        //console.log(start + " : " + end);
        fetchDeviceDailyData(start, end);
    }
}

mysqlClient.end();

function fetchDeviceDailyData(start, end) {
    var devices = {};
    var sql = "SELECT mac, mac_key, avg(mac_value) as mac_value FROM history WHERE time >= '" + start + "' AND time < '" + end + "' GROUP BY mac, mac_key ORDER BY mac";
    //console.log(sql);
    mysqlClient.query(sql, function (error, results, fields) {
        if (error) throw error;

        results.forEach(function(data) {
            var mac = data.mac;
            var key = data.mac_key;
            var val = data.mac_value;
            if(devices[mac] == null) {
                devices[mac] = {
                    mac: mac,
                    time: moment(moment(start, 'YYYY-MM-DD HH:00:00').valueOf() + 8*60*60*1000).toDate()
                };
            }
            devices[mac][key] = val;
        });

        var device_data = [];
        for(var mac in devices) {
            device_data.push(devices[mac]);
        }

        //console.log(device_data);
        if(device_data.length > 0) {
            insertDeviceData(device_data);
        }
    });
}

function insertDeviceData(docs) {
    mongoClient.connect(config.mongo, {
        poolSize: 10,
        keepAlive: 300000,
        auto_reconnect: true,
        reconnectTries: 1000,
        reconnectInterval: 5000,
        connectTimeoutMS: 30000
    }, function(err, client) {
        if (err) {
            console.log(err.message);
            return;
        }
        client.db('monitor').collection('data_hourly').insertMany(docs, function(err2, doc2) {
            if (err2) {
                console.log(err2.message);
                return;
            }
            client.close();
        });
    });
}