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

var pool = mysql.createPool(config.mysql);

var start_date = moment().add(-1, 'days').format('YYYY-MM-DD');//'2017-11-11';
var end_date   = moment().add(-1, 'days').format('YYYY-MM-DD');//'2018-01-07';

console.log(moment().format('YYYY-MM-DD HH:mm:ss') + " => sync minutely data from " + start_date + " to " + end_date);

var days = moment(end_date).diff(moment(start_date), 'days');
for (var i = 0; i <= days; i++) {
    var date_day = moment(start_date).add(i, "days");
    for(var j = 0; j < 24; j++) {
        var date_hour = moment(date_day).add(j, "hours").format("YYYY-MM-DD HH:00:00");
        for(var k = 0; k < 60; k++) {
            var start = moment(date_hour).add(k, 'minutes').format("YYYY-MM-DD HH:mm:00");
            var end = moment(date_hour).add(k+1, 'minutes').format("YYYY-MM-DD HH:mm:00");

            fetchDeviceMinutelyData(start, end);
        }
    }
}

function fetchDeviceMinutelyData(start, end) {
    pool.getConnection(function (err, connection) {
        var devices = {};
        var sql = "SELECT mac, mac_key, avg(mac_value) as avg_val, min(mac_value) as min_val, max(mac_value) as max_val FROM history WHERE time >= '" + start + "' AND time < '" + end + "' GROUP BY mac, mac_key ORDER BY mac";
        //console.log(sql);
        connection.query(sql, function (error, results, fields) {
            if (error) throw error;

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

            results.forEach(function(data) {
                var mac = data.mac;
                var key = data.mac_key;
                var val = data.avg_val;
                if(devices[mac] == null) {
                    devices[mac] = {
                        mac: mac,
                        time: moment(start).format('YYYY-MM-DD HH:mm:00')
                    };
                }
                devices[mac][key] = [val.toFixed(3), data.min_val, data.max_val]
            });

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

            // console.log(JSON.stringify(device_data));
            if(device_data.length > 0) {
                insertDeviceData(device_data, connection);
            }
        });
    });
}

function insertDeviceData(docs, connection) {
    var data = [];
    docs.forEach(function(doc) {
        var mac = doc.mac;
        var time = doc.time;
        delete doc.mac;
        delete doc.time;
        data.push([mac, time, JSON.stringify(doc)]);
    });

    connection.query("INSERT INTO data (mac, time, json) VALUES ?", [data], function (error, results, fields) {
        if (error) throw error;

        connection.destroy();
    });
}