var express = require('express');
var morgan = require('morgan');
var bodyParser = require('body-parser');
var _ = require('lodash');
var app = express();


var mysql      = require('mysql');
var connection =  mysql.createConnection({
  host     : 'mysql',
  user     : 'root',
  password : '235r2342gtfsw',
  database : 'statsd_db'
});

app.use(morgan('combined'))

app.use(bodyParser.json());

var timeserie = [
	{'target': 's1', 'datapoints':  [ [0,0], [1,0], [2,0], [3,0], [4,0] , [5,0], [6,0] , [7,0], [8,0], [9,0], [10,0], [11,0], [12,0], [13,0], [14,0], [15,0]]},
	{'target': 's2', 'datapoints':  [ [15,0], [14,0], [13,0], [12,0], [11,0] , [10,0], [9,0] , [8,0], [7,0], [6,0], [5,0], [4,0], [3,0], [2,0], [1,0], [0,0]]},
	{'target': 's3', 'datapoints':  [ [0,0], [1,0], [2,0], [3,0], [4,0] , [5,0], [6,0] , [7,0], [8,0], [9,0], [10,0], [11,0], [12,0], [13,0], [14,0], [15,0]]},
	{'target': 's4', 'datapoints':  [ [15,0], [14,0], [13,0], [12,0], [11,0] , [10,0], [9,0] , [8,0], [7,0], [6,0], [5,0], [4,0], [3,0], [2,0], [1,0], [0,0]]},
	{'target': 's5', 'datapoints':  [ [0,0], [1,0], [2,0], [3,0], [4,0] , [5,0], [6,0] , [7,0], [8,0], [9,0], [10,0], [11,0], [12,0], [13,0], [14,0], [15,0]]},
	{'target': 's6', 'datapoints':  [ [15,0], [14,0], [13,0], [12,0], [11,0] , [10,0], [9,0] , [8,0], [7,0], [6,0], [5,0], [4,0], [3,0], [2,0], [1,0], [0,0]]}
	]; //require('./series');

var now = Date.now();

for (var i = timeserie.length -1; i >= 0; i--) {
  var series = timeserie[i];
  var decreaser = 0;
  for (var y = series.datapoints.length -1; y >= 0; y--) {
    series.datapoints[y][1] = Math.round((now - decreaser) /1000) * 1000;
    decreaser += 50000;
  }
}

var annotation = {
  name : "annotation name",
  enabled: true,
  datasource: "generic datasource",
  showLine: true,
}

var annotations = [
  { annotation: annotation, "title": "Donlad trump is kinda funny", "time": 1450754160000, text: "teeext", tags: "taaags" },
  { annotation: annotation, "title": "Wow he really won", "time": 1450754160000, text: "teeext", tags: "taaags" },
  { annotation: annotation, "title": "When is the next ", "time": 1450754160000, text: "teeext", tags: "taaags" }
];

var now = Date.now();
var decreaser = 0;
for (var i = 0;i < annotations.length; i++) {
  var anon = annotations[i];
  anon.time = (now - decreaser);
  decreaser += 1000000
}

var table =
  {
    columns: [{text: 'Time', type: 'time'}, {text: 'Country', type: 'string'}, {text: 'Number', type: 'number'}],
    values: [
      [ 1234567, 'SE', 123 ],
      [ 1234567, 'DE', 231 ],
      [ 1234567, 'US', 321 ],
    ]
  };
  
function setCORSHeaders(res) {
  res.setHeader("Access-Control-Allow-Origin", "*");
  res.setHeader("Access-Control-Allow-Methods", "POST");
  res.setHeader("Access-Control-Allow-Headers", "accept, content-type");  
}


var now = Date.now();
var decreaser = 0;
for (var i = 0;i < table.values.length; i++) {
  var anon = table.values[i];

  anon[0] = (now - decreaser);
  decreaser += 1000000
}

app.all('/', function(req, res) {
  setCORSHeaders(res);
  res.send('https://grafana.com/plugins/grafana-simple-json-datasource\n');
  res.end();
});

var result = [];
function search(table)
{
    connection.query('SELECT `name` FROM `' + table + '` GROUP BY `name` ORDER BY `name`', function (err, rows, fields) {
        if (err)
            throw err;
        _.each(rows, function (ts) {
            if (result.indexOf(ts.name) === -1) { // Se agregan solo los name que no esten en result
                result.push(ts.name);
            }
        });
    });

}
app.all('/search', function (req, res) {
    setCORSHeaders(res);
    
    search('gauges_statistics');
    search('counters_statistics');
    search('timers_statistics');
    search('sets_statistics');
        
    res.json(result);
    res.end();
});

/**
 * Este metodo no esta implementado.
 */
//app.all('/annotations', function(req, res) {
//  setCORSHeaders(res);
//  console.log(req.url);
//  console.log(req.body);
//
//  res.json(annotations);
//  res.end();
//})

/**
 * @todo :  intervalMs: 500,
 *          targets: [ { 
 * 		type: 'timeserie' 
 * 	    }]
 * 	    maxDataPoints: 1920,
 * 
 */
var tsResult = [];
function query(table, req)
{
    var from = new Date(req.body.range.from);
    var to = new Date(req.body.range.to);
    var from_str = Math.floor(from.getTime() / 1000);
    var to_str = Math.floor(to.getTime() / 1000);
    var names = _.map(req.body.targets, function (t) {
        return t.target
        console.log(t);
    });
    var sql = 'SELECT timestamp, name, AVG(value) as value FROM `' + table + '` WHERE (timestamp BETWEEN ' + from_str + ' AND ' + to_str + ') AND (`name` IN ("' + names.join('", "') + '")) ORDER BY timestamp ASC';

    var interval = req.body.intervalMs / 1000;
    var group_by = ' GROUP BY UNIX_TIMESTAMP(timestamp) DIV ' + interval;

    var maxDataPoints = req.body.maxDataPoints;
    var limit = ' LIMIT ' + maxDataPoints;

    sql += group_by + limit;
    console.log(sql);
    connection.query(sql, function (err, rows, fields) {
        var result = {};
        _.each(rows, function (d) {
            if (!(d.name in result)) {
                result[d.name] = new Array();
            }
            (result[d.name]).push([d.value, 1000 * d.timestamp]);
        });

        _.each(_.keys(result), function (d) {
            var data = {target: d};
            data['datapoints'] = result[d];
            tsResult.push(data);
        });
    });
}

app.all('/query', function (req, res) {
    setCORSHeaders(res);
    console.log(req.url);
    console.log(req.body);

    query('gauges_statistics', req);
    query('counters_statistics', req);
    query('timers_statistics', req);
    query('sets_statistics', req);

    res.json(tsResult);
    res.end();
});

app.listen(8000);

console.log("Server is listening to port 8000");