'use strict';

var zoom = 'hour';
var selectedContainerId = null;

var unitRound = function(i) {
    return parseFloat(Math.round(i * 100) / 100).toFixed(2);
};

var getReadableUnit = function(i) {
    if (i < 1024) return unitRound(i) + ' B';
    if (i < 1024*1024) return unitRound(i/1024) + ' KB';
    if (i < 1024*1024*1024) return unitRound(i/1024/1024) + ' MB';
    if (i < 1024*1024*1024*1024) return unitRound(i/1024/1024/1024) + ' GB';
    if (i < 1024*1024*1024*1024*1024) return unitRound(i/1024/1024/1024/1024) + ' TB';
    if (i < 1024*1024*1024*1024*1024*1024) return unitRound(i/1024/1024/1024/1024/1024) + ' PB';
};

var addStatRow = function(list, row) {
    var tr = $(document.createElement('tr'));
    var td0 = $(document.createElement('td'));
    var td1 = $(document.createElement('td'));
    var td2 = $(document.createElement('td'));
    var td3 = $(document.createElement('td'));
    var td4 = $(document.createElement('td'));
    var td5 = $(document.createElement('td'));
    var td6 = $(document.createElement('td'));
    
    td0.text(row.ts);
    td1.text(row.cpu + '%');
    td2.text(getReadableUnit(row.mem));
    td3.text(getReadableUnit(row.net_in));
    td4.text(getReadableUnit(row.net_out));
    td5.text(getReadableUnit(row.block_in));
    td6.text(getReadableUnit(row.block_out));
    
    tr.append(td0, td1, td2, td3, td4, td5, td6);
    list.append(tr);
};

var renderLatestStats = function(containerId) {
    $.get('/rs/container/'+containerId+'/stats/latest', function(data) {
        var list = $('#container-stats-latest > tbody');
        list.empty();
        for (var i=0; i<data.length; i++) {
            var row = data[i];
            addStatRow(list, row);
        }
    });
};

var renderChart = function(elementId, containerId, chart) {
    var url;
    if (containerId) {
        url = '/rs/container/'+containerId+'/'+chart+'/'+zoom;
    } else {
        url = '/rs/all/'+chart+'/'+zoom;
    }
    $.get(url, function(stats) {
        $('#'+elementId).show();
        $('#'+elementId+'-warn').hide();
        if (stats.length <= 1) {
            $('#'+elementId).hide();
            $('#'+elementId+'-warn').show();
            return;
        }
        var data = google.visualization.arrayToDataTable(stats);
        var options = {
            legend: { position: 'right' }
        };
        var chart = new google.visualization.LineChart(document.getElementById(elementId));
        chart.draw(data, options);
    });
};

var renderContainerStats = function(id) {
    renderLatestStats(id);
    renderChart('mem-chart', id, 'mem');
    renderChart('net-in-chart', id, 'net_in');
    renderChart('net-out-chart', id, 'net_out');
    renderChart('block-in-chart', id, 'block_in');
    renderChart('block-out-chart', id, 'block_out');
};

var selectContainer = function(id, name) {
    $('#selected-container').text('Selected container: ' + (name ? name : id) + ' (click to change)');
    $('#container-list-collapse').collapse('hide');
    $('#container-stats').show();
    renderContainerStats(id);
    selectedContainerId = id;
};

var renderAllContainerStats = function() {
    renderChart('mem-chart', null, 'mem');
    renderChart('net-in-chart', null, 'net_in');
    renderChart('net-out-chart', null, 'net_out');
    renderChart('block-in-chart', null, 'block_in');
    renderChart('block-out-chart', null, 'block_out');
};

var reRenderCharts = function() {
    if (selectedContainerId) {
        renderContainerStats(selectedContainerId);
    } else {
        renderAllContainerStats();
    }
};

var addItemToContainerList = function(list, container) {
    var tr = $(document.createElement('tr'));
    var td1 = $(document.createElement('td'));
    var td2 = $(document.createElement('td'));
    var link = $(document.createElement('a'));
    
    link.attr('href', '#');
    link.click(function() {
        selectContainer(container.id, container.name);
        return false;
    });
    link.text(container.id);
    td1.append(link);
    td2.text(container.name);
    
    tr.append(td1, td2);
    list.append(tr);
};

var loadContainerList = function() {
    $.get('/rs/containers/get', function(data) {
        var list = $('#container-list > tbody');
        for (var i=0; i<data.length; i++) {
            var container = data[i];
            addItemToContainerList(list, container);
        }
    });
};

var onZoomButtonClick = function(level) {
    zoom = level;
    $('#zoom-buttons > button').removeClass('btn-primary');
    $('#zoom-'+level).addClass('btn-primary');
    reRenderCharts();
};

var initZoomButton = function() {
    $('#zoom-hour').click(function() { onZoomButtonClick('hour'); });
    $('#zoom-day').click(function() { onZoomButtonClick('day'); });
    $('#zoom-week').click(function() { onZoomButtonClick('week'); });
    $('#zoom-month').click(function() { onZoomButtonClick('month'); });
};

var init = function() {
    google.charts.load('current', {packages: ['corechart']});
    initZoomButton();
    loadContainerList();
    renderAllContainerStats();
};

$(document).ready(init);