//初始化echarts图表
function getData(variable, callback){
    var params = {variable: variable};
    $.get( "/observe/data", params, function( data ) {
        callback(data);
    });
}

function makeChart(legendsList, categoriesList, seriesList){
    var myChart = echarts.init(document.getElementById('observe'));

    var option = {
        title : { text: '监测数据可视化' },
        tooltip : { trigger: 'axis' },
        legend: { data: legendsList },
        toolbox: {
            show : true,
            feature : {
                mark : {show: true},
            }
        },
        calculable : false,
        xAxis : [
            {
                type : 'category',
                boundaryGap : false,
                data : categoriesList
            }
        ],
        yAxis : [
            {
                type : 'value',
                axisLabel : {
                    formatter: '{value}'
                }
            }
        ],
        series : seriesList
    };

    myChart.setOption(option, true);

    return myChart;
}

var series = [];
var legends = [];
var currentCategory = [];

getData('ta_1_avg', function(data){
    var values = [];
    for(var i in data){
        values.push(data[i][0]);
        currentCategory.push(data[i][1]);
    }

    var legendTitle = "气温";

    legends.push(legendTitle);

    series.push({
        name: legendTitle,
        type: 'line',
        data: values
    });

    makeChart(legends, currentCategory, series)
});

$('.variable').click(function(){
    var variable = $(this).val();
    var legend = $(this).parent().text();
    if (this.checked === false) {
        for(var i in legends){
            if(legends[i] === legend){
                legends.splice(i, 1)
            }
        }

        for(var k in series){
            if(series[k].name === legend){
                console.log(series[k].name)
                series.splice(k, 1)
                console.log(series)
            }
        }

        makeChart(legends, currentCategory, series)
    } else {
        getData(variable, function(data){
            var values = [];
            currentCategory = [];
            for(var i in data){
                values.push(data[i][0]);
                currentCategory.push(data[i][1]);
            }

            legends.push(legend);

            series.push({
                name: legend,
                type: 'line',
                data: values
            });

            makeChart(legends, currentCategory, series)
        })
    }
});