/*=========================================================================================

    File Name: multi-series-line.js

    Description: D3 multi series line chart

    ----------------------------------------------------------------------------------------

    Item Name: Modern Admin - Clean Bootstrap 4 Dashboard HTML Template

    Author: PIXINVENT

    Author URL: http://www.themeforest.net/user/pixinvent

==========================================================================================*/



// Multi series line chart

// ------------------------------

$(window).on("load", function(){



    var ele = d3.select("#multi-series-line"),

    margin = {top: 20, right: 20, bottom: 30, left: 50},

    width = ele.node().getBoundingClientRect().width - margin.left - margin.right,

    height = 500 - margin.top - margin.bottom;



    var parseDate = d3.time.format("%Y%m%d").parse;



    var city;



    // Scales

    // ------------------------------



    var x = d3.time.scale()

        .range([0, width]);



    var y = d3.scale.linear()

        .range([height, 0]);



    // Color

    // var color = d3.scale.category10();

    var color = d3.scale.ordinal()

        .range(["#673AB7", "#00BCD4", "#FF5722" ]);

    // Axis

    // ------------------------------

    var xAxis = d3.svg.axis()

        .scale(x)

        .orient("bottom");



    var yAxis = d3.svg.axis()

        .scale(y)

        .orient("left");



    // Chart

    var line = d3.svg.line()

        .interpolate("basis")

        .x(function(d) { return x(d.date); })

        .y(function(d) { return y(d.temperature); });



    var container = ele.append("svg");



    var svg = container

        .attr("width", width + margin.left + margin.right)

        .attr("height", height + margin.top + margin.bottom)

      .append("g")

        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");







    // Load data

    // ------------------------------



    d3.tsv("../../../app-assets/data/d3/line/multi-series-line.tsv", function(error, data) {

        if (error) throw error;



        color.domain(d3.keys(data[0]).filter(function(key) { return key !== "date"; }));



        data.forEach(function(d) {

            d.date = parseDate(d.date);

        });



        var cities = color.domain().map(function(name) {

            return {

                name: name,

                values: data.map(function(d) {

                    return {date: d.date, temperature: +d[name]};

                })

            };

        });



        x.domain(d3.extent(data, function(d) { return d.date; }));



        y.domain([

            d3.min(cities, function(c) { return d3.min(c.values, function(v) { return v.temperature; }); }),

            d3.max(cities, function(c) { return d3.max(c.values, function(v) { return v.temperature; }); })

        ]);



        svg.append("g")

            .attr("class", "d3-axis d3-xaxis")

            .attr("transform", "translate(0," + height + ")")

            .call(xAxis);



        svg.append("g")

            .attr("class", "d3-axis d3-yaxis")

            .call(yAxis)

        .append("text")

            .attr("transform", "rotate(-90)")

            .attr("y", 6)

            .attr("dy", ".71em")

            .style("text-anchor", "end")

            .style("fill", "#666")

            .style("font-size", 12)

            .text("Temperature (ºF)");



        city = svg.selectAll(".city")

            .data(cities)

        .enter().append("g")

            .attr("class", "city");



        city.append("path")

            .attr("class", "d3-line")

            .attr("d", function(d) { return line(d.values); })

            .style("fill", "none")

            .style("stroke-width", 2)

            .style("stroke", function(d) { return color(d.name); });



        city.append("text")

            .datum(function(d) { return {name: d.name, value: d.values[d.values.length - 1]}; })

            .attr("transform", function(d) { return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")"; })

            .attr("x", 3)

            .attr("dy", ".35em")

            .text(function(d) { return d.name; });



    });



    function type(d) {

        d.date = formatDate.parse(d.date);

        d.close = +d.close;

        return d;

    }



    // Resize chart

    // ------------------------------



    // Call function on window resize

    $(window).on('resize', resize);



    // Call function on sidebar width change

    $('.menu-toggle').on('click', resize);



    // Resize function

    // ------------------------------

    function resize() {



        width = ele.node().getBoundingClientRect().width - margin.left - margin.right;



        // Main svg width

        container.attr("width", width + margin.left + margin.right);



        // Width of appended group

        svg.attr("width", width + margin.left + margin.right);





        // Axis

        // -------------------------

        x.range([0, width]);

        svg.selectAll('.d3-xaxis').call(xAxis);





        city.selectAll('.d3-line').attr("d", function(d) { return line(d.values); });

    }

});