/*=========================================================================================
    File Name: stacked-area.js
    Description: d3 stacked area chart
    ----------------------------------------------------------------------------------------
    Item Name: Modern Admin - Clean Bootstrap 4 Dashboard HTML Template
    Author: PIXINVENT
    Author URL: http://www.themeforest.net/user/pixinvent
==========================================================================================*/

// Stacked Area chart
// ------------------------------
$(window).on("load", function(){

    var ele = d3.select("#stacked-area"),
    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-%b-%d").parse,
    formatPercent = d3.format(".0%");

    var browser;

    // Scales
    // ------------------------------

    var x = d3.time.scale()
        .range([0, width]);

    var y = d3.scale.linear()
        .range([height, 0]);

    // Color
    var color = d3.scale.ordinal()
        .range(["#99B898", "#FECEA8", "#FF847C", "#E84A5F", "#2A363B"]);

    // Axis
    // ------------------------------
    var xAxis = d3.svg.axis()
        .scale(x)
        .orient("bottom");

    var yAxis = d3.svg.axis()
        .scale(y)
        .orient("left")
        .tickFormat(formatPercent);

    // Chart
    var area = d3.svg.area()
        .x(function(d) { return x(d.date); })
        .y0(function(d) { return y(d.y0); })
        .y1(function(d) { return y(d.y0 + d.y); });

    // Stack
    var stack = d3.layout.stack()
        .values(function(d) { return d.values; });

    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/stacked-area.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 browsers = stack(color.domain().map(function(name) {
            return {
                name: name,
                values: data.map(function(d) {
                    return {date: d.date, y: d[name] / 100};
                })
            };
        }));

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

        browser = svg.selectAll(".browser")
            .data(browsers)
        .enter().append("g")
            .attr("class", "browser");

        browser.append("path")
            .attr("class", "d3-area")
            .attr("d", function(d) { return area(d.values); })
            .style("fill", function(d) { return color(d.name); });

        browser.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.y0 + d.value.y / 2) + ")"; })
            .attr("x", -6)
            .attr("dy", ".35em")
            .style("fill", "#666")
            .style("font-size", 12)
            .text(function(d) { return d.name; });

        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);
    });

    // 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);


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