/* *
 * Variable Pie module for Highcharts
 *
 * (c) 2010-2017 Grzegorz Blachliński
 *
 * License: www.highcharts.com/license
 */

'use strict';

import H from '../parts/Globals.js';
import '../parts/Utilities.js';
import '../parts/Options.js';

var pick = H.pick,
    arrayMin = H.arrayMin,
    arrayMax = H.arrayMax,
    seriesType = H.seriesType,
    pieProto = H.seriesTypes.pie.prototype;

/**
 * The variablepie series type.
 *
 * @private
 * @class
 * @name Highcharts.seriesTypes.variablepie
 *
 * @augments Highcharts.Series
 */
seriesType(
    'variablepie',
    'pie',
    /**
     * A variable pie series is a two dimensional series type, where each point
     * renders an Y and Z value.  Each point is drawn as a pie slice where the
     * size (arc) of the slice relates to the Y value and the radius of pie
     * slice relates to the Z value. Requires `highcharts-more.js`.
     *
     * @sample {highcharts} highcharts/demo/variable-radius-pie/
     *         Variable-radius pie chart
     *
     * @extends      plotOptions.pie
     * @since        6.0.0
     * @product      highcharts
     * @optionparent plotOptions.variablepie
     */
    {
        /**
         * The minimum size of the points' radius related to chart's `plotArea`.
         * If a number is set, it applies in pixels.
         *
         * @sample {highcharts} highcharts/variable-radius-pie/min-max-point-size/
         *         Example of minPointSize and maxPointSize
         * @sample {highcharts} highcharts/variable-radius-pie/min-point-size-100/
         *         minPointSize set to 100
         *
         * @type  {number|string}
         * @since 6.0.0
         */
        minPointSize: '10%',
        /**
         * The maximum size of the points' radius related to chart's `plotArea`.
         * If a number is set, it applies in pixels.
         *
         * @sample {highcharts} highcharts/variable-radius-pie/min-max-point-size/
         *         Example of minPointSize and maxPointSize
         *
         * @type  {number|string}
         * @since 6.0.0
         */
        maxPointSize: '100%',
        /**
         * The minimum possible z value for the point's radius calculation. If
         * the point's Z value is smaller than zMin, the slice will be drawn
         * according to the zMin value.
         *
         * @sample {highcharts} highcharts/variable-radius-pie/zmin-5/
         *         zMin set to 5, smaller z values are treated as 5
         * @sample {highcharts} highcharts/variable-radius-pie/zmin-zmax/
         *         Series limited by both zMin and zMax
         *
         * @type  {number}
         * @since 6.0.0
         */
        zMin: undefined,
        /**
         * The maximum possible z value for the point's radius calculation. If
         * the point's Z value is bigger than zMax, the slice will be drawn
         * according to the zMax value
         *
         * @sample {highcharts} highcharts/variable-radius-pie/zmin-zmax/
         *         Series limited by both zMin and zMax
         *
         * @type  {number}
         * @since 6.0.0
         */
        zMax: undefined,
        /**
         * Whether the pie slice's value should be represented by the area or
         * the radius of the slice. Can be either `area` or `radius`. The
         * default, `area`, corresponds best to the human perception of the size
         * of each pie slice.
         *
         * @sample {highcharts} highcharts/variable-radius-pie/sizeby/
         *         Difference between area and radius sizeBy
         *
         * @since      6.0.0
         * @validvalue ["area", "radius"]
         */
        sizeBy: 'area',

        tooltip: {
            pointFormat: '<span style="color:{point.color}">\u25CF</span> {series.name}<br/>Value: {point.y}<br/>Size: {point.z}<br/>'
        }
    }, {
        pointArrayMap: ['y', 'z'],
        parallelArrays: ['x', 'y', 'z'],

        // It is needed to null series.center on chart redraw. Probably good
        // idea will be to add this option in directly in pie series.
        redraw: function () {
            this.center = null;
            pieProto.redraw.call(this, arguments);
        },

        // For arrayMin and arrayMax calculations array shouldn't have
        // null/undefined/string values. In this case it is needed to check if
        // points Z value is a Number.
        zValEval: function (zVal) {
            if (typeof zVal === 'number' && !isNaN(zVal)) {
                return true;
            }
            return null;
        },

        // Before standard translate method for pie chart it is needed to
        // calculate min/max radius of each pie slice based on its Z value.
        calculateExtremes: function () {
            var series = this,
                chart = series.chart,
                plotWidth = chart.plotWidth,
                plotHeight = chart.plotHeight,
                seriesOptions = series.options,
                slicingRoom = 2 * (seriesOptions.slicedOffset || 0),
                zMin,
                zMax,
                zData = series.zData,
                smallestSize = Math.min(plotWidth, plotHeight) - slicingRoom,
                extremes = {}, // Min and max size of pie slice.
                // In pie charts size of a pie is changed to make space for
                // dataLabels, then series.center is changing.
                positions = series.center || series.getCenter();

            ['minPointSize', 'maxPointSize'].forEach(function (prop) {
                var length = seriesOptions[prop],
                    isPercent = /%$/.test(length);

                length = parseInt(length, 10);
                extremes[prop] = isPercent ?
                    smallestSize * length / 100 :
                    length * 2; // Because it should be radius, not diameter.
            });

            series.minPxSize = positions[3] + extremes.minPointSize;
            series.maxPxSize = Math.max(
                Math.min(positions[2], extremes.maxPointSize),
                positions[3] + extremes.minPointSize
            );

            if (zData.length) {
                zMin = pick(
                    seriesOptions.zMin,
                    arrayMin(zData.filter(series.zValEval))
                );
                zMax = pick(
                    seriesOptions.zMax,
                    arrayMax(zData.filter(series.zValEval))
                );
                this.getRadii(zMin, zMax, series.minPxSize, series.maxPxSize);
            }
        },

        /**
         * Finding radius of series points based on their Z value and min/max Z
         * value for all series.
         *
         * @private
         * @function Highcharts.Series#getRadii
         *
         * @param {number} zMin
         *        Min threshold for Z value. If point's Z value is smaller that
         *        zMin, point will have the smallest possible radius.
         *
         * @param {number} zMax
         *        Max threshold for Z value. If point's Z value is bigger that
         *        zMax, point will have the biggest possible radius.
         *
         * @param {number} minSize
         *        Minimal pixel size possible for radius.
         *
         * @param {numbner} maxSize
         *        Minimal pixel size possible for radius.
         */
        getRadii: function (zMin, zMax, minSize, maxSize) {
            var i = 0,
                pos,
                zData = this.zData,
                len = zData.length,
                radii = [],
                options = this.options,
                sizeByArea = options.sizeBy !== 'radius',
                zRange = zMax - zMin,
                value,
                radius;


            // Calculate radius for all pie slice's based on their Z values
            for (i; i < len; i++) {
                // if zData[i] is null/undefined/string we need to take zMin for
                // smallest radius.
                value = this.zValEval(zData[i]) ? zData[i] : zMin;

                if (value <= zMin) {
                    radius = minSize / 2;
                } else if (value >= zMax) {
                    radius = maxSize / 2;
                } else {
                    // Relative size, a number between 0 and 1
                    pos = zRange > 0 ? (value - zMin) / zRange : 0.5;

                    if (sizeByArea) {
                        pos = Math.sqrt(pos);
                    }

                    radius = Math.ceil(minSize + pos * (maxSize - minSize)) / 2;
                }
                radii.push(radius);
            }
            this.radii = radii;
        },


        // Extend translate by updating radius for each pie slice instead of
        // using one global radius.
        translate: function (positions) {

            this.generatePoints();

            var series = this,
                cumulative = 0,
                precision = 1000, // issue #172
                options = series.options,
                slicedOffset = options.slicedOffset,
                connectorOffset = slicedOffset + (options.borderWidth || 0),
                finalConnectorOffset,
                start,
                end,
                angle,
                startAngle = options.startAngle || 0,
                startAngleRad = Math.PI / 180 * (startAngle - 90),
                endAngleRad = Math.PI / 180 * (pick(
                    options.endAngle,
                    startAngle + 360
                ) - 90),
                circ = endAngleRad - startAngleRad, // 2 * Math.PI,
                points = series.points,
                // the x component of the radius vector for a given point
                radiusX,
                radiusY,
                labelDistance = options.dataLabels.distance,
                ignoreHiddenPoint = options.ignoreHiddenPoint,
                i,
                len = points.length,
                point,
                pointRadii,
                pointRadiusX,
                pointRadiusY;

            series.startAngleRad = startAngleRad;
            series.endAngleRad = endAngleRad;
            // Use calculateExtremes to get series.radii array.
            series.calculateExtremes();

            // Get positions - either an integer or a percentage string must be
            // given. If positions are passed as a parameter, we're in a
            // recursive loop for adjusting space for data labels.
            if (!positions) {
                series.center = positions = series.getCenter();
            }

            // Calculate the geometry for each point
            for (i = 0; i < len; i++) {

                point = points[i];
                pointRadii = series.radii[i];

                // Used for distance calculation for specific point.
                point.labelDistance = pick(
                    point.options.dataLabels &&
                    point.options.dataLabels.distance,
                    labelDistance
                );

                // Saved for later dataLabels distance calculation.
                series.maxLabelDistance = Math.max(
                    series.maxLabelDistance || 0,
                    point.labelDistance
                );

                // set start and end angle
                start = startAngleRad + (cumulative * circ);
                if (!ignoreHiddenPoint || point.visible) {
                    cumulative += point.percentage / 100;
                }
                end = startAngleRad + (cumulative * circ);

                // set the shape
                point.shapeType = 'arc';
                point.shapeArgs = {
                    x: positions[0],
                    y: positions[1],
                    r: pointRadii,
                    innerR: positions[3] / 2,
                    start: Math.round(start * precision) / precision,
                    end: Math.round(end * precision) / precision
                };

                // The angle must stay within -90 and 270 (#2645)
                angle = (end + start) / 2;
                if (angle > 1.5 * Math.PI) {
                    angle -= 2 * Math.PI;
                } else if (angle < -Math.PI / 2) {
                    angle += 2 * Math.PI;
                }

                // Center for the sliced out slice
                point.slicedTranslation = {
                    translateX: Math.round(Math.cos(angle) * slicedOffset),
                    translateY: Math.round(Math.sin(angle) * slicedOffset)
                };

                // set the anchor point for tooltips
                radiusX = Math.cos(angle) * positions[2] / 2;
                radiusY = Math.sin(angle) * positions[2] / 2;
                pointRadiusX = Math.cos(angle) * pointRadii;
                pointRadiusY = Math.sin(angle) * pointRadii;
                point.tooltipPos = [
                    positions[0] + radiusX * 0.7,
                    positions[1] + radiusY * 0.7
                ];

                point.half = angle < -Math.PI / 2 || angle > Math.PI / 2 ?
                    1 :
                    0;
                point.angle = angle;

                // Set the anchor point for data labels. Use point.labelDistance
                // instead of labelDistance // #1174
                // finalConnectorOffset - not override connectorOffset value.
                finalConnectorOffset = Math.min(
                    connectorOffset,
                    point.labelDistance / 5
                ); // #1678

                point.labelPosition = {
                    natural: {
                        // initial position of the data label - it's utilized
                        // for finding the final position for the label
                        x: positions[0] + pointRadiusX +
                            Math.cos(angle) * point.labelDistance,
                        y: positions[1] + pointRadiusY +
                            Math.sin(angle) * point.labelDistance
                    },
                    'final': {
                        // used for generating connector path -
                        // initialized later in drawDataLabels function
                        // x: undefined,
                        // y: undefined
                    },
                    // left - pie on the left side of the data label
                    // right - pie on the right side of the data label
                    alignment: point.half ? 'right' : 'left',
                    connectorPosition: {
                        breakAt: { // used in connectorShapes.fixedOffset
                            x: positions[0] + pointRadiusX +
                                Math.cos(angle) * finalConnectorOffset,
                            y: positions[1] + pointRadiusY +
                                Math.sin(angle) * finalConnectorOffset
                        },
                        touchingSliceAt: { // middle of the arc
                            x: positions[0] + pointRadiusX,
                            y: positions[1] + pointRadiusY
                        }
                    }
                };

            }
        }
    }
);

/**
 * A `variablepie` series. If the [type](#series.variablepie.type) option is not
 * specified, it is inherited from [chart.type](#chart.type).
 *
 * @extends   series,plotOptions.variablepie
 * @excluding dataParser, dataURL, stack, xAxis, yAxis
 * @product   highcharts
 * @apioption series.variablepie
 */

/**
 * An array of data points for the series. For the `variablepie` series type,
 * points can be given in the following ways:
 *
 * 1. An array of arrays with 2 values. In this case, the numerical values will
 *    be interpreted as `y, z` options. Example:
 *    ```js
 *    data: [
 *        [40, 75],
 *        [50, 50],
 *        [60, 40]
 *    ]
 *    ```
 *
 * 2. An array of objects with named values. The following snippet shows only a
 *    few settings, see the complete options set below. If the total number of
 *    data points exceeds the series'
 *    [turboThreshold](#series.variablepie.turboThreshold), this option is not
 *    available.
 *    ```js
 *    data: [{
 *        y: 1,
 *        z: 4,
 *        name: "Point2",
 *        color: "#00FF00"
 *    }, {
 *        y: 7,
 *        z: 10,
 *        name: "Point1",
 *        color: "#FF00FF"
 *    }]
 *    ```
 *
 * @sample {highcharts} highcharts/series/data-array-of-arrays/
 *         Arrays of numeric x and y
 * @sample {highcharts} highcharts/series/data-array-of-arrays-datetime/
 *         Arrays of datetime x and y
 * @sample {highcharts} highcharts/series/data-array-of-name-value/
 *         Arrays of point.name and y
 * @sample {highcharts} highcharts/series/data-array-of-objects/
 *         Config objects
 *
 * @type      {Array<Array<(number|string),number>|*>}
 * @extends   series.pie.data
 * @excluding marker, x
 * @product   highcharts
 * @apioption series.variablepie.data
 */