/* *
 *
 *  Copyright (c) 2019-2019 Highsoft AS
 *
 *  Boost module: stripped-down renderer for higher performance
 *
 *  License: highcharts.com/license
 *
 * */

'use strict';

import H from '../../parts/Globals.js';
import '../../parts/Series.js';

import butils from './boost-utils.js';
import createAndAttachRenderer from './boost-attach.js';

var addEvent = H.addEvent,
    fireEvent = H.fireEvent,
    extend = H.extend,
    Series = H.Series,
    seriesTypes = H.seriesTypes,
    wrap = H.wrap,
    noop = function () {},
    eachAsync = butils.eachAsync,
    pointDrawHandler = butils.pointDrawHandler,
    allocateIfNotSeriesBoosting = butils.allocateIfNotSeriesBoosting,
    renderIfNotSeriesBoosting = butils.renderIfNotSeriesBoosting,
    shouldForceChartSeriesBoosting = butils.shouldForceChartSeriesBoosting,
    index;

/**
 * Initialize the boot module.
 *
 * @private
 */
function init() {
    H.extend(Series.prototype, {
        /**
         * @private
         * @function Highcharts.Series#renderCanvas
         */
        renderCanvas: function () {
            var series = this,
                options = series.options || {},
                renderer = false,
                chart = series.chart,
                xAxis = this.xAxis,
                yAxis = this.yAxis,
                xData = options.xData || series.processedXData,
                yData = options.yData || series.processedYData,
                rawData = options.data,
                xExtremes = xAxis.getExtremes(),
                xMin = xExtremes.min,
                xMax = xExtremes.max,
                yExtremes = yAxis.getExtremes(),
                yMin = yExtremes.min,
                yMax = yExtremes.max,
                pointTaken = {},
                lastClientX,
                sampling = !!series.sampling,
                points,
                enableMouseTracking = options.enableMouseTracking !== false,
                threshold = options.threshold,
                yBottom = yAxis.getThreshold(threshold),
                isRange = series.pointArrayMap &&
                    series.pointArrayMap.join(',') === 'low,high',
                isStacked = !!options.stacking,
                cropStart = series.cropStart || 0,
                requireSorting = series.requireSorting,
                useRaw = !xData,
                minVal,
                maxVal,
                minI,
                maxI,
                boostOptions,
                compareX = options.findNearestPointBy === 'x',

                xDataFull = (
                    this.xData ||
                    this.options.xData ||
                    this.processedXData ||
                    false
                ),

                addKDPoint = function (clientX, plotY, i) {

                    // We need to do ceil on the clientX to make things
                    // snap to pixel values. The renderer will frequently
                    // draw stuff on "sub-pixels".
                    clientX = Math.ceil(clientX);

                    // Shaves off about 60ms compared to repeated concatenation
                    index = compareX ? clientX : clientX + ',' + plotY;

                    // The k-d tree requires series points.
                    // Reduce the amount of points, since the time to build the
                    // tree increases exponentially.
                    if (enableMouseTracking && !pointTaken[index]) {
                        pointTaken[index] = true;

                        if (chart.inverted) {
                            clientX = xAxis.len - clientX;
                            plotY = yAxis.len - plotY;
                        }

                        points.push({
                            x: xDataFull ? xDataFull[cropStart + i] : false,
                            clientX: clientX,
                            plotX: clientX,
                            plotY: plotY,
                            i: cropStart + i
                        });
                    }
                };

            // Get or create the renderer
            renderer = createAndAttachRenderer(chart, series);

            chart.isBoosting = true;

            boostOptions = renderer.settings;

            if (!this.visible) {
                return;
            }

            // If we are zooming out from SVG mode, destroy the graphics
            if (this.points || this.graph) {

                this.animate = null;
                this.destroyGraphics();
            }

            // If we're rendering per. series we should create the marker groups
            // as usual.
            if (!chart.isChartSeriesBoosting()) {
                // If all series were boosting, but are not anymore
                // restore private markerGroup
                if (this.markerGroup === chart.markerGroup) {
                    this.markerGroup = undefined;
                }

                this.markerGroup = series.plotGroup(
                    'markerGroup',
                    'markers',
                    true,
                    1,
                    chart.seriesGroup
                );
            } else {
                // If series has a private markeGroup, remove that
                // and use common markerGroup
                if (
                    this.markerGroup &&
                    this.markerGroup !== chart.markerGroup
                ) {
                    this.markerGroup.destroy();
                }
                // Use a single group for the markers
                this.markerGroup = chart.markerGroup;

                // When switching from chart boosting mode, destroy redundant
                // series boosting targets
                if (this.renderTarget) {
                    this.renderTarget = this.renderTarget.destroy();
                }
            }

            points = this.points = [];

            // Do not start building while drawing
            series.buildKDTree = noop;

            if (renderer) {
                allocateIfNotSeriesBoosting(renderer, this);
                renderer.pushSeries(series);
                // Perform the actual renderer if we're on series level
                renderIfNotSeriesBoosting(renderer, this, chart);
            }

            /* This builds the KD-tree */
            function processPoint(d, i) {
                var x,
                    y,
                    clientX,
                    plotY,
                    isNull,
                    low = false,
                    chartDestroyed = typeof chart.index === 'undefined',
                    isYInside = true;

                if (!chartDestroyed) {
                    if (useRaw) {
                        x = d[0];
                        y = d[1];
                    } else {
                        x = d;
                        y = yData[i];
                    }

                    // Resolve low and high for range series
                    if (isRange) {
                        if (useRaw) {
                            y = d.slice(1, 3);
                        }
                        low = y[0];
                        y = y[1];
                    } else if (isStacked) {
                        x = d.x;
                        y = d.stackY;
                        low = y - d.y;
                    }

                    isNull = y === null;

                    // Optimize for scatter zooming
                    if (!requireSorting) {
                        isYInside = y >= yMin && y <= yMax;
                    }

                    if (!isNull && x >= xMin && x <= xMax && isYInside) {

                        clientX = xAxis.toPixels(x, true);

                        if (sampling) {
                            if (minI === undefined || clientX === lastClientX) {
                                if (!isRange) {
                                    low = y;
                                }
                                if (maxI === undefined || y > maxVal) {
                                    maxVal = y;
                                    maxI = i;
                                }
                                if (minI === undefined || low < minVal) {
                                    minVal = low;
                                    minI = i;
                                }

                            }
                            // Add points and reset
                            if (clientX !== lastClientX) {
                                if (minI !== undefined) { // maxI is number too
                                    plotY = yAxis.toPixels(maxVal, true);
                                    yBottom = yAxis.toPixels(minVal, true);

                                    addKDPoint(clientX, plotY, maxI);
                                    if (yBottom !== plotY) {
                                        addKDPoint(clientX, yBottom, minI);
                                    }
                                }

                                minI = maxI = undefined;
                                lastClientX = clientX;
                            }
                        } else {
                            plotY = Math.ceil(yAxis.toPixels(y, true));
                            addKDPoint(clientX, plotY, i);
                        }
                    }
                }

                return !chartDestroyed;
            }

            function doneProcessing() {
                fireEvent(series, 'renderedCanvas');

                // Go back to prototype, ready to build
                delete series.buildKDTree;
                series.buildKDTree();

                if (boostOptions.debug.timeKDTree) {
                    console.timeEnd('kd tree building'); // eslint-disable-line no-console
                }
            }

            // Loop over the points to build the k-d tree - skip this if
            // exporting
            if (!chart.renderer.forExport) {
                if (boostOptions.debug.timeKDTree) {
                    console.time('kd tree building'); // eslint-disable-line no-console
                }

                eachAsync(
                    isStacked ? series.data : (xData || rawData),
                    processPoint,
                    doneProcessing
                );
            }
        }
    });

    /*
     * We need to handle heatmaps separatly, since we can't perform the
     * size/color calculations in the shader easily.
     *
     * This likely needs future optimization.
     */
    ['heatmap', 'treemap'].forEach(
        function (t) {
            if (seriesTypes[t]) {
                wrap(seriesTypes[t].prototype, 'drawPoints', pointDrawHandler);
            }
        }
    );

    if (seriesTypes.bubble) {
        // By default, the bubble series does not use the KD-tree, so force it
        // to.
        delete seriesTypes.bubble.prototype.buildKDTree;
        // seriesTypes.bubble.prototype.directTouch = false;

        // Needed for markers to work correctly
        wrap(
            seriesTypes.bubble.prototype,
            'markerAttribs',
            function (proceed) {
                if (this.isSeriesBoosting) {
                    return false;
                }
                return proceed.apply(this, [].slice.call(arguments, 1));
            }
        );
    }

    seriesTypes.scatter.prototype.fill = true;

    extend(seriesTypes.area.prototype, {
        fill: true,
        fillOpacity: true,
        sampling: true
    });

    extend(seriesTypes.column.prototype, {
        fill: true,
        sampling: true
    });

    // Take care of the canvas blitting
    H.Chart.prototype.callbacks.push(function (chart) {

        /* Convert chart-level canvas to image */
        function canvasToSVG() {
            if (chart.ogl && chart.isChartSeriesBoosting()) {
                chart.ogl.render(chart);
            }
        }

        /* Clear chart-level canvas */
        function preRender() {
            // Reset force state
            chart.boostForceChartBoost = undefined;
            chart.boostForceChartBoost = shouldForceChartSeriesBoosting(chart);
            chart.isBoosting = false;

            if (!chart.isChartSeriesBoosting() && chart.didBoost) {
                chart.didBoost = false;
            }

            // Clear the canvas
            if (chart.boostClear) {
                chart.boostClear();
            }

            if (chart.canvas && chart.ogl && chart.isChartSeriesBoosting()) {
                chart.didBoost = true;

                // Allocate
                chart.ogl.allocateBuffer(chart);
            }

            // see #6518 + #6739
            if (
                chart.markerGroup &&
                chart.xAxis &&
                chart.xAxis.length > 0 &&
                chart.yAxis &&
                chart.yAxis.length > 0
            ) {
                chart.markerGroup.translate(
                    chart.xAxis[0].pos,
                    chart.yAxis[0].pos
                );
            }
        }

        addEvent(chart, 'predraw', preRender);
        addEvent(chart, 'render', canvasToSVG);

        // addEvent(chart, 'zoom', function () {
        //     chart.boostForceChartBoost =
        //         shouldForceChartSeriesBoosting(chart);
        // });

    });
}

export default init;
