/* *
 *
 *  (c) 2009-2019 Øystein Moseng
 *
 *  Accessibility component for chart zoom.
 *
 *  License: www.highcharts.com/license
 *
 * */

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _Globals = require('../../../parts/Globals.js');

var _Globals2 = _interopRequireDefault(_Globals);

var _AccessibilityComponent = require('../AccessibilityComponent.js');

var _AccessibilityComponent2 = _interopRequireDefault(_AccessibilityComponent);

var _KeyboardNavigationHandler = require('../KeyboardNavigationHandler.js');

var _KeyboardNavigationHandler2 = _interopRequireDefault(_KeyboardNavigationHandler);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Pan along axis in a direction (1 or -1), optionally with a defined
 * granularity (number of steps it takes to walk across current view)
 *
 * @private
 * @function Highcharts.Axis#panStep
 *
 * @param {number} direction
 * @param {number} [granularity]
 */
_Globals2.default.Axis.prototype.panStep = function (direction, granularity) {
    var gran = granularity || 3,
        extremes = this.getExtremes(),
        step = (extremes.max - extremes.min) / gran * direction,
        newMax = extremes.max + step,
        newMin = extremes.min + step,
        size = newMax - newMin;

    if (direction < 0 && newMin < extremes.dataMin) {
        newMin = extremes.dataMin;
        newMax = newMin + size;
    } else if (direction > 0 && newMax > extremes.dataMax) {
        newMax = extremes.dataMax;
        newMin = newMax - size;
    }
    this.setExtremes(newMin, newMax);
};

/**
 * The ZoomComponent class
 *
 * @private
 * @class
 * @name Highcharts.ZoomComponent
 * @param {Highcharts.Chart} chart
 *        Chart object
 */
var ZoomComponent = function ZoomComponent(chart) {
    this.initBase(chart);
    this.init();
};
ZoomComponent.prototype = new _AccessibilityComponent2.default();
_Globals2.default.extend(ZoomComponent.prototype, /** @lends Highcharts.ZoomComponent */{

    /**
     * Initialize the component
     */
    init: function init() {
        var component = this,
            chart = this.chart;
        ['afterShowResetZoom', 'afterDrilldown', 'drillupall'].forEach(function (eventType) {
            component.addEvent(chart, eventType, function () {
                component.updateProxyOverlays();
            });
        });
    },

    /**
     * Called when chart is updated
     */
    onChartUpdate: function onChartUpdate() {
        var chart = this.chart,
            component = this;

        // Make map zoom buttons accessible
        if (chart.mapNavButtons) {
            chart.mapNavButtons.forEach(function (button, i) {
                component.unhideElementFromScreenReaders(button.element);
                button.element.setAttribute('tabindex', -1);
                button.element.setAttribute('role', 'button');
                button.element.setAttribute('aria-label', chart.langFormat('accessibility.mapZoom' + (i ? 'Out' : 'In'), { chart: chart }));
            });
        }
    },

    /**
     * Update the proxy overlays on every new render to ensure positions are
     * correct.
     */
    onChartRender: function onChartRender() {
        this.updateProxyOverlays();
    },

    /**
     * Update proxy overlays, recreating the buttons.
     */
    updateProxyOverlays: function updateProxyOverlays() {
        var component = this,
            chart = this.chart,
            proxyButton = function proxyButton(buttonEl, buttonProp, groupProp, label) {
            component.removeElement(component[groupProp]);
            component[groupProp] = component.addProxyGroup();
            component[buttonProp] = component.createProxyButton(buttonEl, component[groupProp], {
                'aria-label': label,
                tabindex: -1
            });
        };

        // Always start with a clean slate
        component.removeElement(component.drillUpProxyGroup);
        component.removeElement(component.resetZoomProxyGroup);

        if (chart.resetZoomButton) {
            proxyButton(chart.resetZoomButton, 'resetZoomProxyButton', 'resetZoomProxyGroup', chart.langFormat('accessibility.resetZoomButton', { chart: chart }));
        }

        if (chart.drillUpButton) {
            proxyButton(chart.drillUpButton, 'drillUpProxyButton', 'drillUpProxyGroup', chart.langFormat('accessibility.drillUpButton', {
                chart: chart,
                buttonText: chart.getDrilldownBackText()
            }));
        }
    },

    /**
     * Get keyboard navigation handler for map zoom.
     * @private
     * @return {Highcharts.KeyboardNavigationHandler} The module object
     */
    getMapZoomNavigation: function getMapZoomNavigation() {
        var keys = this.keyCodes,
            chart = this.chart,
            component = this;

        return new _KeyboardNavigationHandler2.default(chart, {
            keyCodeMap: [
            // Arrow keys
            [[keys.up, keys.down, keys.left, keys.right], function (keyCode) {
                chart[keyCode === keys.up || keyCode === keys.down ? 'yAxis' : 'xAxis'][0].panStep(keyCode === keys.left || keyCode === keys.up ? -1 : 1);
                return this.response.success;
            }],

            // Tabs
            [[keys.tab], function (keyCode, e) {
                var button;

                // Deselect old
                chart.mapNavButtons[component.focusedMapNavButtonIx].setState(0);

                // Trying to go somewhere we can't?
                if (e.shiftKey && !component.focusedMapNavButtonIx || !e.shiftKey && component.focusedMapNavButtonIx) {
                    chart.mapZoom(); // Reset zoom
                    // Nowhere to go, go to prev/next module
                    return this.response[e.shiftKey ? 'prev' : 'next'];
                }

                // Select other button
                component.focusedMapNavButtonIx += e.shiftKey ? -1 : 1;
                button = chart.mapNavButtons[component.focusedMapNavButtonIx];
                chart.setFocusToElement(button.box, button.element);
                button.setState(2);

                return this.response.success;
            }],

            // Press button
            [[keys.space, keys.enter], function () {
                component.fakeClickEvent(chart.mapNavButtons[component.focusedMapNavButtonIx].element);
                return this.response.success;
            }]],

            // Only run this module if we have map zoom on the chart
            validate: function validate() {
                return chart.mapZoom && chart.mapNavButtons && chart.mapNavButtons.length === 2;
            },

            // Make zoom buttons do their magic
            init: function init(direction) {
                var zoomIn = chart.mapNavButtons[0],
                    zoomOut = chart.mapNavButtons[1],
                    initialButton = direction > 0 ? zoomIn : zoomOut;
                chart.setFocusToElement(initialButton.box, initialButton.element);
                initialButton.setState(2);
                component.focusedMapNavButtonIx = direction > 0 ? 0 : 1;
            }
        });
    },

    /**
     * Get keyboard navigation handler for a simple chart button. Provide the
     * button reference for the chart, and a function to call on click.
     *
     * @private
     * @param {string} buttonProp The property on chart referencing the button.
     * @return {Highcharts.KeyboardNavigationHandler} The module object
     */
    simpleButtonNavigation: function simpleButtonNavigation(buttonProp, proxyProp, onClick) {
        var keys = this.keyCodes,
            component = this,
            chart = this.chart;

        return new _KeyboardNavigationHandler2.default(chart, {
            keyCodeMap: [
            // Arrow/tab just move
            [[keys.tab, keys.up, keys.down, keys.left, keys.right], function (keyCode, e) {
                return this.response[keyCode === this.tab && e.shiftKey || keyCode === keys.left || keyCode === keys.up ? 'prev' : 'next'];
            }],

            // Select to click
            [[keys.space, keys.enter], function () {
                onClick(chart);
                return this.response.success;
            }]],

            // Only run if we have the button
            validate: function validate() {
                return chart[buttonProp] && chart[buttonProp].box && component[proxyProp];
            },

            // Focus button initially
            init: function init() {
                chart.setFocusToElement(chart[buttonProp].box, component[proxyProp]);
            }
        });
    },

    /**
     * Get keyboard navigation handlers for this component.
     * @return {Array<Highcharts.KeyboardNavigationHandler>}
     *         List of module objects
     */
    getKeyboardNavigation: function getKeyboardNavigation() {
        return [this.simpleButtonNavigation('resetZoomButton', 'resetZoomProxyButton', function (chart) {
            chart.zoomOut();
        }), this.simpleButtonNavigation('drillUpButton', 'drillUpProxyButton', function (chart) {
            chart.drillUp();
        }), this.getMapZoomNavigation()];
    }

});

exports.default = ZoomComponent;