'use strict';

exports.__esModule = true;

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
    return typeof obj;
} : function (obj) {
    return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
};

var _ariaUtils = require('./aria-utils');

var _ariaUtils2 = _interopRequireDefault(_ariaUtils);

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

/**
 * @constructor
 * @desc Dialog object providing modal focus management.
 *
 * Assumptions: The element serving as the dialog container is present in the
 * DOM and hidden. The dialog container has role='dialog'.
 *
 * @param dialogId
 *          The ID of the element serving as the dialog container.
 * @param focusAfterClosed
 *          Either the DOM node or the ID of the DOM node to focus when the
 *          dialog closes.
 * @param focusFirst
 *          Optional parameter containing either the DOM node or the ID of the
 *          DOM node to focus when the dialog opens. If not specified, the
 *          first focusable element in the dialog will receive focus.
 */
var aria = aria || {};
var tabEvent;

aria.Dialog = function (dialog, focusAfterClosed, focusFirst) {
    var _this = this;

    this.dialogNode = dialog;
    if (this.dialogNode === null || this.dialogNode.getAttribute('role') !== 'dialog') {
        throw new Error('Dialog() requires a DOM element with ARIA role of dialog.');
    }

    if (typeof focusAfterClosed === 'string') {
        this.focusAfterClosed = document.getElementById(focusAfterClosed);
    } else if ((typeof focusAfterClosed === 'undefined' ? 'undefined' : _typeof(focusAfterClosed)) === 'object') {
        this.focusAfterClosed = focusAfterClosed;
    } else {
        this.focusAfterClosed = null;
    }

    if (typeof focusFirst === 'string') {
        this.focusFirst = document.getElementById(focusFirst);
    } else if ((typeof focusFirst === 'undefined' ? 'undefined' : _typeof(focusFirst)) === 'object') {
        this.focusFirst = focusFirst;
    } else {
        this.focusFirst = null;
    }

    if (this.focusFirst) {
        this.focusFirst.focus();
    } else {
        _ariaUtils2.default.focusFirstDescendant(this.dialogNode);
    }

    this.lastFocus = document.activeElement;
    tabEvent = function tabEvent(e) {
        _this.trapFocus(e);
    };
    this.addListeners();
};

aria.Dialog.prototype.addListeners = function () {
    document.addEventListener('focus', tabEvent, true);
};

aria.Dialog.prototype.removeListeners = function () {
    document.removeEventListener('focus', tabEvent, true);
};

aria.Dialog.prototype.closeDialog = function () {
    var _this2 = this;

    this.removeListeners();
    if (this.focusAfterClosed) {
        setTimeout(function () {
            _this2.focusAfterClosed.focus();
        });
    }
};

aria.Dialog.prototype.trapFocus = function (event) {
    if (_ariaUtils2.default.IgnoreUtilFocusChanges) {
        return;
    }
    if (this.dialogNode.contains(event.target)) {
        this.lastFocus = event.target;
    } else {
        _ariaUtils2.default.focusFirstDescendant(this.dialogNode);
        if (this.lastFocus === document.activeElement) {
            _ariaUtils2.default.focusLastDescendant(this.dialogNode);
        }
        this.lastFocus = document.activeElement;
    }
};

exports.default = aria.Dialog;