/*! @preserve
 * bootbox.js
 * version: 5.4.0
 * author: Nick Payne <nick@kurai.co.uk>
 * license: MIT
 * http://bootboxjs.com/
 */
(function (root, factory) {
  'use strict';
  if (typeof define === 'function' && define.amd) {
    // AMD
    define(['jquery'], factory);
  } else if (typeof exports === 'object') {
    // Node, CommonJS-like
    module.exports = factory(require('jquery'));
  } else {
    // Browser globals (root is window)
    root.bootbox = factory(root.jQuery);
  }
}(this, function init($, undefined) {
  'use strict';

  //  Polyfills Object.keys, if necessary.
  //  @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys
  if (!Object.keys) {
    Object.keys = (function () {
      var hasOwnProperty = Object.prototype.hasOwnProperty,
        hasDontEnumBug = !({ toString: null }).propertyIsEnumerable('toString'),
        dontEnums = [
          'toString',
          'toLocaleString',
          'valueOf',
          'hasOwnProperty',
          'isPrototypeOf',
          'propertyIsEnumerable',
          'constructor'
        ],
        dontEnumsLength = dontEnums.length;

      return function (obj) {
        if (typeof obj !== 'function' && (typeof obj !== 'object' || obj === null)) {
          throw new TypeError('Object.keys called on non-object');
        }

        var result = [], prop, i;

        for (prop in obj) {
          if (hasOwnProperty.call(obj, prop)) {
            result.push(prop);
          }
        }

        if (hasDontEnumBug) {
          for (i = 0; i < dontEnumsLength; i++) {
            if (hasOwnProperty.call(obj, dontEnums[i])) {
              result.push(dontEnums[i]);
            }
          }
        }

        return result;
      };
    }());
  }

  var exports = {};

  var VERSION = '5.0.0';
  exports.VERSION = VERSION;

  var locales = {
    en : {
      OK      : 'OK',
      CANCEL  : 'Cancel',
      CONFIRM : 'OK'
    }
  };

  var templates = {
    dialog:
    '<div class="bootbox modal" tabindex="-1" role="dialog" aria-hidden="true">' +
    '<div class="modal-dialog">' +
    '<div class="modal-content">' +
    '<div class="modal-body"><div class="bootbox-body"></div></div>' +
    '</div>' +
    '</div>' +
    '</div>',
    header:
    '<div class="modal-header">' +
    '<h5 class="modal-title"></h5>' +
    '</div>',
    footer:
    '<div class="modal-footer"></div>',
    closeButton:
    '<button type="button" class="bootbox-close-button close" aria-hidden="true">&times;</button>',
    form:
    '<form class="bootbox-form"></form>',
    button:
    '<button type="button" class="btn"></button>',
    option:
    '<option></option>',
    promptMessage:
    '<div class="bootbox-prompt-message"></div>',
    inputs: {
      text:
      '<input class="bootbox-input bootbox-input-text form-control" autocomplete="off" type="text" />',
      textarea:
      '<textarea class="bootbox-input bootbox-input-textarea form-control"></textarea>',
      email:
      '<input class="bootbox-input bootbox-input-email form-control" autocomplete="off" type="email" />',
      select:
      '<select class="bootbox-input bootbox-input-select form-control"></select>',
      checkbox:
      '<div class="form-check checkbox"><label class="form-check-label"><input class="form-check-input bootbox-input bootbox-input-checkbox" type="checkbox" /></label></div>',
      radio:
      '<div class="form-check radio"><label class="form-check-label"><input class="form-check-input bootbox-input bootbox-input-radio" type="radio" name="bootbox-radio" /></label></div>',
      date:
      '<input class="bootbox-input bootbox-input-date form-control" autocomplete="off" type="date" />',
      time:
      '<input class="bootbox-input bootbox-input-time form-control" autocomplete="off" type="time" />',
      number:
      '<input class="bootbox-input bootbox-input-number form-control" autocomplete="off" type="number" />',
      password:
      '<input class="bootbox-input bootbox-input-password form-control" autocomplete="off" type="password" />',
      range:
      '<input class="bootbox-input bootbox-input-range form-control-range" autocomplete="off" type="range" />'
    }
  };


  var defaults = {
    // default language
    locale: 'en',
    // show backdrop or not. Default to static so user has to interact with dialog
    backdrop: 'static',
    // animate the modal in/out
    animate: true,
    // additional class string applied to the top level dialog
    className: null,
    // whether or not to include a close button
    closeButton: true,
    // show the dialog immediately by default
    show: true,
    // dialog container
    container: 'body',
    // default value (used by the prompt helper)
    value: '',
    // default input type (used by the prompt helper)
    inputType: 'text',
    // switch button order from cancel/confirm (default) to confirm/cancel
    swapButtonOrder: false,
    // center modal vertically in page
    centerVertical: false,
    // Append "multiple" property to the select when using the "prompt" helper
    multiple: false,
    // Automatically scroll modal content when height exceeds viewport height
    scrollable: false
  };


  // PUBLIC FUNCTIONS
  // *************************************************************************************************************

  // Return all currently registered locales, or a specific locale if "name" is defined
  exports.locales = function (name) {
    return name ? locales[name] : locales;
  };


  // Register localized strings for the OK, CONFIRM, and CANCEL buttons
  exports.addLocale = function (name, values) {
    $.each(['OK', 'CANCEL', 'CONFIRM'], function (_, v) {
      if (!values[v]) {
        throw new Error('Please supply a translation for "' + v + '"');
      }
    });

    locales[name] = {
      OK: values.OK,
      CANCEL: values.CANCEL,
      CONFIRM: values.CONFIRM
    };

    return exports;
  };


  // Remove a previously-registered locale
  exports.removeLocale = function (name) {
    if (name !== 'en') {
      delete locales[name];
    }
    else {
      throw new Error('"en" is used as the default and fallback locale and cannot be removed.');
    }

    return exports;
  };


  // Set the default locale
  exports.setLocale = function (name) {
    return exports.setDefaults('locale', name);
  };


  // Override default value(s) of Bootbox.
  exports.setDefaults = function () {
    var values = {};

    if (arguments.length === 2) {
      // allow passing of single key/value...
      values[arguments[0]] = arguments[1];
    } else {
      // ... and as an object too
      values = arguments[0];
    }

    $.extend(defaults, values);

    return exports;
  };


  // Hides all currently active Bootbox modals
  exports.hideAll = function () {
    $('.bootbox').modal('hide');

    return exports;
  };


  // Allows the base init() function to be overridden
  exports.init = function (_$) {
    return init(_$ || $);
  };


  // CORE HELPER FUNCTIONS
  // *************************************************************************************************************

  // Core dialog function
  exports.dialog = function (options) {
    if ($.fn.modal === undefined) {
      throw new Error(
        '"$.fn.modal" is not defined; please double check you have included ' +
        'the Bootstrap JavaScript library. See https://getbootstrap.com/docs/4.4/getting-started/javascript/ ' +
        'for more details.'
      );
    }

    options = sanitize(options);

    if ($.fn.modal.Constructor.VERSION) {
      options.fullBootstrapVersion = $.fn.modal.Constructor.VERSION;
      var i = options.fullBootstrapVersion.indexOf('.');
      options.bootstrap = options.fullBootstrapVersion.substring(0, i);
    }
    else {
      // Assuming version 2.3.2, as that was the last "supported" 2.x version
      options.bootstrap = '2';
      options.fullBootstrapVersion = '2.3.2';
      console.warn('Bootbox will *mostly* work with Bootstrap 2, but we do not officially support it. Please upgrade, if possible.');
    }

    var dialog = $(templates.dialog);
    var innerDialog = dialog.find('.modal-dialog');
    var body = dialog.find('.modal-body');
    var header = $(templates.header);
    var footer = $(templates.footer);
    var buttons = options.buttons;

    var callbacks = {
      onEscape: options.onEscape
    };

    body.find('.bootbox-body').html(options.message);

    // Only attempt to create buttons if at least one has 
    // been defined in the options object
    if (getKeyLength(options.buttons) > 0) {
      each(buttons, function (key, b) {
        var button = $(templates.button);
        button.data('bb-handler', key);
        button.addClass(b.className);

        switch (key) {
          case 'ok':
          case 'confirm':
            button.addClass('bootbox-accept');
            break;

          case 'cancel':
            button.addClass('bootbox-cancel');
            break;
        }

        button.html(b.label);
        footer.append(button);

        callbacks[key] = b.callback;
      });

      body.after(footer);
    }

    if (options.animate === true) {
      dialog.addClass('fade');
    }

    if (options.className) {
      dialog.addClass(options.className);
    }

    if (options.size) {
      // Requires Bootstrap 3.1.0 or higher
      if (options.fullBootstrapVersion.substring(0, 3) < '3.1') {
        console.warn('"size" requires Bootstrap 3.1.0 or higher. You appear to be using ' + options.fullBootstrapVersion + '. Please upgrade to use this option.');
      }

      switch (options.size) {
        case 'small':
        case 'sm':
          innerDialog.addClass('modal-sm');
          break;

        case 'large':
        case 'lg':
          innerDialog.addClass('modal-lg');
          break;

        case 'extra-large':
        case 'xl':
          innerDialog.addClass('modal-xl');

          // Requires Bootstrap 4.2.0 or higher
          if (options.fullBootstrapVersion.substring(0, 3) < '4.2') {
            console.warn('Using size "xl"/"extra-large" requires Bootstrap 4.2.0 or higher. You appear to be using ' + options.fullBootstrapVersion + '. Please upgrade to use this option.');
          }
          break;
      }
    }

    if (options.scrollable) {
      innerDialog.addClass('modal-dialog-scrollable');

      // Requires Bootstrap 4.3.0 or higher
      if (options.fullBootstrapVersion.substring(0, 3) < '4.3') {
        console.warn('Using "scrollable" requires Bootstrap 4.3.0 or higher. You appear to be using ' + options.fullBootstrapVersion + '. Please upgrade to use this option.');
      }
    }

    if (options.title) {
      body.before(header);
      dialog.find('.modal-title').html(options.title);
    }

    if (options.closeButton) {
      var closeButton = $(templates.closeButton);

      if (options.title) {
        if (options.bootstrap > 3) {
          dialog.find('.modal-header').append(closeButton);
        }
        else {
          dialog.find('.modal-header').prepend(closeButton);
        }
      } else {
        closeButton.prependTo(body);
      }
    }

    if (options.centerVertical) {
      innerDialog.addClass('modal-dialog-centered');

      // Requires Bootstrap 4.0.0-beta.3 or higher
      if (options.fullBootstrapVersion < '4.0.0') {
        console.warn('"centerVertical" requires Bootstrap 4.0.0-beta.3 or higher. You appear to be using ' + options.fullBootstrapVersion + '. Please upgrade to use this option.');
      }
    }

    // Bootstrap event listeners; these handle extra
    // setup & teardown required after the underlying
    // modal has performed certain actions.

    // make sure we unbind any listeners once the dialog has definitively been dismissed
    dialog.one('hide.bs.modal', { dialog: dialog }, unbindModal);

    if (options.onHide) {
      if ($.isFunction(options.onHide)) {
        dialog.on('hide.bs.modal', options.onHide);
      }
      else {
        throw new Error('Argument supplied to "onHide" must be a function');
      }
    }

    dialog.one('hidden.bs.modal', { dialog: dialog }, destroyModal);

    if (options.onHidden) {
      if ($.isFunction(options.onHidden)) {
        dialog.on('hidden.bs.modal', options.onHidden);
      }
      else {
        throw new Error('Argument supplied to "onHidden" must be a function');
      }
    }

    if (options.onShow) {
      if ($.isFunction(options.onShow)) {
        dialog.on('show.bs.modal', options.onShow);
      }
      else {
        throw new Error('Argument supplied to "onShow" must be a function');
      }
    }

    dialog.one('shown.bs.modal', { dialog: dialog }, focusPrimaryButton);

    if (options.onShown) {
      if ($.isFunction(options.onShown)) {
        dialog.on('shown.bs.modal', options.onShown);
      }
      else {
        throw new Error('Argument supplied to "onShown" must be a function');
      }
    }

    // Bootbox event listeners; used to decouple some
    // behaviours from their respective triggers

    if (options.backdrop !== 'static') {
      // A boolean true/false according to the Bootstrap docs
      // should show a dialog the user can dismiss by clicking on
      // the background.
      // We always only ever pass static/false to the actual
      // $.modal function because with "true" we can't trap
      // this event (the .modal-backdrop swallows it)
      // However, we still want to sort-of respect true
      // and invoke the escape mechanism instead
      dialog.on('click.dismiss.bs.modal', function (e) {
        // @NOTE: the target varies in >= 3.3.x releases since the modal backdrop
        // moved *inside* the outer dialog rather than *alongside* it
        if (dialog.children('.modal-backdrop').length) {
          e.currentTarget = dialog.children('.modal-backdrop').get(0);
        }

        if (e.target !== e.currentTarget) {
          return;
        }

        dialog.trigger('escape.close.bb');
      });
    }

    dialog.on('escape.close.bb', function (e) {
      // the if statement looks redundant but it isn't; without it
      // if we *didn't* have an onEscape handler then processCallback
      // would automatically dismiss the dialog
      if (callbacks.onEscape) {
        processCallback(e, dialog, callbacks.onEscape);
      }
    });


    dialog.on('click', '.modal-footer button:not(.disabled)', function (e) {
      var callbackKey = $(this).data('bb-handler');

      if (callbackKey !== undefined) {
        // Only process callbacks for buttons we recognize:
        processCallback(e, dialog, callbacks[callbackKey]);
      }
    });

    dialog.on('click', '.bootbox-close-button', function (e) {
      // onEscape might be falsy but that's fine; the fact is
      // if the user has managed to click the close button we
      // have to close the dialog, callback or not
      processCallback(e, dialog, callbacks.onEscape);
    });

    dialog.on('keyup', function (e) {
      if (e.which === 27) {
        dialog.trigger('escape.close.bb');
      }
    });

    // the remainder of this method simply deals with adding our
    // dialog element to the DOM, augmenting it with Bootstrap's modal
    // functionality and then giving the resulting object back
    // to our caller

    $(options.container).append(dialog);

    dialog.modal({
      backdrop: options.backdrop ? 'static' : false,
      keyboard: false,
      show: false
    });

    if (options.show) {
      dialog.modal('show');
    }

    return dialog;
  };


  // Helper function to simulate the native alert() behavior. **NOTE**: This is non-blocking, so any
  // code that must happen after the alert is dismissed should be placed within the callback function 
  // for this alert.
  exports.alert = function () {
    var options;

    options = mergeDialogOptions('alert', ['ok'], ['message', 'callback'], arguments);

    // @TODO: can this move inside exports.dialog when we're iterating over each
    // button and checking its button.callback value instead?
    if (options.callback && !$.isFunction(options.callback)) {
      throw new Error('alert requires the "callback" property to be a function when provided');
    }

    // override the ok and escape callback to make sure they just invoke
    // the single user-supplied one (if provided)
    options.buttons.ok.callback = options.onEscape = function () {
      if ($.isFunction(options.callback)) {
        return options.callback.call(this);
      }

      return true;
    };

    return exports.dialog(options);
  };


  // Helper function to simulate the native confirm() behavior. **NOTE**: This is non-blocking, so any
  // code that must happen after the confirm is dismissed should be placed within the callback function 
  // for this confirm.
  exports.confirm = function () {
    var options;

    options = mergeDialogOptions('confirm', ['cancel', 'confirm'], ['message', 'callback'], arguments);

    // confirm specific validation; they don't make sense without a callback so make
    // sure it's present
    if (!$.isFunction(options.callback)) {
      throw new Error('confirm requires a callback');
    }

    // overrides; undo anything the user tried to set they shouldn't have
    options.buttons.cancel.callback = options.onEscape = function () {
      return options.callback.call(this, false);
    };

    options.buttons.confirm.callback = function () {
      return options.callback.call(this, true);
    };

    return exports.dialog(options);
  };


  // Helper function to simulate the native prompt() behavior. **NOTE**: This is non-blocking, so any
  // code that must happen after the prompt is dismissed should be placed within the callback function 
  // for this prompt.
  exports.prompt = function () {
    var options;
    var promptDialog;
    var form;
    var input;
    var shouldShow;
    var inputOptions;

    // we have to create our form first otherwise
    // its value is undefined when gearing up our options
    // @TODO this could be solved by allowing message to
    // be a function instead...
    form = $(templates.form);

    // prompt defaults are more complex than others in that
    // users can override more defaults
    options = mergeDialogOptions('prompt', ['cancel', 'confirm'], ['title', 'callback'], arguments);

    if (!options.value) {
      options.value = defaults.value;
    }

    if (!options.inputType) {
      options.inputType = defaults.inputType;
    }

    // capture the user's show value; we always set this to false before
    // spawning the dialog to give us a chance to attach some handlers to
    // it, but we need to make sure we respect a preference not to show it
    shouldShow = (options.show === undefined) ? defaults.show : options.show;

    // This is required prior to calling the dialog builder below - we need to 
    // add an event handler just before the prompt is shown
    options.show = false;

    // Handles the 'cancel' action
    options.buttons.cancel.callback = options.onEscape = function () {
      return options.callback.call(this, null);
    };

    // Prompt submitted - extract the prompt value. This requires a bit of work, 
    // given the different input types available.
    options.buttons.confirm.callback = function () {
      var value;

      if (options.inputType === 'checkbox') {
        value = input.find('input:checked').map(function () {
          return $(this).val();
        }).get();
      } else if (options.inputType === 'radio') {
        value = input.find('input:checked').val();
      }
      else {
        if (input[0].checkValidity && !input[0].checkValidity()) {
          // prevents button callback from being called
          return false;
        } else {
          if (options.inputType === 'select' && options.multiple === true) {
            value = input.find('option:selected').map(function () {
              return $(this).val();
            }).get();
          }
          else {
            value = input.val();
          }
        }
      }

      return options.callback.call(this, value);
    };

    // prompt-specific validation
    if (!options.title) {
      throw new Error('prompt requires a title');
    }

    if (!$.isFunction(options.callback)) {
      throw new Error('prompt requires a callback');
    }

    if (!templates.inputs[options.inputType]) {
      throw new Error('Invalid prompt type');
    }

    // create the input based on the supplied type
    input = $(templates.inputs[options.inputType]);

    switch (options.inputType) {
      case 'text':
      case 'textarea':
      case 'email':
      case 'password':
        input.val(options.value);

        if (options.placeholder) {
          input.attr('placeholder', options.placeholder);
        }

        if (options.pattern) {
          input.attr('pattern', options.pattern);
        }

        if (options.maxlength) {
          input.attr('maxlength', options.maxlength);
        }

        if (options.required) {
          input.prop({ 'required': true });
        }

        if (options.rows && !isNaN(parseInt(options.rows))) {
          if (options.inputType === 'textarea') {
            input.attr({ 'rows': options.rows });
          }
        }

        break;


      case 'date':
      case 'time':
      case 'number':
      case 'range':
        input.val(options.value);

        if (options.placeholder) {
          input.attr('placeholder', options.placeholder);
        }

        if (options.pattern) {
          input.attr('pattern', options.pattern);
        }

        if (options.required) {
          input.prop({ 'required': true });
        }

        // These input types have extra attributes which affect their input validation.
        // Warning: For most browsers, date inputs are buggy in their implementation of 'step', so 
        // this attribute will have no effect. Therefore, we don't set the attribute for date inputs.
        // @see https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/date#Setting_maximum_and_minimum_dates
        if (options.inputType !== 'date') {
          if (options.step) {
            if (options.step === 'any' || (!isNaN(options.step) && parseFloat(options.step) > 0)) {
              input.attr('step', options.step);
            }
            else {
              throw new Error('"step" must be a valid positive number or the value "any". See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-step for more information.');
            }
          }
        }

        if (minAndMaxAreValid(options.inputType, options.min, options.max)) {
          if (options.min !== undefined) {
            input.attr('min', options.min);
          }
          if (options.max !== undefined) {
            input.attr('max', options.max);
          }
        }

        break;


      case 'select':
        var groups = {};
        inputOptions = options.inputOptions || [];

        if (!$.isArray(inputOptions)) {
          throw new Error('Please pass an array of input options');
        }

        if (!inputOptions.length) {
          throw new Error('prompt with "inputType" set to "select" requires at least one option');
        }

        // placeholder is not actually a valid attribute for select,
        // but we'll allow it, assuming it might be used for a plugin
        if (options.placeholder) {
          input.attr('placeholder', options.placeholder);
        }

        if (options.required) {
          input.prop({ 'required': true });
        }

        if (options.multiple) {
          input.prop({ 'multiple': true });
        }

        each(inputOptions, function (_, option) {
          // assume the element to attach to is the input...
          var elem = input;

          if (option.value === undefined || option.text === undefined) {
            throw new Error('each option needs a "value" property and a "text" property');
          }

          // ... but override that element if this option sits in a group

          if (option.group) {
            // initialise group if necessary
            if (!groups[option.group]) {
              groups[option.group] = $('<optgroup />').attr('label', option.group);
            }

            elem = groups[option.group];
          }

          var o = $(templates.option);
          o.attr('value', option.value).text(option.text);
          elem.append(o);
        });

        each(groups, function (_, group) {
          input.append(group);
        });

        // safe to set a select's value as per a normal input
        input.val(options.value);

        break;


      case 'checkbox':
        var checkboxValues = $.isArray(options.value) ? options.value : [options.value];
        inputOptions = options.inputOptions || [];

        if (!inputOptions.length) {
          throw new Error('prompt with "inputType" set to "checkbox" requires at least one option');
        }

        // checkboxes have to nest within a containing element, so
        // they break the rules a bit and we end up re-assigning
        // our 'input' element to this container instead
        input = $('<div class="bootbox-checkbox-list"></div>');

        each(inputOptions, function (_, option) {
          if (option.value === undefined || option.text === undefined) {
            throw new Error('each option needs a "value" property and a "text" property');
          }

          var checkbox = $(templates.inputs[options.inputType]);

          checkbox.find('input').attr('value', option.value);
          checkbox.find('label').append('\n' + option.text);

          // we've ensured values is an array so we can always iterate over it
          each(checkboxValues, function (_, value) {
            if (value === option.value) {
              checkbox.find('input').prop('checked', true);
            }
          });

          input.append(checkbox);
        });
        break;


      case 'radio':
        // Make sure that value is not an array (only a single radio can ever be checked)
        if (options.value !== undefined && $.isArray(options.value)) {
          throw new Error('prompt with "inputType" set to "radio" requires a single, non-array value for "value"');
        }

        inputOptions = options.inputOptions || [];

        if (!inputOptions.length) {
          throw new Error('prompt with "inputType" set to "radio" requires at least one option');
        }

        // Radiobuttons have to nest within a containing element, so
        // they break the rules a bit and we end up re-assigning
        // our 'input' element to this container instead
        input = $('<div class="bootbox-radiobutton-list"></div>');

        // Radiobuttons should always have an initial checked input checked in a "group".
        // If value is undefined or doesn't match an input option, select the first radiobutton
        var checkFirstRadio = true;

        each(inputOptions, function (_, option) {
          if (option.value === undefined || option.text === undefined) {
            throw new Error('each option needs a "value" property and a "text" property');
          }

          var radio = $(templates.inputs[options.inputType]);

          radio.find('input').attr('value', option.value);
          radio.find('label').append('\n' + option.text);

          if (options.value !== undefined) {
            if (option.value === options.value) {
              radio.find('input').prop('checked', true);
              checkFirstRadio = false;
            }
          }

          input.append(radio);
        });

        if (checkFirstRadio) {
          input.find('input[type="radio"]').first().prop('checked', true);
        }
        break;
    }

    // now place it in our form
    form.append(input);

    form.on('submit', function (e) {
      e.preventDefault();
      // Fix for SammyJS (or similar JS routing library) hijacking the form post.
      e.stopPropagation();

      // @TODO can we actually click *the* button object instead?
      // e.g. buttons.confirm.click() or similar
      promptDialog.find('.bootbox-accept').trigger('click');
    });

    if ($.trim(options.message) !== '') {
      // Add the form to whatever content the user may have added.
      var message = $(templates.promptMessage).html(options.message);
      form.prepend(message);
      options.message = form;
    }
    else {
      options.message = form;
    }

    // Generate the dialog
    promptDialog = exports.dialog(options);

    // clear the existing handler focusing the submit button...
    promptDialog.off('shown.bs.modal', focusPrimaryButton);

    // ...and replace it with one focusing our input, if possible
    promptDialog.on('shown.bs.modal', function () {
      // need the closure here since input isn't
      // an object otherwise
      input.focus();
    });

    if (shouldShow === true) {
      promptDialog.modal('show');
    }

    return promptDialog;
  };


  // INTERNAL FUNCTIONS
  // *************************************************************************************************************

  // Map a flexible set of arguments into a single returned object
  // If args.length is already one just return it, otherwise
  // use the properties argument to map the unnamed args to
  // object properties.
  // So in the latter case:
  //  mapArguments(["foo", $.noop], ["message", "callback"])
  //  -> { message: "foo", callback: $.noop }
  function mapArguments(args, properties) {
    var argn = args.length;
    var options = {};

    if (argn < 1 || argn > 2) {
      throw new Error('Invalid argument length');
    }

    if (argn === 2 || typeof args[0] === 'string') {
      options[properties[0]] = args[0];
      options[properties[1]] = args[1];
    } else {
      options = args[0];
    }

    return options;
  }


  //  Merge a set of default dialog options with user supplied arguments
  function mergeArguments(defaults, args, properties) {
    return $.extend(
      // deep merge
      true,
      // ensure the target is an empty, unreferenced object
      {},
      // the base options object for this type of dialog (often just buttons)
      defaults,
      // args could be an object or array; if it's an array properties will
      // map it to a proper options object
      mapArguments(
        args,
        properties
      )
    );
  }


  //  This entry-level method makes heavy use of composition to take a simple
  //  range of inputs and return valid options suitable for passing to bootbox.dialog
  function mergeDialogOptions(className, labels, properties, args) {
    var locale;
    if (args && args[0]) {
      locale = args[0].locale || defaults.locale;
      var swapButtons = args[0].swapButtonOrder || defaults.swapButtonOrder;

      if (swapButtons) {
        labels = labels.reverse();
      }
    }

    //  build up a base set of dialog properties
    var baseOptions = {
      className: 'bootbox-' + className,
      buttons: createLabels(labels, locale)
    };

    // Ensure the buttons properties generated, *after* merging
    // with user args are still valid against the supplied labels
    return validateButtons(
      // merge the generated base properties with user supplied arguments
      mergeArguments(
        baseOptions,
        args,
        // if args.length > 1, properties specify how each arg maps to an object key
        properties
      ),
      labels
    );
  }


  //  Checks each button object to see if key is valid. 
  //  This function will only be called by the alert, confirm, and prompt helpers. 
  function validateButtons(options, buttons) {
    var allowedButtons = {};
    each(buttons, function (key, value) {
      allowedButtons[value] = true;
    });

    each(options.buttons, function (key) {
      if (allowedButtons[key] === undefined) {
        throw new Error('button key "' + key + '" is not allowed (options are ' + buttons.join(' ') + ')');
      }
    });

    return options;
  }



  //  From a given list of arguments, return a suitable object of button labels.
  //  All this does is normalise the given labels and translate them where possible.
  //  e.g. "ok", "confirm" -> { ok: "OK", cancel: "Annuleren" }
  function createLabels(labels, locale) {
    var buttons = {};

    for (var i = 0, j = labels.length; i < j; i++) {
      var argument = labels[i];
      var key = argument.toLowerCase();
      var value = argument.toUpperCase();

      buttons[key] = {
        label: getText(value, locale)
      };
    }

    return buttons;
  }



  //  Get localized text from a locale. Defaults to 'en' locale if no locale 
  //  provided or a non-registered locale is requested
  function getText(key, locale) {
    var labels = locales[locale];

    return labels ? labels[key] : locales.en[key];
  }



  //  Filter and tidy up any user supplied parameters to this dialog.
  //  Also looks for any shorthands used and ensures that the options
  //  which are returned are all normalized properly
  function sanitize(options) {
    var buttons;
    var total;

    if (typeof options !== 'object') {
      throw new Error('Please supply an object of options');
    }

    if (!options.message) {
      throw new Error('"message" option must not be null or an empty string.');
    }

    // make sure any supplied options take precedence over defaults
    options = $.extend({}, defaults, options);

    // no buttons is still a valid dialog but it's cleaner to always have
    // a buttons object to iterate over, even if it's empty
    if (!options.buttons) {
      options.buttons = {};
    }

    buttons = options.buttons;

    total = getKeyLength(buttons);

    each(buttons, function (key, button, index) {
      if ($.isFunction(button)) {
        // short form, assume value is our callback. Since button
        // isn't an object it isn't a reference either so re-assign it
        button = buttons[key] = {
          callback: button
        };
      }

      // before any further checks make sure by now button is the correct type
      if ($.type(button) !== 'object') {
        throw new Error('button with key "' + key + '" must be an object');
      }

      if (!button.label) {
        // the lack of an explicit label means we'll assume the key is good enough
        button.label = key;
      }

      if (!button.className) {
        var isPrimary = false;
        if (options.swapButtonOrder) {
          isPrimary = index === 0;
        }
        else {
          isPrimary = index === total - 1;
        }

        if (total <= 2 && isPrimary) {
          // always add a primary to the main option in a one or two-button dialog
          button.className = 'btn-primary';
        } else {
          // adding both classes allows us to target both BS3 and BS4 without needing to check the version
          button.className = 'btn-secondary btn-default';
        }
      }
    });

    return options;
  }


  //  Returns a count of the properties defined on the object
  function getKeyLength(obj) {
    return Object.keys(obj).length;
  }


  //  Tiny wrapper function around jQuery.each; just adds index as the third parameter
  function each(collection, iterator) {
    var index = 0;
    $.each(collection, function (key, value) {
      iterator(key, value, index++);
    });
  }


  function focusPrimaryButton(e) {
    e.data.dialog.find('.bootbox-accept').first().trigger('focus');
  }


  function destroyModal(e) {
    // ensure we don't accidentally intercept hidden events triggered
    // by children of the current dialog. We shouldn't need to handle this anymore, 
    // now that Bootstrap namespaces its events, but still worth doing.
    if (e.target === e.data.dialog[0]) {
      e.data.dialog.remove();
    }
  }


  function unbindModal(e) {
    if (e.target === e.data.dialog[0]) {
      e.data.dialog.off('escape.close.bb');
      e.data.dialog.off('click');
    }
  }


  //  Handle the invoked dialog callback
  function processCallback(e, dialog, callback) {
    e.stopPropagation();
    e.preventDefault();

    // by default we assume a callback will get rid of the dialog,
    // although it is given the opportunity to override this

    // so, if the callback can be invoked and it *explicitly returns false*
    // then we'll set a flag to keep the dialog active...
    var preserveDialog = $.isFunction(callback) && callback.call(dialog, e) === false;

    // ... otherwise we'll bin it
    if (!preserveDialog) {
      dialog.modal('hide');
    }
  }

  // Validate `min` and `max` values based on the current `inputType` value
  function minAndMaxAreValid(type, min, max) {
    var result = false;
    var minValid = true;
    var maxValid = true;

    if (type === 'date') {
      if (min !== undefined && !(minValid = dateIsValid(min))) {
        console.warn('Browsers which natively support the "date" input type expect date values to be of the form "YYYY-MM-DD" (see ISO-8601 https://www.iso.org/iso-8601-date-and-time-format.html). Bootbox does not enforce this rule, but your min value may not be enforced by this browser.');
      }
      else if (max !== undefined && !(maxValid = dateIsValid(max))) {
        console.warn('Browsers which natively support the "date" input type expect date values to be of the form "YYYY-MM-DD" (see ISO-8601 https://www.iso.org/iso-8601-date-and-time-format.html). Bootbox does not enforce this rule, but your max value may not be enforced by this browser.');
      }
    }
    else if (type === 'time') {
      if (min !== undefined && !(minValid = timeIsValid(min))) {
        throw new Error('"min" is not a valid time. See https://www.w3.org/TR/2012/WD-html-markup-20120315/datatypes.html#form.data.time for more information.');
      }
      else if (max !== undefined && !(maxValid = timeIsValid(max))) {
        throw new Error('"max" is not a valid time. See https://www.w3.org/TR/2012/WD-html-markup-20120315/datatypes.html#form.data.time for more information.');
      }
    }
    else {
      if (min !== undefined && isNaN(min)) {
        minValid = false;
        throw new Error('"min" must be a valid number. See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-min for more information.');
      }

      if (max !== undefined && isNaN(max)) {
        maxValid = false;
        throw new Error('"max" must be a valid number. See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-max for more information.');
      }
    }

    if (minValid && maxValid) {
      if (max <= min) {
        throw new Error('"max" must be greater than "min". See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-max for more information.');
      }
      else {
        result = true;
      }
    }

    return result;
  }

  function timeIsValid(value) {
    return /([01][0-9]|2[0-3]):[0-5][0-9]?:[0-5][0-9]/.test(value);
  }

  function dateIsValid(value) {
    return /(\d{4})-(\d{2})-(\d{2})/.test(value);
  }

  //  The Bootbox object
  return exports;
}));