(function(angular) {

  // Define module.
  var module = angular.module('bootstrapModal', []);

  // Define service.
  module.service('$bootstrapModal', ['$q', '$templateRequest', '$rootScope', '$compile', '$controller', function($q, $templateRequest, $rootScope, $compile, $controller) {

    var self = this, $element, closedDeferred;

    // Gets template or template URL.
    var getTemplate = function(template, templateUrl) {
      var deferred = $q.defer();

      // Template string.
      if (template) {
        deferred.resolve(template);
      }

      // Template URL.
      else if (templateUrl) {
        $templateRequest(templateUrl, true).then(function(template) {
          deferred.resolve(template);
        }, function(error) {
          deferred.reject(error);
        });
      }

      // No template specified.
      else {
        deferred.reject('No modal template or templateUrl was specified.');
      }

      return deferred.promise;
    };

    // Closes modal.
    self.close = function() {
      closedDeferred = closedDeferred || $q.defer();

      if ($element) {
        $element.modal('hide');
      }
      else {
        closedDeferred.resolve();
      }

      return closedDeferred.promise;
    };

    // Opens modal.
    self.open = function(options) {
      var deferred = $q.defer();

      // Close open modal.
      this.close().catch(function(error) {
        deferred.reject(error);
      })

      // Get template.
      .then(function() {
        return getTemplate(options.template, options.templateUrl).catch(function(error) {
          deferred.reject(error);
        });
      })

      // Open modal.
      .then(function(template) {
        // Create scope with special $close() method.
        var scope = (options.scope || $rootScope).$new();
        angular.extend(scope, {$close: self.close}, options.data);

        // Bind template to scope.
        var element = $compile(template)(scope);

        // Create controller.
        element.controller = $controller(options.controller, {
          $scope: scope
        });

        // Create closed deferred.
        closedDeferred = $q.defer();

        // Append modal element to body.
        $element = $(element).appendTo('body')

        // Modal is shown.
        .on('shown.bs.modal', function() {
          // Autofocus support.
          angular.forEach($element.find('input,button,select,textarea'), function(input) {
            if (input.attributes.getNamedItem('autofocus')) {
              input.focus();
            }
          });

          // Resolve deferred and include closed deferred.
          deferred.resolve(angular.extend({}, self, {
            closed: closedDeferred.promise
          }));
        })

        // Modal is closed.
        .on('hidden.bs.modal', function() {
          $element.remove();
          $element = null;
          closedDeferred.resolve();
        })

        // Show modal.
        .modal();
      });

      return deferred.promise;
    };

  }]);

}(angular));