/**
 * @ngdoc module
 * @name material.components.content
 *
 * @description
 * Scrollable content
 */
angular.module('material.components.content', [
  'material.core'
])
  .directive('mdContent', mdContentDirective);

/**
 * @ngdoc directive
 * @name mdContent
 * @module material.components.content
 *
 * @restrict E
 *
 * @description
 * The `<md-content>` directive is a container element useful for scrollable content
 *
 * @usage
 *
 * - Add the `[layout-padding]` attribute to make the content padded.
 *
 * <hljs lang="html">
 *  <md-content layout-padding>
 *      Lorem ipsum dolor sit amet, ne quod novum mei.
 *  </md-content>
 * </hljs>
 *
 */

function mdContentDirective($mdTheming) {
  return {
    restrict: 'E',
    controller: ['$scope', '$element', ContentController],
    link: function(scope, element, attr) {
      var node = element[0];

      $mdTheming(element);
      scope.$broadcast('$mdContentLoaded', element);

      iosScrollFix(element[0]);
    }
  };

  function ContentController($scope, $element) {
    this.$scope = $scope;
    this.$element = $element;
  }
}

function iosScrollFix(node) {
  // IOS FIX:
  // If we scroll where there is no more room for the webview to scroll,
  // by default the webview itself will scroll up and down, this looks really
  // bad.  So if we are scrolling to the very top or bottom, add/subtract one
  angular.element(node).on('$md.pressdown', function(ev) {
    // Only touch events
    if (ev.pointer.type !== 't') return;
    // Don't let a child content's touchstart ruin it for us.
    if (ev.$materialScrollFixed) return;
    ev.$materialScrollFixed = true;

    if (node.scrollTop === 0) {
      node.scrollTop = 1;
    } else if (node.scrollHeight === node.scrollTop + node.offsetHeight) {
      node.scrollTop -= 1;
    }
  });
}
