/**
 * @ngdoc module
 * @name material.components.input
 */

angular.module('material.components.input', [
  'material.core'
])
  .directive('mdInputContainer', mdInputContainerDirective)
  .directive('label', labelDirective)
  .directive('input', inputTextareaDirective)
  .directive('textarea', inputTextareaDirective)
  .directive('mdMaxlength', mdMaxlengthDirective)
  .directive('placeholder', placeholderDirective);

/**
 * @ngdoc directive
 * @name mdInputContainer
 * @module material.components.input
 *
 * @restrict E
 *
 * @description
 * `<md-input-container>` is the parent of any input or textarea element.
 *
 * Input and textarea elements will not behave properly unless the md-input-container
 * parent is provided.
 *
 * @param md-is-error {expression=} When the given expression evaluates to true, the input container will go into error state. Defaults to erroring if the input has been touched and is invalid.
 * @param md-no-float {boolean=} When present, placeholders will not be converted to floating labels
 *
 * @usage
 * <hljs lang="html">
 *
 * <md-input-container>
 *   <label>Username</label>
 *   <input type="text" ng-model="user.name">
 * </md-input-container>
 *
 * <md-input-container>
 *   <label>Description</label>
 *   <textarea ng-model="user.description"></textarea>
 * </md-input-container>
 *
 * </hljs>
 */
function mdInputContainerDirective($mdTheming, $parse) {
  return {
    restrict: 'E',
    link: postLink,
    controller: ContainerCtrl
  };

  function postLink(scope, element, attr) {
    $mdTheming(element);
  }
  function ContainerCtrl($scope, $element, $attrs) {
    var self = this;

    self.isErrorGetter = $attrs.mdIsError && $parse($attrs.mdIsError);

    self.delegateClick = function() {
      self.input.focus();
    };
    self.element = $element;
    self.setFocused = function(isFocused) {
      $element.toggleClass('md-input-focused', !!isFocused);
    };
    self.setHasValue = function(hasValue) {
      $element.toggleClass('md-input-has-value', !!hasValue);
    };
    self.setInvalid = function(isInvalid) {
      $element.toggleClass('md-input-invalid', !!isInvalid);
    };
    $scope.$watch(function() {
      return self.label && self.input;
    }, function(hasLabelAndInput) {
      if (hasLabelAndInput && !self.label.attr('for')) {
        self.label.attr('for', self.input.attr('id'));
      }
    });
  }
}

function labelDirective() {
  return {
    restrict: 'E',
    require: '^?mdInputContainer',
    link: function(scope, element, attr, containerCtrl) {
      if (!containerCtrl || attr.mdNoFloat) return;

      containerCtrl.label = element;
      scope.$on('$destroy', function() {
        containerCtrl.label = null;
      });
    }
  };
}

/**
 * @ngdoc directive
 * @name mdInput
 * @restrict E
 * @module material.components.input
 *
 * @description
 * Use the `<input>` or the  `<textarea>` as a child of an `<md-input-container>`.
 *
 * @param {number=} md-maxlength The maximum number of characters allowed in this input. If this is specified, a character counter will be shown underneath the input.<br/><br/>
 * The purpose of **`md-maxlength`** is exactly to show the max length counter text. If you don't want the counter text and only need "plain" validation, you can use the "simple" `ng-maxlength` or maxlength attributes.
 * @param {string=} aria-label Aria-label is required when no label is present.  A warning message will be logged in the console if not present.
 * @param {string=} placeholder An alternative approach to using aria-label when the label is not present.  The placeholder text is copied to the aria-label attribute.
 * @param md-no-autogrow {boolean=} When present, textareas will not grow automatically.
 *
 * @usage
 * <hljs lang="html">
 * <md-input-container>
 *   <label>Color</label>
 *   <input type="text" ng-model="color" required md-maxlength="10">
 * </md-input-container>
 * </hljs>
 * <h3>With Errors</h3>
 *
 * <hljs lang="html">
 * <form name="userForm">
 *   <md-input-container>
 *     <label>Last Name</label>
 *     <input name="lastName" ng-model="lastName" required md-maxlength="10" minlength="4">
 *     <div ng-messages="userForm.lastName.$error" ng-show="userForm.lastName.$dirty">
 *       <div ng-message="required">This is required!</div>
 *       <div ng-message="md-maxlength">That's too long!</div>
 *       <div ng-message="minlength">That's too short!</div>
 *     </div>
 *   </md-input-container>
 *   <md-input-container>
 *     <label>Biography</label>
 *     <textarea name="bio" ng-model="biography" required md-maxlength="150"></textarea>
 *     <div ng-messages="userForm.bio.$error" ng-show="userForm.bio.$dirty">
 *       <div ng-message="required">This is required!</div>
 *       <div ng-message="md-maxlength">That's too long!</div>
 *     </div>
 *   </md-input-container>
 *   <md-input-container>
 *     <input aria-label='title' ng-model='title'>
 *   </md-input-container>
 *   <md-input-container>
 *     <input placeholder='title' ng-model='title'>
 *   </md-input-container>
 * </form>
 * </hljs>
 *
 * Requires [ngMessages](https://docs.angularjs.org/api/ngMessages).
 * Behaves like the [AngularJS input directive](https://docs.angularjs.org/api/ng/directive/input).
 *
 */

function inputTextareaDirective($mdUtil, $window, $mdAria) {
  return {
    restrict: 'E',
    require: ['^?mdInputContainer', '?ngModel'],
    link: postLink
  };

  function postLink(scope, element, attr, ctrls) {

    var containerCtrl = ctrls[0];
    var ngModelCtrl = ctrls[1] || $mdUtil.fakeNgModel();
    var isReadonly = angular.isDefined(attr.readonly);

    if ( !containerCtrl ) return;
    if (containerCtrl.input) {
      throw new Error("<md-input-container> can only have *one* <input>, <textarea> or <md-select> child element!");
    }
    containerCtrl.input = element;

    if(!containerCtrl.label) {
      $mdAria.expect(element, 'aria-label', element.attr('placeholder'));
    }

    element.addClass('md-input');
    if (!element.attr('id')) {
      element.attr('id', 'input_' + $mdUtil.nextUid());
    }

    if (element[0].tagName.toLowerCase() === 'textarea') {
      setupTextarea();
    }

    var isErrorGetter = containerCtrl.isErrorGetter || function() {
      return ngModelCtrl.$invalid && ngModelCtrl.$touched;
    };
    scope.$watch(isErrorGetter, containerCtrl.setInvalid);

    ngModelCtrl.$parsers.push(ngModelPipelineCheckValue);
    ngModelCtrl.$formatters.push(ngModelPipelineCheckValue);

    element.on('input', inputCheckValue);

    if (!isReadonly) {
      element
        .on('focus', function(ev) {
          containerCtrl.setFocused(true);
        })
        .on('blur', function(ev) {
          containerCtrl.setFocused(false);
          inputCheckValue();
        });

    }

    //ngModelCtrl.$setTouched();
    //if( ngModelCtrl.$invalid ) containerCtrl.setInvalid();

    scope.$on('$destroy', function() {
      containerCtrl.setFocused(false);
      containerCtrl.setHasValue(false);
      containerCtrl.input = null;
    });

    /**
     *
     */
    function ngModelPipelineCheckValue(arg) {
      containerCtrl.setHasValue(!ngModelCtrl.$isEmpty(arg));
      return arg;
    }
    function inputCheckValue() {
      // An input's value counts if its length > 0,
      // or if the input's validity state says it has bad input (eg string in a number input)
      containerCtrl.setHasValue(element.val().length > 0 || (element[0].validity||{}).badInput);
    }

    function setupTextarea() {
      if(angular.isDefined(element.attr('md-no-autogrow'))) {
        return;
      }

      var node = element[0];
      var container = containerCtrl.element[0];

      var min_rows = NaN;
      var lineHeight = null;
      // can't check if height was or not explicity set,
      // so rows attribute will take precedence if present
      if(node.hasAttribute('rows')) {
        min_rows = parseInt(node.getAttribute('rows'));
      }

      var onChangeTextarea = $mdUtil.debounce(growTextarea, 1);

      function pipelineListener(value) {
        onChangeTextarea();
        return value;
      }

      if (ngModelCtrl) {
        ngModelCtrl.$formatters.push(pipelineListener);
        ngModelCtrl.$viewChangeListeners.push(pipelineListener);
      } else {
        onChangeTextarea();
      }
      element.on('keydown input', onChangeTextarea);

      if(isNaN(min_rows)) {
        element.attr('rows', '1');

        element.on('scroll', onScroll);
      }

      angular.element($window).on('resize', onChangeTextarea);

      scope.$on('$destroy', function() {
        angular.element($window).off('resize', onChangeTextarea);
      });

      function growTextarea() {
        // sets the md-input-container height to avoid jumping around
        container.style.height = container.offsetHeight + 'px';

        // temporarily disables element's flex so its height 'runs free'
        element.addClass('md-no-flex');

        if(isNaN(min_rows)) {
          node.style.height = "auto";
          node.scrollTop = 0;
          var height = getHeight();
          if (height) node.style.height = height + 'px';
        } else {
          node.setAttribute("rows", 1);

          if(!lineHeight) {
            node.style.minHeight = '0';

            lineHeight = element.prop('clientHeight');

            node.style.minHeight = null;
          }

          var rows = Math.max(min_rows, Math.round(node.scrollHeight / lineHeight));
          node.setAttribute("rows", rows);
        }

        // reset everything back to normal
        element.removeClass('md-no-flex');
        container.style.height = 'auto';
      }

      function getHeight () {
        var line = node.scrollHeight - node.offsetHeight;
        return node.offsetHeight + (line > 0 ? line : 0);
      }

      function onScroll(e) {
        node.scrollTop = 0;
        // for smooth new line adding
        var line = node.scrollHeight - node.offsetHeight;
        var height = node.offsetHeight + line;
        node.style.height = height + 'px';
      }
    }
  }
}

function mdMaxlengthDirective($animate) {
  return {
    restrict: 'A',
    require: ['ngModel', '^mdInputContainer'],
    link: postLink
  };

  function postLink(scope, element, attr, ctrls) {
    var maxlength;
    var ngModelCtrl = ctrls[0];
    var containerCtrl = ctrls[1];
    var charCountEl = angular.element('<div class="md-char-counter">');

    // Stop model from trimming. This makes it so whitespace
    // over the maxlength still counts as invalid.
    attr.$set('ngTrim', 'false');
    containerCtrl.element.append(charCountEl);

    ngModelCtrl.$formatters.push(renderCharCount);
    ngModelCtrl.$viewChangeListeners.push(renderCharCount);
    element.on('input keydown', function() {
      renderCharCount(); //make sure it's called with no args
    });

    scope.$watch(attr.mdMaxlength, function(value) {
      maxlength = value;
      if (angular.isNumber(value) && value > 0) {
        if (!charCountEl.parent().length) {
          $animate.enter(charCountEl, containerCtrl.element,
                         angular.element(containerCtrl.element[0].lastElementChild));
        }
        renderCharCount();
      } else {
        $animate.leave(charCountEl);
      }
    });

    ngModelCtrl.$validators['md-maxlength'] = function(modelValue, viewValue) {
      if (!angular.isNumber(maxlength) || maxlength < 0) {
        return true;
      }
      return ( modelValue || element.val() || viewValue || '' ).length <= maxlength;
    };

    function renderCharCount(value) {
      charCountEl.text( ( element.val() || value || '' ).length + '/' + maxlength );
      return value;
    }
  }
}

function placeholderDirective($log) {
  return {
    restrict: 'A',
    require: '^^?mdInputContainer',
    priority: 200,
    link: postLink
  };

  function postLink(scope, element, attr, inputContainer) {
    if (!inputContainer) return;
    if (angular.isDefined(inputContainer.element.attr('md-no-float'))) return;

    var placeholderText = attr.placeholder;
    element.removeAttr('placeholder');

    if ( inputContainer.element.find('label').length == 0 ) {
      if (inputContainer.input && inputContainer.input[0].nodeName != 'MD-SELECT') {
        var placeholder = '<label ng-click="delegateClick()">' + placeholderText + '</label>';

        inputContainer.element.addClass('md-icon-float');
        inputContainer.element.prepend(placeholder);
      }
    } else if (element[0].nodeName != 'MD-SELECT') {
      $log.warn("The placeholder='" + placeholderText + "' will be ignored since this md-input-container has a child label element.");
    }

  }
}
