/**
 * @ngdoc module
 * @name material.core.ripple
 * @description
 * Ripple
 */
angular.module('material.core')
    .provider('$mdInkRipple', InkRippleProvider)
    .directive('mdInkRipple', InkRippleDirective)
    .directive('mdNoInk', attrNoDirective)
    .directive('mdNoBar', attrNoDirective)
    .directive('mdNoStretch', attrNoDirective);

var DURATION = 450;

/**
 * @ngdoc directive
 * @name mdInkRipple
 * @module material.core.ripple
 *
 * @description
 * The `md-ink-ripple` directive allows you to specify the ripple color or id a ripple is allowed.
 *
 * @param {string|boolean} md-ink-ripple A color string `#FF0000` or boolean (`false` or `0`) for preventing ripple
 *
 * @usage
 * ### String values
 * <hljs lang="html">
 *   <ANY md-ink-ripple="#FF0000">
 *     Ripples in red
 *   </ANY>
 *
 *   <ANY md-ink-ripple="false">
 *     Not rippling
 *   </ANY>
 * </hljs>
 *
 * ### Interpolated values
 * <hljs lang="html">
 *   <ANY md-ink-ripple="{{ randomColor() }}">
 *     Ripples with the return value of 'randomColor' function
 *   </ANY>
 *
 *   <ANY md-ink-ripple="{{ canRipple() }}">
 *     Ripples if 'canRipple' function return value is not 'false' or '0'
 *   </ANY>
 * </hljs>
 */
function InkRippleDirective ($mdButtonInkRipple, $mdCheckboxInkRipple) {
  return {
    controller: angular.noop,
    link:       function (scope, element, attr) {
      attr.hasOwnProperty('mdInkRippleCheckbox')
          ? $mdCheckboxInkRipple.attach(scope, element)
          : $mdButtonInkRipple.attach(scope, element);
    }
  };
}

/**
 * @ngdoc service
 * @name $mdInkRipple
 * @module material.core.ripple
 *
 * @description
 * `$mdInkRipple` is a service for adding ripples to any element
 *
 * @usage
 * <hljs lang="js">
 * app.factory('$myElementInkRipple', function($mdInkRipple) {
 *   return {
 *     attach: function (scope, element, options) {
 *       return $mdInkRipple.attach(scope, element, angular.extend({
 *         center: false,
 *         dimBackground: true
 *       }, options));
 *     }
 *   };
 * });
 *
 * app.controller('myController', function ($scope, $element, $myElementInkRipple) {
 *   $scope.onClick = function (ev) {
 *     $myElementInkRipple.attach($scope, angular.element(ev.target), { center: true });
 *   }
 * });
 * </hljs>
 *
 * ### Disabling ripples globally
 * If you want to disable ink ripples globally, for all components, you can call the
 * `disableInkRipple` method in your app's config.
 *
 * <hljs lang="js">
 * app.config(function ($mdInkRippleProvider) {
 *   $mdInkRippleProvider.disableInkRipple();
 * });
 */

function InkRippleProvider () {
  var isDisabledGlobally = false;

  return {
    disableInkRipple: disableInkRipple,
    $get: function($injector) {
      return { attach: attach };

      /**
       * @ngdoc method
       * @name $mdInkRipple#attach
       *
       * @description
       * Attaching given scope, element and options to inkRipple controller
       *
       * @param {object=} scope Scope within the current context
       * @param {object=} element The element the ripple effect should be applied to
       * @param {object=} options (Optional) Configuration options to override the defaultRipple configuration
       * * `center` -  Whether the ripple should start from the center of the container element
       * * `dimBackground` - Whether the background should be dimmed with the ripple color
       * * `colorElement` - The element the ripple should take its color from, defined by css property `color`
       * * `fitRipple` - Whether the ripple should fill the element
       */
      function attach (scope, element, options) {
        if (isDisabledGlobally || element.controller('mdNoInk')) return angular.noop;
        return $injector.instantiate(InkRippleCtrl, {
          $scope:        scope,
          $element:      element,
          rippleOptions: options
        });
      }
    }
  };

  /**
   * @ngdoc method
   * @name $mdInkRipple#disableInkRipple
   *
   * @description
   * A config-time method that, when called, disables ripples globally.
   */
  function disableInkRipple () {
    isDisabledGlobally = true;
  }
}

/**
 * Controller used by the ripple service in order to apply ripples
 * @ngInject
 */
function InkRippleCtrl ($scope, $element, rippleOptions, $window, $timeout, $mdUtil, $mdColorUtil) {
  this.$window    = $window;
  this.$timeout   = $timeout;
  this.$mdUtil    = $mdUtil;
  this.$mdColorUtil    = $mdColorUtil;
  this.$scope     = $scope;
  this.$element   = $element;
  this.options    = rippleOptions;
  this.mousedown  = false;
  this.ripples    = [];
  this.timeout    = null; // Stores a reference to the most-recent ripple timeout
  this.lastRipple = null;

  $mdUtil.valueOnUse(this, 'container', this.createContainer);

  this.$element.addClass('md-ink-ripple');

  // attach method for unit tests
  ($element.controller('mdInkRipple') || {}).createRipple = angular.bind(this, this.createRipple);
  ($element.controller('mdInkRipple') || {}).setColor = angular.bind(this, this.color);

  this.bindEvents();
}


/**
 * Either remove or unlock any remaining ripples when the user mouses off of the element (either by
 * mouseup or mouseleave event)
 */
function autoCleanup (self, cleanupFn) {

  if ( self.mousedown || self.lastRipple ) {
    self.mousedown = false;
    self.$mdUtil.nextTick( angular.bind(self, cleanupFn), false);
  }

}


/**
 * Returns the color that the ripple should be (either based on CSS or hard-coded)
 * @returns {string}
 */
InkRippleCtrl.prototype.color = function (value) {
  var self = this;

  // If assigning a color value, apply it to background and the ripple color
  if (angular.isDefined(value)) {
    self._color = self._parseColor(value);
  }

  // If color lookup, use assigned, defined, or inherited
  return self._color || self._parseColor( self.inkRipple() ) || self._parseColor( getElementColor() );

  /**
   * Finds the color element and returns its text color for use as default ripple color
   * @returns {string}
   */
  function getElementColor () {
    var items = self.options && self.options.colorElement ? self.options.colorElement : [];
    var elem =  items.length ? items[ 0 ] : self.$element[ 0 ];

    return elem ? self.$window.getComputedStyle(elem).color : 'rgb(0,0,0)';
  }
};

/**
 * Updating the ripple colors based on the current inkRipple value
 * or the element's computed style color
 */
InkRippleCtrl.prototype.calculateColor = function () {
  return this.color();
};


/**
 * Takes a string color and converts it to RGBA format
 * @param color {string}
 * @param [multiplier] {int}
 * @returns {string}
 */

InkRippleCtrl.prototype._parseColor = function parseColor (color, multiplier) {
  multiplier = multiplier || 1;
  var colorUtil = this.$mdColorUtil;

  if (!color) return;
  if (color.indexOf('rgba') === 0) return color.replace(/\d?\.?\d*\s*\)\s*$/, (0.1 * multiplier).toString() + ')');
  if (color.indexOf('rgb') === 0) return colorUtil.rgbToRgba(color);
  if (color.indexOf('#') === 0) return colorUtil.hexToRgba(color);

};

/**
 * Binds events to the root element for
 */
InkRippleCtrl.prototype.bindEvents = function () {
  this.$element.on('mousedown', angular.bind(this, this.handleMousedown));
  this.$element.on('mouseup touchend', angular.bind(this, this.handleMouseup));
  this.$element.on('mouseleave', angular.bind(this, this.handleMouseup));
  this.$element.on('touchmove', angular.bind(this, this.handleTouchmove));
};

/**
 * Create a new ripple on every mousedown event from the root element
 * @param event {MouseEvent}
 */
InkRippleCtrl.prototype.handleMousedown = function (event) {
  if ( this.mousedown ) return;

  // When jQuery is loaded, we have to get the original event
  if (event.hasOwnProperty('originalEvent')) event = event.originalEvent;
  this.mousedown = true;
  if (this.options.center) {
    this.createRipple(this.container.prop('clientWidth') / 2, this.container.prop('clientWidth') / 2);
  } else {

    // We need to calculate the relative coordinates if the target is a sublayer of the ripple element
    if (event.srcElement !== this.$element[0]) {
      var layerRect = this.$element[0].getBoundingClientRect();
      var layerX = event.clientX - layerRect.left;
      var layerY = event.clientY - layerRect.top;

      this.createRipple(layerX, layerY);
    } else {
      this.createRipple(event.offsetX, event.offsetY);
    }
  }
};

/**
 * Either remove or unlock any remaining ripples when the user mouses off of the element (either by
 * mouseup, touchend or mouseleave event)
 */
InkRippleCtrl.prototype.handleMouseup = function () {
  autoCleanup(this, this.clearRipples);
};

/**
 * Either remove or unlock any remaining ripples when the user mouses off of the element (by
 * touchmove)
 */
InkRippleCtrl.prototype.handleTouchmove = function () {
  autoCleanup(this, this.deleteRipples);
};

/**
 * Cycles through all ripples and attempts to remove them.
 */
InkRippleCtrl.prototype.deleteRipples = function () {
  for (var i = 0; i < this.ripples.length; i++) {
    this.ripples[ i ].remove();
  }
};

/**
 * Cycles through all ripples and attempts to remove them with fade.
 * Depending on logic within `fadeInComplete`, some removals will be postponed.
 */
InkRippleCtrl.prototype.clearRipples = function () {
  for (var i = 0; i < this.ripples.length; i++) {
    this.fadeInComplete(this.ripples[ i ]);
  }
};

/**
 * Creates the ripple container element
 * @returns {*}
 */
InkRippleCtrl.prototype.createContainer = function () {
  var container = angular.element('<div class="md-ripple-container"></div>');
  this.$element.append(container);
  return container;
};

InkRippleCtrl.prototype.clearTimeout = function () {
  if (this.timeout) {
    this.$timeout.cancel(this.timeout);
    this.timeout = null;
  }
};

InkRippleCtrl.prototype.isRippleAllowed = function () {
  var element = this.$element[0];
  do {
    if (!element.tagName || element.tagName === 'BODY') break;

    if (element && angular.isFunction(element.hasAttribute)) {
      if (element.hasAttribute('disabled')) return false;
      if (this.inkRipple() === 'false' || this.inkRipple() === '0') return false;
    }

  } while (element = element.parentNode);
  return true;
};

/**
 * The attribute `md-ink-ripple` may be a static or interpolated
 * color value OR a boolean indicator (used to disable ripples)
 */
InkRippleCtrl.prototype.inkRipple = function () {
  return this.$element.attr('md-ink-ripple');
};

/**
 * Creates a new ripple and adds it to the container.  Also tracks ripple in `this.ripples`.
 * @param left
 * @param top
 */
InkRippleCtrl.prototype.createRipple = function (left, top) {
  if (!this.isRippleAllowed()) return;

  var ctrl        = this;
  var colorUtil   = ctrl.$mdColorUtil;
  var ripple      = angular.element('<div class="md-ripple"></div>');
  var width       = this.$element.prop('clientWidth');
  var height      = this.$element.prop('clientHeight');
  var x           = Math.max(Math.abs(width - left), left) * 2;
  var y           = Math.max(Math.abs(height - top), top) * 2;
  var size        = getSize(this.options.fitRipple, x, y);
  var color       = this.calculateColor();

  ripple.css({
    left:            left + 'px',
    top:             top + 'px',
    background:      'black',
    width:           size + 'px',
    height:          size + 'px',
    backgroundColor: colorUtil.rgbaToRgb(color),
    borderColor:     colorUtil.rgbaToRgb(color)
  });
  this.lastRipple = ripple;

  // we only want one timeout to be running at a time
  this.clearTimeout();
  this.timeout    = this.$timeout(function () {
    ctrl.clearTimeout();
    if (!ctrl.mousedown) ctrl.fadeInComplete(ripple);
  }, DURATION * 0.35, false);

  if (this.options.dimBackground) this.container.css({ backgroundColor: color });
  this.container.append(ripple);
  this.ripples.push(ripple);
  ripple.addClass('md-ripple-placed');

  this.$mdUtil.nextTick(function () {

    ripple.addClass('md-ripple-scaled md-ripple-active');
    ctrl.$timeout(function () {
      ctrl.clearRipples();
    }, DURATION, false);

  }, false);

  function getSize (fit, x, y) {
    return fit
        ? Math.max(x, y)
        : Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
  }
};



/**
 * After fadeIn finishes, either kicks off the fade-out animation or queues the element for removal on mouseup
 * @param ripple
 */
InkRippleCtrl.prototype.fadeInComplete = function (ripple) {
  if (this.lastRipple === ripple) {
    if (!this.timeout && !this.mousedown) {
      this.removeRipple(ripple);
    }
  } else {
    this.removeRipple(ripple);
  }
};

/**
 * Kicks off the animation for removing a ripple
 * @param ripple {Element}
 */
InkRippleCtrl.prototype.removeRipple = function (ripple) {
  var ctrl  = this;
  var index = this.ripples.indexOf(ripple);
  if (index < 0) return;
  this.ripples.splice(this.ripples.indexOf(ripple), 1);
  ripple.removeClass('md-ripple-active');
  ripple.addClass('md-ripple-remove');
  if (this.ripples.length === 0) this.container.css({ backgroundColor: '' });
  // use a 2-second timeout in order to allow for the animation to finish
  // we don't actually care how long the animation takes
  this.$timeout(function () {
    ctrl.fadeOutComplete(ripple);
  }, DURATION, false);
};

/**
 * Removes the provided ripple from the DOM
 * @param ripple
 */
InkRippleCtrl.prototype.fadeOutComplete = function (ripple) {
  ripple.remove();
  this.lastRipple = null;
};

/**
 * Used to create an empty directive.  This is used to track flag-directives whose children may have
 * functionality based on them.
 *
 * Example: `md-no-ink` will potentially be used by all child directives.
 */
function attrNoDirective () {
  return { controller: angular.noop };
}
