/**
 * angular-strap
 * @version v2.1.1 - 2014-09-26
 * @link http://mgcrea.github.io/angular-strap
 * @author Olivier Louvignes (olivier@mg-crea.com)
 * @license MIT License, http://www.opensource.org/licenses/MIT
 */
'use strict';

angular.module('mgcrea.ngStrap.helpers.dimensions', [])

  .factory('dimensions', ["$document", "$window", function($document, $window) {

    var jqLite = angular.element;
    var fn = {};

    /**
     * Test the element nodeName
     * @param element
     * @param name
     */
    var nodeName = fn.nodeName = function(element, name) {
      return element.nodeName && element.nodeName.toLowerCase() === name.toLowerCase();
    };

    /**
     * Returns the element computed style
     * @param element
     * @param prop
     * @param extra
     */
    fn.css = function(element, prop, extra) {
      var value;
      if (element.currentStyle) { //IE
        value = element.currentStyle[prop];
      } else if (window.getComputedStyle) {
        value = window.getComputedStyle(element)[prop];
      } else {
        value = element.style[prop];
      }
      return extra === true ? parseFloat(value) || 0 : value;
    };

    /**
     * Provides read-only equivalent of jQuery's offset function:
     * @required-by bootstrap-tooltip, bootstrap-affix
     * @url http://api.jquery.com/offset/
     * @param element
     */
    fn.offset = function(element) {
      var boxRect = element.getBoundingClientRect();
      var docElement = element.ownerDocument;
      return {
        width: boxRect.width || element.offsetWidth,
        height: boxRect.height || element.offsetHeight,
        top: boxRect.top + (window.pageYOffset || docElement.documentElement.scrollTop) - (docElement.documentElement.clientTop || 0),
        left: boxRect.left + (window.pageXOffset || docElement.documentElement.scrollLeft) - (docElement.documentElement.clientLeft || 0)
      };
    };

    /**
     * Provides read-only equivalent of jQuery's position function
     * @required-by bootstrap-tooltip, bootstrap-affix
     * @url http://api.jquery.com/offset/
     * @param element
     */
    fn.position = function(element) {

      var offsetParentRect = {top: 0, left: 0},
          offsetParentElement,
          offset;

      // Fixed elements are offset from window (parentOffset = {top:0, left: 0}, because it is it's only offset parent
      if (fn.css(element, 'position') === 'fixed') {

        // We assume that getBoundingClientRect is available when computed position is fixed
        offset = element.getBoundingClientRect();

      } else {

        // Get *real* offsetParentElement
        offsetParentElement = offsetParent(element);
        offset = fn.offset(element);

        // Get correct offsets
        offset = fn.offset(element);
        if (!nodeName(offsetParentElement, 'html')) {
          offsetParentRect = fn.offset(offsetParentElement);
        }

        // Add offsetParent borders
        offsetParentRect.top += fn.css(offsetParentElement, 'borderTopWidth', true);
        offsetParentRect.left += fn.css(offsetParentElement, 'borderLeftWidth', true);
      }

      // Subtract parent offsets and element margins
      return {
        width: element.offsetWidth,
        height: element.offsetHeight,
        top: offset.top - offsetParentRect.top - fn.css(element, 'marginTop', true),
        left: offset.left - offsetParentRect.left - fn.css(element, 'marginLeft', true)
      };

    };

    /**
     * Returns the closest, non-statically positioned offsetParent of a given element
     * @required-by fn.position
     * @param element
     */
    var offsetParent = function offsetParentElement(element) {
      var docElement = element.ownerDocument;
      var offsetParent = element.offsetParent || docElement;
      if(nodeName(offsetParent, '#document')) return docElement.documentElement;
      while(offsetParent && !nodeName(offsetParent, 'html') && fn.css(offsetParent, 'position') === 'static') {
        offsetParent = offsetParent.offsetParent;
      }
      return offsetParent || docElement.documentElement;
    };

    /**
     * Provides equivalent of jQuery's height function
     * @required-by bootstrap-affix
     * @url http://api.jquery.com/height/
     * @param element
     * @param outer
     */
    fn.height = function(element, outer) {
      var value = element.offsetHeight;
      if(outer) {
        value += fn.css(element, 'marginTop', true) + fn.css(element, 'marginBottom', true);
      } else {
        value -= fn.css(element, 'paddingTop', true) + fn.css(element, 'paddingBottom', true) + fn.css(element, 'borderTopWidth', true) + fn.css(element, 'borderBottomWidth', true);
      }
      return value;
    };

    /**
     * Provides equivalent of jQuery's width function
     * @required-by bootstrap-affix
     * @url http://api.jquery.com/width/
     * @param element
     * @param outer
     */
    fn.width = function(element, outer) {
      var value = element.offsetWidth;
      if(outer) {
        value += fn.css(element, 'marginLeft', true) + fn.css(element, 'marginRight', true);
      } else {
        value -= fn.css(element, 'paddingLeft', true) + fn.css(element, 'paddingRight', true) + fn.css(element, 'borderLeftWidth', true) + fn.css(element, 'borderRightWidth', true);
      }
      return value;
    };

    return fn;

  }]);
