/**
 * angular-strap
 * @version v2.2.2 - 2015-05-15
 * @link http://mgcrea.github.io/angular-strap
 * @author Olivier Louvignes <olivier@mg-crea.com> (https://github.com/mgcrea)
 * @license MIT License, http://www.opensource.org/licenses/MIT
 */
'use strict';

angular.module('mgcrea.ngStrap.affix', [ 'mgcrea.ngStrap.helpers.dimensions', 'mgcrea.ngStrap.helpers.debounce' ]).provider('$affix', function() {
  var defaults = this.defaults = {
    offsetTop: 'auto',
    inlineStyles: true
  };
  this.$get = [ '$window', 'debounce', 'dimensions', function($window, debounce, dimensions) {
    var bodyEl = angular.element($window.document.body);
    var windowEl = angular.element($window);
    function AffixFactory(element, config) {
      var $affix = {};
      var options = angular.extend({}, defaults, config);
      var targetEl = options.target;
      var reset = 'affix affix-top affix-bottom', setWidth = false, initialAffixTop = 0, initialOffsetTop = 0, offsetTop = 0, offsetBottom = 0, affixed = null, unpin = null;
      var parent = element.parent();
      if (options.offsetParent) {
        if (options.offsetParent.match(/^\d+$/)) {
          for (var i = 0; i < options.offsetParent * 1 - 1; i++) {
            parent = parent.parent();
          }
        } else {
          parent = angular.element(options.offsetParent);
        }
      }
      $affix.init = function() {
        this.$parseOffsets();
        initialOffsetTop = dimensions.offset(element[0]).top + initialAffixTop;
        setWidth = !element[0].style.width;
        targetEl.on('scroll', this.checkPosition);
        targetEl.on('click', this.checkPositionWithEventLoop);
        windowEl.on('resize', this.$debouncedOnResize);
        this.checkPosition();
        this.checkPositionWithEventLoop();
      };
      $affix.destroy = function() {
        targetEl.off('scroll', this.checkPosition);
        targetEl.off('click', this.checkPositionWithEventLoop);
        windowEl.off('resize', this.$debouncedOnResize);
      };
      $affix.checkPositionWithEventLoop = function() {
        setTimeout($affix.checkPosition, 1);
      };
      $affix.checkPosition = function() {
        var scrollTop = getScrollTop();
        var position = dimensions.offset(element[0]);
        var elementHeight = dimensions.height(element[0]);
        var affix = getRequiredAffixClass(unpin, position, elementHeight);
        if (affixed === affix) return;
        affixed = affix;
        element.removeClass(reset).addClass('affix' + (affix !== 'middle' ? '-' + affix : ''));
        if (affix === 'top') {
          unpin = null;
          if (setWidth) {
            element.css('width', '');
          }
          if (options.inlineStyles) {
            element.css('position', options.offsetParent ? '' : 'relative');
            element.css('top', '');
          }
        } else if (affix === 'bottom') {
          if (options.offsetUnpin) {
            unpin = -(options.offsetUnpin * 1);
          } else {
            unpin = position.top - scrollTop;
          }
          if (setWidth) {
            element.css('width', '');
          }
          if (options.inlineStyles) {
            element.css('position', options.offsetParent ? '' : 'relative');
            element.css('top', options.offsetParent ? '' : bodyEl[0].offsetHeight - offsetBottom - elementHeight - initialOffsetTop + 'px');
          }
        } else {
          unpin = null;
          if (setWidth) {
            element.css('width', element[0].offsetWidth + 'px');
          }
          if (options.inlineStyles) {
            element.css('position', 'fixed');
            element.css('top', initialAffixTop + 'px');
          }
        }
      };
      $affix.$onResize = function() {
        $affix.$parseOffsets();
        $affix.checkPosition();
      };
      $affix.$debouncedOnResize = debounce($affix.$onResize, 50);
      $affix.$parseOffsets = function() {
        var initialPosition = element.css('position');
        if (options.inlineStyles) {
          element.css('position', options.offsetParent ? '' : 'relative');
        }
        if (options.offsetTop) {
          if (options.offsetTop === 'auto') {
            options.offsetTop = '+0';
          }
          if (options.offsetTop.match(/^[-+]\d+$/)) {
            initialAffixTop = -options.offsetTop * 1;
            if (options.offsetParent) {
              offsetTop = dimensions.offset(parent[0]).top + options.offsetTop * 1;
            } else {
              offsetTop = dimensions.offset(element[0]).top - dimensions.css(element[0], 'marginTop', true) + options.offsetTop * 1;
            }
          } else {
            offsetTop = options.offsetTop * 1;
          }
        }
        if (options.offsetBottom) {
          if (options.offsetParent && options.offsetBottom.match(/^[-+]\d+$/)) {
            offsetBottom = getScrollHeight() - (dimensions.offset(parent[0]).top + dimensions.height(parent[0])) + options.offsetBottom * 1 + 1;
          } else {
            offsetBottom = options.offsetBottom * 1;
          }
        }
        if (options.inlineStyles) {
          element.css('position', initialPosition);
        }
      };
      function getRequiredAffixClass(unpin, position, elementHeight) {
        var scrollTop = getScrollTop();
        var scrollHeight = getScrollHeight();
        if (scrollTop <= offsetTop) {
          return 'top';
        } else if (unpin !== null && scrollTop + unpin <= position.top) {
          return 'middle';
        } else if (offsetBottom !== null && position.top + elementHeight + initialAffixTop >= scrollHeight - offsetBottom) {
          return 'bottom';
        } else {
          return 'middle';
        }
      }
      function getScrollTop() {
        return targetEl[0] === $window ? $window.pageYOffset : targetEl[0].scrollTop;
      }
      function getScrollHeight() {
        return targetEl[0] === $window ? $window.document.body.scrollHeight : targetEl[0].scrollHeight;
      }
      $affix.init();
      return $affix;
    }
    return AffixFactory;
  } ];
}).directive('bsAffix', [ '$affix', '$window', function($affix, $window) {
  return {
    restrict: 'EAC',
    require: '^?bsAffixTarget',
    link: function postLink(scope, element, attr, affixTarget) {
      var options = {
        scope: scope,
        target: affixTarget ? affixTarget.$element : angular.element($window)
      };
      angular.forEach([ 'offsetTop', 'offsetBottom', 'offsetParent', 'offsetUnpin', 'inlineStyles' ], function(key) {
        if (angular.isDefined(attr[key])) {
          var option = attr[key];
          if (/true/i.test(option)) option = true;
          if (/false/i.test(option)) option = false;
          options[key] = option;
        }
      });
      var affix = $affix(element, options);
      scope.$on('$destroy', function() {
        affix && affix.destroy();
        options = null;
        affix = null;
      });
    }
  };
} ]).directive('bsAffixTarget', function() {
  return {
    controller: [ '$element', function($element) {
      this.$element = $element;
    } ]
  };
});