angular.module("customFilters", [])
  .filter("unique", function () {
    return function (data, propertyName) {
      if (angular.isArray(data) && angular.isString(propertyName)) {
        var results = [];
        var keys = {};
        
        
        angular.forEach(data, function(property) {
          var val = property[propertyName];
          
          if (angular.isUndefined(keys[val])) {
            keys[val] = true;
            results.push(val);
          }
        });
         
        return results;
      }
      else
        return data;
    }
  })
  .filter("range", function ($filter) { 
    return function (data, page, size) {
      if (angular.isArray(data) && angular.isNumber(page) && angular.isNumber(size)) {
        var start_index = (page - 1)*size;
        return (data.length < start_index) ? [] : $filter('limitTo')(data.splice(start_index), size);
      }
      return data;
    }
  })

  .filter("pageCount", function() {
    return function (data, size) {
      if (angular.isArray(data)) {
        var result = [];
        for (var i=0; i<Math.ceil(data.length/size); i++) {
          result.push(i);
        }
        return result;
      }
      else
        return data;
    }
  });