var SmartAnnotation = (function() {
  'use strict';

  // utilities
  var Util = (function() {
    // helper method that binds show/hidden action
    function showHideBinding() {
      $.each(['show', 'hide'], function (i, ev) {
        var el = $.fn[ev];
        $.fn[ev] = function () {
          this.trigger(ev);
          return el.apply(this, arguments);
        };
      });
    }

    var publicApi = {
      showHideBinding: showHideBinding
    };

    return publicApi;
  })();

  function setAtWho(field) {
    var dataUserUrl,
        dataTaskUrl,
        dataProjectUrl,
        dataExperimentUrl,
        dataSampleUrl,
        dataMenuItemsUrl;

    dataUserUrl = $(document.body).attr('data-atwho-users-url');
    dataTaskUrl = $(document.body).attr('data-atwho-task-url');
    dataProjectUrl = $(document.body).attr('data-atwho-project-url');
    dataExperimentUrl = $(document.body).attr('data-atwho-experiment-url');
    dataSampleUrl = $(document.body).attr('data-atwho-sample-url');
    dataMenuItemsUrl = $(document.body).attr('data-atwho-menu-items').freeze;

    // helper methods for AtWho callback
    function _templateEval(_tpl, map) {
      var res;
      try {
        res = generateTemplate(map);
      } catch (_error) {
        res = '';
      }
      return res;
    }

    function _matchHighlighter(li, query, search_filter) {
      var re, li2, prevVal, newVal;
      if (!query) {
        return li;
      }
      resourcesChecker(query, search_filter);
      li2 = $(li);
      re = new RegExp(query, 'gi');
    prevVal =
        li2
        .find('[data-val=name]')
        .html();
      newVal =
        prevVal
        .replace(re, '<strong>$&</strong>');
      li2.find('[data-val=name]').html(newVal);
      newVal =
        prevVal
        .replace(re, '<strong>$&</strong>');
      li2.find('[data-val=email]').html(newVal);
      return li2[0].outerHTML;
    }

    function _genrateInputTag(value, li) {
      var res = '';
      res += '[#' + li.attr('data-name');
      res += '~' + li.attr('data-type');
      res += '~' + li.attr('data-id') + ']';
      return res;
    }

    // check if query has some hits and disables the buttons without it
    function resourcesChecker(query, search_filter) {
      var src_btn, $element;

      switch (search_filter) {
        case 'task#':
          src_btn = 'tsk';
          break;
        case 'project#':
          src_btn = 'prj';
          break;
        case 'experiment#':
          src_btn = 'exp';
          break;
        default:
          src_btn = 'sam';
          break;
      }
      $.getJSON(
        dataMenuItemsUrl,
        {query: query},
        function(data){
          if(data) {
            _.each($('.atwho-header-res .title .btn'), function(el) {
              $element = $(el);
              if(data[$element.data('filter')].length === 0) {
                $element.prop('disabled', true);
                $element
                  .removeClass('btn-primary')
                  .addClass('btn-default');
                $('[data-filter="' + src_btn +'"]')
                  .removeClass('btn-default')
                  .addClass('btn-primary');
              } else {
                $element.prop('disabled', false);
                if($element.data('filter') == src_btn) {
                  $element
                    .removeClass('btn-default')
                    .addClass('btn-primary');
                } else {
                  $element
                    .removeClass('btn-primary')
                    .addClass('btn-default');
                }
              }
            });
          }
        });
    }

    // reset the dropdown
    function reinitializeOnListHide() {
      Util.showHideBinding();

      _.map($('.atwho-view'), function(el) {
        $(el).off('hide');
        $(el).on('hide', function() {
          $(field).atwho('destroy');
          init();
        });
      });
    }

    // initialise dropdown dismiss button
    function initDismissButton() {
      $('.atwho-header-res .dismiss').off('click');
      $('.atwho-header-res .dismiss').on('click', function() {
        $(field).atwho('destroy');
        init();
      });
    }

    // Initialize filter buttons
    function initButtons(query, search_filter) {
      $('.atwho-header-res query_obj button').off();
      $('.atwho-header-res .dismiss').off('click');

      initDismissButton();

      resourcesChecker(query, search_filter);
      $('.atwho-header-res .title button').on('click', function(e) {
        var $button, $prevButton;
        e.stopPropagation();

        $button = $(this);
        $prevButton = $button.closest('.title').children('.btn-primary');

        switch ($button.attr('data-filter')) {
          case 'prj':
              generateNewQuery(dataProjectUrl,
                               $prevButton,
                               $button);
            break;
          case 'exp':
              generateNewQuery(dataExperimentUrl,
                               $prevButton,
                               $button);
            break;
          case 'tsk':
              generateNewQuery(dataTaskUrl,
                               $prevButton,
                               $button);
            break;
          case 'sam':
              generateNewQuery(dataSampleUrl,
                               $prevButton,
                               $button);
            break;
        }
      });
    }

    // Generates new query when user filters the results
    function generateNewQuery(link, prevBtn, selectedBtn) {
      var regexp, _a, _y, new_query, query_obj, field_selected;
      _a = decodeURI("%C3%80");
      _y = decodeURI("%C3%BF");
      regexp = new RegExp("(#|task#|project#|sample#|experiment#)([A-Za-z" +
      _a + "-" + _y + "0-9_ \'\.\+\-]*)$|" +
      "(#|task#|project#|sample#|experiment#)([^\\x00-\\xff]*)$", 'gi');
      // filters field if multiple input fields on the page
      _.each($(field), function(e) {
        if($(e).atwho('isSelecting')){
          field_selected = e;
      }});

      if(field_selected) {
        query_obj = regexp.exec($(field_selected).val());

        if(query_obj) {
          $.getJSON(
            link,
            {query: query_obj[2]},
            function(data) {
              if(data.res.length > 0 && field_selected) {
                $(field_selected)
                  .atwho('load', query_obj[0], data.res)
                  .atwho('run');

                prevBtn
                  .removeClass('btn-primary')
                  .addClass('btn-default');
                selectedBtn
                  .removeClass('btn-default')
                  .addClass('btn-primary');

                reinitializeOnListHide();
                initButtons(query_obj[2],
                            selectedBtn.html());
              } else {
                $(field).atwho('destroy');
                init();
              }
          });
        }
      }
    }

    // Generates suggestion dropdown filter
    function generateFilterMenu(active, res_data) {
      var header = '<div class="atwho-header-res">' +
       '<div class="title">' +
       '<button data-filter="prj" class="btn btn-xs ' +
       (active === 'prj' ? 'btn-primary' : 'btn-default') + '">project#</button>' +
       '<button data-filter="exp" class="btn btn-xs ' +
       (active === 'exp' ? 'btn-primary' : 'btn-default') + '">experiment#</button>' +
       '<button data-filter="tsk" class="btn btn-xs ' +
       (active === 'tsk' ? 'btn-primary' : 'btn-default') + '">task#</button>' +
       '<button data-filter="sam" class="btn btn-xs ' +
       (active === 'sam' ? 'btn-primary' : 'btn-default') + '">sample#</button>' +
       '</div>' +
       '<div class="help">' +
       '<div>' +
       '<strong><%= I18n.t("atwho.users.navigate_1") %></strong> ' +
       '<%= I18n.t("atwho.users.navigate_2") %>' +
       '</div>' +
       '<div><strong><%= I18n.t("atwho.users.confirm_1") %></strong> ' +
       '<%= I18n.t("atwho.users.confirm_2") %>' +
       '</div>' +
       '<div>' +
       '<strong><%= I18n.t("atwho.users.dismiss_1") %></strong> ' +
       '<%= I18n.t("atwho.users.dismiss_2") %>' +
       '</div>' +
       '<div class="dismiss">' +
       '<span class="glyphicon glyphicon-remove"></span>' +
       '</div>' +
       '</div>' +
       '</div>';

      return header;
    }

    // Generates resources list items
    function generateTemplate(map) {
      var res = '';
      res += '<li class="atwho-li atwho-li-res" data-name="' +
              map.name + '" data-id="' + map.id + '" data-type="' +
              map.type + '">';
      switch(map.type) {
          case 'tsk':
              res += '<span data-type class="res-type">' + map.type + '</span>';
              break;
          case 'prj':
              res += '<span data-type class="res-type">' + map.type + '</span>';
              break;
          case 'exp':
              res += '<span data-type class="res-type">' + map.type + '</span>';
              break;
          case 'sam':
              res += '<span class="glyphicon glyphicon-tint"></span>';
              break;
      }

      res += '&nbsp;';
      res += '<span data-val="name" class="res-name">';
      res += map.name;
      res += '</span>';
      if(map.archived) {
        res += '<%= I18n.t("atwho.res.archived") %></span>';
      } else {
        res += '</span>';
      }
      res += '&nbsp;';

      switch (map.type) {
        case 'tsk':

          res += '<span class="res-description">&lt; ' + map.experimentName +
                 ' &lt; ' + map.projectName + '</span>';
          break;
        case 'exp':
          res += '<span class="res-description">&lt; ' + map.projectName + '</span>';
          break;
        case 'sam':
          res += '<span class="res-description">' + map.description + '</span>';
          break;
      }

      res += '</li>';
      return res;
    }

    function init() {
      $(field)
      .atwho({
        at: '@',
        callbacks: {
          remoteFilter: function(query, callback) {
            $.getJSON(
              dataUserUrl,
              {query: query},
              function(data) {
                callback(data.users);
                initDismissButton();
              }
            );
          },
          sorter: function(query, items, _searchKey) {
            // Sorting is already done on server-side
            return items;
          },
          tplEval: function(_tpl, map) {
            var res;
            try {
              res = '';
              res += '<li class="atwho-li atwho-li-user" ';
              res += 'data-id="' + map.id + '" ';
              res += 'data-full-name="' + map.full_name + '">';
              res += '<img src="' + map.img_url + '" class="avatar" />';
              res += '<span data-val="full-name">';
              res += map.full_name;
              res += '</span>';
              res += '<small>';
              res += '&nbsp;';
              res += '&#183;';
              res += '&nbsp;';
              res += '<span data-val="email">';
              res += map.email;
              res += '</span>';
              res += '</small>';
              res += '</li>';
            } catch (_error) {
              res = '';
            }
            return res;
          },
          highlighter: function(li, query) {
            function highlight(el, sel, re) {
              var prevVal = el.find(sel).html();
              var newVal = prevVal.replace(re, '<strong>$&</strong>');
              el.find(sel).html(newVal);
            }

            if (!query) {
              return li;
            }

            var $li = $(li);
            var re = new RegExp(query, 'gi');
            highlight($li, '[data-val=full-name]', re);
            highlight($li, '[data-val=email]', re);
            return $li[0].outerHTML;
          },
          beforeInsert: function(value, li) {
            var res = '';
            res += '[@' + li.attr('data-full-name');
            res += '~' + li.attr('data-id') + ']';
            return res;
          }
        },
        headerTpl:
          '<div class="atwho-header-res">' +
          '<div class="title title-user"><%= I18n.t("atwho.users.title") %></div>' +
          '<div class="help">' +
          '<div>' +
          '<strong><%= I18n.t("atwho.users.navigate_1") %></strong> ' +
          '<%= I18n.t("atwho.users.navigate_2") %>' +
          '</div>' +
          '<div>' +
          '<strong><%= I18n.t("atwho.users.confirm_1") %></strong> ' +
          '<%= I18n.t("atwho.users.confirm_2") %>' +
          '</div>' +
          '<div>' +
          '<strong><%= I18n.t("atwho.users.dismiss_1") %></strong> ' +
          '<%= I18n.t("atwho.users.dismiss_2") %>' +
          '</div>' +
          '<div class="dismiss">' +
          '<span class="glyphicon glyphicon-remove"></span>' +
          '</div>' +
          '</div>' +
          '</div>',
        limit: <%= Constants::ATWHO_SEARCH_LIMIT %>,
        startsWithSpace: true,
        acceptSpaceBar: true,
        displayTimeout: 120000
      })
      .atwho({
        at: '#',
        callbacks: {
          remoteFilter: function(query, callback) {
            $.getJSON(
              dataSampleUrl,
              {query: query},
              function(data) {
                callback(data.res);
                initButtons(query);
              }
            );
          },
          tplEval: function(_tpl, map) {
            return _templateEval(_tpl, map);
          },
          highlighter:  function(li, query) {
            return _matchHighlighter(li, query, '#');
          },
          beforeInsert: function(value, li) {
            return _genrateInputTag(value, li);
          }
        },
        headerTpl: generateFilterMenu('sam'),
        limit: <%= Constants::ATWHO_SEARCH_LIMIT %>,
        startWithSpace: true,
        acceptSpaceBar: true,
        displayTimeout: 120000
      })
      .atwho({
        at: 'task#',
        callbacks: {
          remoteFilter: function(query, callback) {
            $.getJSON(
              dataTaskUrl,
              {query: query},
              function(data) {
                callback(data.res);
                initButtons(query, 'task#');
              }
            );
          },
          tplEval: function(_tpl, map) {
            return _templateEval(_tpl, map);
          },
          highlighter: function(li, query) {
            return _matchHighlighter(li, query, 'task#');
          },
          beforeInsert: function(value, li) {
            return _genrateInputTag(value, li);
          }
        },
        headerTpl: generateFilterMenu('tsk'),
        limit: <%= Constants::ATWHO_SEARCH_LIMIT %>,
        startWithSpace: true,
        acceptSpaceBar: true,
        displayTimeout: 120000
      })
      .atwho({
        at: 'project#',
        callbacks: {
          remoteFilter: function(query, callback) {
            $.getJSON(
              dataProjectUrl,
              {query: query},
              function(data) {
                callback(data.res);
                initButtons(query, 'project#');
              }
            );
          },
          tplEval: function(_tpl, map) {
            return _templateEval(_tpl, map);
          },
          highlighter: function(li, query) {
            return _matchHighlighter(li, query, 'project#');
          },
          beforeInsert: function(value, li) {
            return _genrateInputTag(value, li);
          }
        },
        headerTpl: generateFilterMenu('prj'),
        limit: <%= Constants::ATWHO_SEARCH_LIMIT %>,
        startWithSpace: true,
        acceptSpaceBar: true,
        displayTimeout: 120000
      })
      .atwho({
        at: 'experiment#',
        callbacks: {
          remoteFilter: function(query, callback) {
            $.getJSON(
              dataExperimentUrl,
              {query: query},
              function(data) {
                callback(data.res);
                initButtons(query, 'experiment#');
              }
            );
          },
          tplEval: function(_tpl, map) {
            return _templateEval(_tpl, map);
          },
          highlighter: function(li, query) {
            return _matchHighlighter(li, query, 'experiment#');
          },
          beforeInsert: function(value, li) {
            return _genrateInputTag(value, li);
          }
        },
        headerTpl: generateFilterMenu('exp'),
        limit: <%= Constants::ATWHO_SEARCH_LIMIT %>,
        startWithSpace: true,
        acceptSpaceBar: true,
        displayTimeout: 120000
      })
      .atwho({
        at: 'sample#',
        callbacks: {
          remoteFilter: function(query, callback) {
            $.getJSON(
              dataSampleUrl,
              {query: query},
              function(data) {
                callback(data.res);
                initButtons(query);
              }
            );
          },
          tplEval: function(_tpl, map) {
            return _templateEval(_tpl, map);
          },
          highlighter: function(li, query) {
            return _matchHighlighter(li, query, 'sample#');
          },
          beforeInsert: function(value, li) {
            return _genrateInputTag(value, li);
          }
        },
        headerTpl: generateFilterMenu('sam'),
        limit: <%= Constants::ATWHO_SEARCH_LIMIT %>,
        startWithSpace: true,
        acceptSpaceBar: true,
        displayTimeout: 120000
      });
    }

    return {
      init: init
    };
  }

  function initialize(field) {
    var atWho = new setAtWho(field);
    atWho.init();
  }

  var publicApi = {
    init: initialize
  };

  return publicApi;

})();