//= require jquery-ui/widgets/sortable

// Extend datatables API with searchable options
// (http://stackoverflow.com/questions/39912395/datatables-dynamically-set-columns-searchable)
$.fn.dataTable.Api.register('isColumnSearchable()', function(colSelector) {
  var idx = this.column(colSelector).index();
  return this.settings()[0].aoColumns[idx].bSearchable;
});
$.fn.dataTable.Api
  .register('setColumnSearchable()', function(colSelector, value) {
    if (value !== this.isColumnSearchable(colSelector)) {
      var idx = this.column(colSelector).index();
      this.settings()[0].aoColumns[idx].bSearchable = value;
      if (value === true) {
        this.rows().invalidate();
      }
    }
    return value;
  });

var rowsSelected = [];

// Tells whether we're currently viewing or editing table
var currentMode = 'viewMode';

// Tells what action will execute by pressing on save button (update/create)
var saveAction = 'update';
var selectedRecord;

// Helps saving correct table state
var myData;
var loadFirstTime = true;

var table;
var originalHeader;

// Tells whether to filter only assigned repository records
var viewAssigned;

function dataTableInit() {
  // Make a copy of original repository table header
  originalHeader = $('#repository-table thead').children().clone();
  viewAssigned = 'assigned';
  table = $('#repository-table').DataTable({
    order: [[2, 'desc']],
    dom: "R<'row'<'col-sm-9-custom toolbar'l><'col-sm-3-custom'f>>tpi",
    stateSave: true,
    processing: true,
    serverSide: true,
    sScrollX: '100%',
    sScrollXInner: '100%',
    scrollY: '64vh',
    scrollCollapse: true,
    colReorder: {
      fixedColumnsLeft: 2,
      realtime: false
    },
    destroy: true,
    ajax: {
      url: $('#repository-table').data('source'),
      data: function(d) {
        d.assigned = viewAssigned;
      },
      global: false,
      type: 'POST'
    },
    columnDefs: [{
      targets: 0,
      searchable: false,
      orderable: false,
      className: 'dt-body-center',
      sWidth: '1%',
      render: function() {
        return "<input class='repository-row-selector' type='checkbox'>";
      }
    }, {
      targets: 1,
      searchable: false,
      orderable: true,
      sWidth: '1%'
    }],
    rowCallback: function(row, data) {
      // Get row ID
      var rowId = data.DT_RowId;

      // If row ID is in the list of selected row IDs
      if ($.inArray(rowId, rowsSelected) !== -1) {
        $(row).find('input[type="checkbox"]').prop('checked', true);
        $(row).addClass('selected');
      }
    },
    columns: (function() {
      var numOfColumns = $('#repository-table').data('num-columns');
      var columns = [];
      for (var i = 0; i < numOfColumns; i++) {
        var visible = (i <= 4);
        var searchable = (i > 0 && i <= 4);
        columns.push({
          data: String(i),
          defaultContent: '',
          visible: visible,
          searchable: searchable
        });
      }
      return columns;
    })(),
    fnDrawCallback: function() {
      animateSpinner(this, false);
      changeToViewMode();
      updateButtons();
      updateDataTableSelectAllCtrl(table);
      // Prevent row toggling when selecting user smart annotation link
      SmartAnnotation.preventPropagation('.atwho-user-popover');

      // Show number of selected rows near pages info
      $('#repository-table_info').append('<span id="selected_info"></span>');
      $('#selected_info').html(' (' +
                               rowsSelected.length +
                               ' entries selected)');
      initRowSelection();
      initHeaderTooltip();
    },
    preDrawCallback: function() {
      animateSpinner(this);
    },
    stateLoadCallback: function() {
      // Send an Ajax request to the server to get the data. Note that
      // this is a synchronous request since the data is expected back from the
      // function
      var repositoryId = $('#repository-table').data('repository-id');
      $.ajax({
        url: '/repositories/' + repositoryId + '/state_load',
        data: {},
        async: false,
        dataType: 'json',
        type: 'POST',
        success: function(json) {
          myData = json.state;
        }
      });
      return myData;
    },
    stateSaveCallback: function(settings, data) {
      // Send an Ajax request to the server with the state object
      var repositoryId = $('#repository-table').data('repository-id');
      // Save correct data
      if (loadFirstTime === true) {
        data = myData;
      }
      $.ajax({
        async: false,
        url: '/repositories/' + repositoryId + '/state_save',
        data: {state: data},
        dataType: 'json',
        type: 'POST'
      });
      loadFirstTime = false;
      initHeaderTooltip();
    },
    fnInitComplete: function(oSettings) {
      // Reload correct column order and visibility (if you refresh page)
      // First two columns are fixed
      table.column(0).visible(true);
      table.column(1).visible(true);
      for (var i = 2; i < table.columns()[0].length; i++) {
        var visibility = false;
        if (myData.columns[i]) {
          visibility = myData.columns[i].visible;
        }
        if (typeof (visibility) === 'string') {
          visibility = (visibility === 'true');
        }
        table.column(i).visible(visibility);
        table.setColumnSearchable(i, visibility);
      }
      oSettings._colReorder.fnOrder(myData.ColReorder);
      table.on('mousedown', function() {
        $('#repository-columns-dropdown').removeClass('open');
      });
      initHeaderTooltip();
      initRowSelection();
    }
  });

  // Append button to inner toolbar in table
  $('div.toolbarButtons').appendTo('div.toolbar');
  $('div.toolbarButtons').show();

  // Handle click on table cells with checkboxes
  $('#repository-table').on('click', 'tbody td', function(e) {
    if ($(e.target).is('.repository-row-selector')) {
      // Skip if clicking on selector checkbox
      return;
    }
    $(this).parent().find('.repository-row-selector').trigger('click');
  });

  table.on('column-reorder', function() {
    initRowSelection();
  });

  $('#assignRepositories, #unassignRepositories').click(function() {
      animateLoading();
  });

  return table;
}

table = dataTableInit();

// Timeout for table header scrolling
setTimeout(function() {
  table.columns.adjust();
}, 10);

// Enables noSearchHidden plugin
$.fn.dataTable.defaults.noSearchHidden = true;

$('form#form-export').submit(function() {
  var form = this;

  if (currentMode === 'viewMode') {
    // Remove all hidden fields
    $(form).find('input[name=row_ids\\[\\]]').remove();
    $(form).find('input[name=header_ids\\[\\]]').remove();

    // Append visible column information
    $('.active table#repository-table thead tr th').each(function() {
      var th = $(this);
      var val;
      switch ($(th).attr('id')) {
        case 'checkbox':
          val = -1;
          break;
        case 'assigned':
          val = -2;
          break;
        case 'row-name':
          val = -3;
          break;
        case 'added-by':
          val = -4;
          break;
        case 'added-on':
          val = -5;
          break;
        default:
          val = th.attr('id');
      }

      if (val) {
        appendInput(form, val, 'header_ids[]');
      }
    });

    // Append records
    $.each(rowsSelected, function(index, rowId) {
      appendInput(form, rowId, 'row_ids[]');
    });
  }
});

function appendInput(form, val, name) {
  $(form).append(
    $('<input>')
    .attr('type', 'hidden')
    .attr('name', name)
    .val(val)
  );
}

function initRowSelection() {
  // Handle clicks on checkbox
  $('.dt-body-center .repository-row-selector').change(function(e) {
    if (currentMode !== 'viewMode') {
      return false;
    }
    // Get row ID
    var $row = $(this).closest('tr');
    var data = table.row($row).data();
    var rowId = data.DT_RowId;

    // Determine whether row ID is in the list of selected row IDs
    var index = $.inArray(rowId, rowsSelected);

    // If checkbox is checked and row ID is not in list of selected row IDs
    if (this.checked && index === -1) {
      rowsSelected.push(rowId);
    // Otherwise, if checkbox is not checked and row ID is in list of selected row IDs
    } else if (!this.checked && index !== -1) {
      rowsSelected.splice(index, 1);
    }

    if (this.checked) {
      $row.addClass('selected');
    } else {
      $row.removeClass('selected');
    }

    updateDataTableSelectAllCtrl(table);

    e.stopPropagation();
    updateButtons();
    // Update number of selected records info
    $('#selected_info').html(' (' + rowsSelected.length + ' entries selected)');
  });

  // Handle click on "Select all" control
  $('.dataTables_scrollHead input[name="select_all"]').change(function(e) {
    if (this.checked) {
      $('.repository-row-selector:not(:checked)').trigger('click');
    } else {
      $('.repository-row-selector:checked').trigger('click');
    }
    // Prevent click event from propagating to parent
    e.stopPropagation();
  });
}

// Updates "Select all" control in a data table
function updateDataTableSelectAllCtrl(table) {
  var $table = table.table().node();
  var $header = table.table().header();
  var $chkboxAll = $('.repository-row-selector', $table);
  var $chkboxChecked = $('.repository-row-selector:checked', $table);
  var chkboxSelectAll = $('input[name="select_all"]', $header).get(0);

  // If none of the checkboxes are checked
  if ($chkboxChecked.length === 0) {
    chkboxSelectAll.checked = false;
    if ('indeterminate' in chkboxSelectAll) {
      chkboxSelectAll.indeterminate = false;
    }

  // If all of the checkboxes are checked
  } else if ($chkboxChecked.length === $chkboxAll.length) {
    chkboxSelectAll.checked = true;
    if ('indeterminate' in chkboxSelectAll) {
      chkboxSelectAll.indeterminate = false;
    }

  // If some of the checkboxes are checked
  } else {
    chkboxSelectAll.checked = true;
    if ('indeterminate' in chkboxSelectAll) {
      chkboxSelectAll.indeterminate = true;
    }
  }
}

function initHeaderTooltip() {
  // Fix compatibility of fixed table header and column names modal-tooltip
  $('.modal-tooltip').off();
  $('.modal-tooltip').hover(function() {
    var $tooltip = $(this).find('.modal-tooltiptext');
    var offsetLeft = $tooltip.offset().left;
    if ((offsetLeft + 200) > $(window).width()) {
      offsetLeft -= 150;
    }
    var offsetTop = $tooltip.offset().top;
    var width = 200;

    // set tooltip params in the table body
    if ( $(this).parents('#repository-table').length ) {
      offsetLeft = $('#repository-table').offset().left + 100;
      width = $('#repository-table').width() - 200;
    }
    $('body').append($tooltip);
    $tooltip.css('background-color', '#d2d2d2');
    $tooltip.css('border-radius', '6px');
    $tooltip.css('color', '#333');
    $tooltip.css('display', 'block');
    $tooltip.css('left', offsetLeft + 'px');
    $tooltip.css('padding', '5px');
    $tooltip.css('position', 'absolute');
    $tooltip.css('text-align', 'center');
    $tooltip.css('top', offsetTop + 'px');
    $tooltip.css('visibility', 'visible');
    $tooltip.css('width', width + 'px');
    $tooltip.css('word-wrap', 'break-word');
    $tooltip.css('z-index', '4');
    $(this).data('dropdown-tooltip', $tooltip);
  }, function() {
    $(this).append($(this).data('dropdown-tooltip'));
    $(this).data('dropdown-tooltip').removeAttr('style');
  });
}

function onClickAddRecord() {
  changeToEditMode();
  updateButtons();

  saveAction = 'create';
  var tr = document.createElement('tr');
  if (table.column(1).visible() === false) {
    table.column(1).visible(true);
  }
  $('table#repository-table thead tr').children('th').each(function() {
    var th = $(this);
    var td;
    var input;
    if ($(th).attr('id') === 'checkbox') {
      td = createTdElement('');
      $(td).html($('#saveRecord').clone());
      tr.appendChild(td);
    } else if ($(th).attr('id') === 'assigned') {
      td = createTdElement('');
      $(td).html($('#cancelSave').clone());
      tr.appendChild(td);
    } else if ($(th).attr('id') === 'row-name') {
      input = changeToInputField('repository_row', 'name', '');
      tr.appendChild(createTdElement(input));
    } else if ($(th).hasClass('repository-column')) {
      input = changeToInputField('repository_cell', th.attr('id'), '');
      tr.appendChild(createTdElement(input));
    } else {
      // Column we don't care for, just add empty td
      tr.appendChild(createTdElement(''));
    }
  });
  $('table#repository-table').prepend(tr);
  selectedRecord = tr;

  // initialize smart annotation
  _.each($('[data-object="repository_cell"]'), function(el) {
    if (_.isUndefined($(el).data('atwho'))) {
      SmartAnnotation.init(el);
    }
  });
  // Adjust columns width in table header
  adjustTableHeader();
}

(function onClickToggleAssignedRecords() {
  $('.repository-assign-group > .btn').click(function() {
    $('.btn-group > .btn').removeClass('active btn-primary');
    $('.btn-group > .btn').addClass('btn-default');
    $(this).addClass('active btn-primary');
  });

  $('#assigned-repo-records').on('click', function() {
    viewAssigned = 'assigned';
    table.ajax.reload(function() {
      initRowSelection();
    }, false);
  });
  $('#all-repo-records').on('click', function() {
    viewAssigned = 'all';
    table.ajax.reload(function() {
      initRowSelection();
    }, false);
  });
})();

function onClickAssignRecords() {
  animateSpinner();
  $.ajax({
    url: $('#assignRepositoryRecords').data('assign-url'),
    type: 'POST',
    dataType: 'json',
    data: {selected_rows: rowsSelected},
    success: function(data) {
      HelperModule.flashAlertMsg(data.flash, 'success');
      onClickCancel();
      clearRowSelection();
    },
    error: function(data) {
      HelperModule.flashAlertMsg(data.responseJSON.flash, 'danger');
      onClickCancel();
      clearRowSelection();
    }
  });
}

function onClickUnassignRecords() {
  animateSpinner();
  $.ajax({
    url: $('#unassignRepositoryRecords').data('unassign-url'),
    type: 'POST',
    dataType: 'json',
    data: {selected_rows: rowsSelected},
    success: function(data) {
      HelperModule.flashAlertMsg(data.flash, 'success');
      onClickCancel();
      clearRowSelection();
    },
    error: function(data) {
      HelperModule.flashAlertMsg(data.responseJSON.flash, 'danger');
      onClickCancel();
      clearRowSelection();
    }
  });
}

function onClickDeleteRecord() {
  animateSpinner();
  $.ajax({
    url: $('table#repository-table').data('delete-record'),
    type: 'POST',
    dataType: 'json',
    data: {selected_rows: rowsSelected},
    success: function(data) {
      HelperModule.flashAlertMsg(data.flash, data.color);
      rowsSelected = [];
      onClickCancel();
    },
    error: function(e) {
      if (e.status === 403) {
        HelperModule.flashAlertMsg(
          I18n.t('repositories.js.permission_error'), e.responseJSON.style
        );
      }
    }
  });
}

// Edit record
function onClickEdit() {
  if (rowsSelected.length !== 1) {
    return;
  }

  var row = table.row('#' + rowsSelected[0]);
  var node = row.node();
  var rowData = row.data();

  $(node).find('td input').trigger('click');
  selectedRecord = node;

  clearAllErrors();
  changeToEditMode();
  updateButtons();
  saveAction = 'update';

  $.ajax({
    url: rowData.recordEditUrl,
    type: 'GET',
    dataType: 'json',
    success: function(data) {
      if (table.column(1).visible() === false) {
        table.column(1).visible(true);
      }
      // Show save and cancel buttons in first two columns
      $(node).children('td').eq(0).html($('#saveRecord').clone());
      $(node).children('td').eq(1).html($('#cancelSave').clone());

      // Record name column
      var colIndex = getColumnIndex('#row-name');
      if (colIndex) {
        $(node).children('td').eq(colIndex)
               .html(changeToInputField('repository_row', 'name',
                                        data.repository_row.name));
      }

      // Take care of custom cells
      var cells = data.repository_row.repository_cells;
      $(node).children('td').each(function(i) {
        var td = $(this);
        var rawIndex = table.column.index('fromVisible', i);
        var colHeader = table.column(rawIndex).header();
        if ($(colHeader).hasClass('repository-column')) {
          // Check if cell on this record exists
          var cell = cells[$(colHeader).attr('id')];
          if (cell) {
            td.html(changeToInputField('repository_cell',
                                       $(colHeader).attr('id'),
                                       cell.value));
          } else {
            td.html(changeToInputField('repository_cell',
                                       $(colHeader).attr('id'), ''));
          }
        }
      });

      // initialize smart annotation
      SmartAnnotation.init($('[data-object="repository_cell"]'));
      _.each($('[data-object="repository_cell"]'), function(el) {
        if (_.isUndefined($(el).data('atwho'))) {
                SmartAnnotation.init(el);
        }
      });
      // Adjust columns width in table header
      adjustTableHeader();
      updateButtons();
    },
    error: function(e) {
      if (e.status === 403) {
        HelperModule.flashAlertMsg(
          I18n.t('repositories.js.permission_error'), e.responseJSON.style
        );
        changeToViewMode();
        updateButtons();
      }
    }
  });
}

// Save record
function onClickSave() {
  var node;
  var rowData;
  if (saveAction === 'update') {
    var row = table.row(selectedRecord);
    node = row.node();
    rowData = row.data();
  } else if (saveAction === 'create') {
    node = selectedRecord;
  }
  // First fetch all the data in input fields
  var data = {
    request_url: $('#repository-table').data('current-uri'),
    repository_row_id: $(selectedRecord).attr('id'),
    repository_row: {},
    repository_cells: {}
  };

  // Direct record attributes
  // Record name
  data.repository_row.name = $('td input[data-object = repository_row]').val();

  // Custom cells
  $(node).find('td input[data-object = repository_cell]').each(function() {
    // Send data only and only if cell is not empty
    if ($(this).val().trim()) {
      data.repository_cells[$(this).attr('name')] = $(this).val();
    }
  });

  var url;
  var type;
  if (saveAction === 'update') {
    url = rowData.recordUpdateUrl;
    type = 'PUT';
  } else {
    type = 'POST';
    url = $('table#repository-table').data('create-record');
  }
  $.ajax({
    url: url,
    type: type,
    dataType: 'json',
    data: data,
    success: function(data) {
      HelperModule.flashAlertMsg(data.flash, 'success');
      onClickCancel();
    },
    error: function(e) {
      var data = e.responseJSON;
      clearAllErrors();

      if (e.status === 404) {
        HelperModule.flashAlertMsg(
          I18n.t('repositories.js.not_found_error'), 'danger'
        );
        changeToViewMode();
        updateButtons();
      } else if (e.status === 403) {
        HelperModule.flashAlertMsg(
          I18n.t('repositories.js.permission_error'), 'danger'
        );
        changeToViewMode();
        updateButtons();
      } else if (e.status === 400) {
        if (data.default_fields) {
          var defaultFields = data.default_fields;

          // Validate record name
          if (defaultFields.name) {
            var input = $(selectedRecord).find('input[name = name]');

            if (input) {
              input.closest('.form-group').addClass('has-error');
              input.parent().append("<span class='help-block'>" +
                                    defaultFields.name + '<br /></span>');
            }
          }
        }

        // Validate custom cells
        $.each(data.repository_cells || [], function(key, val) {
          $.each(val, function(key, val) {
            var input = $(selectedRecord).find('input[name=' + key + ']');
            if (input) {
              input.closest('.form-group').addClass('has-error');
              input.parent().append("<span class='help-block'>" +
                                    val.data[0] + '<br /></span>');
            }
          });
        });
      }
    }
  });
}

// Enable/disable edit button
function updateButtons() {
  if (currentMode === 'viewMode') {
    $('#addRepositoryRecord').removeClass('disabled');
    $('#addRepositoryRecord').prop('disabled', false);
    $('#addNewColumn').removeClass('disabled');
    $('#addNewColumn').prop('disabled', false);
    $('#repository-columns-dropdown')
      .find('.dropdown-toggle')
      .prop('disabled', false);
    $('th').removeClass('disable-click');
    $('.repository-row-selector').removeClass('disabled');
    $('.repository-row-selector').prop('disabled', false);
    if (rowsSelected.length === 0) {
      $('#editRepositoryRecord').prop('disabled', true);
      $('#editRepositoryRecord').addClass('disabled');
      $('#deleteRepositoryRecordsButton').prop('disabled', true);
      $('#deleteRepositoryRecordsButton').addClass('disabled');
      $('#exportRepositoriesButton').addClass('disabled');
      $('#exportRepositoriesButton').prop('disabled', true);
      $('#exportRepositoriesButton').off('click');
      $('#export-repositories').off('click');
      $('#assignRepositoryRecords').addClass('disabled');
      $('#assignRepositoryRecords').prop('disabled', true);
      $('#unassignRepositoryRecords').addClass('disabled');
      $('#unassignRepositoryRecords').prop('disabled', true);
    } else {
      if (rowsSelected.length === 1) {
        $('#editRepositoryRecord').prop('disabled', false);
        $('#editRepositoryRecord').removeClass('disabled');
      } else {
        $('#editRepositoryRecord').prop('disabled', true);
        $('#editRepositoryRecord').addClass('disabled');
      }
      $('#deleteRepositoryRecordsButton').prop('disabled', false);
      $('#deleteRepositoryRecordsButton').removeClass('disabled');
      $('#exportRepositoriesButton').removeClass('disabled');
      $('#exportRepositoriesButton').prop('disabled', false);
      $('#exportRepositoriesButton').on('click', function() {
        $('#exportRepositoryModal').modal('show');
      });
      $('#export-repositories').on('click', function() {
        animateSpinner(null, true);
        $('#form-export').submit();
      });
      $('#assignRepositoryRecords').removeClass('disabled');
      $('#assignRepositoryRecords').prop('disabled', false);
      $('#unassignRepositoryRecords').removeClass('disabled');
      $('#unassignRepositoryRecords').prop('disabled', false);
    }
  } else if (currentMode === 'editMode') {
    $('#addRepositoryRecord').addClass('disabled');
    $('#addRepositoryRecord').prop('disabled', true);
    $('#editRepositoryRecord').addClass('disabled');
    $('#editRepositoryRecord').prop('disabled', true);
    $('#addNewColumn').addClass('disabled');
    $('#addNewColumn').prop('disabled', true);
    $('#deleteRepositoryRecordsButton').addClass('disabled');
    $('#deleteRepositoryRecordsButton').prop('disabled', true);
    $('#exportRepositoriesButton').addClass('disabled');
    $('#exportRepositoriesButton').off('click');
    $('#export-repositories').off('click');
    $('#assignRepositoryRecords').addClass('disabled');
    $('#assignRepositoryRecords').prop('disabled', true);
    $('#unassignRepositoryRecords').addClass('disabled');
    $('#unassignRepositoryRecords').prop('disabled', true);
    $('#repository-columns-dropdown').find('.dropdown-toggle')
                                  .prop('disabled', true);
    $('th').addClass('disable-click');
    $('.repository-row-selector').addClass('disabled');
    $('.repository-row-selector').prop('disabled', true);
  }
}

// Clear all has-error tags
function clearAllErrors() {
  // Remove any validation errors
  $(selectedRecord).find('.has-error').each(function() {
    $(this).removeClass('has-error');
    $(this).find('span').remove();
  });
  // Remove any alerts
  $('#alert-container').find('div').remove();
}

function clearRowSelection() {
  $('.dt-body-center .repository-row-selector').prop('checked', false);
  $('.dt-body-center .repository-row-selector').closest('tr')
                                               .removeClass('selected');
  rowsSelected = [];
}

// Restore previous table
function onClickCancel() {
  if ($('#assigned').text().length === 0) {
    table.column(1).visible(false);
  }
  table.ajax.reload(function() {
    initRowSelection();
  }, false);
  changeToViewMode();
  updateButtons();
  animateSpinner(null, false);
}

// Handle enter key
$(document).off('keypress').keypress(function(event) {
  var keycode = (event.keyCode ? event.keyCode : event.which);
  if (currentMode === 'editMode' && keycode === '13') {
    $('#saveRecord').click();
    return false;
  }
});

// Helper functions
function getColumnIndex(id) {
  if (id < 0) {
    return false;
  }
  return table.column(id).index('visible');
}

// Takes object and surrounds it with input
function changeToInputField(object, name, value) {
  return "<div class='form-group'><input class='form-control' data-object='" +
      object + "' name='" + name + "' value='" + value + "'></input></div>";
}

// Return td element with content
function createTdElement(content) {
  var td = document.createElement('td');
  td.innerHTML = content;
  return td;
}

// Adjust columns width in table header
function adjustTableHeader() {
  table.columns.adjust();
  $('.dropdown-menu').parent()
    .on('shown.bs.dropdown hidden.bs.dropdown', function() {
      table.columns.adjust();
    });
}

function changeToViewMode() {
  currentMode = 'viewMode';
  // Table specific stuff
  table.button(0).enable(true);
}

function changeToEditMode() {
  currentMode = 'editMode';
  // Table specific stuff
  table.button(0).enable(false);
  initHeaderTooltip();
}

/*
 * Repository columns dropdown
 */
(function(table) {
  'use strict';

  var dropdown = $('#repository-columns-dropdown');
  var dropdownList = $('#repository-columns-list');

  function createNewColumn() {
    // Make an Ajax request to repository_columns_controller
    var url = $('#new-column-form').data('action');
    var columnName = $('#new-column-name').val();
    if (columnName.length > 0) {
      $.ajax({
        method: 'POST',
        dataType: 'json',
        data: {repository_column: {name: columnName}},
        error: function(data) {
          var form = $('#new-column-form');
          form.addClass('has-error');
          form.find('.help-block').remove();
          form.append('<span class="help-block">' +
            data.responseJSON.name +
            '</span>');
        },
        success: function(data) {
          var form = $('#new-column-form');
          form.find('.help-block').remove();
          if (form.hasClass('has-error')) {
            form.removeClass('has-error');
          }
          $('#new-column-name').val('');
          form.append('<span class="help-block">' +
            I18n.t('repositories.js.column_added') +
            '</span>');

          // Preserve save/delete buttons as we need them after new table
          // will be created
          $('div.toolbarButtons').appendTo('div.repository-table');
          $('div.toolbarButtons').hide();

          // Destroy datatable
          table.destroy();

          // Add number of columns
          $('#repository-table').data('num-columns',
            $('#repository-table').data('num-columns') + 1);
          // Add column to table (=table header)
          originalHeader.append(
            '<th class="repository-column" id="' + data.id + '" ' +
            'data-editable data-deletable ' +
            'data-edit-url="' + data.edit_url + '" ' +
            'data-update-url="' + data.update_url + '" ' +
            'data-destroy-html-url="' + data.destroy_html_url + '"' +
            '>' + generateColumnNameTooltip(data.name) + '</th>');

          // Remove all event handlers as we re-initialize them later with
          // new table
          $('#repository-table').off();
          $('#repository-table thead').empty();
          $('#repository-table thead').append(originalHeader);

          // Re-initialize datatable
          table = dataTableInit();
          table.on('init.dt', function() {
            loadColumnsNames();
            dropdownOverflow();
          });
        },
        url: url
      });
    } else {
      var form = $('#new-column-form');
      form.addClass('has-error');
      form.find('.help-block').remove();
      form.append('<span class="help-block">' +
        I18n.t('repositories.js.empty_column_name') +
        '</span>');
    }
  }

  function initNewColumnForm() {
    $('#repository-columns-dropdown').on('show.bs.dropdown', function() {
      // Clear input and errors when dropdown is opened
      var input = $(this).find('input#new-column-name');
      input.val('');
      var form = $('#new-column-form');
      if (form.hasClass('has-error')) {
        form.removeClass('has-error');
      }
      form.find('.help-block').remove();
    });
    $('#add-new-column-button').click(function(e) {
      e.stopPropagation();
      createNewColumn();
    });
    $('#new-column-name').keydown(function(e) {
      if (e.keyCode === 13) {
        e.preventDefault();
        createNewColumn();
      }
    });
  }

  // loads the columns names in the dropdown list
  function loadColumnsNames() {
    // Save scroll position
    var scrollPosition = dropdownList.scrollTop();
    // Clear the list
    dropdownList.find('li[data-position]').remove();
    _.each(table.columns().header(), function(el, index) {
      if (index > 1) {
        var colIndex = $(el).attr('data-column-index');
        var visible = table.column(colIndex).visible();
        var editable = $(el).is('[data-editable]');
        var deletable = $(el).is('[data-deletable]');

        var visClass = (visible) ? 'glyphicon-eye-open' : 'glyphicon-eye-close';
        var visLi = (visible) ? '' : 'col-invisible';
        var editClass = (editable) ? '' : 'disabled';
        var delClass = (deletable) ? '' : 'disabled';

        var thederName;
        if ($(el).find('.modal-tooltiptext').length > 0) {
          thederName = $(el).find('.modal-tooltiptext').text();
        } else {
          thederName = el.innerText;
        }

        var html =
          '<li ' +
          'data-position="' + colIndex + '" ' +
          'data-id="' + $(el).attr('id') + '" ' +
          'data-edit-url=' + $(el).attr('data-edit-url') + ' ' +
          'data-update-url=' + $(el).attr('data-update-url') + ' ' +
          'data-destroy-html-url=' + $(el).attr('data-destroy-html-url') + ' ' +
          'class="' + visLi + '"><i class="grippy"></i> ' +
          '<span class="text">' + generateColumnNameTooltip(thederName) +
          '</span> ' +
          '<span class="form-group"><input type="text" class="text-edit ' +
            'form-control" style="display: none;" />' +
          '<span class="pull-right controls">' +
          '<span class="ok glyphicon glyphicon-ok" style="display: none;" ' +
            'title="' + $('#repository-table').data('save-text') + '"></span>' +
          '<span class="cancel glyphicon glyphicon-remove" ' +
            'style="display: none;" ' +
            'title="' + $('#repository-table').data('cancel-text') +
            '"></span>' +
          '<span class="vis glyphicon ' + visClass + '" title="' +
            $('#repository-table').data('columns-visibility-text') + '">' +
          '</span> ' +
          '<span class="edit glyphicon glyphicon-pencil ' + editClass +
            '" title="' + $('#repository-table').data('edit-text') +
            '"></span>' +
          '<span class="del glyphicon glyphicon-trash ' + delClass +
            '" title="' + $('#repository-table').data('columns-delete-text') +
            '"></span>' +
          '</span><br></span></li>';
        dropdownList.append(html);
      }
    });
    // Restore scroll position
    dropdownList.scrollTop(scrollPosition);
    toggleColumnVisibility();
    // toggles grip img
    customLiHoverEffect();
  }

  function customLiHoverEffect() {
    var liEl = dropdownList.find('li');
    liEl.mouseover(function() {
      $(this)
        .find('.grippy')
        .addClass('grippy-img');
    }).mouseout(function() {
      $(this)
        .find('.grippy')
        .removeClass('grippy-img');
    });
  }

  function toggleColumnVisibility() {
    var lis = dropdownList.find('.vis');
    lis.on('click', function(event) {
      event.stopPropagation();
      var self = $(this);
      var li = self.closest('li');
      var column = table.column(li.attr('data-position'));

      if (column.visible()) {
        self.addClass('glyphicon-eye-close');
        self.removeClass('glyphicon-eye-open');
        li.addClass('col-invisible');
        column.visible(false);
        table.setColumnSearchable(column.index(), false);
      } else {
        self.addClass('glyphicon-eye-open');
        self.removeClass('glyphicon-eye-close');
        li.removeClass('col-invisible');
        column.visible(true);
        table.setColumnSearchable(column.index(), true);
        initHeaderTooltip();
      }

      // Re-filter/search if neccesary
      var searchText = $('div.dataTables_filter input').val();
      if (!_.isEmpty(searchText)) {
        table.search(searchText).draw();
      }
      initRowSelection();
    });
  }

  function initSorting() {
    dropdownList.sortable({
      items: 'li:not(.add-new-column-form)',
      cancel: '.new-repository-column',
      axis: 'y',
      update: function() {
        var reorderer = table.colReorder;
        var listIds = [];
        // We skip first two columns
        listIds.push(0, 1);
        dropdownList.find('li[data-position]').each(function() {
          listIds.push($(this).first().data('position'));
        });
        reorderer.order(listIds, false);
        loadColumnsNames();
      }
    });
  }

  function initEditColumns() {
    function cancelEditMode() {
      dropdownList.find('.text-edit').hide();
      dropdownList.find('.controls .ok,.cancel').hide();
      dropdownList.find('.text').css('display', ''); // show() doesn't work
      dropdownList.find('.controls .vis,.edit,.del').css('display', ''); // show() doesn't work
    }

    function editColumn(li) {
      var id = li.attr('data-id');
      var text = li.find('.text');
      var textEdit = li.find('.text-edit');
      var newName = textEdit.val().trim();
      var url = li.attr('data-update-url');

      $.ajax({
        url: url,
        type: 'PUT',
        data: {repository_column: {name: newName}},
        dataType: 'json',
        success: function() {
          dropdownList.sortable('enable');
          $(li).clearFormErrors();
          text.html(generateColumnNameTooltip(newName));
          $(table.columns().header()).filter('#' + id)
            .html(generateColumnNameTooltip(newName));
          originalHeader.find('#' + id).html(newName);
          cancelEditMode();
          initHeaderTooltip();
        },
        error: function(xhr) {
          dropdownList.sortable('disable');
          $(li).clearFormErrors();
          var msg = $.parseJSON(xhr.responseText);

          renderFormError(xhr,
                          $(li).find('.text-edit'),
                          Object.keys(msg)[0] + ' ' + msg.name.toString());
          var verticalHeight = $(li).offset().top;
          dropdownList.scrollTo(verticalHeight, 0);
        }
      });
    }

    // On edit buttons click (bind onto master dropdown list)
    dropdownList.on('click', '.edit:not(.disabled)', function(event) {
      event.stopPropagation();

      // Clear all input errors
      _.each(dropdownList, function(el) {
        $(el).clearFormErrors();
      });

      cancelEditMode();

      var li = $(this).closest('li');
      var url = li.attr('data-edit-url');
      ajaxCallEvent();

      function ajaxCallEvent() {
        $.ajax({
          url: url,
          success: function() {
            var text;
            var textEdit;
            var controls;
            var controlsEdit;
            text = li.find('.text');
            if ($(text).find('.modal-tooltiptext').length > 0) {
              text = $(text).find('.modal-tooltiptext');
            }
            textEdit = li.find('.text-edit');
            controls = li.find('.controls .vis,.edit,.del');
            controlsEdit = li.find('.controls .ok,.cancel');

            // Toggle edit mode
            li.addClass('editing');

            // Set the text-edit's value
            textEdit.val(text.text().trim());

            // Toggle elements
            text.hide();
            controls.hide();
            textEdit.css('display', ''); // show() doesn't work
            controlsEdit.css('display', ''); // show() doesn't work
            dropdownList.sortable('disable');
            dropdownList.on('click', function(ev) {
              ev.stopPropagation();
            });
            // Focus input
            textEdit.focus();
          },
          error: function(e) {
            $(li).clearFormErrors();
            var msg = $.parseJSON(e.responseText);

            renderFormError(undefined,
                            $(li).find('.text-edit'),
                            msg.name.toString());
            var verticalHeight = $(li).offset().top;
            dropdownList.scrollTo(verticalHeight, 0);
            setTimeout(function() {
              $(li).clearFormErrors();
            }, 5000);
          }
        });
      }
    });

    // On hiding dropdown, cancel edit mode throughout dropdown
    dropdown.on('hidden.bs.dropdown', function() {
      cancelEditMode();
    });

    // On OK buttons click
    dropdownList.on('click', '.ok', function(event) {
      event.stopPropagation();
      dropdownList.sortable('enable');
      var self = $(this);
      var li = self.closest('li');
      $(li).clearFormErrors();
      editColumn(li);
    });

    // On enter click while editing column text
    dropdownList.on('keydown', 'input.text-edit', function(event) {
      if (event.keyCode === 13) {
        event.preventDefault();
        dropdownList.sortable('enable');
        var self = $(this);
        var li = self.closest('li');
        $(li).clearFormErrors();
        editColumn(li);
      }
    });

    // On cancel buttons click
    dropdownList.on('click', '.cancel', function(event) {
      event.stopPropagation();
      dropdownList.sortable('enable');
      var self = $(this);
      var li = self.closest('li');
      $(li).clearFormErrors();
      li.removeClass('editing');

      li.find('.text-edit').hide();
      li.find('.controls .ok,.cancel').hide();
      li.find('.text').css('display', ''); // show() doesn't work
      li.find('.controls .vis,.edit,.del').css('display', ''); // show() doesn't work
    });
  }

  function initDeleteColumns() {
    var modal = $('#deleteRepositoryColumn');

    dropdownList.on('click', '.del', function(event) {
      event.stopPropagation();

      var self = $(this);
      var li = self.closest('li');
      var url = li.attr('data-destroy-html-url');
      var colIndex = originalHeader.find('#' + li.attr('data-id')).index();

      $.ajax({
        url: url,
        type: 'POST',
        dataType: 'json',
        data: {column_index: colIndex},
        success: function(data) {
          var modalBody = modal.find('.modal-body');

          // Inject the body's HTML into modal
          modalBody.html(data.html);

          // Show the modal
          modal.modal('show');
        },
        error: function(xhr) {
          dropdownList.sortable('disable');
          $(li).clearFormErrors();
          var msg = $.parseJSON(xhr.responseText);

          renderFormError(undefined,
                          $(li).find('.text-edit'),
                          msg.name.toString());
          var verticalHeight = $(li).offset().top;
          dropdownList.scrollTo(verticalHeight, 0);
          setTimeout(function() {
            $(li).clearFormErrors();
          }, 5000);
        }
      });
    });

    modal.find('.modal-footer [data-action=delete]').on('click', function() {
      var modalBody = modal.find('.modal-body');
      var form = modalBody.find('[data-role=destroy-repository-column-form]');
      var id = form.attr('data-id');

      form
      .on('ajax:success', function() {
        // Preserve save/delete buttons as we need them after new table
        // will be created
        $('div.toolbarButtons').appendTo('div.repository-table');
        $('div.toolbarButtons').hide();

        // Destroy datatable
        table.destroy();

        // Subtract number of columns
        $('#repository-table').data(
          'num-columns',
          $('#repository-table').data('num-columns') - 1
        );

        // Remove column from table (=table header) & rows
        var th = originalHeader.find('#' + id);
        var index = th.index();
        th.remove();
        $('#repository-table tbody td:nth-child(' + (index + 1) + ')').remove();

        // Remove all event handlers as we re-initialize them later with
        // new table
        $('#repository-table').off();
        $('#repository-table thead').empty();
        $('#repository-table thead').append(originalHeader);

        // Re-initialize datatable
        table = dataTableInit();
        loadColumnsNames();

        // Hide modal
        modal.modal('hide');
      })
      .on('ajax:error', function() {
        // TODO
      });

      form.submit();
    });

    modal.on('hidden.bs.modal', function() {
      // Remove event handlers, clear contents
      var modalBody = modal.find('.modal-body');
      modalBody.off();
      modalBody.html('');
    });
  }

  // calculate the max height of window and adjust dropdown max-height
  function dropdownOverflow() {
    var windowHeight = $(window).height();
    var offset = windowHeight - dropdownList.offset().top;

    if (dropdownList.height() >= offset) {
      dropdownList.css('maxHeight', offset);
    }
  }

  function generateColumnNameTooltip(name) {
    var maxLength = $('#repository-table').data('max-dropdown-length');
    if ($.trim(name).length > maxLength) {
      return '<div class="modal-tooltip">' +
             truncateLongString(name, maxLength) +
             '<span class="modal-tooltiptext">' + name + '</span></div>';
    }
    return name;
  }

  // initialze dropdown after the table is loaded
  function initDropdown() {
    table.on('init.dt', function() {
      initNewColumnForm();
      initSorting();
      toggleColumnVisibility();
      initEditColumns();
      initDeleteColumns();
    });
    $('#repository-columns-dropdown').on('show.bs.dropdown', function() {
      loadColumnsNames();
      dropdownList.sortable('enable');
    });

    $('#repository-columns-dropdown').on('shown.bs.dropdown', function() {
      dropdownOverflow();
    });
  }

  initDropdown();
})(table);