resources/src/mediawiki.rcfilters/mw.rcfilters.Controller.js

   1 ( function ( mw, $ ) {
   2         /* eslint no-underscore-dangle: "off" */
   3         /**
   4          * Controller for the filters in Recent Changes
   5          * @class
   6          *
   7          * @constructor
   8          * @param {mw.rcfilters.dm.FiltersViewModel} filtersModel Filters view model
   9          * @param {mw.rcfilters.dm.ChangesListViewModel} changesListModel Changes list view model
  10          * @param {mw.rcfilters.dm.SavedQueriesModel} savedQueriesModel Saved queries model
  11          * @param {Object} config Additional configuration
  12          * @cfg {string} savedQueriesPreferenceName Where to save the saved queries
  13          * @cfg {string} daysPreferenceName Preference name for the days filter
  14          * @cfg {string} limitPreferenceName Preference name for the limit filter
  15          */
  16         mw.rcfilters.Controller = function MwRcfiltersController( filtersModel, changesListModel, savedQueriesModel, config ) {
  17                 this.filtersModel = filtersModel;
  18                 this.changesListModel = changesListModel;
  19                 this.savedQueriesModel = savedQueriesModel;
  20                 this.savedQueriesPreferenceName = config.savedQueriesPreferenceName;
  21                 this.daysPreferenceName = config.daysPreferenceName;
  22                 this.limitPreferenceName = config.limitPreferenceName;
  23
  24                 this.requestCounter = {};
  25                 this.baseFilterState = {};
  26                 this.uriProcessor = null;
  27                 this.initializing = false;
  28                 this.wereSavedQueriesSaved = false;
  29
  30                 this.prevLoggedItems = [];
  31
  32                 this.FILTER_CHANGE = 'filterChange';
  33                 this.SHOW_NEW_CHANGES = 'showNewChanges';
  34                 this.LIVE_UPDATE = 'liveUpdate';
  35         };
  36
  37         /* Initialization */
  38         OO.initClass( mw.rcfilters.Controller );
  39
  40         /**
  41          * Initialize the filter and parameter states
  42          *
  43          * @param {Array} filterStructure Filter definition and structure for the model
  44          * @param {Object} [namespaceStructure] Namespace definition
  45          * @param {Object} [tagList] Tag definition
  46          * @param {Object} [conditionalViews] Conditional view definition
  47          */
  48         mw.rcfilters.Controller.prototype.initialize = function ( filterStructure, namespaceStructure, tagList, conditionalViews ) {
  49                 var parsedSavedQueries, pieces,
  50                         displayConfig = mw.config.get( 'StructuredChangeFiltersDisplayConfig' ),
  51                         defaultSavedQueryExists = mw.config.get( 'wgStructuredChangeFiltersDefaultSavedQueryExists' ),
  52                         controller = this,
  53                         views = $.extend( true, {}, conditionalViews ),
  54                         items = [],
  55                         uri = new mw.Uri();
  56
  57                 // Prepare views
  58                 if ( namespaceStructure ) {
  59                         items = [];
  60                         $.each( namespaceStructure, function ( namespaceID, label ) {
  61                                 // Build and clean up the individual namespace items definition
  62                                 items.push( {
  63                                         name: namespaceID,
  64                                         label: label || mw.msg( 'blanknamespace' ),
  65                                         description: '',
  66                                         identifiers: [
  67                                                 ( namespaceID < 0 || namespaceID % 2 === 0 ) ?
  68                                                         'subject' : 'talk'
  69                                         ],
  70                                         cssClass: 'mw-changeslist-ns-' + namespaceID
  71                                 } );
  72                         } );
  73
  74                         views.namespaces = {
  75                                 title: mw.msg( 'namespaces' ),
  76                                 trigger: ':',
  77                                 groups: [ {
  78                                         // Group definition (single group)
  79                                         name: 'namespace', // parameter name is singular
  80                                         type: 'string_options',
  81                                         title: mw.msg( 'namespaces' ),
  82                                         labelPrefixKey: { 'default': 'rcfilters-tag-prefix-namespace', inverted: 'rcfilters-tag-prefix-namespace-inverted' },
  83                                         separator: ';',
  84                                         fullCoverage: true,
  85                                         filters: items
  86                                 } ]
  87                         };
  88                         views.invert = {
  89                                 groups: [
  90                                         {
  91                                                 name: 'invertGroup',
  92                                                 type: 'boolean',
  93                                                 hidden: true,
  94                                                 filters: [ {
  95                                                         name: 'invert',
  96                                                         'default': '0'
  97                                                 } ]
  98                                         } ]
  99                         };
 100                 }
 101                 if ( tagList ) {
 102                         views.tags = {
 103                                 title: mw.msg( 'rcfilters-view-tags' ),
 104                                 trigger: '#',
 105                                 groups: [ {
 106                                         // Group definition (single group)
 107                                         name: 'tagfilter', // Parameter name
 108                                         type: 'string_options',
 109                                         title: 'rcfilters-view-tags', // Message key
 110                                         labelPrefixKey: 'rcfilters-tag-prefix-tags',
 111                                         separator: '|',
 112                                         fullCoverage: false,
 113                                         filters: tagList
 114                                 } ]
 115                         };
 116                 }
 117
 118                 // Add parameter range operations
 119                 views.range = {
 120                         groups: [
 121                                 {
 122                                         name: 'limit',
 123                                         type: 'single_option',
 124                                         title: '', // Because it's a hidden group, this title actually appears nowhere
 125                                         hidden: true,
 126                                         allowArbitrary: true,
 127                                         validate: $.isNumeric,
 128                                         range: {
 129                                                 min: 0, // The server normalizes negative numbers to 0 results
 130                                                 max: 1000
 131                                         },
 132                                         sortFunc: function ( a, b ) { return Number( a.name ) - Number( b.name ); },
 133                                         'default': mw.user.options.get( this.limitPreferenceName, displayConfig.limitDefault ),
 134                                         sticky: true,
 135                                         filters: displayConfig.limitArray.map( function ( num ) {
 136                                                 return controller._createFilterDataFromNumber( num, num );
 137                                         } )
 138                                 },
 139                                 {
 140                                         name: 'days',
 141                                         type: 'single_option',
 142                                         title: '', // Because it's a hidden group, this title actually appears nowhere
 143                                         hidden: true,
 144                                         allowArbitrary: true,
 145                                         validate: $.isNumeric,
 146                                         range: {
 147                                                 min: 0,
 148                                                 max: displayConfig.maxDays
 149                                         },
 150                                         sortFunc: function ( a, b ) { return Number( a.name ) - Number( b.name ); },
 151                                         numToLabelFunc: function ( i ) {
 152                                                 return Number( i ) < 1 ?
 153                                                         ( Number( i ) * 24 ).toFixed( 2 ) :
 154                                                         Number( i );
 155                                         },
 156                                         'default': mw.user.options.get( this.daysPreferenceName, displayConfig.daysDefault ),
 157                                         sticky: true,
 158                                         filters: [
 159                                                 // Hours (1, 2, 6, 12)
 160                                                 0.04166, 0.0833, 0.25, 0.5
 161                                         // Days
 162                                         ].concat( displayConfig.daysArray )
 163                                                 .map( function ( num ) {
 164                                                         return controller._createFilterDataFromNumber(
 165                                                                 num,
 166                                                                 // Convert fractions of days to number of hours for the labels
 167                                                                 num < 1 ? Math.round( num * 24 ) : num
 168                                                         );
 169                                                 } )
 170                                 }
 171                         ]
 172                 };
 173
 174                 views.display = {
 175                         groups: [
 176                                 {
 177                                         name: 'display',
 178                                         type: 'boolean',
 179                                         title: '', // Because it's a hidden group, this title actually appears nowhere
 180                                         hidden: true,
 181                                         sticky: true,
 182                                         filters: [
 183                                                 {
 184                                                         name: 'enhanced',
 185                                                         'default': String( mw.user.options.get( 'usenewrc', 0 ) )
 186                                                 }
 187                                         ]
 188                                 }
 189                         ]
 190                 };
 191
 192                 // Before we do anything, we need to see if we require additional items in the
 193                 // groups that have 'AllowArbitrary'. For the moment, those are only single_option
 194                 // groups; if we ever expand it, this might need further generalization:
 195                 $.each( views, function ( viewName, viewData ) {
 196                         viewData.groups.forEach( function ( groupData ) {
 197                                 var extraValues = [];
 198                                 if ( groupData.allowArbitrary ) {
 199                                         // If the value in the URI isn't in the group, add it
 200                                         if ( uri.query[ groupData.name ] !== undefined ) {
 201                                                 extraValues.push( uri.query[ groupData.name ] );
 202                                         }
 203                                         // If the default value isn't in the group, add it
 204                                         if ( groupData.default !== undefined ) {
 205                                                 extraValues.push( String( groupData.default ) );
 206                                         }
 207                                         controller.addNumberValuesToGroup( groupData, extraValues );
 208                                 }
 209                         } );
 210                 } );
 211
 212                 // Initialize the model
 213                 this.filtersModel.initializeFilters( filterStructure, views );
 214
 215                 this.uriProcessor = new mw.rcfilters.UriProcessor(
 216                         this.filtersModel
 217                 );
 218
 219                 if ( !mw.user.isAnon() ) {
 220                         try {
 221                                 parsedSavedQueries = JSON.parse( mw.user.options.get( this.savedQueriesPreferenceName ) || '{}' );
 222                         } catch ( err ) {
 223                                 parsedSavedQueries = {};
 224                         }
 225
 226                         // Initialize saved queries
 227                         this.savedQueriesModel.initialize( parsedSavedQueries );
 228                         if ( this.savedQueriesModel.isConverted() ) {
 229                                 // Since we know we converted, we're going to re-save
 230                                 // the queries so they are now migrated to the new format
 231                                 this._saveSavedQueries();
 232                         }
 233                 }
 234
 235                 // Check whether we need to load defaults.
 236                 // We do this by checking whether the current URI query
 237                 // contains any parameters recognized by the system.
 238                 // If it does, we load the given state.
 239                 // If it doesn't, we have no values at all, and we assume
 240                 // the user loads the base-page and we load defaults.
 241                 // Defaults should only be applied on load (if necessary)
 242                 // or on request
 243                 this.initializing = true;
 244
 245                 if ( defaultSavedQueryExists ) {
 246                         // This came from the server, meaning that we have a default
 247                         // saved query, but the server could not load it, probably because
 248                         // it was pre-conversion to the new format.
 249                         // We need to load this query again
 250                         this.applySavedQuery( this.savedQueriesModel.getDefault() );
 251                 } else {
 252                         // There are either recognized parameters in the URL
 253                         // or there are none, but there is also no default
 254                         // saved query (so defaults are from the backend)
 255                         // We want to update the state but not fetch results
 256                         // again
 257                         this.updateStateFromUrl( false );
 258
 259                         pieces = this._extractChangesListInfo( $( '#mw-content-text' ) );
 260
 261                         // Update the changes list with the existing data
 262                         // so it gets processed
 263                         this.changesListModel.update(
 264                                 pieces.changes,
 265                                 pieces.fieldset,
 266                                 pieces.noResultsDetails,
 267                                 true // We're using existing DOM elements
 268                         );
 269                 }
 270
 271                 this.initializing = false;
 272                 this.switchView( 'default' );
 273
 274                 this.pollingRate = mw.config.get( 'StructuredChangeFiltersLiveUpdatePollingRate' );
 275                 if ( this.pollingRate ) {
 276                         this._scheduleLiveUpdate();
 277                 }
 278         };
 279
 280         /**
 281          * Extracts information from the changes list DOM
 282          *
 283          * @param {jQuery} $root Root DOM to find children from
 284          * @param {boolean} [statusCode] Server response status code
 285          * @return {Object} Information about changes list
 286          * @return {Object|string} return.changes Changes list, or 'NO_RESULTS' if there are no results
 287          *   (either normally or as an error)
 288          * @return {string} [return.noResultsDetails] 'NO_RESULTS_NORMAL' for a normal 0-result set,
 289          *   'NO_RESULTS_TIMEOUT' for no results due to a timeout, or omitted for more than 0 results
 290          * @return {jQuery} return.fieldset Fieldset
 291          */
 292         mw.rcfilters.Controller.prototype._extractChangesListInfo = function ( $root, statusCode ) {
 293                 var info,
 294                         $changesListContents = $root.find( '.mw-changeslist' ).first().contents(),
 295                         areResults = !!$changesListContents.length,
 296                         checkForLogout = !areResults && statusCode === 200;
 297
 298                 // We check if user logged out on different tab/browser or the session has expired.
 299                 // 205 status code returned from the server, which indicates that we need to reload the page
 300                 // is not usable on WL page, because we get redirected to login page, which gives 200 OK
 301                 // status code (if everything else goes well).
 302                 // Bug: T177717
 303                 if ( checkForLogout && !!$root.find( '#wpName1' ).length ) {
 304                         location.reload( false );
 305                         return;
 306                 }
 307
 308                 info = {
 309                         changes: $changesListContents.length ? $changesListContents : 'NO_RESULTS',
 310                         fieldset: $root.find( 'fieldset.cloptions' ).first()
 311                 };
 312
 313                 if ( !areResults ) {
 314                         if ( $root.find( '.mw-changeslist-timeout' ).length ) {
 315                                 info.noResultsDetails = 'NO_RESULTS_TIMEOUT';
 316                         } else if ( $root.find( '.mw-changeslist-notargetpage' ).length ) {
 317                                 info.noResultsDetails = 'NO_RESULTS_NO_TARGET_PAGE';
 318                         } else {
 319                                 info.noResultsDetails = 'NO_RESULTS_NORMAL';
 320                         }
 321                 }
 322
 323                 return info;
 324         };
 325
 326         /**
 327          * Create filter data from a number, for the filters that are numerical value
 328          *
 329          * @param {Number} num Number
 330          * @param {Number} numForDisplay Number for the label
 331          * @return {Object} Filter data
 332          */
 333         mw.rcfilters.Controller.prototype._createFilterDataFromNumber = function ( num, numForDisplay ) {
 334                 return {
 335                         name: String( num ),
 336                         label: mw.language.convertNumber( numForDisplay )
 337                 };
 338         };
 339
 340         /**
 341          * Add an arbitrary values to groups that allow arbitrary values
 342          *
 343          * @param {Object} groupData Group data
 344          * @param {string|string[]} arbitraryValues An array of arbitrary values to add to the group
 345          */
 346         mw.rcfilters.Controller.prototype.addNumberValuesToGroup = function ( groupData, arbitraryValues ) {
 347                 var controller = this,
 348                         normalizeWithinRange = function ( range, val ) {
 349                                 if ( val < range.min ) {
 350                                         return range.min; // Min
 351                                 } else if ( val >= range.max ) {
 352                                         return range.max; // Max
 353                                 }
 354                                 return val;
 355                         };
 356
 357                 arbitraryValues = Array.isArray( arbitraryValues ) ? arbitraryValues : [ arbitraryValues ];
 358
 359                 // Normalize the arbitrary values and the default value for a range
 360                 if ( groupData.range ) {
 361                         arbitraryValues = arbitraryValues.map( function ( val ) {
 362                                 return normalizeWithinRange( groupData.range, val );
 363                         } );
 364
 365                         // Normalize the default, since that's user defined
 366                         if ( groupData.default !== undefined ) {
 367                                 groupData.default = String( normalizeWithinRange( groupData.range, groupData.default ) );
 368                         }
 369                 }
 370
 371                 // This is only true for single_option group
 372                 // We assume these are the only groups that will allow for
 373                 // arbitrary, since it doesn't make any sense for the other
 374                 // groups.
 375                 arbitraryValues.forEach( function ( val ) {
 376                         if (
 377                                 // If the group allows for arbitrary data
 378                                 groupData.allowArbitrary &&
 379                                 // and it is single_option (or string_options, but we
 380                                 // don't have cases of those yet, nor do we plan to)
 381                                 groupData.type === 'single_option' &&
 382                                 // and, if there is a validate method and it passes on
 383                                 // the data
 384                                 ( !groupData.validate || groupData.validate( val ) ) &&
 385                                 // but if that value isn't already in the definition
 386                                 groupData.filters
 387                                         .map( function ( filterData ) {
 388                                                 return String( filterData.name );
 389                                         } )
 390                                         .indexOf( String( val ) ) === -1
 391                         ) {
 392                                 // Add the filter information
 393                                 groupData.filters.push( controller._createFilterDataFromNumber(
 394                                         val,
 395                                         groupData.numToLabelFunc ?
 396                                                 groupData.numToLabelFunc( val ) :
 397                                                 val
 398                                 ) );
 399
 400                                 // If there's a sort function set up, re-sort the values
 401                                 if ( groupData.sortFunc ) {
 402                                         groupData.filters.sort( groupData.sortFunc );
 403                                 }
 404                         }
 405                 } );
 406         };
 407
 408         /**
 409          * Switch the view of the filters model
 410          *
 411          * @param {string} view Requested view
 412          */
 413         mw.rcfilters.Controller.prototype.switchView = function ( view ) {
 414                 this.filtersModel.switchView( view );
 415         };
 416
 417         /**
 418          * Reset to default filters
 419          */
 420         mw.rcfilters.Controller.prototype.resetToDefaults = function () {
 421                 var params = this._getDefaultParams();
 422                 if ( this.applyParamChange( params ) ) {
 423                         // Only update the changes list if there was a change to actual filters
 424                         this.updateChangesList();
 425                 } else {
 426                         this.uriProcessor.updateURL( params );
 427                 }
 428         };
 429
 430         /**
 431          * Check whether the default values of the filters are all false.
 432          *
 433          * @return {boolean} Defaults are all false
 434          */
 435         mw.rcfilters.Controller.prototype.areDefaultsEmpty = function () {
 436                 return $.isEmptyObject( this._getDefaultParams() );
 437         };
 438
 439         /**
 440          * Empty all selected filters
 441          */
 442         mw.rcfilters.Controller.prototype.emptyFilters = function () {
 443                 var highlightedFilterNames = this.filtersModel.getHighlightedItems()
 444                         .map( function ( filterItem ) { return { name: filterItem.getName() }; } );
 445
 446                 if ( this.applyParamChange( {} ) ) {
 447                         // Only update the changes list if there was a change to actual filters
 448                         this.updateChangesList();
 449                 } else {
 450                         this.uriProcessor.updateURL();
 451                 }
 452
 453                 if ( highlightedFilterNames ) {
 454                         this._trackHighlight( 'clearAll', highlightedFilterNames );
 455                 }
 456         };
 457
 458         /**
 459          * Update the selected state of a filter
 460          *
 461          * @param {string} filterName Filter name
 462          * @param {boolean} [isSelected] Filter selected state
 463          */
 464         mw.rcfilters.Controller.prototype.toggleFilterSelect = function ( filterName, isSelected ) {
 465                 var filterItem = this.filtersModel.getItemByName( filterName );
 466
 467                 if ( !filterItem ) {
 468                         // If no filter was found, break
 469                         return;
 470                 }
 471
 472                 isSelected = isSelected === undefined ? !filterItem.isSelected() : isSelected;
 473
 474                 if ( filterItem.isSelected() !== isSelected ) {
 475                         this.filtersModel.toggleFilterSelected( filterName, isSelected );
 476
 477                         this.updateChangesList();
 478
 479                         // Check filter interactions
 480                         this.filtersModel.reassessFilterInteractions( filterItem );
 481                 }
 482         };
 483
 484         /**
 485          * Clear both highlight and selection of a filter
 486          *
 487          * @param {string} filterName Name of the filter item
 488          */
 489         mw.rcfilters.Controller.prototype.clearFilter = function ( filterName ) {
 490                 var filterItem = this.filtersModel.getItemByName( filterName ),
 491                         isHighlighted = filterItem.isHighlighted(),
 492                         isSelected = filterItem.isSelected();
 493
 494                 if ( isSelected || isHighlighted ) {
 495                         this.filtersModel.clearHighlightColor( filterName );
 496                         this.filtersModel.toggleFilterSelected( filterName, false );
 497
 498                         if ( isSelected ) {
 499                                 // Only update the changes list if the filter changed
 500                                 // its selection state. If it only changed its highlight
 501                                 // then don't reload
 502                                 this.updateChangesList();
 503                         }
 504
 505                         this.filtersModel.reassessFilterInteractions( filterItem );
 506
 507                         // Log filter grouping
 508                         this.trackFilterGroupings( 'removefilter' );
 509                 }
 510
 511                 if ( isHighlighted ) {
 512                         this._trackHighlight( 'clear', filterName );
 513                 }
 514         };
 515
 516         /**
 517          * Toggle the highlight feature on and off
 518          */
 519         mw.rcfilters.Controller.prototype.toggleHighlight = function () {
 520                 this.filtersModel.toggleHighlight();
 521                 this.uriProcessor.updateURL();
 522
 523                 if ( this.filtersModel.isHighlightEnabled() ) {
 524                         mw.hook( 'RcFilters.highlight.enable' ).fire();
 525                 }
 526         };
 527
 528         /**
 529          * Toggle the namespaces inverted feature on and off
 530          */
 531         mw.rcfilters.Controller.prototype.toggleInvertedNamespaces = function () {
 532                 this.filtersModel.toggleInvertedNamespaces();
 533                 if (
 534                         this.filtersModel.getFiltersByView( 'namespaces' ).filter(
 535                                 function ( filterItem ) { return filterItem.isSelected(); }
 536                         ).length
 537                 ) {
 538                         // Only re-fetch results if there are namespace items that are actually selected
 539                         this.updateChangesList();
 540                 } else {
 541                         this.uriProcessor.updateURL();
 542                 }
 543         };
 544
 545         /**
 546          * Set the value of the 'showlinkedto' parameter
 547          * @param {boolean} value
 548          */
 549         mw.rcfilters.Controller.prototype.setShowLinkedTo = function ( value ) {
 550                 var targetItem = this.filtersModel.getGroup( 'page' ).getItemByParamName( 'target' ),
 551                         showLinkedToItem = this.filtersModel.getGroup( 'toOrFrom' ).getItemByParamName( 'showlinkedto' );
 552
 553                 this.filtersModel.toggleFilterSelected( showLinkedToItem.getName(), value );
 554                 this.uriProcessor.updateURL();
 555                 // reload the results only when target is set
 556                 if ( targetItem.getValue() ) {
 557                         this.updateChangesList();
 558                 }
 559         };
 560
 561         /**
 562          * Set the target page
 563          * @param {string} page
 564          */
 565         mw.rcfilters.Controller.prototype.setTargetPage = function ( page ) {
 566                 var targetItem = this.filtersModel.getGroup( 'page' ).getItemByParamName( 'target' );
 567                 targetItem.setValue( page );
 568                 this.uriProcessor.updateURL();
 569                 this.updateChangesList();
 570         };
 571
 572         /**
 573          * Set the highlight color for a filter item
 574          *
 575          * @param {string} filterName Name of the filter item
 576          * @param {string} color Selected color
 577          */
 578         mw.rcfilters.Controller.prototype.setHighlightColor = function ( filterName, color ) {
 579                 this.filtersModel.setHighlightColor( filterName, color );
 580                 this.uriProcessor.updateURL();
 581                 this._trackHighlight( 'set', { name: filterName, color: color } );
 582         };
 583
 584         /**
 585          * Clear highlight for a filter item
 586          *
 587          * @param {string} filterName Name of the filter item
 588          */
 589         mw.rcfilters.Controller.prototype.clearHighlightColor = function ( filterName ) {
 590                 this.filtersModel.clearHighlightColor( filterName );
 591                 this.uriProcessor.updateURL();
 592                 this._trackHighlight( 'clear', filterName );
 593         };
 594
 595         /**
 596          * Enable or disable live updates.
 597          * @param {boolean} enable True to enable, false to disable
 598          */
 599         mw.rcfilters.Controller.prototype.toggleLiveUpdate = function ( enable ) {
 600                 this.changesListModel.toggleLiveUpdate( enable );
 601                 if ( this.changesListModel.getLiveUpdate() && this.changesListModel.getNewChangesExist() ) {
 602                         this.updateChangesList( null, this.LIVE_UPDATE );
 603                 }
 604         };
 605
 606         /**
 607          * Set a timeout for the next live update.
 608          * @private
 609          */
 610         mw.rcfilters.Controller.prototype._scheduleLiveUpdate = function () {
 611                 setTimeout( this._doLiveUpdate.bind( this ), this.pollingRate * 1000 );
 612         };
 613
 614         /**
 615          * Perform a live update.
 616          * @private
 617          */
 618         mw.rcfilters.Controller.prototype._doLiveUpdate = function () {
 619                 if ( !this._shouldCheckForNewChanges() ) {
 620                         // skip this turn and check back later
 621                         this._scheduleLiveUpdate();
 622                         return;
 623                 }
 624
 625                 this._checkForNewChanges()
 626                         .then( function ( statusCode ) {
 627                                 // no result is 204 with the 'peek' param
 628                                 // logged out is 205
 629                                 var newChanges = statusCode === 200;
 630
 631                                 if ( !this._shouldCheckForNewChanges() ) {
 632                                         // by the time the response is received,
 633                                         // it may not be appropriate anymore
 634                                         return;
 635                                 }
 636
 637                                 // 205 is the status code returned from server when user's logged in/out
 638                                 // status is not matching while fetching live update changes.
 639                                 // This works only on Recent Changes page. For WL, look _extractChangesListInfo.
 640                                 // Bug: T177717
 641                                 if ( statusCode === 205 ) {
 642                                         location.reload( false );
 643                                         return;
 644                                 }
 645
 646                                 if ( newChanges ) {
 647                                         if ( this.changesListModel.getLiveUpdate() ) {
 648                                                 return this.updateChangesList( null, this.LIVE_UPDATE );
 649                                         } else {
 650                                                 this.changesListModel.setNewChangesExist( true );
 651                                         }
 652                                 }
 653                         }.bind( this ) )
 654                         .always( this._scheduleLiveUpdate.bind( this ) );
 655         };
 656
 657         /**
 658          * @return {boolean} It's appropriate to check for new changes now
 659          * @private
 660          */
 661         mw.rcfilters.Controller.prototype._shouldCheckForNewChanges = function () {
 662                 return !document.hidden &&
 663                         !this.filtersModel.hasConflict() &&
 664                         !this.changesListModel.getNewChangesExist() &&
 665                         !this.updatingChangesList &&
 666                         this.changesListModel.getNextFrom();
 667         };
 668
 669         /**
 670          * Check if new changes, newer than those currently shown, are available
 671          *
 672          * @return {jQuery.Promise} Promise object that resolves with a bool
 673          *      specifying if there are new changes or not
 674          *
 675          * @private
 676          */
 677         mw.rcfilters.Controller.prototype._checkForNewChanges = function () {
 678                 var params = {
 679                         limit: 1,
 680                         peek: 1, // bypasses ChangesList specific UI
 681                         from: this.changesListModel.getNextFrom(),
 682                         isAnon: mw.user.isAnon()
 683                 };
 684                 return this._queryChangesList( 'liveUpdate', params ).then(
 685                         function ( data ) {
 686                                 return data.status;
 687                         }
 688                 );
 689         };
 690
 691         /**
 692          * Show the new changes
 693          *
 694          * @return {jQuery.Promise} Promise object that resolves after
 695          * fetching and showing the new changes
 696          */
 697         mw.rcfilters.Controller.prototype.showNewChanges = function () {
 698                 return this.updateChangesList( null, this.SHOW_NEW_CHANGES );
 699         };
 700
 701         /**
 702          * Save the current model state as a saved query
 703          *
 704          * @param {string} [label] Label of the saved query
 705          * @param {boolean} [setAsDefault=false] This query should be set as the default
 706          */
 707         mw.rcfilters.Controller.prototype.saveCurrentQuery = function ( label, setAsDefault ) {
 708                 // Add item
 709                 this.savedQueriesModel.addNewQuery(
 710                         label || mw.msg( 'rcfilters-savedqueries-defaultlabel' ),
 711                         this.filtersModel.getCurrentParameterState( true ),
 712                         setAsDefault
 713                 );
 714
 715                 // Save item
 716                 this._saveSavedQueries();
 717         };
 718
 719         /**
 720          * Remove a saved query
 721          *
 722          * @param {string} queryID Query id
 723          */
 724         mw.rcfilters.Controller.prototype.removeSavedQuery = function ( queryID ) {
 725                 this.savedQueriesModel.removeQuery( queryID );
 726
 727                 this._saveSavedQueries();
 728         };
 729
 730         /**
 731          * Rename a saved query
 732          *
 733          * @param {string} queryID Query id
 734          * @param {string} newLabel New label for the query
 735          */
 736         mw.rcfilters.Controller.prototype.renameSavedQuery = function ( queryID, newLabel ) {
 737                 var queryItem = this.savedQueriesModel.getItemByID( queryID );
 738
 739                 if ( queryItem ) {
 740                         queryItem.updateLabel( newLabel );
 741                 }
 742                 this._saveSavedQueries();
 743         };
 744
 745         /**
 746          * Set a saved query as default
 747          *
 748          * @param {string} queryID Query Id. If null is given, default
 749          *  query is reset.
 750          */
 751         mw.rcfilters.Controller.prototype.setDefaultSavedQuery = function ( queryID ) {
 752                 this.savedQueriesModel.setDefault( queryID );
 753                 this._saveSavedQueries();
 754         };
 755
 756         /**
 757          * Load a saved query
 758          *
 759          * @param {string} queryID Query id
 760          */
 761         mw.rcfilters.Controller.prototype.applySavedQuery = function ( queryID ) {
 762                 var currentMatchingQuery,
 763                         params = this.savedQueriesModel.getItemParams( queryID );
 764
 765                 currentMatchingQuery = this.findQueryMatchingCurrentState();
 766
 767                 if (
 768                         currentMatchingQuery &&
 769                         currentMatchingQuery.getID() === queryID
 770                 ) {
 771                         // If the query we want to load is the one that is already
 772                         // loaded, don't reload it
 773                         return;
 774                 }
 775
 776                 if ( this.applyParamChange( params ) ) {
 777                         // Update changes list only if there was a difference in filter selection
 778                         this.updateChangesList();
 779                 } else {
 780                         this.uriProcessor.updateURL( params );
 781                 }
 782
 783                 // Log filter grouping
 784                 this.trackFilterGroupings( 'savedfilters' );
 785         };
 786
 787         /**
 788          * Check whether the current filter and highlight state exists
 789          * in the saved queries model.
 790          *
 791          * @return {mw.rcfilters.dm.SavedQueryItemModel} Matching item model
 792          */
 793         mw.rcfilters.Controller.prototype.findQueryMatchingCurrentState = function () {
 794                 return this.savedQueriesModel.findMatchingQuery(
 795                         this.filtersModel.getCurrentParameterState( true )
 796                 );
 797         };
 798
 799         /**
 800          * Save the current state of the saved queries model with all
 801          * query item representation in the user settings.
 802          */
 803         mw.rcfilters.Controller.prototype._saveSavedQueries = function () {
 804                 var stringified, oldPrefValue,
 805                         backupPrefName = this.savedQueriesPreferenceName + '-versionbackup',
 806                         state = this.savedQueriesModel.getState();
 807
 808                 // Stringify state
 809                 stringified = JSON.stringify( state );
 810
 811                 if ( $.byteLength( stringified ) > 65535 ) {
 812                         // Sanity check, since the preference can only hold that.
 813                         return;
 814                 }
 815
 816                 if ( !this.wereSavedQueriesSaved && this.savedQueriesModel.isConverted() ) {
 817                         // The queries were converted from the previous version
 818                         // Keep the old string in the [prefname]-versionbackup
 819                         oldPrefValue = mw.user.options.get( this.savedQueriesPreferenceName );
 820
 821                         // Save the old preference in the backup preference
 822                         new mw.Api().saveOption( backupPrefName, oldPrefValue );
 823                         // Update the preference for this session
 824                         mw.user.options.set( backupPrefName, oldPrefValue );
 825                 }
 826
 827                 // Save the preference
 828                 new mw.Api().saveOption( this.savedQueriesPreferenceName, stringified );
 829                 // Update the preference for this session
 830                 mw.user.options.set( this.savedQueriesPreferenceName, stringified );
 831
 832                 // Tag as already saved so we don't do this again
 833                 this.wereSavedQueriesSaved = true;
 834         };
 835
 836         /**
 837          * Update sticky preferences with current model state
 838          */
 839         mw.rcfilters.Controller.prototype.updateStickyPreferences = function () {
 840                 // Update default sticky values with selected, whether they came from
 841                 // the initial defaults or from the URL value that is being normalized
 842                 this.updateDaysDefault( this.filtersModel.getGroup( 'days' ).getSelectedItems()[ 0 ].getParamName() );
 843                 this.updateLimitDefault( this.filtersModel.getGroup( 'limit' ).getSelectedItems()[ 0 ].getParamName() );
 844
 845                 // TODO: Make these automatic by having the model go over sticky
 846                 // items and update their default values automatically
 847         };
 848
 849         /**
 850          * Update the limit default value
 851          *
 852          * @param {number} newValue New value
 853          */
 854         mw.rcfilters.Controller.prototype.updateLimitDefault = function ( newValue ) {
 855                 this.updateNumericPreference( this.limitPreferenceName, newValue );
 856         };
 857
 858         /**
 859          * Update the days default value
 860          *
 861          * @param {number} newValue New value
 862          */
 863         mw.rcfilters.Controller.prototype.updateDaysDefault = function ( newValue ) {
 864                 this.updateNumericPreference( this.daysPreferenceName, newValue );
 865         };
 866
 867         /**
 868          * Update the group by page default value
 869          *
 870          * @param {boolean} newValue New value
 871          */
 872         mw.rcfilters.Controller.prototype.updateGroupByPageDefault = function ( newValue ) {
 873                 this.updateNumericPreference( 'usenewrc', Number( newValue ) );
 874         };
 875
 876         /**
 877          * Update a numeric preference with a new value
 878          *
 879          * @param {string} prefName Preference name
 880          * @param {number|string} newValue New value
 881          */
 882         mw.rcfilters.Controller.prototype.updateNumericPreference = function ( prefName, newValue ) {
 883                 if ( !$.isNumeric( newValue ) ) {
 884                         return;
 885                 }
 886
 887                 newValue = Number( newValue );
 888
 889                 if ( mw.user.options.get( prefName ) !== newValue ) {
 890                         // Save the preference
 891                         new mw.Api().saveOption( prefName, newValue );
 892                         // Update the preference for this session
 893                         mw.user.options.set( prefName, newValue );
 894                 }
 895         };
 896
 897         /**
 898          * Synchronize the URL with the current state of the filters
 899          * without adding an history entry.
 900          */
 901         mw.rcfilters.Controller.prototype.replaceUrl = function () {
 902                 this.uriProcessor.updateURL();
 903         };
 904
 905         /**
 906          * Update filter state (selection and highlighting) based
 907          * on current URL values.
 908          *
 909          * @param {boolean} [fetchChangesList=true] Fetch new results into the changes
 910          *  list based on the updated model.
 911          */
 912         mw.rcfilters.Controller.prototype.updateStateFromUrl = function ( fetchChangesList ) {
 913                 fetchChangesList = fetchChangesList === undefined ? true : !!fetchChangesList;
 914
 915                 this.uriProcessor.updateModelBasedOnQuery();
 916
 917                 // Update the sticky preferences, in case we received a value
 918                 // from the URL
 919                 this.updateStickyPreferences();
 920
 921                 // Only update and fetch new results if it is requested
 922                 if ( fetchChangesList ) {
 923                         this.updateChangesList();
 924                 }
 925         };
 926
 927         /**
 928          * Update the list of changes and notify the model
 929          *
 930          * @param {Object} [params] Extra parameters to add to the API call
 931          * @param {string} [updateMode='filterChange'] One of 'filterChange', 'liveUpdate', 'showNewChanges', 'markSeen'
 932          * @return {jQuery.Promise} Promise that is resolved when the update is complete
 933          */
 934         mw.rcfilters.Controller.prototype.updateChangesList = function ( params, updateMode ) {
 935                 updateMode = updateMode === undefined ? this.FILTER_CHANGE : updateMode;
 936
 937                 if ( updateMode === this.FILTER_CHANGE ) {
 938                         this.uriProcessor.updateURL( params );
 939                 }
 940                 if ( updateMode === this.FILTER_CHANGE || updateMode === this.SHOW_NEW_CHANGES ) {
 941                         this.changesListModel.invalidate();
 942                 }
 943                 this.changesListModel.setNewChangesExist( false );
 944                 this.updatingChangesList = true;
 945                 return this._fetchChangesList()
 946                         .then(
 947                                 // Success
 948                                 function ( pieces ) {
 949                                         var $changesListContent = pieces.changes,
 950                                                 $fieldset = pieces.fieldset;
 951                                         this.changesListModel.update(
 952                                                 $changesListContent,
 953                                                 $fieldset,
 954                                                 pieces.noResultsDetails,
 955                                                 false,
 956                                                 // separator between old and new changes
 957                                                 updateMode === this.SHOW_NEW_CHANGES || updateMode === this.LIVE_UPDATE
 958                                         );
 959                                 }.bind( this )
 960                                 // Do nothing for failure
 961                         )
 962                         .always( function () {
 963                                 this.updatingChangesList = false;
 964                         }.bind( this ) );
 965         };
 966
 967         /**
 968          * Get an object representing the default parameter state, whether
 969          * it is from the model defaults or from the saved queries.
 970          *
 971          * @return {Object} Default parameters
 972          */
 973         mw.rcfilters.Controller.prototype._getDefaultParams = function () {
 974                 if ( this.savedQueriesModel.getDefault() ) {
 975                         return this.savedQueriesModel.getDefaultParams();
 976                 } else {
 977                         return this.filtersModel.getDefaultParams();
 978                 }
 979         };
 980
 981         /**
 982          * Query the list of changes from the server for the current filters
 983          *
 984          * @param {string} counterId Id for this request. To allow concurrent requests
 985          *  not to invalidate each other.
 986          * @param {Object} [params={}] Parameters to add to the query
 987          *
 988          * @return {jQuery.Promise} Promise object resolved with { content, status }
 989          */
 990         mw.rcfilters.Controller.prototype._queryChangesList = function ( counterId, params ) {
 991                 var uri = this.uriProcessor.getUpdatedUri(),
 992                         stickyParams = this.filtersModel.getStickyParamsValues(),
 993                         requestId,
 994                         latestRequest;
 995
 996                 params = params || {};
 997                 params.action = 'render'; // bypasses MW chrome
 998
 999                 uri.extend( params );
1000
1001                 this.requestCounter[ counterId ] = this.requestCounter[ counterId ] || 0;
1002                 requestId = ++this.requestCounter[ counterId ];
1003                 latestRequest = function () {
1004                         return requestId === this.requestCounter[ counterId ];
1005                 }.bind( this );
1006
1007                 // Sticky parameters override the URL params
1008                 // this is to make sure that whether we represent
1009                 // the sticky params in the URL or not (they may
1010                 // be normalized out) the sticky parameters are
1011                 // always being sent to the server with their
1012                 // current/default values
1013                 uri.extend( stickyParams );
1014
1015                 return $.ajax( uri.toString(), { contentType: 'html' } )
1016                         .then(
1017                                 function ( content, message, jqXHR ) {
1018                                         if ( !latestRequest() ) {
1019                                                 return $.Deferred().reject();
1020                                         }
1021                                         return {
1022                                                 content: content,
1023                                                 status: jqXHR.status
1024                                         };
1025                                 },
1026                                 // RC returns 404 when there is no results
1027                                 function ( jqXHR ) {
1028                                         if ( latestRequest() ) {
1029                                                 return $.Deferred().resolve(
1030                                                         {
1031                                                                 content: jqXHR.responseText,
1032                                                                 status: jqXHR.status
1033                                                         }
1034                                                 ).promise();
1035                                         }
1036                                 }
1037                         );
1038         };
1039
1040         /**
1041          * Fetch the list of changes from the server for the current filters
1042          *
1043          * @return {jQuery.Promise} Promise object that will resolve with the changes list
1044          *  and the fieldset.
1045          */
1046         mw.rcfilters.Controller.prototype._fetchChangesList = function () {
1047                 return this._queryChangesList( 'updateChangesList' )
1048                         .then(
1049                                 function ( data ) {
1050                                         var $parsed;
1051
1052                                         // Status code 0 is not HTTP status code,
1053                                         // but is valid value of XMLHttpRequest status.
1054                                         // It is used for variety of network errors, for example
1055                                         // when an AJAX call was cancelled before getting the response
1056                                         if ( data && data.status === 0 ) {
1057                                                 return {
1058                                                         changes: 'NO_RESULTS',
1059                                                         // We need empty result set, to avoid exceptions because of undefined value
1060                                                         fieldset: $( [] ),
1061                                                         noResultsDetails: 'NO_RESULTS_NETWORK_ERROR'
1062                                                 };
1063                                         }
1064
1065                                         $parsed = $( '<div>' ).append( $( $.parseHTML(
1066                                                 data ? data.content : ''
1067                                         ) ) );
1068
1069                                         return this._extractChangesListInfo( $parsed, data.status );
1070                                 }.bind( this )
1071                         );
1072         };
1073
1074         /**
1075          * Track usage of highlight feature
1076          *
1077          * @param {string} action
1078          * @param {Array|Object|string} filters
1079          */
1080         mw.rcfilters.Controller.prototype._trackHighlight = function ( action, filters ) {
1081                 filters = typeof filters === 'string' ? { name: filters } : filters;
1082                 filters = !Array.isArray( filters ) ? [ filters ] : filters;
1083                 mw.track(
1084                         'event.ChangesListHighlights',
1085                         {
1086                                 action: action,
1087                                 filters: filters,
1088                                 userId: mw.user.getId()
1089                         }
1090                 );
1091         };
1092
1093         /**
1094          * Track filter grouping usage
1095          *
1096          * @param {string} action Action taken
1097          */
1098         mw.rcfilters.Controller.prototype.trackFilterGroupings = function ( action ) {
1099                 var controller = this,
1100                         rightNow = new Date().getTime(),
1101                         randomIdentifier = String( mw.user.sessionId() ) + String( rightNow ) + String( Math.random() ),
1102                         // Get all current filters
1103                         filters = this.filtersModel.getSelectedItems().map( function ( item ) {
1104                                 return item.getName();
1105                         } );
1106
1107                 action = action || 'filtermenu';
1108
1109                 // Check if these filters were the ones we just logged previously
1110                 // (Don't log the same grouping twice, in case the user opens/closes)
1111                 // the menu without action, or with the same result
1112                 if (
1113                         // Only log if the two arrays are different in size
1114                         filters.length !== this.prevLoggedItems.length ||
1115                         // Or if any filters are not the same as the cached filters
1116                         filters.some( function ( filterName ) {
1117                                 return controller.prevLoggedItems.indexOf( filterName ) === -1;
1118                         } ) ||
1119                         // Or if any cached filters are not the same as given filters
1120                         this.prevLoggedItems.some( function ( filterName ) {
1121                                 return filters.indexOf( filterName ) === -1;
1122                         } )
1123                 ) {
1124                         filters.forEach( function ( filterName ) {
1125                                 mw.track(
1126                                         'event.ChangesListFilterGrouping',
1127                                         {
1128                                                 action: action,
1129                                                 groupIdentifier: randomIdentifier,
1130                                                 filter: filterName,
1131                                                 userId: mw.user.getId()
1132                                         }
1133                                 );
1134                         } );
1135
1136                         // Cache the filter names
1137                         this.prevLoggedItems = filters;
1138                 }
1139         };
1140
1141         /**
1142          * Apply a change of parameters to the model state, and check whether
1143          * the new state is different than the old state.
1144          *
1145          * @param  {Object} newParamState New parameter state to apply
1146          * @return {boolean} New applied model state is different than the previous state
1147          */
1148         mw.rcfilters.Controller.prototype.applyParamChange = function ( newParamState ) {
1149                 var after,
1150                         before = this.filtersModel.getSelectedState();
1151
1152                 this.filtersModel.updateStateFromParams( newParamState );
1153
1154                 after = this.filtersModel.getSelectedState();
1155
1156                 return !OO.compare( before, after );
1157         };
1158
1159         /**
1160          * Mark all changes as seen on Watchlist
1161          */
1162         mw.rcfilters.Controller.prototype.markAllChangesAsSeen = function () {
1163                 var api = new mw.Api();
1164                 api.postWithToken( 'csrf', {
1165                         formatversion: 2,
1166                         action: 'setnotificationtimestamp',
1167                         entirewatchlist: true
1168                 } ).then( function () {
1169                         this.updateChangesList( null, 'markSeen' );
1170                 }.bind( this ) );
1171         };
1172 }( mediaWiki, jQuery ) );