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          */
  12         mw.rcfilters.Controller = function MwRcfiltersController( filtersModel, changesListModel, savedQueriesModel ) {
  13                 this.filtersModel = filtersModel;
  14                 this.changesListModel = changesListModel;
  15                 this.savedQueriesModel = savedQueriesModel;
  16                 this.requestCounter = {};
  17                 this.baseFilterState = {};
  18                 this.uriProcessor = null;
  19                 this.initializing = false;
  20
  21                 this.prevLoggedItems = [];
  22         };
  23
  24         /* Initialization */
  25         OO.initClass( mw.rcfilters.Controller );
  26
  27         /**
  28          * Initialize the filter and parameter states
  29          *
  30          * @param {Array} filterStructure Filter definition and structure for the model
  31          * @param {Object} [namespaceStructure] Namespace definition
  32          * @param {Object} [tagList] Tag definition
  33          */
  34         mw.rcfilters.Controller.prototype.initialize = function ( filterStructure, namespaceStructure, tagList ) {
  35                 var parsedSavedQueries, limitDefault,
  36                         displayConfig = mw.config.get( 'StructuredChangeFiltersDisplayConfig' ),
  37                         controller = this,
  38                         views = {},
  39                         items = [],
  40                         uri = new mw.Uri(),
  41                         $changesList = $( '.mw-changeslist' ).first().contents();
  42
  43                 // Prepare views
  44                 if ( namespaceStructure ) {
  45                         items = [];
  46                         $.each( namespaceStructure, function ( namespaceID, label ) {
  47                                 // Build and clean up the individual namespace items definition
  48                                 items.push( {
  49                                         name: namespaceID,
  50                                         label: label || mw.msg( 'blanknamespace' ),
  51                                         description: '',
  52                                         identifiers: [
  53                                                 ( namespaceID < 0 || namespaceID % 2 === 0 ) ?
  54                                                         'subject' : 'talk'
  55                                         ],
  56                                         cssClass: 'mw-changeslist-ns-' + namespaceID
  57                                 } );
  58                         } );
  59
  60                         views.namespaces = {
  61                                 title: mw.msg( 'namespaces' ),
  62                                 trigger: ':',
  63                                 groups: [ {
  64                                         // Group definition (single group)
  65                                         name: 'namespace', // parameter name is singular
  66                                         type: 'string_options',
  67                                         title: mw.msg( 'namespaces' ),
  68                                         labelPrefixKey: { 'default': 'rcfilters-tag-prefix-namespace', inverted: 'rcfilters-tag-prefix-namespace-inverted' },
  69                                         separator: ';',
  70                                         fullCoverage: true,
  71                                         filters: items
  72                                 } ]
  73                         };
  74                 }
  75                 if ( tagList ) {
  76                         views.tags = {
  77                                 title: mw.msg( 'rcfilters-view-tags' ),
  78                                 trigger: '#',
  79                                 groups: [ {
  80                                         // Group definition (single group)
  81                                         name: 'tagfilter', // Parameter name
  82                                         type: 'string_options',
  83                                         title: 'rcfilters-view-tags', // Message key
  84                                         labelPrefixKey: 'rcfilters-tag-prefix-tags',
  85                                         separator: '|',
  86                                         fullCoverage: false,
  87                                         filters: tagList
  88                                 } ]
  89                         };
  90                 }
  91
  92                 // Convert the default from the old preference
  93                 // since the limit preference actually affects more
  94                 // than just the RecentChanges page
  95                 limitDefault = Number( mw.user.options.get( 'rclimit', '50' ) );
  96
  97                 // Add parameter range operations
  98                 views.range = {
  99                         groups: [
 100                                 {
 101                                         name: 'limit',
 102                                         type: 'single_option',
 103                                         title: '', // Because it's a hidden group, this title actually appears nowhere
 104                                         hidden: true,
 105                                         allowArbitrary: true,
 106                                         validate: $.isNumeric,
 107                                         range: {
 108                                                 min: 0, // The server normalizes negative numbers to 0 results
 109                                                 max: 1000
 110                                         },
 111                                         sortFunc: function ( a, b ) { return Number( a.name ) - Number( b.name ); },
 112                                         'default': String( limitDefault ),
 113                                         // Temporarily making this not sticky until we resolve the problem
 114                                         // with the misleading preference. Note that if this is to be permanent
 115                                         // we should remove all sticky behavior methods completely
 116                                         // See T172156
 117                                         // isSticky: true,
 118                                         filters: displayConfig.limitArray.map( function ( num ) {
 119                                                 return controller._createFilterDataFromNumber( num, num );
 120                                         } )
 121                                 },
 122                                 {
 123                                         name: 'days',
 124                                         type: 'single_option',
 125                                         title: '', // Because it's a hidden group, this title actually appears nowhere
 126                                         hidden: true,
 127                                         allowArbitrary: true,
 128                                         validate: $.isNumeric,
 129                                         range: {
 130                                                 min: 0,
 131                                                 max: displayConfig.maxDays
 132                                         },
 133                                         sortFunc: function ( a, b ) { return Number( a.name ) - Number( b.name ); },
 134                                         numToLabelFunc: function ( i ) {
 135                                                 return Number( i ) < 1 ?
 136                                                         ( Number( i ) * 24 ).toFixed( 2 ) :
 137                                                         Number( i );
 138                                         },
 139                                         'default': mw.user.options.get( 'rcdays', '30' ),
 140                                         // Temporarily making this not sticky while limit is not sticky, see above
 141                                         // isSticky: true,
 142                                         filters: [
 143                                                 // Hours (1, 2, 6, 12)
 144                                                 0.04166, 0.0833, 0.25, 0.5
 145                                         // Days
 146                                         ].concat( displayConfig.daysArray )
 147                                                 .map( function ( num ) {
 148                                                         return controller._createFilterDataFromNumber(
 149                                                                 num,
 150                                                                 // Convert fractions of days to number of hours for the labels
 151                                                                 num < 1 ? Math.round( num * 24 ) : num
 152                                                         );
 153                                                 } )
 154                                 }
 155                         ]
 156                 };
 157
 158                 views.display = {
 159                         groups: [
 160                                 {
 161                                         name: 'display',
 162                                         type: 'boolean',
 163                                         title: '', // Because it's a hidden group, this title actually appears nowhere
 164                                         hidden: true,
 165                                         isSticky: true,
 166                                         filters: [
 167                                                 {
 168                                                         name: 'enhanced',
 169                                                         'default': String( mw.user.options.get( 'usenewrc', 0 ) )
 170                                                 }
 171                                         ]
 172                                 }
 173                         ]
 174                 };
 175
 176                 // Before we do anything, we need to see if we require additional items in the
 177                 // groups that have 'AllowArbitrary'. For the moment, those are only single_option
 178                 // groups; if we ever expand it, this might need further generalization:
 179                 $.each( views, function ( viewName, viewData ) {
 180                         viewData.groups.forEach( function ( groupData ) {
 181                                 var extraValues = [];
 182                                 if ( groupData.allowArbitrary ) {
 183                                         // If the value in the URI isn't in the group, add it
 184                                         if ( uri.query[ groupData.name ] !== undefined ) {
 185                                                 extraValues.push( uri.query[ groupData.name ] );
 186                                         }
 187                                         // If the default value isn't in the group, add it
 188                                         if ( groupData.default !== undefined ) {
 189                                                 extraValues.push( String( groupData.default ) );
 190                                         }
 191                                         controller.addNumberValuesToGroup( groupData, extraValues );
 192                                 }
 193                         } );
 194                 } );
 195
 196                 // Initialize the model
 197                 this.filtersModel.initializeFilters( filterStructure, views );
 198
 199                 this._buildBaseFilterState();
 200
 201                 this.uriProcessor = new mw.rcfilters.UriProcessor(
 202                         this.filtersModel
 203                 );
 204
 205                 try {
 206                         parsedSavedQueries = JSON.parse( mw.user.options.get( 'rcfilters-saved-queries' ) || '{}' );
 207                 } catch ( err ) {
 208                         parsedSavedQueries = {};
 209                 }
 210
 211                 // The queries are saved in a minimized state, so we need
 212                 // to send over the base state so the saved queries model
 213                 // can normalize them per each query item
 214                 this.savedQueriesModel.initialize(
 215                         parsedSavedQueries,
 216                         this._getBaseFilterState(),
 217                         // This is for backwards compatibility - delete all sticky filter states
 218                         Object.keys( this.filtersModel.getStickyFiltersState() )
 219                 );
 220
 221                 // Check whether we need to load defaults.
 222                 // We do this by checking whether the current URI query
 223                 // contains any parameters recognized by the system.
 224                 // If it does, we load the given state.
 225                 // If it doesn't, we have no values at all, and we assume
 226                 // the user loads the base-page and we load defaults.
 227                 // Defaults should only be applied on load (if necessary)
 228                 // or on request
 229                 this.initializing = true;
 230                 if (
 231                         this.savedQueriesModel.getDefault() &&
 232                         !this.uriProcessor.doesQueryContainRecognizedParams( uri.query )
 233                 ) {
 234                         // We have defaults from a saved query.
 235                         // We will load them straight-forward (as if
 236                         // they were clicked in the menu) so we trigger
 237                         // a full ajax request and change of URL
 238                         this.applySavedQuery( this.savedQueriesModel.getDefault() );
 239                 } else {
 240                         // There are either recognized parameters in the URL
 241                         // or there are none, but there is also no default
 242                         // saved query (so defaults are from the backend)
 243                         // We want to update the state but not fetch results
 244                         // again
 245                         this.updateStateFromUrl( false );
 246
 247                         // Update the changes list with the existing data
 248                         // so it gets processed
 249                         this.changesListModel.update(
 250                                 $changesList.length ? $changesList : 'NO_RESULTS',
 251                                 $( 'fieldset.rcoptions' ).first(),
 252                                 true // We're using existing DOM elements
 253                         );
 254                 }
 255
 256                 this.initializing = false;
 257                 this.switchView( 'default' );
 258
 259                 this._scheduleLiveUpdate();
 260         };
 261
 262         /**
 263          * Create filter data from a number, for the filters that are numerical value
 264          *
 265          * @param {Number} num Number
 266          * @param {Number} numForDisplay Number for the label
 267          * @return {Object} Filter data
 268          */
 269         mw.rcfilters.Controller.prototype._createFilterDataFromNumber = function ( num, numForDisplay ) {
 270                 return {
 271                         name: String( num ),
 272                         label: mw.language.convertNumber( numForDisplay )
 273                 };
 274         };
 275
 276         /**
 277          * Add an arbitrary values to groups that allow arbitrary values
 278          *
 279          * @param {Object} groupData Group data
 280          * @param {string|string[]} arbitraryValues An array of arbitrary values to add to the group
 281          */
 282         mw.rcfilters.Controller.prototype.addNumberValuesToGroup = function ( groupData, arbitraryValues ) {
 283                 var controller = this,
 284                         normalizeWithinRange = function ( range, val ) {
 285                                 if ( val < range.min ) {
 286                                         return range.min; // Min
 287                                 } else if ( val >= range.max ) {
 288                                         return range.max; // Max
 289                                 }
 290                                 return val;
 291                         };
 292
 293                 arbitraryValues = Array.isArray( arbitraryValues ) ? arbitraryValues : [ arbitraryValues ];
 294
 295                 // Normalize the arbitrary values and the default value for a range
 296                 if ( groupData.range ) {
 297                         arbitraryValues = arbitraryValues.map( function ( val ) {
 298                                 return normalizeWithinRange( groupData.range, val );
 299                         } );
 300
 301                         // Normalize the default, since that's user defined
 302                         if ( groupData.default !== undefined ) {
 303                                 groupData.default = String( normalizeWithinRange( groupData.range, groupData.default ) );
 304                         }
 305                 }
 306
 307                 // This is only true for single_option group
 308                 // We assume these are the only groups that will allow for
 309                 // arbitrary, since it doesn't make any sense for the other
 310                 // groups.
 311                 arbitraryValues.forEach( function ( val ) {
 312                         if (
 313                                 // If the group allows for arbitrary data
 314                                 groupData.allowArbitrary &&
 315                                 // and it is single_option (or string_options, but we
 316                                 // don't have cases of those yet, nor do we plan to)
 317                                 groupData.type === 'single_option' &&
 318                                 // and, if there is a validate method and it passes on
 319                                 // the data
 320                                 ( !groupData.validate || groupData.validate( val ) ) &&
 321                                 // but if that value isn't already in the definition
 322                                 groupData.filters
 323                                         .map( function ( filterData ) {
 324                                                 return String( filterData.name );
 325                                         } )
 326                                         .indexOf( String( val ) ) === -1
 327                         ) {
 328                                 // Add the filter information
 329                                 groupData.filters.push( controller._createFilterDataFromNumber(
 330                                         val,
 331                                         groupData.numToLabelFunc ?
 332                                                 groupData.numToLabelFunc( val ) :
 333                                                 val
 334                                 ) );
 335
 336                                 // If there's a sort function set up, re-sort the values
 337                                 if ( groupData.sortFunc ) {
 338                                         groupData.filters.sort( groupData.sortFunc );
 339                                 }
 340                         }
 341                 } );
 342         };
 343
 344         /**
 345          * Switch the view of the filters model
 346          *
 347          * @param {string} view Requested view
 348          */
 349         mw.rcfilters.Controller.prototype.switchView = function ( view ) {
 350                 this.filtersModel.switchView( view );
 351         };
 352
 353         /**
 354          * Reset to default filters
 355          */
 356         mw.rcfilters.Controller.prototype.resetToDefaults = function () {
 357                 this.uriProcessor.updateModelBasedOnQuery( this._getDefaultParams() );
 358
 359                 this.updateChangesList();
 360         };
 361
 362         /**
 363          * Empty all selected filters
 364          */
 365         mw.rcfilters.Controller.prototype.emptyFilters = function () {
 366                 var highlightedFilterNames = this.filtersModel
 367                         .getHighlightedItems()
 368                         .map( function ( filterItem ) { return { name: filterItem.getName() }; } );
 369
 370                 this.filtersModel.emptyAllFilters();
 371                 this.filtersModel.clearAllHighlightColors();
 372                 // Check all filter interactions
 373                 this.filtersModel.reassessFilterInteractions();
 374
 375                 this.updateChangesList();
 376
 377                 if ( highlightedFilterNames ) {
 378                         this._trackHighlight( 'clearAll', highlightedFilterNames );
 379                 }
 380         };
 381
 382         /**
 383          * Update the selected state of a filter
 384          *
 385          * @param {string} filterName Filter name
 386          * @param {boolean} [isSelected] Filter selected state
 387          */
 388         mw.rcfilters.Controller.prototype.toggleFilterSelect = function ( filterName, isSelected ) {
 389                 var filterItem = this.filtersModel.getItemByName( filterName );
 390
 391                 if ( !filterItem ) {
 392                         // If no filter was found, break
 393                         return;
 394                 }
 395
 396                 isSelected = isSelected === undefined ? !filterItem.isSelected() : isSelected;
 397
 398                 if ( filterItem.isSelected() !== isSelected ) {
 399                         this.filtersModel.toggleFilterSelected( filterName, isSelected );
 400
 401                         this.updateChangesList();
 402
 403                         // Check filter interactions
 404                         this.filtersModel.reassessFilterInteractions( filterItem );
 405                 }
 406         };
 407
 408         /**
 409          * Clear both highlight and selection of a filter
 410          *
 411          * @param {string} filterName Name of the filter item
 412          */
 413         mw.rcfilters.Controller.prototype.clearFilter = function ( filterName ) {
 414                 var filterItem = this.filtersModel.getItemByName( filterName ),
 415                         isHighlighted = filterItem.isHighlighted();
 416
 417                 if ( filterItem.isSelected() || isHighlighted ) {
 418                         this.filtersModel.clearHighlightColor( filterName );
 419                         this.filtersModel.toggleFilterSelected( filterName, false );
 420                         this.updateChangesList();
 421                         this.filtersModel.reassessFilterInteractions( filterItem );
 422
 423                         // Log filter grouping
 424                         this.trackFilterGroupings( 'removefilter' );
 425                 }
 426
 427                 if ( isHighlighted ) {
 428                         this._trackHighlight( 'clear', filterName );
 429                 }
 430         };
 431
 432         /**
 433          * Toggle the highlight feature on and off
 434          */
 435         mw.rcfilters.Controller.prototype.toggleHighlight = function () {
 436                 this.filtersModel.toggleHighlight();
 437                 this._updateURL();
 438
 439                 if ( this.filtersModel.isHighlightEnabled() ) {
 440                         mw.hook( 'RcFilters.highlight.enable' ).fire();
 441                 }
 442         };
 443
 444         /**
 445          * Toggle the namespaces inverted feature on and off
 446          */
 447         mw.rcfilters.Controller.prototype.toggleInvertedNamespaces = function () {
 448                 this.filtersModel.toggleInvertedNamespaces();
 449
 450                 if (
 451                         this.filtersModel.getFiltersByView( 'namespaces' )
 452                                 .filter( function ( filterItem ) {
 453                                         return filterItem.isSelected();
 454                                 } )
 455                                 .length
 456                 ) {
 457                         // Only re-fetch results if there are namespace items that are actually selected
 458                         this.updateChangesList();
 459                 }
 460         };
 461
 462         /**
 463          * Set the highlight color for a filter item
 464          *
 465          * @param {string} filterName Name of the filter item
 466          * @param {string} color Selected color
 467          */
 468         mw.rcfilters.Controller.prototype.setHighlightColor = function ( filterName, color ) {
 469                 this.filtersModel.setHighlightColor( filterName, color );
 470                 this._updateURL();
 471                 this._trackHighlight( 'set', { name: filterName, color: color } );
 472         };
 473
 474         /**
 475          * Clear highlight for a filter item
 476          *
 477          * @param {string} filterName Name of the filter item
 478          */
 479         mw.rcfilters.Controller.prototype.clearHighlightColor = function ( filterName ) {
 480                 this.filtersModel.clearHighlightColor( filterName );
 481                 this._updateURL();
 482                 this._trackHighlight( 'clear', filterName );
 483         };
 484
 485         /**
 486          * Enable or disable live updates.
 487          * @param {boolean} enable True to enable, false to disable
 488          */
 489         mw.rcfilters.Controller.prototype.toggleLiveUpdate = function ( enable ) {
 490                 this.changesListModel.toggleLiveUpdate( enable );
 491                 if ( this.changesListModel.getLiveUpdate() && this.changesListModel.getNewChangesExist() ) {
 492                         this.showNewChanges();
 493                 }
 494         };
 495
 496         /**
 497          * Set a timeout for the next live update.
 498          * @private
 499          */
 500         mw.rcfilters.Controller.prototype._scheduleLiveUpdate = function () {
 501                 setTimeout( this._doLiveUpdate.bind( this ), 3000 );
 502         };
 503
 504         /**
 505          * Perform a live update.
 506          * @private
 507          */
 508         mw.rcfilters.Controller.prototype._doLiveUpdate = function () {
 509                 if ( !this._shouldCheckForNewChanges() ) {
 510                         // skip this turn and check back later
 511                         this._scheduleLiveUpdate();
 512                         return;
 513                 }
 514
 515                 this._checkForNewChanges()
 516                         .then( function ( data ) {
 517                                 if ( !this._shouldCheckForNewChanges() ) {
 518                                         // by the time the response is received,
 519                                         // it may not be appropriate anymore
 520                                         return;
 521                                 }
 522
 523                                 if ( data.changes !== 'NO_RESULTS' ) {
 524                                         if ( this.changesListModel.getLiveUpdate() ) {
 525                                                 return this.updateChangesList( false, null, true, false );
 526                                         } else {
 527                                                 this.changesListModel.setNewChangesExist( true );
 528                                         }
 529                                 }
 530                         }.bind( this ) )
 531                         .always( this._scheduleLiveUpdate.bind( this ) );
 532         };
 533
 534         /**
 535          * @return {boolean} It's appropriate to check for new changes now
 536          * @private
 537          */
 538         mw.rcfilters.Controller.prototype._shouldCheckForNewChanges = function () {
 539                 var liveUpdateFeatureFlag = mw.config.get( 'wgStructuredChangeFiltersEnableLiveUpdate' ) ||
 540                         new mw.Uri().query.liveupdate;
 541
 542                 return !document.hidden &&
 543                         !this.changesListModel.getNewChangesExist() &&
 544                         !this.updatingChangesList &&
 545                         liveUpdateFeatureFlag;
 546         };
 547
 548         /**
 549          * Check if new changes, newer than those currently shown, are available
 550          *
 551          * @return {jQuery.Promise} Promise object that resolves after trying
 552          * to fetch 1 change newer than the last known 'from' parameter value
 553          *
 554          * @private
 555          */
 556         mw.rcfilters.Controller.prototype._checkForNewChanges = function () {
 557                 return this._fetchChangesList(
 558                         'liveUpdate',
 559                         {
 560                                 limit: 1,
 561                                 from: this.changesListModel.getNextFrom()
 562                         }
 563                 );
 564         };
 565
 566         /**
 567          * Show the new changes
 568          *
 569          * @return {jQuery.Promise} Promise object that resolves after
 570          * fetching and showing the new changes
 571          */
 572         mw.rcfilters.Controller.prototype.showNewChanges = function () {
 573                 return this.updateChangesList( false, null, true, true );
 574         };
 575
 576         /**
 577          * Save the current model state as a saved query
 578          *
 579          * @param {string} [label] Label of the saved query
 580          * @param {boolean} [setAsDefault=false] This query should be set as the default
 581          */
 582         mw.rcfilters.Controller.prototype.saveCurrentQuery = function ( label, setAsDefault ) {
 583                 var queryID,
 584                         highlightedItems = {},
 585                         highlightEnabled = this.filtersModel.isHighlightEnabled(),
 586                         selectedState = this.filtersModel.getSelectedState();
 587
 588                 // Prepare highlights
 589                 this.filtersModel.getHighlightedItems().forEach( function ( item ) {
 590                         highlightedItems[ item.getName() ] = highlightEnabled ?
 591                                 item.getHighlightColor() : null;
 592                 } );
 593                 // These are filter states; highlight is stored as boolean
 594                 highlightedItems.highlight = this.filtersModel.isHighlightEnabled();
 595
 596                 // Delete all sticky filters
 597                 this._deleteStickyValuesFromFilterState( selectedState );
 598
 599                 // Add item
 600                 queryID = this.savedQueriesModel.addNewQuery(
 601                         label || mw.msg( 'rcfilters-savedqueries-defaultlabel' ),
 602                         {
 603                                 filters: selectedState,
 604                                 highlights: highlightedItems,
 605                                 invert: this.filtersModel.areNamespacesInverted()
 606                         }
 607                 );
 608
 609                 if ( setAsDefault ) {
 610                         this.savedQueriesModel.setDefault( queryID );
 611                 }
 612
 613                 // Save item
 614                 this._saveSavedQueries();
 615         };
 616
 617         /**
 618          * Remove a saved query
 619          *
 620          * @param {string} queryID Query id
 621          */
 622         mw.rcfilters.Controller.prototype.removeSavedQuery = function ( queryID ) {
 623                 this.savedQueriesModel.removeQuery( queryID );
 624
 625                 this._saveSavedQueries();
 626         };
 627
 628         /**
 629          * Rename a saved query
 630          *
 631          * @param {string} queryID Query id
 632          * @param {string} newLabel New label for the query
 633          */
 634         mw.rcfilters.Controller.prototype.renameSavedQuery = function ( queryID, newLabel ) {
 635                 var queryItem = this.savedQueriesModel.getItemByID( queryID );
 636
 637                 if ( queryItem ) {
 638                         queryItem.updateLabel( newLabel );
 639                 }
 640                 this._saveSavedQueries();
 641         };
 642
 643         /**
 644          * Set a saved query as default
 645          *
 646          * @param {string} queryID Query Id. If null is given, default
 647          *  query is reset.
 648          */
 649         mw.rcfilters.Controller.prototype.setDefaultSavedQuery = function ( queryID ) {
 650                 this.savedQueriesModel.setDefault( queryID );
 651                 this._saveSavedQueries();
 652         };
 653
 654         /**
 655          * Load a saved query
 656          *
 657          * @param {string} queryID Query id
 658          */
 659         mw.rcfilters.Controller.prototype.applySavedQuery = function ( queryID ) {
 660                 var data, highlights,
 661                         queryItem = this.savedQueriesModel.getItemByID( queryID ),
 662                         currentMatchingQuery = this.findQueryMatchingCurrentState();
 663
 664                 if (
 665                         queryItem &&
 666                         (
 667                                 // If there's already a query, don't reload it
 668                                 // if it's the same as the one that already exists
 669                                 !currentMatchingQuery ||
 670                                 currentMatchingQuery.getID() !== queryItem.getID()
 671                         )
 672                 ) {
 673                         data = queryItem.getData();
 674                         highlights = data.highlights;
 675
 676                         // Backwards compatibility; initial version mispelled 'highlight' with 'highlights'
 677                         highlights.highlight = highlights.highlights || highlights.highlight;
 678
 679                         // Update model state from filters
 680                         this.filtersModel.toggleFiltersSelected(
 681                                 // Merge filters with sticky values
 682                                 $.extend( true, {}, data.filters, this.filtersModel.getStickyFiltersState() )
 683                         );
 684
 685                         // Update namespace inverted property
 686                         this.filtersModel.toggleInvertedNamespaces( !!Number( data.invert ) );
 687
 688                         // Update highlight state
 689                         this.filtersModel.toggleHighlight( !!Number( highlights.highlight ) );
 690                         this.filtersModel.getItems().forEach( function ( filterItem ) {
 691                                 var color = highlights[ filterItem.getName() ];
 692                                 if ( color ) {
 693                                         filterItem.setHighlightColor( color );
 694                                 } else {
 695                                         filterItem.clearHighlightColor();
 696                                 }
 697                         } );
 698
 699                         // Check all filter interactions
 700                         this.filtersModel.reassessFilterInteractions();
 701
 702                         this.updateChangesList();
 703
 704                         // Log filter grouping
 705                         this.trackFilterGroupings( 'savedfilters' );
 706                 }
 707         };
 708
 709         /**
 710          * Check whether the current filter and highlight state exists
 711          * in the saved queries model.
 712          *
 713          * @return {boolean} Query exists
 714          */
 715         mw.rcfilters.Controller.prototype.findQueryMatchingCurrentState = function () {
 716                 var highlightedItems = {},
 717                         selectedState = this.filtersModel.getSelectedState();
 718
 719                 // Prepare highlights of the current query
 720                 this.filtersModel.getItemsSupportingHighlights().forEach( function ( item ) {
 721                         highlightedItems[ item.getName() ] = item.getHighlightColor();
 722                 } );
 723                 highlightedItems.highlight = this.filtersModel.isHighlightEnabled();
 724
 725                 // Remove sticky filters
 726                 this._deleteStickyValuesFromFilterState( selectedState );
 727
 728                 return this.savedQueriesModel.findMatchingQuery(
 729                         {
 730                                 filters: selectedState,
 731                                 highlights: highlightedItems,
 732                                 invert: this.filtersModel.areNamespacesInverted()
 733                         }
 734                 );
 735         };
 736
 737         /**
 738          * Delete sticky filters from given object
 739          *
 740          * @param {Object} filterState Filter state
 741          */
 742         mw.rcfilters.Controller.prototype._deleteStickyValuesFromFilterState = function ( filterState ) {
 743                 // Remove sticky filters
 744                 $.each( this.filtersModel.getStickyFiltersState(), function ( filterName ) {
 745                         delete filterState[ filterName ];
 746                 } );
 747         };
 748
 749         /**
 750          * Get an object representing the base state of parameters
 751          * and highlights.
 752          *
 753          * This is meant to make sure that the saved queries that are
 754          * in memory are always the same structure as what we would get
 755          * by calling the current model's "getSelectedState" and by checking
 756          * highlight items.
 757          *
 758          * In cases where a user saved a query when the system had a certain
 759          * set of filters, and then a filter was added to the system, we want
 760          * to make sure that the stored queries can still be comparable to
 761          * the current state, which means that we need the base state for
 762          * two operations:
 763          *
 764          * - Saved queries are stored in "minimal" view (only changed filters
 765          *   are stored); When we initialize the system, we merge each minimal
 766          *   query with the base state (using 'getNormalizedFilters') so all
 767          *   saved queries have the exact same structure as what we would get
 768          *   by checking the getSelectedState of the filter.
 769          * - When we save the queries, we minimize the object to only represent
 770          *   whatever has actually changed, rather than store the entire
 771          *   object. To check what actually is different so we can store it,
 772          *   we need to obtain a base state to compare against, this is
 773          *   what #_getMinimalFilterList does
 774          */
 775         mw.rcfilters.Controller.prototype._buildBaseFilterState = function () {
 776                 var defaultParams = this.filtersModel.getDefaultParams(),
 777                         highlightedItems = {};
 778
 779                 // Prepare highlights
 780                 this.filtersModel.getItemsSupportingHighlights().forEach( function ( item ) {
 781                         highlightedItems[ item.getName() ] = null;
 782                 } );
 783                 highlightedItems.highlight = false;
 784
 785                 this.baseFilterState = {
 786                         filters: this.filtersModel.getFiltersFromParameters( defaultParams ),
 787                         highlights: highlightedItems,
 788                         invert: false
 789                 };
 790         };
 791
 792         /**
 793          * Get an object representing the base filter state of both
 794          * filters and highlights. The structure is similar to what we use
 795          * to store each query in the saved queries object:
 796          * {
 797          *    filters: {
 798          *        filterName: (bool)
 799          *    },
 800          *    highlights: {
 801          *        filterName: (string|null)
 802          *    }
 803          * }
 804          *
 805          * @return {Object} Object representing the base state of
 806          *  parameters and highlights
 807          */
 808         mw.rcfilters.Controller.prototype._getBaseFilterState = function () {
 809                 return this.baseFilterState;
 810         };
 811
 812         /**
 813          * Get an object that holds only the parameters and highlights that have
 814          * values different than the base default value.
 815          *
 816          * This is the reverse of the normalization we do initially on loading and
 817          * initializing the saved queries model.
 818          *
 819          * @param {Object} valuesObject Object representing the state of both
 820          *  filters and highlights in its normalized version, to be minimized.
 821          * @return {Object} Minimal filters and highlights list
 822          */
 823         mw.rcfilters.Controller.prototype._getMinimalFilterList = function ( valuesObject ) {
 824                 var result = { filters: {}, highlights: {} },
 825                         baseState = this._getBaseFilterState();
 826
 827                 // XOR results
 828                 $.each( valuesObject.filters, function ( name, value ) {
 829                         if ( baseState.filters !== undefined && baseState.filters[ name ] !== value ) {
 830                                 result.filters[ name ] = value;
 831                         }
 832                 } );
 833
 834                 $.each( valuesObject.highlights, function ( name, value ) {
 835                         if ( baseState.highlights !== undefined && baseState.highlights[ name ] !== value ) {
 836                                 result.highlights[ name ] = value;
 837                         }
 838                 } );
 839
 840                 return result;
 841         };
 842
 843         /**
 844          * Save the current state of the saved queries model with all
 845          * query item representation in the user settings.
 846          */
 847         mw.rcfilters.Controller.prototype._saveSavedQueries = function () {
 848                 var stringified,
 849                         state = this.savedQueriesModel.getState(),
 850                         controller = this;
 851
 852                 // Minimize before save
 853                 $.each( state.queries, function ( queryID, info ) {
 854                         state.queries[ queryID ].data = controller._getMinimalFilterList( info.data );
 855                 } );
 856
 857                 // Stringify state
 858                 stringified = JSON.stringify( state );
 859
 860                 if ( stringified.length > 65535 ) {
 861                         // Sanity check, since the preference can only hold that.
 862                         return;
 863                 }
 864
 865                 // Save the preference
 866                 new mw.Api().saveOption( 'rcfilters-saved-queries', stringified );
 867                 // Update the preference for this session
 868                 mw.user.options.set( 'rcfilters-saved-queries', stringified );
 869         };
 870
 871         /**
 872          * Update sticky preferences with current model state
 873          */
 874         mw.rcfilters.Controller.prototype.updateStickyPreferences = function () {
 875                 // Update default sticky values with selected, whether they came from
 876                 // the initial defaults or from the URL value that is being normalized
 877                 this.updateDaysDefault( this.filtersModel.getGroup( 'days' ).getSelectedItems()[ 0 ].getParamName() );
 878                 this.updateLimitDefault( this.filtersModel.getGroup( 'limit' ).getSelectedItems()[ 0 ].getParamName() );
 879
 880                 // TODO: Make these automatic by having the model go over sticky
 881                 // items and update their default values automatically
 882         };
 883
 884         /**
 885          * Update the limit default value
 886          *
 887          * param {number} newValue New value
 888          */
 889         mw.rcfilters.Controller.prototype.updateLimitDefault = function ( /* newValue */ ) {
 890                 // HACK: Temporarily remove this from being sticky
 891                 // See T172156
 892
 893                 /*
 894                 if ( !$.isNumeric( newValue ) ) {
 895                         return;
 896                 }
 897
 898                 newValue = Number( newValue );
 899
 900                 if ( mw.user.options.get( 'rcfilters-rclimit' ) !== newValue ) {
 901                         // Save the preference
 902                         new mw.Api().saveOption( 'rcfilters-rclimit', newValue );
 903                         // Update the preference for this session
 904                         mw.user.options.set( 'rcfilters-rclimit', newValue );
 905                 }
 906                 */
 907                 return;
 908         };
 909
 910         /**
 911          * Update the days default value
 912          *
 913          * param {number} newValue New value
 914          */
 915         mw.rcfilters.Controller.prototype.updateDaysDefault = function ( /* newValue */ ) {
 916                 // HACK: Temporarily remove this from being sticky
 917                 // See T172156
 918
 919                 /*
 920                 if ( !$.isNumeric( newValue ) ) {
 921                         return;
 922                 }
 923
 924                 newValue = Number( newValue );
 925
 926                 if ( mw.user.options.get( 'rcdays' ) !== newValue ) {
 927                         // Save the preference
 928                         new mw.Api().saveOption( 'rcdays', newValue );
 929                         // Update the preference for this session
 930                         mw.user.options.set( 'rcdays', newValue );
 931                 }
 932                 */
 933                 return;
 934         };
 935
 936         /**
 937          * Update the group by page default value
 938          *
 939          * @param {number} newValue New value
 940          */
 941         mw.rcfilters.Controller.prototype.updateGroupByPageDefault = function ( newValue ) {
 942                 if ( !$.isNumeric( newValue ) ) {
 943                         return;
 944                 }
 945
 946                 newValue = Number( newValue );
 947
 948                 if ( mw.user.options.get( 'usenewrc' ) !== newValue ) {
 949                         // Save the preference
 950                         new mw.Api().saveOption( 'usenewrc', newValue );
 951                         // Update the preference for this session
 952                         mw.user.options.set( 'usenewrc', newValue );
 953                 }
 954         };
 955
 956         /**
 957          * Synchronize the URL with the current state of the filters
 958          * without adding an history entry.
 959          */
 960         mw.rcfilters.Controller.prototype.replaceUrl = function () {
 961                 mw.rcfilters.UriProcessor.static.replaceState( this._getUpdatedUri() );
 962         };
 963
 964         /**
 965          * Update filter state (selection and highlighting) based
 966          * on current URL values.
 967          *
 968          * @param {boolean} [fetchChangesList=true] Fetch new results into the changes
 969          *  list based on the updated model.
 970          */
 971         mw.rcfilters.Controller.prototype.updateStateFromUrl = function ( fetchChangesList ) {
 972                 fetchChangesList = fetchChangesList === undefined ? true : !!fetchChangesList;
 973
 974                 this.uriProcessor.updateModelBasedOnQuery( new mw.Uri().query );
 975
 976                 // Update the sticky preferences, in case we received a value
 977                 // from the URL
 978                 this.updateStickyPreferences();
 979
 980                 // Only update and fetch new results if it is requested
 981                 if ( fetchChangesList ) {
 982                         this.updateChangesList();
 983                 }
 984         };
 985
 986         /**
 987          * Update the list of changes and notify the model
 988          *
 989          * @param {boolean} [updateUrl=true] Whether the URL should be updated with the current state of the filters
 990          * @param {Object} [params] Extra parameters to add to the API call
 991          * @param {boolean} [isLiveUpdate=false] The purpose of this update is to show new results for the same filters
 992          * @param {boolean} [invalidateCurrentChanges=true] Invalidate current changes by default (show spinner)
 993          * @return {jQuery.Promise} Promise that is resolved when the update is complete
 994          */
 995         mw.rcfilters.Controller.prototype.updateChangesList = function ( updateUrl, params, isLiveUpdate, invalidateCurrentChanges ) {
 996                 updateUrl = updateUrl === undefined ? true : updateUrl;
 997                 invalidateCurrentChanges = invalidateCurrentChanges === undefined ? true : invalidateCurrentChanges;
 998                 if ( updateUrl ) {
 999                         this._updateURL( params );
1000                 }
1001                 if ( invalidateCurrentChanges ) {
1002                         this.changesListModel.invalidate();
1003                 }
1004                 this.changesListModel.setNewChangesExist( false );
1005                 this.updatingChangesList = true;
1006                 return this._fetchChangesList()
1007                         .then(
1008                                 // Success
1009                                 function ( pieces ) {
1010                                         var $changesListContent = pieces.changes,
1011                                                 $fieldset = pieces.fieldset;
1012                                         this.changesListModel.update( $changesListContent, $fieldset, false, isLiveUpdate );
1013                                 }.bind( this )
1014                                 // Do nothing for failure
1015                         )
1016                         .always( function () {
1017                                 this.updatingChangesList = false;
1018                         }.bind( this ) );
1019         };
1020
1021         /**
1022          * Get an object representing the default parameter state, whether
1023          * it is from the model defaults or from the saved queries.
1024          *
1025          * @return {Object} Default parameters
1026          */
1027         mw.rcfilters.Controller.prototype._getDefaultParams = function () {
1028                 var data, queryHighlights,
1029                         savedParams = {},
1030                         savedHighlights = {},
1031                         defaultSavedQueryItem = this.savedQueriesModel.getItemByID( this.savedQueriesModel.getDefault() );
1032
1033                 if ( defaultSavedQueryItem ) {
1034                         data = defaultSavedQueryItem.getData();
1035
1036                         queryHighlights = data.highlights || {};
1037                         savedParams = this.filtersModel.getParametersFromFilters(
1038                                 // Merge filters with sticky values
1039                                 $.extend( true, {}, data.filters, this.filtersModel.getStickyFiltersState() )
1040                         );
1041
1042                         // Translate highlights to parameters
1043                         savedHighlights.highlight = String( Number( queryHighlights.highlight ) );
1044                         $.each( queryHighlights, function ( filterName, color ) {
1045                                 if ( filterName !== 'highlights' ) {
1046                                         savedHighlights[ filterName + '_color' ] = color;
1047                                 }
1048                         } );
1049
1050                         return $.extend( true, {}, savedParams, savedHighlights );
1051                 }
1052
1053                 return this.filtersModel.getDefaultParams();
1054         };
1055
1056         /**
1057          * Update the URL of the page to reflect current filters
1058          *
1059          * This should not be called directly from outside the controller.
1060          * If an action requires changing the URL, it should either use the
1061          * highlighting actions below, or call #updateChangesList which does
1062          * the uri corrections already.
1063          *
1064          * @param {Object} [params] Extra parameters to add to the API call
1065          */
1066         mw.rcfilters.Controller.prototype._updateURL = function ( params ) {
1067                 var currentUri = new mw.Uri(),
1068                         updatedUri = this._getUpdatedUri();
1069
1070                 updatedUri.extend( params || {} );
1071
1072                 if (
1073                         this.uriProcessor.getVersion( currentUri.query ) !== 2 ||
1074                         this.uriProcessor.isNewState( currentUri.query, updatedUri.query )
1075                 ) {
1076                         mw.rcfilters.UriProcessor.static.replaceState( updatedUri );
1077                 }
1078         };
1079
1080         /**
1081          * Get an updated mw.Uri object based on the model state
1082          *
1083          * @return {mw.Uri} Updated Uri
1084          */
1085         mw.rcfilters.Controller.prototype._getUpdatedUri = function () {
1086                 var uri = new mw.Uri();
1087
1088                 // Minimize url
1089                 uri.query = this.uriProcessor.minimizeQuery(
1090                         $.extend(
1091                                 true,
1092                                 {},
1093                                 // We want to retain unrecognized params
1094                                 // The uri params from model will override
1095                                 // any recognized value in the current uri
1096                                 // query, retain unrecognized params, and
1097                                 // the result will then be minimized
1098                                 uri.query,
1099                                 this.uriProcessor.getUriParametersFromModel(),
1100                                 { urlversion: '2' }
1101                         )
1102                 );
1103
1104                 return uri;
1105         };
1106
1107         /**
1108          * Fetch the list of changes from the server for the current filters
1109          *
1110          * @param {string} [counterId='updateChangesList'] Id for this request. To allow concurrent requests
1111          *  not to invalidate each other.
1112          * @param {Object} [params={}] Parameters to add to the query
1113          *
1114          * @return {jQuery.Promise} Promise object that will resolve with the changes list
1115          *  or with a string denoting no results.
1116          */
1117         mw.rcfilters.Controller.prototype._fetchChangesList = function ( counterId, params ) {
1118                 var uri = this._getUpdatedUri(),
1119                         stickyParams = this.filtersModel.getStickyParams(),
1120                         requestId,
1121                         latestRequest;
1122
1123                 counterId = counterId || 'updateChangesList';
1124                 params = params || {};
1125
1126                 uri.extend( params );
1127
1128                 this.requestCounter[ counterId ] = this.requestCounter[ counterId ] || 0;
1129                 requestId = ++this.requestCounter[ counterId ];
1130                 latestRequest = function () {
1131                         return requestId === this.requestCounter[ counterId ];
1132                 }.bind( this );
1133
1134                 // Sticky parameters override the URL params
1135                 // this is to make sure that whether we represent
1136                 // the sticky params in the URL or not (they may
1137                 // be normalized out) the sticky parameters are
1138                 // always being sent to the server with their
1139                 // current/default values
1140                 uri.extend( stickyParams );
1141
1142                 return $.ajax( uri.toString(), { contentType: 'html' } )
1143                         .then(
1144                                 // Success
1145                                 function ( html ) {
1146                                         var $parsed;
1147                                         if ( !latestRequest() ) {
1148                                                 return $.Deferred().reject();
1149                                         }
1150
1151                                         $parsed = $( $.parseHTML( html ) );
1152
1153                                         return {
1154                                                 // Changes list
1155                                                 changes: $parsed.find( '.mw-changeslist' ).first().contents(),
1156                                                 // Fieldset
1157                                                 fieldset: $parsed.find( 'fieldset.rcoptions' ).first()
1158                                         };
1159                                 },
1160                                 // Failure
1161                                 function ( responseObj ) {
1162                                         var $parsed;
1163
1164                                         if ( !latestRequest() ) {
1165                                                 return $.Deferred().reject();
1166                                         }
1167
1168                                         $parsed = $( $.parseHTML( responseObj.responseText ) );
1169
1170                                         // Force a resolve state to this promise
1171                                         return $.Deferred().resolve( {
1172                                                 changes: 'NO_RESULTS',
1173                                                 fieldset: $parsed.find( 'fieldset.rcoptions' ).first()
1174                                         } ).promise();
1175                                 }
1176                         );
1177         };
1178
1179         /**
1180          * Track usage of highlight feature
1181          *
1182          * @param {string} action
1183          * @param {Array|Object|string} filters
1184          */
1185         mw.rcfilters.Controller.prototype._trackHighlight = function ( action, filters ) {
1186                 filters = typeof filters === 'string' ? { name: filters } : filters;
1187                 filters = !Array.isArray( filters ) ? [ filters ] : filters;
1188                 mw.track(
1189                         'event.ChangesListHighlights',
1190                         {
1191                                 action: action,
1192                                 filters: filters,
1193                                 userId: mw.user.getId()
1194                         }
1195                 );
1196         };
1197
1198         /**
1199          * Track filter grouping usage
1200          *
1201          * @param {string} action Action taken
1202          */
1203         mw.rcfilters.Controller.prototype.trackFilterGroupings = function ( action ) {
1204                 var controller = this,
1205                         rightNow = new Date().getTime(),
1206                         randomIdentifier = String( mw.user.sessionId() ) + String( rightNow ) + String( Math.random() ),
1207                         // Get all current filters
1208                         filters = this.filtersModel.getSelectedItems().map( function ( item ) {
1209                                 return item.getName();
1210                         } );
1211
1212                 action = action || 'filtermenu';
1213
1214                 // Check if these filters were the ones we just logged previously
1215                 // (Don't log the same grouping twice, in case the user opens/closes)
1216                 // the menu without action, or with the same result
1217                 if (
1218                         // Only log if the two arrays are different in size
1219                         filters.length !== this.prevLoggedItems.length ||
1220                         // Or if any filters are not the same as the cached filters
1221                         filters.some( function ( filterName ) {
1222                                 return controller.prevLoggedItems.indexOf( filterName ) === -1;
1223                         } ) ||
1224                         // Or if any cached filters are not the same as given filters
1225                         this.prevLoggedItems.some( function ( filterName ) {
1226                                 return filters.indexOf( filterName ) === -1;
1227                         } )
1228                 ) {
1229                         filters.forEach( function ( filterName ) {
1230                                 mw.track(
1231                                         'event.ChangesListFilterGrouping',
1232                                         {
1233                                                 action: action,
1234                                                 groupIdentifier: randomIdentifier,
1235                                                 filter: filterName,
1236                                                 userId: mw.user.getId()
1237                                         }
1238                                 );
1239                         } );
1240
1241                         // Cache the filter names
1242                         this.prevLoggedItems = filters;
1243                 }
1244         };
1245 }( mediaWiki, jQuery ) );