resources/src/mediawiki.rcfilters/dm/mw.rcfilters.dm.SavedQueriesModel.js

   1 ( function ( mw, $ ) {
   2         /**
   3          * View model for saved queries
   4          *
   5          * @class
   6          * @mixins OO.EventEmitter
   7          * @mixins OO.EmitterList
   8          *
   9          * @constructor
  10          * @param {mw.rcfilters.dm.FiltersViewModel} filtersModel Filters model
  11          * @param {Object} [config] Configuration options
  12          * @cfg {string} [default] Default query ID
  13          */
  14         mw.rcfilters.dm.SavedQueriesModel = function MwRcfiltersDmSavedQueriesModel( filtersModel, config ) {
  15                 config = config || {};
  16
  17                 // Mixin constructor
  18                 OO.EventEmitter.call( this );
  19                 OO.EmitterList.call( this );
  20
  21                 this.default = config.default;
  22                 this.filtersModel = filtersModel;
  23                 this.converted = false;
  24
  25                 // Events
  26                 this.aggregate( { update: 'itemUpdate' } );
  27         };
  28
  29         /* Initialization */
  30
  31         OO.initClass( mw.rcfilters.dm.SavedQueriesModel );
  32         OO.mixinClass( mw.rcfilters.dm.SavedQueriesModel, OO.EventEmitter );
  33         OO.mixinClass( mw.rcfilters.dm.SavedQueriesModel, OO.EmitterList );
  34
  35         /* Events */
  36
  37         /**
  38          * @event initialize
  39          *
  40          * Model is initialized
  41          */
  42
  43         /**
  44          * @event itemUpdate
  45          * @param {mw.rcfilters.dm.SavedQueryItemModel} Changed item
  46          *
  47          * An item has changed
  48          */
  49
  50         /**
  51          * @event default
  52          * @param {string} New default ID
  53          *
  54          * The default has changed
  55          */
  56
  57         /* Methods */
  58
  59         /**
  60          * Initialize the saved queries model by reading it from the user's settings.
  61          * The structure of the saved queries is:
  62          * {
  63          *    version: (string) Version number; if version 2, the query represents
  64          *             parameters. Otherwise, the older version represented filters
  65          *             and needs to be readjusted,
  66          *    default: (string) Query ID
  67          *    queries:{
  68          *       query_id_1: {
  69          *          data:{
  70          *             filters: (Object) Minimal definition of the filters
  71          *             highlights: (Object) Definition of the highlights
  72          *          },
  73          *          label: (optional) Name of this query
  74          *       }
  75          *    }
  76          * }
  77          *
  78          * @param {Object} [savedQueries] An object with the saved queries with
  79          *  the above structure.
  80          * @fires initialize
  81          */
  82         mw.rcfilters.dm.SavedQueriesModel.prototype.initialize = function ( savedQueries ) {
  83                 var model = this,
  84                         excludedParams = this.filtersModel.getExcludedParams();
  85
  86                 savedQueries = savedQueries || {};
  87
  88                 this.clearItems();
  89                 this.default = null;
  90                 this.converted = false;
  91
  92                 if ( savedQueries.version !== '2' ) {
  93                         // Old version dealt with filter names. We need to migrate to the new structure
  94                         // The new structure:
  95                         // {
  96                         //   version: (string) '2',
  97                         //   default: (string) Query ID,
  98                         //   queries: {
  99                         //     query_id: {
 100                         //       label: (string) Name of the query
 101                         //       data: {
 102                         //         params: (object) Representing all the parameter states
 103                         //         highlights: (object) Representing all the filter highlight states
 104                         //     }
 105                         //   }
 106                         // }
 107                         $.each( savedQueries.queries || {}, function ( id, obj ) {
 108                                 if ( obj.data && obj.data.filters ) {
 109                                         obj.data = model.convertToParameters( obj.data );
 110                                 }
 111                         } );
 112
 113                         this.converted = true;
 114                         savedQueries.version = '2';
 115                 }
 116
 117                 // Initialize the query items
 118                 $.each( savedQueries.queries || {}, function ( id, obj ) {
 119                         var normalizedData = obj.data,
 120                                 isDefault = String( savedQueries.default ) === String( id );
 121
 122                         if ( normalizedData && normalizedData.params ) {
 123                                 // Backwards-compat fix: Remove excluded parameters from
 124                                 // the given data, if they exist
 125                                 excludedParams.forEach( function ( name ) {
 126                                         delete normalizedData.params[ name ];
 127                                 } );
 128
 129                                 id = String( id );
 130                                 model.addNewQuery( obj.label, normalizedData, isDefault, id );
 131
 132                                 if ( isDefault ) {
 133                                         model.default = id;
 134                                 }
 135                         }
 136                 } );
 137
 138                 this.emit( 'initialize' );
 139         };
 140
 141         /**
 142          * Convert from representation of filters to representation of parameters
 143          *
 144          * @param {Object} data Query data
 145          * @return {Object} New converted query data
 146          */
 147         mw.rcfilters.dm.SavedQueriesModel.prototype.convertToParameters = function ( data ) {
 148                 var newData = {},
 149                         defaultFilters = this.filtersModel.getFiltersFromParameters( this.filtersModel.getDefaultParams() ),
 150                         fullFilterRepresentation = $.extend( true, {}, defaultFilters, data.filters ),
 151                         highlightEnabled = data.highlights.highlight;
 152
 153                 delete data.highlights.highlight;
 154
 155                 // Filters
 156                 newData.params = this.filtersModel.getParametersFromFilters( fullFilterRepresentation );
 157
 158                 // Highlights (taking out 'highlight' itself, appending _color to keys)
 159                 newData.highlights = {};
 160                 Object.keys( data.highlights ).forEach( function ( highlightedFilterName ) {
 161                         newData.highlights[ highlightedFilterName + '_color' ] = data.highlights[ highlightedFilterName ];
 162                 } );
 163
 164                 // Add highlight
 165                 newData.params.highlight = String( Number( highlightEnabled || 0 ) );
 166
 167                 return newData;
 168         };
 169
 170         /**
 171          * Get an object representing the base state of parameters
 172          * and highlights.
 173          *
 174          * This is meant to make sure that the saved queries that are
 175          * in memory are always the same structure as what we would get
 176          * by calling the current model's "getSelectedState" and by checking
 177          * highlight items.
 178          *
 179          * In cases where a user saved a query when the system had a certain
 180          * set of params, and then a filter was added to the system, we want
 181          * to make sure that the stored queries can still be comparable to
 182          * the current state, which means that we need the base state for
 183          * two operations:
 184          *
 185          * - Saved queries are stored in "minimal" view (only changed params
 186          *   are stored); When we initialize the system, we merge each minimal
 187          *   query with the base state (using 'getMinimalParamList') so all
 188          *   saved queries have the exact same structure as what we would get
 189          *   by checking the getSelectedState of the filter.
 190          * - When we save the queries, we minimize the object to only represent
 191          *   whatever has actually changed, rather than store the entire
 192          *   object. To check what actually is different so we can store it,
 193          *   we need to obtain a base state to compare against, this is
 194          *   what #getMinimalParamList does
 195          *
 196          * @return {Object} Base parameter state
 197          */
 198         mw.rcfilters.dm.SavedQueriesModel.prototype.getBaseParamState = function () {
 199                 var allParams,
 200                         highlightedItems = {};
 201
 202                 if ( !this.baseParamState ) {
 203                         allParams = this.filtersModel.getParametersFromFilters( {} );
 204
 205                         // Prepare highlights
 206                         this.filtersModel.getItemsSupportingHighlights().forEach( function ( item ) {
 207                                 highlightedItems[ item.getName() + '_color' ] = null;
 208                         } );
 209
 210                         this.baseParamState = {
 211                                 params: $.extend( true, { highlight: '0' }, allParams ),
 212                                 highlights: highlightedItems
 213                         };
 214                 }
 215
 216                 return this.baseParamState;
 217         };
 218
 219         /**
 220          * Get an object that holds only the parameters and highlights that have
 221          * values different than the base value.
 222          *
 223          * This is the reverse of the normalization we do initially on loading and
 224          * initializing the saved queries model.
 225          *
 226          * @param {Object} valuesObject Object representing the state of both
 227          *  filters and highlights in its normalized version, to be minimized.
 228          * @return {Object} Minimal filters and highlights list
 229          */
 230         mw.rcfilters.dm.SavedQueriesModel.prototype.getMinimalParamList = function ( valuesObject ) {
 231                 var result = { params: {}, highlights: {} },
 232                         baseState = this.getBaseParamState();
 233
 234                 // XOR results
 235                 $.each( valuesObject.params, function ( name, value ) {
 236                         if ( baseState.params !== undefined && baseState.params[ name ] !== value ) {
 237                                 result.params[ name ] = value;
 238                         }
 239                 } );
 240
 241                 $.each( valuesObject.highlights, function ( name, value ) {
 242                         if ( baseState.highlights !== undefined && baseState.highlights[ name ] !== value ) {
 243                                 result.highlights[ name ] = value;
 244                         }
 245                 } );
 246
 247                 return result;
 248         };
 249
 250         /**
 251          * Add a query item
 252          *
 253          * @param {string} label Label for the new query
 254          * @param {Object} data Data for the new query
 255          * @param {boolean} isDefault Item is default
 256          * @param {string} [id] Query ID, if exists. If this isn't given, a random
 257          *  new ID will be created.
 258          * @return {string} ID of the newly added query
 259          */
 260         mw.rcfilters.dm.SavedQueriesModel.prototype.addNewQuery = function ( label, data, isDefault, id ) {
 261                 var randomID = String( id || ( new Date() ).getTime() ),
 262                         normalizedData = this.getMinimalParamList( data );
 263
 264                 // Add item
 265                 this.addItems( [
 266                         new mw.rcfilters.dm.SavedQueryItemModel(
 267                                 randomID,
 268                                 label,
 269                                 normalizedData,
 270                                 { 'default': isDefault }
 271                         )
 272                 ] );
 273
 274                 if ( isDefault ) {
 275                         this.setDefault( randomID );
 276                 }
 277
 278                 return randomID;
 279         };
 280
 281         /**
 282          * Remove query from model
 283          *
 284          * @param {string} queryID Query ID
 285          */
 286         mw.rcfilters.dm.SavedQueriesModel.prototype.removeQuery = function ( queryID ) {
 287                 var query = this.getItemByID( queryID );
 288
 289                 if ( query ) {
 290                         // Check if this item was the default
 291                         if ( String( this.getDefault() ) === String( queryID ) ) {
 292                                 // Nulify the default
 293                                 this.setDefault( null );
 294                         }
 295
 296                         this.removeItems( [ query ] );
 297                 }
 298         };
 299
 300         /**
 301          * Get an item that matches the requested query
 302          *
 303          * @param {Object} fullQueryComparison Object representing all filters and highlights to compare
 304          * @return {mw.rcfilters.dm.SavedQueryItemModel} Matching item model
 305          */
 306         mw.rcfilters.dm.SavedQueriesModel.prototype.findMatchingQuery = function ( fullQueryComparison ) {
 307                 // Minimize before comparison
 308                 fullQueryComparison = this.getMinimalParamList( fullQueryComparison );
 309
 310                 return this.getItems().filter( function ( item ) {
 311                         return OO.compare(
 312                                 item.getData(),
 313                                 fullQueryComparison
 314                         );
 315                 } )[ 0 ];
 316         };
 317
 318         /**
 319          * Get query by its identifier
 320          *
 321          * @param {string} queryID Query identifier
 322          * @return {mw.rcfilters.dm.SavedQueryItemModel|undefined} Item matching
 323          *  the search. Undefined if not found.
 324          */
 325         mw.rcfilters.dm.SavedQueriesModel.prototype.getItemByID = function ( queryID ) {
 326                 return this.getItems().filter( function ( item ) {
 327                         return item.getID() === queryID;
 328                 } )[ 0 ];
 329         };
 330
 331         /**
 332          * Get an item's full data
 333          *
 334          * @param {string} queryID Query identifier
 335          * @return {Object} Item's full data
 336          */
 337         mw.rcfilters.dm.SavedQueriesModel.prototype.getItemFullData = function ( queryID ) {
 338                 var item = this.getItemByID( queryID );
 339
 340                 // Fill in the base params
 341                 return item ? $.extend( true, {}, this.getBaseParamState(), item.getData() ) : {};
 342         };
 343
 344         /**
 345          * Get the object representing the state of the entire model and items
 346          *
 347          * @return {Object} Object representing the state of the model and items
 348          */
 349         mw.rcfilters.dm.SavedQueriesModel.prototype.getState = function () {
 350                 var model = this,
 351                         obj = { queries: {}, version: '2' };
 352
 353                 // Translate the items to the saved object
 354                 this.getItems().forEach( function ( item ) {
 355                         var itemState = item.getState();
 356
 357                         itemState.data = model.getMinimalParamList( itemState.data );
 358
 359                         obj.queries[ item.getID() ] = itemState;
 360                 } );
 361
 362                 if ( this.getDefault() ) {
 363                         obj.default = this.getDefault();
 364                 }
 365
 366                 return obj;
 367         };
 368
 369         /**
 370          * Set a default query. Null to unset default.
 371          *
 372          * @param {string} itemID Query identifier
 373          * @fires default
 374          */
 375         mw.rcfilters.dm.SavedQueriesModel.prototype.setDefault = function ( itemID ) {
 376                 if ( this.default !== itemID ) {
 377                         this.default = itemID;
 378
 379                         // Set for individual itens
 380                         this.getItems().forEach( function ( item ) {
 381                                 item.toggleDefault( item.getID() === itemID );
 382                         } );
 383
 384                         this.emit( 'default', itemID );
 385                 }
 386         };
 387
 388         /**
 389          * Get the default query ID
 390          *
 391          * @return {string} Default query identifier
 392          */
 393         mw.rcfilters.dm.SavedQueriesModel.prototype.getDefault = function () {
 394                 return this.default;
 395         };
 396
 397         /**
 398          * Check if the saved queries were converted
 399          *
 400          * @return {boolean} Saved queries were converted from the previous
 401          *  version to the new version
 402          */
 403         mw.rcfilters.dm.SavedQueriesModel.prototype.isConverted = function () {
 404                 return this.converted;
 405         };
 406 }( mediaWiki, jQuery ) );