( function ( $, mw ) {
	'use strict';

	mw.thanks = {
		// Keep track of which revisions and comments the user has already thanked for
		thanked: {
			maxHistory: 100,
			cookieName: 'thanks-thanked',
			attrName: 'data-revision-id',

			load: function() {
				var cookie = $.cookie( this.cookieName );
				if ( cookie === null ) {
					return [];
				}
				return unescape( cookie ).split( ',' );
			},

			push: function( $thankLink ) {
				var saved = this.load();
				saved.push( $thankLink.attr( this.attrName ) );
				if ( saved.length > this.maxHistory ) { // prevent forever growing
					saved = saved.slice( saved.length - this.maxHistory );
				}
				$.cookie( this.cookieName, escape( saved.join( ',' ) ) );
			},

			contains: function( $thankLink ) {
				// $.inArray returns the index position or -1 if non-existant
				if ( $.inArray( $thankLink.attr( this.attrName ), this.load() ) !== -1 ) {
					return true;
				} else {
					return false;
				}
			}
		}
	};

} )( jQuery, mediaWiki );