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

		/**
		 * Load thanked IDs from cookies
		 *
		 * @param {string} [cookieName] Cookie name to use, defaults to this.cookieName
		 * @return {string[]} Thanks IDs
		 */
		load: function ( cookieName ) {
			const cookie = mw.cookie.get( cookieName || this.cookieName );
			if ( cookie === null ) {
				return [];
			}
			return unescape( cookie ).split( ',' );
		},

		/**
		 * Record as ID as having been thanked
		 *
		 * @param {string} id Thanked ID
		 * @param {string} [cookieName] Cookie name to use, defaults to this.cookieName
		 */
		push: function ( id, cookieName ) {
			let saved = this.load();
			saved.push( id );
			if ( saved.length > this.maxHistory ) { // prevent forever growing
				saved = saved.slice( saved.length - this.maxHistory );
			}
			mw.cookie.set( cookieName || this.cookieName, escape( saved.join( ',' ) ) );
		},

		/**
		 * Check if an ID has already been thanked, according to the cookie
		 *
		 * @param {string} id Thanks ID
		 * @param {string} [cookieName] Cookie name to use, defaults to this.cookieName
		 * @return {boolean} ID has been thanked
		 */
		contains: function ( id, cookieName ) {
			return this.load( cookieName ).includes( id );
		}
	},

	/**
	 * Retrieve user gender
	 *
	 * @param {string} username Requested username
	 * @return {jQuery.Promise} A promise that resolves with the gender string, 'female', 'male', or 'unknown'
	 */
	getUserGender: function ( username ) {
		return new mw.Api().get( {
			action: 'query',
			list: 'users',
			ususers: username,
			usprop: 'gender'
		} )
			.then(
				( result ) => (
					result.query.users[ 0 ] &&
						result.query.users[ 0 ].gender
				) || 'unknown',
				() => 'unknown'
			);
	}
};
