/*
 * This file is part of the MediaWiki extension MultimediaViewer.
 *
 * MultimediaViewer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * MultimediaViewer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with MultimediaViewer.  If not, see <http://www.gnu.org/licenses/>.
 */

const Api = require( './mmv.provider.Api.js' );
const ImageModel = require( '../model/mmv.model.Image.js' );

( function () {

	/**
	 * Gets file information.
	 *
	 * See https://www.mediawiki.org/wiki/API:Properties#imageinfo_.2F_ii
	 */
	class ImageInfo extends Api {
		/**
		 * @param {mw.Api} api
		 * @param {Object} [options]
		 * @cfg {string} [language=null] image metadata language
		 * @cfg {number} [maxage] cache expiration time, in seconds
		 *  Will be used for both client-side cache (maxage) and reverse proxies (s-maxage)
		 */
		constructor( api, options ) {
			options = Object.assign( {
				language: null
			}, options );

			super( api, options );
		}

		/**
		 * Array of imageinfo API properties which are needed to construct an Image model.
		 *
		 * @return {string[]}
		 */
		get iiprop() {
			return [
				'timestamp',
				'url',
				'size',
				'mime',
				'mediatype',
				'extmetadata'
			];
		}

		/**
		 * Array of imageinfo extmetadata fields which are needed to construct an Image model.
		 *
		 * @return {string[]}
		 */
		get iiextmetadatafilter() {
			return [
				'DateTime',
				'DateTimeOriginal',
				'ObjectName',
				'ImageDescription',
				'License',
				'LicenseShortName',
				'UsageTerms',
				'LicenseUrl',
				'Credit',
				'Artist',
				'AuthorCount',
				'GPSLatitude',
				'GPSLongitude',
				'Permission',
				'Attribution',
				'AttributionRequired',
				'NonFree',
				'Restrictions',
				'DeletionReason'
			];
		}

		/**
		 * Runs an API GET request to get the image info.
		 *
		 * @param {mw.Title} file
		 * @return {jQuery.Promise} a promise which resolves to an Image object.
		 */
		get( file ) {
			return this.getCachedPromise( file.getPrefixedDb(), () => {
				return this.apiGetWithMaxAge( {
					formatversion: 2,
					action: 'query',
					prop: 'imageinfo',
					titles: file.getPrefixedDb(),
					iiprop: this.iiprop,
					iiextmetadatafilter: this.iiextmetadatafilter,
					iiextmetadatalanguage: this.options.language,
					uselang: 'content'
				} ).then( ( data ) => {
					return this.getQueryPage( data );
				} ).then( ( page ) => {
					if ( page.imageinfo && page.imageinfo.length ) {
						return ImageModel.newFromImageInfo( file, page );
					} else if ( page.missing === true && page.imagerepository === '' ) {
						return $.Deferred().reject( `file does not exist: ${file.getPrefixedDb()}` );
					} else {
						return $.Deferred().reject( 'unknown error' );
					}
				} );
			} );
		}
	}

	module.exports = ImageInfo;
}() );