/**
 * User script to replay conflicts.
 *
 * The conflicting edit text is stored under a special title like,
 *   Conflict:<title>/<base_revision_id>/<conflict_sequence>
 * Where the placeholders are, the page title where the conflict occurred, the base revision ID that was being edited,
 * and a 1-based sequence which is ignored for now, and lets multiple conflicts share the same base revision.
 *
 * TODO:
 *   - User input for the edit summary.
 *   - Controls to do advanced things like tweaking the branchpoint and choosing an "other" edit other than
 *     the target page's latest revision.
 *   - Proper namespace for these pages.
 */
mw.loader.using( [
	'mediawiki.api',
	'moment',
	'oojs-ui-core'
] ).done( function () {
	$( function () {
		// TODO: The regex is missing the start anchor "^" so that it can be used as a subpage in various places,
		//  until the Conflict namespace exists.
		var conflictTitleParams = /Conflict:(.*)\/(\d+)\/(\d+)$/.exec( mw.config.get('wgPageName' ) );
		if ( conflictTitleParams !== null ) {
			var baseTitle = conflictTitleParams[1],
				baseRevisionId = conflictTitleParams[2] /*,
				conflictSequence = conflictTitleParams[3] */;

			var form = new OO.ui.FormLayout( {
				// TODO: urlencode the title, or build the query using a helper.
				action: mw.config.get('wgScript' ) + '?title=' + baseTitle + '&action=submit',
				method: 'post'
			} );
			form.addItems( [
				new OO.ui.FieldsetLayout( {
					label: 'Conflict',
					items: [
						new OO.ui.ButtonWidget( {
							label: 'Recreate conflict',
							title: 'Submit',
						} ).on( 'click', function () {
							// TODO: clean up binding
							form.$element.submit();
						} )
					]
				} )
			] );

			var postFields = {
				wpUnicodeCheck: 'ℳ𝒲♥𝓊𝓃𝒾𝒸ℴ𝒹ℯ',
				editRevId: baseRevisionId,
				parentRevId: baseRevisionId,
				// TODO: stored / input / automatic summary field.
				//wpSummary: '',
				wpSave: 'Save changes',
				mode: 'text',
				wpUltimateParam: '1',
			};

			var api = new mw.Api();
			Promise.all( [
				api.getEditToken().then(
					function ( editToken ) {
						postFields.wpEditToken = editToken;
					}
				),

				// Pull content from the conflict page.
				api.get( {
					action: 'query',
					prop: 'revisions',
					revids: mw.config.get( 'wgCurRevisionId' ),
					rvprop: 'content'
				} ).then(
					function ( data ) {
						for ( var pageId in data.query.pages ) {
							for ( var index in data.query.pages[pageId].revisions ) {
								var revision = data.query.pages[pageId].revisions[index];
								postFields.wpTextbox1 = revision['*'];
								postFields.format = revision.contentformat;
								postFields.model = revision.contentmodel;
								return;
							}
						}
					}
				),

				// Get timestamp of the original base revision, to convince EditPage we need to conflict.
				// Edit time turns out to be important, conflict cannot be triggered without it!
				api.get( {
					action: 'query',
					prop: 'revisions',
					revids: baseRevisionId,
					rvprop: 'timestamp'
				} ).then(
					function ( data ) {
						for ( var pageId in data.query.pages ) {
							for ( var index in data.query.pages[pageId].revisions ) {
								var revision = data.query.pages[pageId].revisions[index];
								// FIXME: date conversion from a library
								postFields.wpEdittime = moment( revision.timestamp ).utc().format( 'YYYYMMDDHHmmss' );
								return;
							}
						}
					}
				)

			] ).then(
				function ( ) {
					var keys = Object.keys( postFields );
					for ( var i = 0; i < keys.length; i++ ) {
						form.addItems( [
							new OO.ui.HiddenInputWidget( {
								name: keys[i],
								value: postFields[keys[i]],
							} )
						] );
					}

					$( '#bodyContent' ).prepend( form.$element );
				}
			);
		}
	});
});