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/*!
 * TranslationStash front-end logic.
 *
 * @author Santhosh Thottingal
 * @license GPL-2.0-or-later
 * @since 2013.10
 */
'use strict';

var userTranslations = {},
	TranslationStashStorage = require( './storage.js' ),
	translationStorage = new TranslationStashStorage();

mw.translate.canTranslate = function () {
	// At this page, the new translator can translate
	return true;
};

function getMessages( messageGroup, language, offset, limit ) {
	var deferred = new mw.Api().get( {
		action: 'query',
		list: 'messagecollection',
		mcgroup: messageGroup,
		mclanguage: language,
		mcoffset: offset,
		mclimit: limit,
		mcprop: 'definition'
	} );

	return deferred.promise();
}

function addMessage( message ) {
	var $messageTable = $( '.tux-messagelist' ),
		sourceLanguage = $messageTable.data( 'sourcelangcode' ),
		sourceLanguageDir = $.uls.data.getDir( sourceLanguage ),
		targetLanguage = $messageTable.data( 'targetlangcode' ),
		targetLanguageDir = $.uls.data.getDir( targetLanguage ),
		status = message.properties.status,
		statusClass = 'tux-status-' + status;

	var statusMsg;
	if ( status === 'translated' ) {
		// tux-status-translated
		statusMsg = 'tux-status-' + status;
	}

	var $messageWrapper = $( '<div>' )
		.addClass( 'row tux-message' );

	var $message = $( '<div>' )
		.addClass( 'row message tux-message-item ' + status )
		.append(
			$( '<div>' )
				.addClass( 'eight columns tux-list-message' )
				.append(
					$( '<span>' )
						.addClass( 'tux-list-source' )
						.attr( {
							lang: sourceLanguage,
							dir: sourceLanguageDir
						} )
						.text( message.definition ),
					// Bidirectional isolation.
					// This should be removed some day when proper
					// unicode-bidi: isolate
					// is supported everywhere
					$( '<span>' )
						.html( $( document.body ).hasClass( 'rtl' ) ? '&rlm;' : '&lrm;' ),
					$( '<span>' )
						.addClass( 'tux-list-translation' )
						.attr( {
							lang: targetLanguage,
							dir: targetLanguageDir
						} )
						.text( message.translation || '' )
				),
			$( '<div>' )
				.addClass( 'two columns tux-list-status text-center' )
				.append(
					$( '<span>' )
						.addClass( statusClass )
						// The following messages are used here:
						// * tux-status-optional
						// * tux-status-fuzzy
						// * tux-status-proofread
						// * tux-status-translated
						// * tux-status-saving
						// * tux-status-unsaved
						.text( statusMsg ? mw.msg( statusMsg ) : '' )
				),
			$( '<div>' )
				.addClass( 'two column tux-list-edit text-right' )
				.append(
					$( '<a>' )
						.attr( {
							title: mw.msg( 'translate-edit-title', message.key )
						} )
						.text( mw.msg( 'tux-edit' ) )
				)
		);

	$messageWrapper.append( $message );
	$messageTable.append( $messageWrapper );
	// Attach translate editor to the message
	$messageWrapper.translateeditor( {
		message: message,
		storage: translationStorage,
		onSave: updateStats,
		onSkip: function () {
			var $next = this.$editTrigger.next( '.tux-message' );

			// If there is text in the skipped message, avoid showing the
			// regular "you have unsaved messages" when navigating away,
			// because there is no way to get back to these messages.
			this.markUnunsaved();

			// This can happen when it's
			// the last message in the translation stash
			if ( !$next.length ) {
				// Reload the page to get more messages
				// when we get to the last one
				window.location.reload();
			}
		},
		onReady: function () {
			this.$editor.find( '.tux-editor-skip-button' )
				.text( mw.msg( 'translate-translationstash-skip-button-label' ) );
		}
	} );
}

/**
 * Updates the translation count at the top of the message list and
 * displays warning when translation limit has been reached.
 * Relies on classes stash-stats and tux-status-translated.
 */
function updateStats() {
	var $target = $( '.stash-stats' );

	var count = $( '.tux-status-translated' ).length;
	if ( count === 0 ) {
		return;
	}

	$target.text( mw.msg(
		'translate-translationstash-translations',
		mw.language.convertNumber( count )
	) );

	if ( count >= mw.config.get( 'wgTranslateSandboxLimit' ) ) {
		// Remove the untranslated message to disallow translation beyond the limit
		$( '.tux-message' ).has( '.untranslated' ).remove();

		// Show a message telling that the limit was reached
		$( '.limit-reached' )
			.empty()
			.append( $( '<h1>' ).text( mw.msg( 'tsb-limit-reached-title' ) ) )
			.append( $( '<p>' ).text( mw.msg( 'tsb-limit-reached-body' ) ) )
			.removeClass( 'hide' );
	}
}

function loadMessages() {
	var $messageTable = $( '.tux-messagelist' ),
		messagegroup = '!sandbox';

	$( '<div>' )
		.addClass( 'tux-loading-indicator' )
		.appendTo( $messageTable );

	getMessages( messagegroup, $messageTable.data( 'targetlangcode' ) )
		.done( function ( result ) {
			var messages = result.query.messagecollection;

			$messageTable.empty();
			messages.forEach( function ( message ) {
				message.properties = {};
				message.properties.status = 'untranslated';

				message.group = messagegroup;
				if ( userTranslations[ message.title ] ) {
					message.translation = userTranslations[ message.title ].translation;
					message.properties.status = 'translated';
				}

				addMessage( message );
			} );

			// Show the editor for the first untranslated message.
			var $untranslated = $( '.tux-message' )
				.has( '.tux-message-item.untranslated' )
				.first();
			if ( $untranslated.length ) {
				$untranslated.data( 'translateeditor' ).show();
			}

			updateStats();
		} ).fail( function ( errorCode, response ) {
			$messageTable.empty().addClass( 'error' )
				.text( 'Error: ' + errorCode + ' - ' +
					( response.error && response.error.info || 'Unknown error' )
				);
		} );
}

$( function () {
	var $messageTable = $( '.tux-messagelist' ),
		$ulsTrigger = $( '.ext-translate-language-selector > .uls' );

	// Some links in helpers will navigate away by default. But since the messages
	// will change on this page on every load, we want to avoid that. Force the
	// links to open on new window/tab.
	mw.hook( 'mw.translate.editor.showTranslationHelpers' ).add( function ( helpers, $editor ) {
		$editor.find( 'a' ).prop( 'target', '_blank' );
	} );

	$ulsTrigger.uls( {
		ulsPurpose: 'translate-special-translationstash',
		onSelect: function ( language ) {
			var direction = $.uls.data.getDir( language ),
				autonym = $.uls.data.getAutonym( language );

			$ulsTrigger
				.text( autonym )
				.attr( {
					lang: language,
					dir: direction
				} );

			$messageTable
				.empty()
				.data( {
					targetlangcode: language,
					targetlangdir: direction
				} );

			loadMessages();
		}
	} );
	// Get the user translations if any(possibly from an early attempt)
	// and new messages to try.
	translationStorage.getUserTranslations()
		.done( function ( translations ) {
			if ( translations.translationstash.translations ) {
				translations.translationstash.translations.forEach( function ( translation ) {
					userTranslations[ translation.title ] = translation;
				} );
			}
			loadMessages();
		} );
} );