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/*!
 * Translate language statistics bar - jQuery plugin.
 *
 * @author Niklas Laxström
 * @author Santhosh Thottingal
 * @license GPL-2.0-or-later
 * @since 2012-11-30
 */

/*
 * Usage:
 *	$( '<div>' ).languagestatsbar( {
 *		language: 'fi',
 *		group: 'core'
 *	} );
 * The status bar will be rendered to the newly created div. Or use any container.
 */
( function ( mw, $ ) {
	'use strict';

	var LanguageStatsBar = function ( container, options ) {
		this.$container = $( container );
		this.group = options.group;
		this.language = options.language;
		this.$statsBar = null;
		this.elements = null;
		this.init();
	};

	LanguageStatsBar.prototype = {
		init: function () {
			if ( mw.translate.languagestats[ this.language ] ) {
				this.render();
			} else {
				mw.translate.loadLanguageStats( this.language )
					.done( this.render.bind( this ) );
			}
		},

		/**
		 * Listen for the change events and update the statsbar
		 */
		listen: function () {
			var i,
				statsbar = this,
				languageStats = mw.translate.languagestats[ this.language ];

			statsbar.$statsBar.on( 'change', function ( event, to, from ) {
				for ( i = 0; i < languageStats.length; i++ ) {
					if ( languageStats[ i ].group === statsbar.group ) {
						// Changing a proofread message does not create a new translation
						if ( to === 'translated' && from !== 'proofread' ) {
							languageStats[ i ].translated++;
						}
						if ( to === 'proofread' ) {
							languageStats[ i ].proofread++;
						}
						if ( to === 'fuzzy' ) {
							languageStats[ i ].fuzzy++;
						}

						if ( from === 'fuzzy' ) {
							languageStats[ i ].fuzzy--;
						}
						if ( from === 'proofread' ) {
							languageStats[ i ].proofread--;
						}
						// Proofreading a message does not remove translation
						if ( from === 'translated' && to !== 'proofread' ) {
							languageStats[ i ].translated--;
						}
						break;
					}
				}

				// Update the stats bar
				statsbar.update();
			} );

			statsbar.$container.on( {
				mouseenter: function () {
					statsbar.elements.$info.removeClass( 'hide' );
				},
				mouseleave: function () {
					statsbar.elements.$info.addClass( 'hide' );
				}
			} );
		},

		render: function () {
			this.$statsBar = $( '<div>' )
				.addClass( 'tux-statsbar' )
				.data( 'group', this.group );

			this.elements = {
				$proofread: $( '<span>' ).addClass( 'tux-proofread' ),
				$translated: $( '<span>' ).addClass( 'tux-translated' ),
				$fuzzy: $( '<span>' ).addClass( 'tux-fuzzy' ),
				$untranslated: $( '<span>' ).addClass( 'tux-untranslated' ),
				$info: $( '<div>' ).addClass( 'tux-statsbar-info hide' )
			};

			this.update();
			this.$statsBar.append( [
				// Append needs an array instead of an object
				this.elements.$proofread,
				this.elements.$translated,
				this.elements.$fuzzy,
				this.elements.$untranslated,
				this.elements.$info
			] );
			this.$container.append( this.$statsBar );

			this.listen();
		},

		update: function () {
			var proofread, translated, fuzzy, untranslated,
				stats = this.getStatsForGroup( this.group );

			proofread = 100 * stats.proofread / stats.total;
			// Proofread messages are also translated, so remove those for
			// the bar showing only translated count.
			translated = stats.translated - stats.proofread;
			translated = 100 * translated / stats.total;
			fuzzy = 100 * stats.fuzzy / stats.total;
			untranslated = 100 - proofread - translated - fuzzy;

			this.elements.$proofread[ 0 ].style.width = proofread + '%';
			this.elements.$translated[ 0 ].style.width = translated + '%';
			this.elements.$fuzzy[ 0 ].style.width = fuzzy + '%';
			this.elements.$untranslated[ 0 ].style.width = untranslated + '%';

			translated = !translated ? 0 : translated + proofread;
			proofread = !proofread ? 0 : proofread;

			if ( fuzzy ) {
				this.elements.$info
					.text( mw.msg( 'translate-statsbar-tooltip-with-fuzzy',
						translated.toFixed(), proofread.toFixed(),
						fuzzy.toFixed() ) );
			} else {
				this.elements.$info
					.text( mw.msg( 'translate-statsbar-tooltip',
						translated.toFixed(), proofread.toFixed() ) );
			}
		},

		getStatsForGroup: function ( group ) {
			var i,
				languageStats = mw.translate.languagestats[ this.language ];

			for ( i = 0; i < languageStats.length; i++ ) {
				if ( languageStats[ i ].group === group ) {
					return languageStats[ i ];
				}
			}

			return {
				proofread: 0,
				total: 0,
				fuzzy: 0,
				translated: 0
			};
		}
	};

	/*
	 * languagestatsbar PLUGIN DEFINITION
	 */

	$.fn.languagestatsbar = function ( options ) {
		return this.each( function () {
			var $this = $( this ),
				data = $this.data( 'languagestatsbar' );

			if ( !data ) {
				$this.data( 'languagestatsbar', ( data = new LanguageStatsBar( this, options ) ) );
			}
		} );
	};

	$.fn.languagestatsbar.Constructor = LanguageStatsBar;

	mw.translate = mw.translate || {};

}( mediaWiki, jQuery ) );

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