/*
 * This file is part of the MediaWiki extension MediaViewer.
 *
 * MediaViewer 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.
 *
 * MediaViewer 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 MediaViewer.  If not, see <http://www.gnu.org/licenses/>.
 */

( function( mw, $, oo ) {
	var SBP;

	/**
	 * @class mw.mmv.ui.StripeButtons
	 * @extends mw.mmv.ui.Element
	 * Class for buttons which are placed on the metadata stripe (the always visible part of the
	 * metadata panel).
	 * @constructor
	 * @param {jQuery} $container
	 * @param {Object} localStorage the localStorage object, for dependency injection
	 */
	function StripeButtons( $container, localStorage ) {
		mw.mmv.ui.Element.call( this, $container );

		/** @property {Object} localStorage the window.localStorage object */
		this.localStorage = localStorage;

		this.$buttonContainer = $( '<div>' )
			.addClass( 'mw-mmv-stripe-button-container' )
			.appendTo( $container );

		/**
		 * This holds the actual buttons.
		 * @property {Object.<string, jQuery>}
		 */
		this.buttons = {};

		if ( this.shouldShowFeedbackSurvey() ) {
			this.initFeedbackButton();
		}
		this.initReuseButton();
		if ( !mw.user.isAnon() ) {
			this.initDescriptionPageButton();
		}
	}
	oo.inheritClass( StripeButtons, mw.mmv.ui.Element );
	SBP = StripeButtons.prototype;

	/**
	 * @protected
	 * Creates a new button on the metadata stripe.
	 * @param {string} cssClass CSS class name for the button
	 * @param {string} text HTML code for the button text
	 * @param {string} popupText HTML code for the popup text
	 */
	SBP.createButton = function ( cssClass, text, popupText ) {
		return $( '<a>' )
			.addClass( 'mw-mmv-stripe-button empty ' + cssClass )
			// .text( text ) // disabled while we have 3 buttons to save space
			.prop( 'title', popupText )
			// elements are right-floated so we use prepend instead of append to keep the order
			.prependTo( this.$buttonContainer )
			.tipsy( { gravity: 's' } );
	};

	/**
	 * @protected
	 * Creates the reuse button.
	 */
	SBP.initReuseButton = function() {
		this.buttons.$reuse = this.createButton(
			'mw-mmv-stripe-button-reuse',
			mw.message( 'multimediaviewer-reuse-link' ).text(),
			mw.message( 'multimediaviewer-reuse-link' ).text()
		);
	};

	/**
	 * @protected
	 * Creates a button linking to the file description page.
	 */
	SBP.initDescriptionPageButton = function() {
		this.buttons.$descriptionPage = this.createButton(
			'mw-mmv-stripe-button-commons',
			mw.message( 'multimediaviewer-description-page-button-text' ).plain()
		);
	};

	/**
	 * @protected
	 * Creates the feedback button.
	 */
	SBP.initFeedbackButton = function() {
		var buttons = this;

		this.buttons.$feedback = this.createButton(
			'mw-mmv-stripe-button-feedback',
			mw.message( 'multimediaviewer-feedback-button-text' ).plain(),
			mw.message( 'multimediaviewer-feedback-popup-text' ).plain()
		).attr( {
			target: '_blank',
			href: this.getFeedbackSurveyUrl()
		} ).click( function ( e ) {
			buttons.openSurveyInNewWindow();
			buttons.maxOutTooltipDisplayCount();
			e.preventDefault();
		} );
	};

	SBP.feedbackSettings = {
		/** Show the tooltip this many seconds to get the user's attention, even when it is not hovered. */
		tooltipDisplayDuration: 5,
		/** Wait for this long after the viewer is opened, before showing the tooltip. */
		tooltipDelay: 5,
		/** Only show the tooltip this many times */
		tooltipMaxDisplayCount: 3
	};

	/**
	 * Returns the number of times the tooltip was shown so far. This number is set to 999 if the
	 * user clicked on the link already, or we cannot count how many times the tooltip was shown
	 * already.
	 * @return {number}
	 */
	SBP.getTooltipDisplayCount = function () {
		if ( !this.localStorage ) {
			return 999;
		}
		if ( this.tooltipDisplayCount === undefined ) {
			this.tooltipDisplayCount = this.localStorage.getItem( 'mmv.tooltipDisplayCount' );
			if ( this.tooltipDisplayCount === null ) {
				this.tooltipDisplayCount = 0;
				this.localStorage.setItem( 'mmv.tooltipDisplayCount', 0 );
			}
		}
		return this.tooltipDisplayCount;
	};

	/**
	 * Increases tooltip display count.
	 */
	SBP.increaseTooltipDisplayCount = function () {
		this.getTooltipDisplayCount();
		if ( this.tooltipDisplayCount !== undefined ) {
			this.tooltipDisplayCount++;
			this.localStorage.setItem( 'mmv.tooltipDisplayCount', this.tooltipDisplayCount );
		}
	};

	/**
	 * Sets tooltip display count so large that the tooltip will never be shown again.
	 * We use this for users who already opened the form.
	 */
	SBP.maxOutTooltipDisplayCount = function () {
		this.getTooltipDisplayCount();
		if ( this.tooltipDisplayCount !== undefined ) {
			this.tooltipDisplayCount = 999;
			this.localStorage.setItem( 'mmv.tooltipDisplayCount', this.tooltipDisplayCount );
		}
	};

	/**
	 * Show the tooltip to the user if it was not shown often enough yet.
	 */
	SBP.maybeDisplayTooltip = function () {
		if (
			this.readyToShowFeedbackTooltip &&
			this.getTooltipDisplayCount() < this.feedbackSettings.tooltipMaxDisplayCount
		) {
			this.buttons.$feedback.tipsy( 'show' );
			this.setTimer( 'feedbackTooltip.hide', function () {
				this.buttons.$feedback.tipsy( 'hide' );
			}, this.feedbackSettings.tooltipDisplayDuration * 1000 );
			this.increaseTooltipDisplayCount();
			this.readyToShowFeedbackTooltip = false;
		} else {
			// if the tooltip is visible already, make sure it is not hidden too quickly
			this.resetTimer( 'feedbackTooltip.hide' );
		}
	};

	/**
	 * Returns a link to a survey in the given language or null if that language is not supported
	 * @param {string|null} langcode
	 */
	SBP.getFeedbackSurveyBaseUrlForLanguage = function ( langcode ) {
		var baseLangcode,
			baseUrl = 'https://www.surveymonkey.com/s/media-viewer-1',
			surveyTranslations = { ca: 'ca', hu: 'hu', fr: 'fr', pt: 'pt-br', 'pt-br': 'pt-br',
				de: 'de', es: 'es', nl: 'nl' };

		baseLangcode = langcode.split( /[_-]/ )[0]; // get rid of variants
		if ( baseLangcode === 'en') {
			return baseUrl;
		} else if ( surveyTranslations[langcode] ) {
			return baseUrl + '-' + surveyTranslations[langcode];
		} else if ( surveyTranslations[baseLangcode] ) {
			return baseUrl + '-' + surveyTranslations[baseLangcode];
		} else {
			return null;
		}
	};

	/**
	 * Returns a link to a survey in the user language, or null if not supported
	 */
	SBP.getFeedbackSurveyBaseUrl = function () {
		return this.getFeedbackSurveyBaseUrlForLanguage( mw.config.get( 'wgUserLanguage' ) );
	};

	/**
	 * Checks if it is suitable to show a survey to the current user.
	 */
	SBP.shouldShowFeedbackSurvey = function () {
		return mw.config.get( 'wgMultimediaViewer' ).showSurvey &&
			this.getFeedbackSurveyBaseUrl();
	};

	/**
	 * Generates a survey URL (currently constant but the possibility of splitting by
	 * editor cohort was mentioned).
	 * @return {string}
	 */
	SBP.getFeedbackSurveyUrl = function () {
		return this.getFeedbackSurveyBaseUrl() + '?c=' + mw.config.get( 'wgDBname' );
	};

	/**
	 * Opens the survey in a new window, or brings it up if it is already opened.
	 */
	SBP.openSurveyInNewWindow = function () {
		var surveyWindowWidth = screen.width * 0.85,
			surveyWindowHeight = screen.height * 0.85,
			feedbackSurveyWindowProperties = {
				left: ( screen.width - surveyWindowWidth ) / 2,
				top: ( screen.height - surveyWindowHeight ) / 2,
				width: surveyWindowWidth,
				height: surveyWindowHeight,
				menubar: 0,
				toolbar: 0,
				location: 0,
				personalbar: 0,
				status: 0,
				scrollbars: 1
			};

		if ( !this.surveyWindow || this.surveyWindow.closed ) {
			this.surveyWindow = window.open( this.getFeedbackSurveyUrl(), 'mmv-survey',
				this.createWindowOpenPropertyString( feedbackSurveyWindowProperties ) );
		} else {
			this.surveyWindow.focus();
		}
	};

	/**
	 * @protected
	 * Takes a property object and turns it into a string suitable for the last parameter
	 * of window.open.
	 * @param {Object} properties
	 * @return {string}
	 */
	SBP.createWindowOpenPropertyString = function ( properties ) {
		var propertyArray = [];
		$.each( properties, function ( key, value ) {
			propertyArray.push( key + '=' + value );
		} );
		return propertyArray.join( ',' );
	};

	/**
	 * @protected
	 * Runs code for each button, similarly to $.each.
	 * @param {function(jQuery, string)} callback a function that will be called with each button
	 */
	SBP.eachButton = function ( callback )  {
		var buttonName;
		for ( buttonName in this.buttons ) {
			callback( this.buttons[buttonName], buttonName );
		}
	};

	/**
	 * @inheritdoc
	 * @param {mw.mmv.model.Image} imageInfo
	 * @param {mw.mmv.model.Repo} repoInfo
	 */
	SBP.set = function ( imageInfo, repoInfo ) {
		this.eachButton( function ( $button ) {
			$button.removeClass( 'empty' );
		} );

		if ( !mw.user.isAnon() ) {
			this.setDescriptionPageButton( imageInfo, repoInfo );
		}

		if ( this.shouldShowFeedbackSurvey() ) {
			this.maybeDisplayTooltip();
		}
	};

	/**
	 * @protected
	 * Updates the button linking to the file page.
	 * @param {mw.mmv.model.Image} imageInfo
	 * @param {mw.mmv.model.Repo} repoInfo
	 */
	SBP.setDescriptionPageButton = function ( imageInfo, repoInfo ) {
		var descPagePopupMessage;

		descPagePopupMessage = repoInfo.isLocal
			? mw.message( 'multimediaviewer-description-page-button-text' ).plain()
			: mw.message( 'multimediaviewer-description-page-popup-text', repoInfo.displayName ).plain();

		this.buttons.$descriptionPage.attr( {
			href: imageInfo.descriptionUrl,
			title: descPagePopupMessage,
			'original-title': descPagePopupMessage // needed by jquery.tipsy
		} );

		if ( imageInfo.repo === 'wikimediacommons' ) {
			this.buttons.$descriptionPage.addClass( 'mw-mmv-stripe-button-commons' );
		} else {
			this.buttons.$descriptionPage.addClass( 'mw-mmv-stripe-button-dynamic' );
			if ( repoInfo.favIcon ) {
				this.setInlineStyle( 'stripe-button-description-page',
					// needs to be more specific then the fallback rule in stripeButtons.less
					'.mw-mmv-stripe-button-container .mw-mmv-stripe-button-dynamic:before {' +
						'background-image: url("' + repoInfo.favIcon + '");' +
					'}'
				);
			}
		}
	};

	/**
	 * @inheritdoc
	 */
	SBP.empty = function () {
		this.eachButton( function ( $button ) {
			$button.addClass( 'empty' );
		} );

		this.buttons.$reuse.removeClass( 'open' );
		if ( !mw.user.isAnon() ) {
			this.buttons.$descriptionPage.attr( { href: null, title: null, 'original-title': null } )
				.removeClass( 'mw-mmv-stripe-button-dynamic mw-mmv-stripe-button-commons' );
			$( '.mw-mmv-stripe-button-dynamic-before' ).remove();
			this.setInlineStyle( 'stripe-button-description-page', null );
		}
	};

	/**
	 * @event mmv-reuse-open
	 * Fired when the buttonto open the reuse dialog is clicked.
	 */
	/**
	 * Registers listeners.
	 */
	SBP.attach = function () {
		var buttons = this.buttons;

		buttons.$reuse.on( 'click.mmv-stripeButtons', function ( e ) {
			$( document ).trigger( 'mmv-reuse-open' );
			e.stopPropagation(); // the dialog would take it as an outside click and close
		} );
		this.handleEvent( 'mmv-reuse-opened', function () {
			buttons.$reuse.addClass( 'open' );
		} );
		this.handleEvent( 'mmv-reuse-closed', function () {
			buttons.$reuse.removeClass( 'open' );
		} );

		if ( this.shouldShowFeedbackSurvey() ) {
			this.readyToShowFeedbackTooltip = false;
			this.setTimer( 'feedbackTooltip.show', function () {
				this.readyToShowFeedbackTooltip = true;
				this.maybeDisplayTooltip();
			}, this.feedbackSettings.tooltipDelay * 1000 );
		}
	};

	/**
	 * Clears listeners.
	 */
	SBP.unattach = function () {
		this.constructor['super'].prototype.unattach.call( this );
		this.buttons.$reuse.off( 'click.mmv-stripeButtons' );

		this.clearTimer( 'feedbackTooltip.show' );
	};

	mw.mmv.ui.StripeButtons = StripeButtons;
}( mediaWiki, jQuery, OO ) );