/*
 * 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/>.
 */

const HtmlUtils = require( '../mmv.HtmlUtils.js' );
const UiElement = require( './mmv.ui.js' );
const MetadataPanelScroller = require( './mmv.ui.metadataPanelScroller.js' );

/**
 * A box to display additional terms or remarks from the image author.
 * (Typically comes from the Permission field of the {{Information}} template.)
 * It has two states: when closed, it just shows some text, when open, it shows the HTML
 * block supplied by the author in its full beauty.
 */
class Permission extends UiElement {
	/**
	 * @param {jQuery} $container
	 * @param {MetadataPanelScroller} scroller
	 */
	constructor( $container, scroller ) {
		super( $container );

		/**
		 * Contains everything else.
		 *
		 * @property {jQuery}
		 */
		this.$box = $( '<div>' )
			.addClass( 'mw-mmv-permission-box mw-mmv-info-box empty' )
			.appendTo( this.$container );

		/**
		 * Box title
		 *
		 * @property {jQuery}
		 */
		this.$title = $( '<h3>' )
			.text( mw.msg( 'multimediaviewer-permission-title' ) )
			.appendTo( this.$box );

		/**
		 * Plain-text version of the author's message
		 * This is just the text parsed out from the original markup, it might not make much sense
		 * (e.g. if the original is a HTML table)
		 *
		 * @property {jQuery}
		 */
		this.$text = $( '<div>' )
			.addClass( 'mw-mmv-permission-text' )
			.appendTo( this.$box )
			.on( 'click', '.mw-mmv-permission-text-viewmore', ( e ) => {
				e.preventDefault();
				this.grow();
				this.scroller.toggle( 'up' );
			} );

		/**
		 * A helper element to fade off text
		 *
		 * @property {jQuery}
		 */
		this.$fader = $( '<div>' )
			.addClass( 'mw-mmv-permission-text-fader' )
			.append(
				$( '<a>' )
					.addClass( 'mw-mmv-permission-text-viewmore' )
					.prop( 'href', '#' )
					.text( mw.msg( 'multimediaviewer-permission-viewmore' ) )
			);

		/**
		 * Original (HTML) version of the author's message
		 * This can be scary sometimes (huge tables, black text on dark purple background etc).
		 *
		 * @property {jQuery}
		 */
		this.$html = $( '<div>' )
			.addClass( 'mw-mmv-permission-html' )
			.appendTo( this.$box );

		/**
		 * "Close" button (does not actually close the box, just makes it smaller).
		 *
		 * @property {jQuery}
		 */
		this.$close = $( '<button>' )
			.addClass( 'mw-mmv-permission-close' )
			.on( 'click', () => {
				this.shrink();
			} )
			.appendTo( this.$box );

		/**
		 * Panel scroller from the metadata panel object.
		 *
		 * @property {MetadataPanelScroller}
		 */
		this.scroller = scroller;
	}

	/**
	 * Clear everything
	 */
	empty() {
		this.$box.addClass( 'empty' );
		this.$text.empty();
		this.$html.empty();
	}

	/**
	 * Set permission text/html
	 *
	 * @param {string} permission the text or HTML code written by the image author
	 */
	set( permission ) {
		this.$box.removeClass( 'empty' );

		this.$text.html( HtmlUtils.htmlToTextWithLinks( permission ) );
		this.$text.append( this.$fader );

		this.$html.html( permission );
	}

	/**
	 * @event Permission#mmv-permission-grow
	 */

	/**
	 * Enlarge the box, show HTML instead of text.
	 *
	 * @fires Permission#mmv-permission-grow
	 */
	grow() {
		this.$box.addClass( 'full-size' );
		this.$container.trigger( 'mmv-permission-grow' );
	}

	/**
	 * @event Permission#mmv-permission-shrink
	 */

	/**
	 * Limit the size of the box, show text only.
	 *
	 * @fires Permission#mmv-permission-shrink
	 */
	shrink() {
		this.$box.removeClass( 'full-size' );
		this.$container.trigger( 'mmv-permission-shrink' );
	}

	/**
	 * Returns whether the box is full-size.
	 *
	 * @return {boolean}
	 */
	isFullSize() {
		return this.$box.hasClass( 'full-size' );
	}
}

module.exports = Permission;
