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

const { isMediaViewerEnabledOnClick } = require( 'mmv.head' );
const Dialog = require( './mmv.ui.dialog.js' );
const { helpLink } = require( '../config.json' );

/**
 * Represents the viewing options dialog and the link to open it.
 */
class OptionsDialog extends Dialog {
	/**
	 * @param {jQuery} $container the element to which the dialog will be appended
	 * @param {jQuery} $openButton the button which opens the dialog. Only used for positioning.
	 * @param {Config} config
	 */
	constructor( $container, $openButton, config ) {
		super( $container, $openButton, config );

		this.$dialog.addClass( 'mw-mmv-options-dialog' );
		this.eventPrefix = 'options';

		this.initPanel();
	}

	attach() {
		this.handleEvent( 'mmv-options-open', this.handleOpenCloseClick.bind( this ) );

		this.handleEvent( 'mmv-reuse-open', this.closeDialog.bind( this ) );
		this.handleEvent( 'mmv-download-open', this.closeDialog.bind( this ) );
	}

	/**
	 * Initialises UI elements.
	 */
	initPanel() {
		this.initEnableConfirmation();
		this.initDisableConfirmation();
		this.initEnableDiv();
		this.initDisableDiv();
	}

	/**
	 * Initialises the enable confirmation pane.
	 */
	initEnableConfirmation() {
		this.createConfirmationPane(
			'mw-mmv-enable-confirmation',
			'$enableConfirmation',
			[
				mw.msg( 'multimediaviewer-enable-confirmation-header' ),
				mw.msg( 'multimediaviewer-enable-confirmation-text', mw.config.get( 'wgSiteName' ) )
			] );
	}

	/**
	 * Initialises the disable confirmation pane.
	 */
	initDisableConfirmation() {
		this.createConfirmationPane(
			'mw-mmv-disable-confirmation',
			'$disableConfirmation',
			[
				mw.msg( 'multimediaviewer-disable-confirmation-header' ),
				mw.msg( 'multimediaviewer-disable-confirmation-text', mw.config.get( 'wgSiteName' ) )
			] );
	}

	/**
	 * Initialises the enable action pane.
	 */
	initEnableDiv() {
		this.createActionPane(
			'mw-mmv-options-enable',
			'$enableDiv',
			mw.msg( 'multimediaviewer-enable-submit-button' ),
			[
				mw.msg( 'multimediaviewer-enable-dialog-header' ),
				mw.msg( 'multimediaviewer-enable-text-header' )
			], true );
	}

	/**
	 * Initialises the disable action pane.
	 */
	initDisableDiv() {
		this.createActionPane(
			'mw-mmv-options-disable',
			'$disableDiv',
			mw.msg( 'multimediaviewer-option-submit-button' ),
			[
				mw.msg( 'multimediaviewer-options-dialog-header' ),
				mw.msg( 'multimediaviewer-options-text-header' ),
				mw.msg( 'multimediaviewer-options-text-body' )
			], false );
	}

	/**
	 * Hides all of the divs.
	 */
	hideDivs() {
		this.$dialog.removeClass( 'mw-mmv-disable-confirmation-shown mw-mmv-enable-confirmation-shown mw-mmv-enable-div-shown' );

		this.$disableDiv
			.add( this.$disableConfirmation )
			.add( this.$enableDiv )
			.add( this.$enableConfirmation )
			.removeClass( 'mw-mmv-shown' );
	}

	/**
	 * Shows the confirmation div for the disable action.
	 */
	showDisableConfirmation() {
		this.hideDivs();
		this.$disableConfirmation.addClass( 'mw-mmv-shown' );
		this.$dialog.addClass( 'mw-mmv-disable-confirmation-shown' );
	}

	/**
	 * Shows the confirmation div for the enable action.
	 */
	showEnableConfirmation() {
		this.hideDivs();
		this.$enableConfirmation.addClass( 'mw-mmv-shown' );
		this.$dialog.addClass( 'mw-mmv-enable-confirmation-shown' );
	}

	/**
	 * Fired when the dialog is opened.
	 *
	 * @event OptionsDialog#mmv-options-opened
	 */

	/**
	 * Opens a dialog with information about file reuse.
	 */
	openDialog() {
		if ( isMediaViewerEnabledOnClick() ) {
			this.$disableDiv.addClass( 'mw-mmv-shown' );
		} else {
			this.$enableDiv.addClass( 'mw-mmv-shown' );
			this.$dialog.addClass( 'mw-mmv-enable-div-shown' );
		}

		super.openDialog();
		$( document ).trigger( 'mmv-options-opened' );
	}

	/**
	 * Fired when the dialog is closed.
	 *
	 * @event OptionsDialog#mmv-options-closed
	 */

	/**
	 * Closes the options dialog.
	 *
	 * @param {Event} [e] Event object when the close action is caused by a user
	 *   action, as opposed to closing the window or something.
	 */
	closeDialog( e ) {
		const wasConfirmation = this.$dialog.is( '.mw-mmv-disable-confirmation-shown' ) || this.$dialog.is( '.mw-mmv-enable-confirmation-shown' );

		super.closeDialog();
		$( document ).trigger( 'mmv-options-closed' );
		this.hideDivs();

		if ( e && $( e.target ).is( '.mw-mmv-options-button' ) && wasConfirmation ) {
			this.openDialog();
		}
	}

	/**
	 * Creates a confirmation pane.
	 *
	 * @param {string} divClass Class applied to main div.
	 * @param {string} propName Name of the property on this object to which we'll assign the div.
	 * @param {string} msgs See #addText
	 */
	createConfirmationPane( divClass, propName, msgs ) {
		const $div = $( '<div>' )
			// The following classes are used here:
			// * mw-mmv-enable-confirmation
			// * mw-mmv-disable-confirmation
			.addClass( divClass )
			.appendTo( this.$dialog );

		$( '<div>' )
			.text( '\u00A0' )
			.addClass( 'mw-mmv-confirmation-close' )
			.on( 'click', () => this.closeDialog() )
			.appendTo( $div );

		this.addText( $div, msgs );

		this[ propName ] = $div;
	}

	/**
	 * Creates an action pane.
	 *
	 * @param {string} divClass Class applied to main div.
	 * @param {string} propName Name of the property on this object to which we'll assign the div.
	 * @param {string} smsg Message for the submit button.
	 * @param {string} msgs See #addText
	 * @param {boolean} enabled Whether this dialog is an enable one.
	 */
	createActionPane( divClass, propName, smsg, msgs, enabled ) {
		const $div = $( '<div>' )
			// The following classes are used here:
			// * mw-mmv-options-enable
			// * mw-mmv-options-disable
			.addClass( divClass )
			.appendTo( this.$dialog );

		if ( enabled ) {
			$( '<div>' )
				.addClass( 'mw-mmv-options-enable-alert' )
				.text( mw.msg( 'multimediaviewer-enable-alert' ) )
				.appendTo( $div );
		}

		this.addText( $div, msgs );
		this.addInfoLink( $div );
		this.makeButtons( $div, smsg, enabled );

		this[ propName ] = $div;
	}

	/**
	 * Creates buttons for the dialog.
	 *
	 * @param {jQuery} $container
	 * @param {string} smsg Message for the submit button.
	 * @param {boolean} enabled Whether the viewer is enabled after this dialog is submitted.
	 */
	makeButtons( $container, smsg, enabled ) {
		const $submitDiv = $( '<div>' )
			.addClass( 'mw-mmv-options-submit' )
			.appendTo( $container );

		this.makeSubmitButton(
			$submitDiv,
			smsg,
			enabled
		);

		this.makeCancelButton( $submitDiv );
	}

	/**
	 * Makes a submit button for one of the panels.
	 *
	 * @param {jQuery} $submitDiv The div for the buttons in the dialog.
	 * @param {string} msg The string to put in the button.
	 * @param {boolean} enabled Whether to turn the viewer on or off when this button is pressed.
	 * @return {jQuery} Submit button
	 */
	makeSubmitButton( $submitDiv, msg, enabled ) {
		return $( '<button>' )
			.addClass( 'mw-mmv-options-submit-button cdx-button cdx-button--action-progressive cdx-button--weight-primary' )
			.text( msg )
			.appendTo( $submitDiv )
			.on( 'click', () => {
				const $buttons = $( this ).closest( '.mw-mmv-options-submit' ).find( '.mw-mmv-options-submit-button, .mw-mmv-options-cancel-button' );
				$buttons.prop( 'disabled', true );

				this.config.setMediaViewerEnabledOnClick( enabled ).done( () => {
					if ( enabled ) {
						this.showEnableConfirmation();
					} else {
						this.showDisableConfirmation();
					}
				} ).always( () => {
					$buttons.prop( 'disabled', false );
				} );

				return false;
			} );
	}

	/**
	 * Makes a cancel button for one of the panels.
	 *
	 * @param {jQuery} $submitDiv The div for the buttons in the dialog.
	 * @return {jQuery} Cancel button
	 */
	makeCancelButton( $submitDiv ) {
		return $( '<button>' )
			.addClass( 'mw-mmv-options-cancel-button cdx-button cdx-button--weight-quiet' )
			.text( mw.msg( 'multimediaviewer-option-cancel-button' ) )
			.appendTo( $submitDiv )
			.on( 'click', () => {
				this.closeDialog();
				return false;
			} );
	}

	/**
	 * Adds text to a dialog.
	 *
	 * @param {jQuery} $container
	 * @param {string[]} msgs The messages to be added.
	 */
	addText( $container, msgs ) {
		const $text = $( '<div>' )
			.addClass( 'mw-mmv-options-text' );

		const adders = [
			( msg ) => {
				$( '<h3>' )
					.text( msg )
					.addClass( 'mw-mmv-options-dialog-header' )
					.appendTo( $container );
			},

			( msg ) => {
				$( '<p>' )
					.text( msg )
					.addClass( 'mw-mmv-options-text-header' )
					.appendTo( $text );
			},

			( msg ) => {
				$( '<p>' )
					.text( msg )
					.addClass( 'mw-mmv-options-text-body' )
					.appendTo( $text );
			}
		];

		for ( let i = 0; i < msgs.length && i < adders.length; i++ ) {
			adders[ i ]( msgs[ i ] );
		}

		$text.appendTo( $container );
	}

	/**
	 * Adds the info link to the panel.
	 *
	 * @param {jQuery} $div The panel to which we're adding the link.
	 */
	addInfoLink( $div ) {
		$( '<a>' )
			.addClass( 'mw-mmv-project-info-link' )
			.prop( 'href', helpLink )
			.text( mw.message( 'multimediaviewer-options-learn-more' ) )
			.appendTo( $div.find( '.mw-mmv-options-text' ) );
	}
}

module.exports = OptionsDialog;