/**
 * ProcessDialog windows encapsulate a {@link OO.ui.Process process} and all of the code necessary
 * to complete it. If the process terminates with an error, a customizable {@link OO.ui.Error error
 * interface} alerts users to the trouble, permitting the user to dismiss the error and try again when
 * relevant. The ProcessDialog class is always extended and customized with the actions and content
 * required for each process.
 *
 * The process dialog box consists of a header that visually represents the ‘working’ state of long
 * processes with an animation. The header contains the dialog title as well as
 * two {@link OO.ui.ActionWidget action widgets}:  a ‘safe’ action on the left (e.g., ‘Cancel’) and
 * a ‘primary’ action on the right (e.g., ‘Done’).
 *
 * Like other windows, the process dialog is managed by a {@link OO.ui.WindowManager window manager}.
 * Please see the [OOjs UI documentation on MediaWiki][1] for more information and examples.
 *
 *     @example
 *     // Example: Creating and opening a process dialog window.
 *     function MyProcessDialog( config ) {
 *         MyProcessDialog.super.call( this, config );
 *     }
 *     OO.inheritClass( MyProcessDialog, OO.ui.ProcessDialog );
 *
 *     MyProcessDialog.static.title = 'Process dialog';
 *     MyProcessDialog.static.actions = [
 *         { action: 'save', label: 'Done', flags: 'primary' },
 *         { label: 'Cancel', flags: 'safe' }
 *     ];
 *
 *     MyProcessDialog.prototype.initialize = function () {
 *         MyProcessDialog.super.prototype.initialize.apply( this, arguments );
 *         this.content = new OO.ui.PanelLayout( { padded: true, expanded: false } );
 *         this.content.$element.append( '<p>This is a process dialog window. The header contains the title and two buttons: \'Cancel\' (a safe action) on the left and \'Done\' (a primary action)  on the right.</p>' );
 *         this.$body.append( this.content.$element );
 *     };
 *     MyProcessDialog.prototype.getActionProcess = function ( action ) {
 *         var dialog = this;
 *         if ( action ) {
 *             return new OO.ui.Process( function () {
 *                 dialog.close( { action: action } );
 *             } );
 *         }
 *         return MyProcessDialog.super.prototype.getActionProcess.call( this, action );
 *     };
 *
 *     var windowManager = new OO.ui.WindowManager();
 *     $( 'body' ).append( windowManager.$element );
 *
 *     var dialog = new MyProcessDialog();
 *     windowManager.addWindows( [ dialog ] );
 *     windowManager.openWindow( dialog );
 *
 * [1]: https://www.mediawiki.org/wiki/OOjs_UI/Windows/Process_Dialogs
 *
 * @abstract
 * @class
 * @extends OO.ui.Dialog
 *
 * @constructor
 * @param {Object} [config] Configuration options
 */
OO.ui.ProcessDialog = function OoUiProcessDialog( config ) {
	// Parent constructor
	OO.ui.ProcessDialog.super.call( this, config );

	// Initialization
	this.$element.addClass( 'oo-ui-processDialog' );
};

/* Setup */

OO.inheritClass( OO.ui.ProcessDialog, OO.ui.Dialog );

/* Methods */

/**
 * Handle dismiss button click events.
 *
 * Hides errors.
 *
 * @private
 */
OO.ui.ProcessDialog.prototype.onDismissErrorButtonClick = function () {
	this.hideErrors();
};

/**
 * Handle retry button click events.
 *
 * Hides errors and then tries again.
 *
 * @private
 */
OO.ui.ProcessDialog.prototype.onRetryButtonClick = function () {
	this.hideErrors();
	this.executeAction( this.currentAction );
};

/**
 * @inheritdoc
 */
OO.ui.ProcessDialog.prototype.onActionResize = function ( action ) {
	if ( this.actions.isSpecial( action ) ) {
		this.fitLabel();
	}
	return OO.ui.ProcessDialog.super.prototype.onActionResize.call( this, action );
};

/**
 * @inheritdoc
 */
OO.ui.ProcessDialog.prototype.initialize = function () {
	// Parent method
	OO.ui.ProcessDialog.super.prototype.initialize.call( this );

	// Properties
	this.$navigation = $( '<div>' );
	this.$location = $( '<div>' );
	this.$safeActions = $( '<div>' );
	this.$primaryActions = $( '<div>' );
	this.$otherActions = $( '<div>' );
	this.dismissButton = new OO.ui.ButtonWidget( {
		label: OO.ui.msg( 'ooui-dialog-process-dismiss' )
	} );
	this.retryButton = new OO.ui.ButtonWidget();
	this.$errors = $( '<div>' );
	this.$errorsTitle = $( '<div>' );

	// Events
	this.dismissButton.connect( this, { click: 'onDismissErrorButtonClick' } );
	this.retryButton.connect( this, { click: 'onRetryButtonClick' } );

	// Initialization
	this.title.$element.addClass( 'oo-ui-processDialog-title' );
	this.$location
		.append( this.title.$element )
		.addClass( 'oo-ui-processDialog-location' );
	this.$safeActions.addClass( 'oo-ui-processDialog-actions-safe' );
	this.$primaryActions.addClass( 'oo-ui-processDialog-actions-primary' );
	this.$otherActions.addClass( 'oo-ui-processDialog-actions-other' );
	this.$errorsTitle
		.addClass( 'oo-ui-processDialog-errors-title' )
		.text( OO.ui.msg( 'ooui-dialog-process-error' ) );
	this.$errors
		.addClass( 'oo-ui-processDialog-errors oo-ui-element-hidden' )
		.append( this.$errorsTitle, this.dismissButton.$element, this.retryButton.$element );
	this.$content
		.addClass( 'oo-ui-processDialog-content' )
		.append( this.$errors );
	this.$navigation
		.addClass( 'oo-ui-processDialog-navigation' )
		.append( this.$safeActions, this.$location, this.$primaryActions );
	this.$head.append( this.$navigation );
	this.$foot.append( this.$otherActions );
};

/**
 * @inheritdoc
 */
OO.ui.ProcessDialog.prototype.getActionWidgets = function ( actions ) {
	var i, len, widgets = [];
	for ( i = 0, len = actions.length; i < len; i++ ) {
		widgets.push(
			new OO.ui.ActionWidget( $.extend( { framed: true }, actions[ i ] ) )
		);
	}
	return widgets;
};

/**
 * @inheritdoc
 */
OO.ui.ProcessDialog.prototype.attachActions = function () {
	var i, len, other, special, others;

	// Parent method
	OO.ui.ProcessDialog.super.prototype.attachActions.call( this );

	special = this.actions.getSpecial();
	others = this.actions.getOthers();
	if ( special.primary ) {
		this.$primaryActions.append( special.primary.$element );
	}
	for ( i = 0, len = others.length; i < len; i++ ) {
		other = others[ i ];
		this.$otherActions.append( other.$element );
	}
	if ( special.safe ) {
		this.$safeActions.append( special.safe.$element );
	}

	this.fitLabel();
	this.$body.css( 'bottom', this.$foot.outerHeight( true ) );
};

/**
 * @inheritdoc
 */
OO.ui.ProcessDialog.prototype.executeAction = function ( action ) {
	var process = this;
	return OO.ui.ProcessDialog.super.prototype.executeAction.call( this, action )
		.fail( function ( errors ) {
			process.showErrors( errors || [] );
		} );
};

/**
 * Fit label between actions.
 *
 * @private
 * @chainable
 */
OO.ui.ProcessDialog.prototype.fitLabel = function () {
	var width = Math.max(
		this.$safeActions.is( ':visible' ) ? this.$safeActions.width() : 0,
		this.$primaryActions.is( ':visible' ) ? this.$primaryActions.width() : 0
	);
	this.$location.css( { paddingLeft: width, paddingRight: width } );

	return this;
};

/**
 * Handle errors that occurred during accept or reject processes.
 *
 * @private
 * @param {OO.ui.Error[]|OO.ui.Error} errors Errors to be handled
 */
OO.ui.ProcessDialog.prototype.showErrors = function ( errors ) {
	var i, len, $item, actions,
		items = [],
		abilities = {},
		recoverable = true,
		warning = false;

	if ( errors instanceof OO.ui.Error ) {
		errors = [ errors ];
	}

	for ( i = 0, len = errors.length; i < len; i++ ) {
		if ( !errors[ i ].isRecoverable() ) {
			recoverable = false;
		}
		if ( errors[ i ].isWarning() ) {
			warning = true;
		}
		$item = $( '<div>' )
			.addClass( 'oo-ui-processDialog-error' )
			.append( errors[ i ].getMessage() );
		items.push( $item[ 0 ] );
	}
	this.$errorItems = $( items );
	if ( recoverable ) {
		abilities[this.currentAction] = true;
		// Copy the flags from the first matching action
		actions = this.actions.get( { actions: this.currentAction } );
		if ( actions.length ) {
			this.retryButton.clearFlags().setFlags( actions[0].getFlags() );
		}
	} else {
		abilities[this.currentAction] = false;
		this.actions.setAbilities( abilities );
	}
	if ( warning ) {
		this.retryButton.setLabel( OO.ui.msg( 'ooui-dialog-process-continue' ) );
	} else {
		this.retryButton.setLabel( OO.ui.msg( 'ooui-dialog-process-retry' ) );
	}
	this.retryButton.toggle( recoverable );
	this.$errorsTitle.after( this.$errorItems );
	this.$errors.removeClass( 'oo-ui-element-hidden' ).scrollTop( 0 );
};

/**
 * Hide errors.
 *
 * @private
 */
OO.ui.ProcessDialog.prototype.hideErrors = function () {
	this.$errors.addClass( 'oo-ui-element-hidden' );
	if ( this.$errorItems ) {
		this.$errorItems.remove();
		this.$errorItems = null;
	}
};

/**
 * @inheritdoc
 */
OO.ui.ProcessDialog.prototype.getTeardownProcess = function ( data ) {
	// Parent method
	return OO.ui.ProcessDialog.super.prototype.getTeardownProcess.call( this, data )
		.first( function () {
			// Make sure to hide errors
			this.hideErrors();
		}, this );
};