/*!
 * VisualEditor user interface MWTransclusionDialog class.
 *
 * @copyright 2011-2020 VisualEditor Team and others; see AUTHORS.txt
 * @license The MIT License (MIT); see LICENSE.txt
 */

/**
 * Dialog for inserting and editing MediaWiki transclusions, i.e. a sequence of one or more template
 * invocations that strictly belong to each other (e.g. because they are unbalanced), possibly
 * mixed with raw wikitext snippets.
 *
 * Note the base class {@see ve.ui.MWTemplateDialog} alone does not allow to manage more than a
 * single template invocation. Most of the code for this feature set is exclusive to this subclass.
 *
 * @class
 * @extends ve.ui.MWTemplateDialog
 *
 * @constructor
 * @param {Object} [config] Configuration options
 */
ve.ui.MWTransclusionDialog = function VeUiMWTransclusionDialog( config ) {
	// Parent constructor
	ve.ui.MWTransclusionDialog.super.call( this, config );

	// Properties
	this.isSidebarExpanded = null;
	this.closeButton = null;
	this.backButton = null;

	this.resetConfirmation = new OO.ui.FieldsetLayout( {
		classes: [ 'oo-ui-processDialog-errors' ]
	} );
	this.resetConfirmationTitle = new OO.ui.LabelWidget( {
		label: OO.ui.deferMsg( 'visualeditor-dialog-transclusion-reset-confirmation-title' )
	} );
	this.resetConfirmationMessage = new OO.ui.MessageWidget( {
		label: OO.ui.deferMsg( 'visualeditor-dialog-transclusion-reset-confirmation-message' ),
		type: 'error'
	} );
	this.resetConfirmationCancelButton = new OO.ui.ButtonWidget( {
		label: OO.ui.deferMsg( 'visualeditor-dialog-transclusion-reset-confirmation-cancel' )
	} );
	this.resetConfirmationResetButton = new OO.ui.ButtonWidget( {
		label: OO.ui.deferMsg( 'visualeditor-dialog-transclusion-reset-confirmation-reset' ),
		flags: [ 'primary', 'destructive' ]
	} );

	// Events
	this.resetConfirmationCancelButton.connect( this, {
		click: 'resetConfirmationHide'
	} );
	this.resetConfirmationResetButton.connect( this, {
		click: 'resetConfirmationReset'
	} );

	// Initialization
	this.resetConfirmation.addItems( [
		new OO.ui.HorizontalLayout( {
			items: [ this.resetConfirmationTitle ],
			classes: [ 'oo-ui-processDialog-errors-title' ]
		} ),
		this.resetConfirmationMessage,
		new OO.ui.HorizontalLayout( {
			items: [ this.resetConfirmationCancelButton, this.resetConfirmationResetButton ],
			classes: [ 'oo-ui-processDialog-errors-actions' ]
		} )
	] );
	this.resetConfirmation.toggle( false );
	this.$content.append( this.resetConfirmation.$element );

	// Temporary override while feature flag is in place.
	this.isBigger = mw.config.get( 'wgVisualEditorConfig' ).transclusionDialogInlineDescriptions;
	if ( this.isBigger ) {
		this.$element.addClass( 've-ui-mwTransclusionDialog-bigger' );
	}

	// Temporary change bolding while feature flag is in place.
	if ( mw.config.get( 'wgVisualEditorConfig' ).templateSearchImprovements ) {
		this.$element.addClass( 've-ui-mwTransclusionDialog-enhancedSearch' );
	}
};

/* Inheritance */

OO.inheritClass( ve.ui.MWTransclusionDialog, ve.ui.MWTemplateDialog );

/* Static Properties */

ve.ui.MWTransclusionDialog.static.name = 'transclusion';

ve.ui.MWTransclusionDialog.static.title =
	OO.ui.deferMsg( 'visualeditor-dialog-transclusion-title-edit-transclusion' );

ve.ui.MWTransclusionDialog.static.actions = ve.ui.MWTemplateDialog.static.actions.concat( [
	{
		action: 'mode',
		modes: [ 'edit', 'insert' ],
		// HACK: Will be set later, but we want measurements to be accurate in the mean time, this
		// will not be needed when T93290 is resolved
		label: $( document.createTextNode( '\u00a0' ) )
	},
	{
		action: 'back',
		label: OO.ui.deferMsg( 'visualeditor-dialog-action-goback' ),
		modes: [ 'edit', 'insert' ],
		flags: [ 'safe', 'back' ]
	}
] );

ve.ui.MWTransclusionDialog.static.bookletLayoutConfig = ve.extendObject(
	{},
	ve.ui.MWTemplateDialog.static.bookletLayoutConfig,
	{ outlined: true, editable: true }
);

/* Methods */

/**
 * Handle outline controls move events.
 *
 * @param {number} places Number of places to move the selected item
 */
ve.ui.MWTransclusionDialog.prototype.onOutlineControlsMove = function ( places ) {
	var parts = this.transclusionModel.getParts(),
		itemId = this.transclusions.getFocusedPart();

	if ( itemId ) {
		var part = this.transclusionModel.getPartFromId( itemId );
		// Move part to new location, and if dialog is loaded switch to new part page
		var promise = this.transclusionModel.addPart( part, parts.indexOf( part ) + places );
		if ( this.loaded && !this.preventReselection ) {
			promise.done( this.transclusions.focusPart.bind( this.transclusions, part.getId() ) );
		}
	}
};

/**
 * Handle outline controls remove events.
 */
ve.ui.MWTransclusionDialog.prototype.onOutlineControlsRemove = function () {
	var id = this.transclusions.getFocusedPart();

	if ( id ) {
		var part = this.transclusionModel.getPartFromId( id );
		// Check if the part is the actual template, or one of its parameters
		if ( part instanceof ve.dm.MWTemplateModel && id !== part.getId() ) {
			var param = part.getParameterFromId( id );
			if ( param instanceof ve.dm.MWParameterModel ) {
				part.removeParameter( param );
			}
		} else if ( part instanceof ve.dm.MWTransclusionPartModel ) {
			this.transclusionModel.removePart( part );
		}
	}
};

/**
 * Handle add template button click events.
 */
ve.ui.MWTransclusionDialog.prototype.onAddTemplateButtonClick = function () {
	this.addPart( new ve.dm.MWTemplatePlaceholderModel( this.transclusionModel ) );
};

/**
 * Handle add content button click events.
 */
ve.ui.MWTransclusionDialog.prototype.onAddContentButtonClick = function () {
	this.addPart( new ve.dm.MWTransclusionContentModel( this.transclusionModel ) );
};

/**
 * Handle add parameter button click events.
 */
ve.ui.MWTransclusionDialog.prototype.onAddParameterButtonClick = function () {
	var partId = this.transclusions.getFocusedPart();
	if ( !partId ) {
		return;
	}

	var part = this.transclusionModel.getPartFromId( partId );
	if ( !( part instanceof ve.dm.MWTemplateModel ) ) {
		return;
	}

	// TODO: Use a distinct class for placeholder model rather than
	// these magical "empty" constants.
	part.addParameter( new ve.dm.MWParameterModel( part ) );
};

/**
 * Handle booklet layout page set events.
 *
 * @param {OO.ui.PageLayout} page Active page
 */
ve.ui.MWTransclusionDialog.prototype.onBookletLayoutSet = function ( page ) {
	var isPlaceholder = page instanceof ve.ui.MWTemplatePlaceholderPage,
		acceptsNewParameters = page instanceof ve.ui.MWTemplatePage ||
			page instanceof ve.ui.MWParameterPage,
		isRequired = page instanceof ve.ui.MWParameterPage && page.parameter.isRequired(),
		canNotRemove = isRequired ||
			( isPlaceholder && this.transclusionModel.getParts().length === 1 );

	this.addParameterButton.setDisabled( !acceptsNewParameters || this.isReadOnly() );
	this.bookletLayout.getOutlineControls().removeButton.toggle( !canNotRemove );
};

/**
 * @inheritdoc
 */
ve.ui.MWTransclusionDialog.prototype.onReplacePart = function ( removed, added ) {
	ve.ui.MWTransclusionDialog.super.prototype.onReplacePart.call( this, removed, added );

	if ( this.transclusionModel.getParts().length === 0 ) {
		this.addParameterButton.setDisabled( true );
		this.addPart( new ve.dm.MWTemplatePlaceholderModel( this.transclusionModel ) );
	}

	var canCollapse = this.isSingleTemplateTransclusion();
	this.actions.setAbilities( { mode: canCollapse } );
	this.updateActionSet();
};

/**
 * @return {boolean} True if the dialog contains a single template or template placeholder. False
 *  otherwise. Also false if there is no data model connected yet.
 */
ve.ui.MWTransclusionDialog.prototype.isSingleTemplateTransclusion = function () {
	var parts = this.transclusionModel && this.transclusionModel.getParts();

	return parts && parts.length === 1 && (
		parts[ 0 ] instanceof ve.dm.MWTemplateModel ||
		parts[ 0 ] instanceof ve.dm.MWTemplatePlaceholderModel
	);
};

/**
 * @inheritdoc
 */
ve.ui.MWTransclusionDialog.prototype.getPageFromPart = function ( part ) {
	var page = ve.ui.MWTransclusionDialog.super.prototype.getPageFromPart.call( this, part );
	if ( !page && part instanceof ve.dm.MWTransclusionContentModel ) {
		return new ve.ui.MWTransclusionContentPage( part, part.getId(), { $overlay: this.$overlay, isReadOnly: this.isReadOnly() } );
	}
	return page;
};

/**
 * Set if the dialog is expanded and the sidebar visible, or collapsed. `auto` will choose
 * `collapsed` if possible.
 *
 * @param {boolean|string} [expand=true] True or false to expand or collapse the sidebar, or
 *  'auto' to auto-detect based on the dialog's current content.
 * @private
 */
ve.ui.MWTransclusionDialog.prototype.toggleSidebar = function ( expand ) {
	var isExpanded;
	if ( expand === 'auto' && this.isSingleTemplateTransclusion() ) {
		isExpanded = false;
	} else {
		isExpanded = expand !== false;
	}

	if ( this.isSidebarExpanded !== isExpanded ) {
		this.isSidebarExpanded = isExpanded;
		if ( this.$content ) {
			this.$content
				.toggleClass( 've-ui-mwTransclusionDialog-collapsed', !isExpanded )
				.toggleClass( 've-ui-mwTransclusionDialog-expanded', isExpanded );
		}
		this.setSize( isExpanded ? ( this.isBigger ? 'larger' : 'large' ) : 'medium' );
		this.bookletLayout.toggleOutline( isExpanded );
		this.updateTitle();
		this.updateModeActionState();

		// HACK blur any active input so that its dropdown will be hidden and won't end
		// up being mispositioned
		this.$content.find( 'input:focus' ).trigger( 'blur' );
	}
};

/**
 * Update the dialog title.
 */
ve.ui.MWTransclusionDialog.prototype.updateTitle = function () {
	if ( !this.isSingleTemplateTransclusion() ) {
		this.title.setLabel( this.constructor.static.title );
	} else {
		// Parent method
		ve.ui.MWTransclusionDialog.super.prototype.updateTitle.call( this );
	}
};

/**
 * Update the state of the 'mode' action
 */
ve.ui.MWTransclusionDialog.prototype.updateModeActionState = function () {
	var parts = this.transclusionModel && this.transclusionModel.getParts(),
		isExpanded = this.isSidebarExpanded,
		label = ve.msg( isExpanded ?
			'visualeditor-dialog-transclusion-collapse-options' :
			'visualeditor-dialog-transclusion-expand-options' );

	this.actions.forEach( { actions: [ 'mode' ] }, function ( action ) {
		action.setLabel( label );
		action.$button.attr( 'aria-expanded', isExpanded ? 1 : 0 );
	} );

	// Decide whether the button should be enabled or not. It needs to be:
	// * disabled when we're in the initial add-new-template phase, because it's
	//   meaningless
	// * disabled if we're in a multi-part transclusion, because the sidebar's
	//   forced open
	// * enabled if we're in a single-part transclusion, because the sidebar's
	//   closed but can be opened to add more parts
	if ( parts ) {
		var canCollapse = this.isSingleTemplateTransclusion() &&
			!( parts[ 0 ] instanceof ve.dm.MWTemplatePlaceholderModel );
		this.actions.setAbilities( { mode: canCollapse } );
	}
};

/**
 * Add a part to the transclusion.
 *
 * @param {ve.dm.MWTransclusionPartModel} part Part to add
 */
ve.ui.MWTransclusionDialog.prototype.addPart = function ( part ) {
	var parts = this.transclusionModel.getParts(),
		itemId = this.transclusions.getFocusedPart();

	if ( part ) {
		// Insert after selected part, or at the end if nothing is selected
		var index = itemId ?
			parts.indexOf( this.transclusionModel.getPartFromId( itemId ) ) + 1 :
			parts.length;
		// Add the part, and if dialog is loaded switch to part page
		var promise = this.transclusionModel.addPart( part, index );
		if ( this.loaded && !this.preventReselection ) {
			promise.done( this.transclusions.focusPart.bind( this.transclusions, part.getId() ) );
		}
	}
};

/**
 * @inheritdoc
 */
ve.ui.MWTransclusionDialog.prototype.getActionProcess = function ( action ) {
	if ( action === 'back' ) {
		if ( this.isEmpty() ) {
			return this.getActionProcess( 'reset' );
		}
		return new OO.ui.Process( function () {
			this.resetConfirmation.toggle( true );
		}, this );
	}

	if ( action === 'reset' ) {
		return new OO.ui.Process( function () {
			this.resetDialog();
		}, this );
	}

	if ( action === 'mode' ) {
		return new OO.ui.Process( function () {
			this.toggleSidebar( !this.isSidebarExpanded );
		}, this );
	}

	return ve.ui.MWTransclusionDialog.super.prototype.getActionProcess.call( this, action );
};

/**
 * Update the widgets in the dialog's action bar.
 */
ve.ui.MWTransclusionDialog.prototype.updateActionSet = function () {
	var veConfig = mw.config.get( 'wgVisualEditorConfig' ),
		backButton = this.actions.get( { flags: [ 'back' ] } ).pop(),
		saveButton = this.actions.get( { actions: [ 'done' ] } ).pop();

	if ( saveButton && this.getMode() === 'edit' ) {
		saveButton.setLabel( ve.msg( 'visualeditor-dialog-transclusion-action-save' ) );
	}

	if ( backButton ) {
		// Todo: this won't be needed if https://gerrit.wikimedia.org/r/c/oojs/ui/+/686439 is resolved
		this.backButton = backButton;
	}

	// T283511
	if ( !this.backButton ) {
		return;
	}

	if ( veConfig.transclusionDialogBackButton ) {
		var closeButton = this.actions.get( { flags: [ 'close' ] } ).pop(),
			parts = this.transclusionModel && this.transclusionModel.getParts(),
			isInitialPage = parts && parts.length === 1 && parts[ 0 ] instanceof ve.dm.MWTemplatePlaceholderModel,
			isInsertMode = this.getMode() === 'insert';

		if ( closeButton ) {
			// Todo: this won't be needed if https://gerrit.wikimedia.org/r/c/oojs/ui/+/686439 is resolved
			this.closeButton = closeButton;
		}

		this.closeButton.toggle( !isInsertMode || isInitialPage );
		this.backButton.toggle( isInsertMode && !isInitialPage );
	} else {
		this.backButton.toggle( false );
	}
};

/**
 * Dismisses the reset confirmation.
 */
ve.ui.MWTransclusionDialog.prototype.resetConfirmationHide = function () {
	this.resetConfirmation.toggle( false );
};

/**
 * Dismisses the reset confirmation and runs the reset action.
 */
ve.ui.MWTransclusionDialog.prototype.resetConfirmationReset = function () {
	this.resetConfirmationHide();
	this.executeAction( 'reset' );
};

/**
 * Revert the dialog back to its initial state.
 */
ve.ui.MWTransclusionDialog.prototype.resetDialog = function () {
	var target = this;
	this.transclusionModel.reset();
	this.bookletLayout.clearPages();
	this.transclusionModel
		.addPart( new ve.dm.MWTemplatePlaceholderModel( this.transclusionModel ), 0 )
		.done( function () {
			target.toggleSidebar( false );
			target.updateModeActionState();
		} );
};

/**
 * @return {boolean} False if any transclusion part contains non-default input
 */
ve.ui.MWTransclusionDialog.prototype.isEmpty = function () {
	return this.transclusionModel.getParts().every( function ( part ) {
		return part.isEmpty();
	} );
};

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

	// Properties
	this.addTemplateButton = new OO.ui.ButtonWidget( {
		framed: false,
		icon: 'puzzle',
		title: ve.msg( 'visualeditor-dialog-transclusion-add-template' )
	} );
	this.addContentButton = new OO.ui.ButtonWidget( {
		framed: false,
		icon: 'wikiText',
		title: ve.msg( 'visualeditor-dialog-transclusion-add-content' )
	} );
	this.addParameterButton = new OO.ui.ButtonWidget( {
		framed: false,
		icon: 'parameter',
		title: ve.msg( 'visualeditor-dialog-transclusion-add-param' )
	} );

	// Events
	this.bookletLayout.connect( this, { set: 'onBookletLayoutSet' } );
	this.bookletLayout.$menu.find( '[ role="listbox" ]' ).first().attr( 'aria-label', ve.msg( 'visualeditor-dialog-transclusion-templates-menu-aria-label' ) );
	this.addTemplateButton.connect( this, { click: 'onAddTemplateButtonClick' } );
	this.addContentButton.connect( this, { click: 'onAddContentButtonClick' } );
	this.addParameterButton.connect( this, { click: 'onAddParameterButtonClick' } );
	this.bookletLayout.getOutlineControls()
		.addItems( [ this.addTemplateButton, this.addContentButton, this.addParameterButton ] )
		.connect( this, {
			move: 'onOutlineControlsMove',
			remove: 'onOutlineControlsRemove'
		} );
};

/**
 * @inheritdoc
 */
ve.ui.MWTransclusionDialog.prototype.getSetupProcess = function ( data ) {
	return ve.ui.MWTransclusionDialog.super.prototype.getSetupProcess.call( this, data )
		.next( function () {
			var isReadOnly = this.isReadOnly();
			this.addTemplateButton.setDisabled( isReadOnly );
			this.addContentButton.setDisabled( isReadOnly );
			this.addParameterButton.setDisabled( isReadOnly );
			this.bookletLayout.getOutlineControls().setAbilities( {
				move: !isReadOnly,
				remove: !isReadOnly
			} );

			this.updateModeActionState();
			this.toggleSidebar( 'auto' );
		}, this );
};

/**
 * @inheritdoc
 *
 * Temporary override to increase dialog size when a feature flag is enabled.
 */
ve.ui.MWTransclusionDialog.prototype.getSizeProperties = function () {
	var sizeProps = ve.ui.MWTransclusionDialog.super.prototype.getSizeProperties.call( this );

	if ( this.isBigger ) {
		sizeProps = ve.extendObject( { height: '90%' }, sizeProps );
	}

	return sizeProps;
};

/* Registration */

ve.ui.windowFactory.register( ve.ui.MWTransclusionDialog );