/**
 * TemplateData Dialog
 * @param {Object} config Dialog configuration object
 */
mw.TemplateData.Dialog = function mwTemplateDataDialog( config ) {
	// Parent constructor
	mw.TemplateData.Dialog.super.call( this, config );

	this.model = null;
	this.language = null;
	this.availableLanguages = [];
	this.selectedParamKey = '';
	this.propInputs = {};
	this.propFieldLayout = {};

	// Initialize
	this.$element.addClass( 'tdg-TemplateDataDialog' );
};

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

/* Static properties */
mw.TemplateData.Dialog.static.name = 'TemplateDataDialog';
mw.TemplateData.Dialog.static.title = mw.msg( 'templatedata-modal-title' );
mw.TemplateData.Dialog.static.size = 'large';
mw.TemplateData.Dialog.static.actions = [
	{
		action: 'apply',
		label: mw.msg( 'templatedata-modal-button-apply' ),
		flags: [ 'primary', 'constructive' ],
		modes: 'list'
	},
	{
		action: 'add',
		label: mw.msg( 'templatedata-modal-button-addparam' ),
		flags: [ 'constructive' ],
		modes: 'list'
	},
	{
		action: 'delete',
		label: mw.msg( 'templatedata-modal-button-delparam' ),
		modes: 'edit',
		flags: 'destructive'
	},
	{
		label: mw.msg( 'templatedata-modal-button-cancel' ),
		flags: 'safe',
		modes: [ 'list', 'error' ]
	},
	{
		action: 'back',
		label: mw.msg( 'templatedata-modal-button-back' ),
		flags: 'safe',
		modes: [ 'edit', 'language', 'add' ]
	}
];

/**
 * @inheritDoc
 */
mw.TemplateData.Dialog.prototype.initialize = function () {
	var templateParamsFieldset, addParamFieldlayout, languageActionFieldLayout,
		paramOrderFieldset;

	// Parent method
	mw.TemplateData.Dialog.super.prototype.initialize.call( this );

	this.$spinner = this.$( '<div>' ).addClass( 'tdg-spinner' ).text( 'working...' );
	this.$body.append( this.$spinner );

	this.noticeLabel = new OO.ui.LabelWidget( { $: this.$ } );
	this.noticeLabel.$element.hide();

	this.panels = new OO.ui.StackLayout( { $: this.$, continuous: false } );

	this.listParamsPanel = new OO.ui.PanelLayout( {
		$: this.$,
		scrollable: true
	} );
	this.editParamPanel = new OO.ui.PanelLayout( {
		$: this.$
	} );
	this.languagePanel = new OO.ui.PanelLayout( {
		$: this.$
	} );
	this.addParamPanel = new OO.ui.PanelLayout( {
		$: this.$
	} );

	// Language panel
	this.newLanguageSearchWidget = new mw.TemplateData.LanguageSearchWidget( {
		$: this.$
	} );

	// Add parameter panel
	this.newParamInput = new OO.ui.TextInputWidget( {
		$: this.$,
		placeholder: mw.msg( 'templatedata-modal-placeholder-paramkey' )
	} );
	this.addParamButton = new OO.ui.ButtonWidget( {
		$: this.$,
		label: mw.msg( 'templatedata-modal-button-addparam' )
	} );
	addParamFieldlayout = new OO.ui.FieldsetLayout( {
		$: this.$,
		label: mw.msg( 'templatedata-modal-title-addparam' ),
		items: [ this.newParamInput, this.addParamButton ]
	} );

	// Param list panel (main)
	this.languageDropdownWidget = new OO.ui.DropdownWidget( { $: this.$ } );
	this.languagePanelButton = new OO.ui.ButtonWidget( {
		$: this.$,
		label: mw.msg( 'templatedata-modal-button-add-language' )
	} );
	languageActionFieldLayout = new OO.ui.ActionFieldLayout(
		this.languageDropdownWidget,
		this.languagePanelButton,
		{
			$: this.$,
			align: 'left',
			label: mw.msg( 'templatedata-modal-title-language' )
		}
	);

	// ParamOrder
	this.paramOrderWidget = new mw.TemplateData.DragDropWidget( {
		$: this.$,
		orientation: 'horizontal'
	} );
	paramOrderFieldset = new OO.ui.FieldsetLayout( {
		$: this.$,
		label: mw.msg( 'templatedata-modal-title-paramorder' ),
		items: [ this.paramOrderWidget ]
	} );

	this.descriptionInput = new OO.ui.TextInputWidget( {
		$: this.$,
		multiline: true,
		autosize: true
	} );
	this.templateDescriptionFieldset = new OO.ui.FieldsetLayout( {
		$: this.$,
		items: [ this.descriptionInput ]
	} );
	this.paramListNoticeLabel = new OO.ui.LabelWidget( { $: this.$ } );
	this.paramListNoticeLabel.$element.hide();

	this.paramSelectWidget = new OO.ui.SelectWidget();
	templateParamsFieldset = new OO.ui.FieldsetLayout( {
		$: this.$,
		label: mw.msg( 'templatedata-modal-title-templateparams' )
	} );
	templateParamsFieldset.$element.append( this.paramSelectWidget.$element );

	// Param details panel
	this.$paramDetailsContainer = this.$( '<div>' )
		.addClass( 'tdg-TemplateDataDialog-paramDetails' );

	this.listParamsPanel.$element
		.addClass( 'tdg-templateDataDialog-listParamsPanel' )
		.append(
			this.paramListNoticeLabel.$element,
			languageActionFieldLayout.$element,
			this.templateDescriptionFieldset.$element,
			paramOrderFieldset.$element,
			templateParamsFieldset.$element
		);
	this.paramEditNoticeLabel = new OO.ui.LabelWidget( { $: this.$ } );
	this.paramEditNoticeLabel.$element.hide();
	// Edit panel
	this.editParamPanel.$element
		.addClass( 'tdg-templateDataDialog-editParamPanel' )
		.append(
			this.paramEditNoticeLabel.$element,
			this.$paramDetailsContainer
		);
	// Language panel
	this.languagePanel.$element
		.addClass( 'tdg-templateDataDialog-languagePanel' )
		.append(
			this.newLanguageSearchWidget.$element
		);
	this.addParamPanel.$element
		.addClass( 'tdg-templateDataDialog-addParamPanel' )
		.append( addParamFieldlayout.$element );

	this.panels.addItems( [
		this.listParamsPanel,
		this.editParamPanel,
		this.languagePanel,
		this.addParamPanel
	] );
	this.panels.setItem( this.listParamsPanel );
	this.panels.$element.addClass( 'tdg-TemplateDataDialog-panels' );

	// Build param details panel
	this.$paramDetailsContainer.append( this.createParamDetails() );

	// Initialization
	this.$body.append(
		this.noticeLabel.$element,
		this.panels.$element
	);

	// Events
	this.newLanguageSearchWidget.connect( this, { select: 'newLanguageSearchWidgetSelect' } );
	this.newParamInput.connect( this, { change: 'onAddParamInputChange' } );
	this.addParamButton.connect( this, { click: 'onAddParamButtonClick' } );
	this.descriptionInput.connect( this, { change: 'onDescriptionInputChange' } );
	this.paramOrderWidget.connect( this, { reorder: 'onParamOrderWidgetReorder' } );
	this.languagePanelButton.connect( this, { click: 'onLanguagePanelButton' } );
	this.languageDropdownWidget.getMenu().connect( this, { choose: 'onLanguageDropdownWidgetChoose' } );
	this.paramSelectWidget.connect( this, { choose: 'onParamSelectWidgetChoose' } );
};

/**
 * Respond to model change of description event
 * @param {jQuery.event} event Event details
 * @param {string} description New description
 */
mw.TemplateData.Dialog.prototype.onModelChangeDescription = function ( description ) {
	this.descriptionInput.setValue( description );
};

mw.TemplateData.Dialog.prototype.onAddParamInputChange = function ( value ) {
	var allProps = mw.TemplateData.Model.static.getAllProperties( true );

	if (
		value.match( allProps.name.restrict ) ||
		(
			this.model.isParamExists( value ) &&
			!this.model.isParamDeleted( value )
		)
	) {
		// Disable the add button
		this.addParamButton.setDisabled( true );
	} else {
		this.addParamButton.setDisabled( false );
	}
};

/**
 * Respond to change of paramOrder from the model
 * @param {string[]} paramOrderArray The array of keys in order
 */
mw.TemplateData.Dialog.prototype.onModelChangeParamOrder = function ( paramOrderArray ) {
	var i,
		items = [];

	this.paramOrderWidget.clearItems();
	for ( i = 0; i < paramOrderArray.length; i++ ) {
		items.push(
			new mw.TemplateData.DragDropItemWidget( {
				$: this.$,
				data: paramOrderArray[i],
				label: paramOrderArray[i]
			} )
		);
	}
	this.paramOrderWidget.addItems( items );

	// Refresh the parameter widget
	this.repopulateParamSelectWidget();
};

/**
 * Respond to an addition of a key to the model paramOrder
 * @param {string} key Added key
 */
mw.TemplateData.Dialog.prototype.onModelAddKeyParamOrder = function ( key ) {
	var dragItem = new mw.TemplateData.DragDropItemWidget( {
		$: this.$,
		data: key,
		label: key
	} );

	this.paramOrderWidget.addItems( [ dragItem ] );
};

mw.TemplateData.Dialog.prototype.onParamOrderWidgetReorder = function ( item, newIndex ) {
	this.model.reorderParamOrderKey( item.getData(), newIndex );
};

/**
 * Respond to description input change event
 */
mw.TemplateData.Dialog.prototype.onDescriptionInputChange = function ( value ) {
	if ( this.model.getTemplateDescription() !== value ) {
		this.model.setTemplateDescription( value, this.language );
	}
};

/**
 * Respond to add language button click
 */
mw.TemplateData.Dialog.prototype.onLanguagePanelButton = function () {
	this.switchPanels( 'language' );
};

/**
 * Respond to language select widget choose event
 * @param {OO.ui.OptionWidget} item Chosen item
 */
mw.TemplateData.Dialog.prototype.onLanguageDropdownWidgetChoose = function ( item ) {
	var language = item ? item.getData() : this.language;

	// Change current language
	if ( language !== this.language ) {
		this.language = language;

		// Update description label
		this.templateDescriptionFieldset.setLabel( mw.msg( 'templatedata-modal-title-templatedesc', this.language ) );

		// Update description value
		this.descriptionInput.setValue( this.model.getTemplateDescription( language ) );

		// Update all param descriptions in the param select widget
		this.repopulateParamSelectWidget();

		// Update the parameter detail page
		this.updateParamDetailsLanguage( this.language );

		this.emit( 'change-language', this.language );
	}
};

/**
 * Respond to add language button
 * @param {Object} data Data from the selected option widget
 */
mw.TemplateData.Dialog.prototype.newLanguageSearchWidgetSelect = function ( data ) {
	var languageButton,
		newLanguage = data.code;

	if ( newLanguage ) {
		if ( $.inArray( newLanguage, this.availableLanguages ) === -1 ) {
			// Add new language
			this.availableLanguages.push( newLanguage );
			languageButton = new OO.ui.OptionWidget( {
				data: newLanguage,
				$: this.$,
				label: $.uls.data.getAutonym( newLanguage )
			} );
			this.languageDropdownWidget.getMenu().addItems( [ languageButton ] );
		}

		// Select the new item
		this.languageDropdownWidget.getMenu().chooseItem(
			this.languageDropdownWidget.getMenu().getItemFromData( newLanguage )
		);
	}

	// Go to the main panel
	this.switchPanels( 'listParams' );
};

/**
 * Respond to add parameter button
 */
mw.TemplateData.Dialog.prototype.onAddParamButtonClick = function () {
	var newParamKey = this.newParamInput.getValue(),
		allProps = mw.TemplateData.Model.static.getAllProperties( true );

	// Validate parameter
	if ( !newParamKey.match( allProps.name.restrict ) ) {
		if ( this.model.isParamDeleted( newParamKey ) ) {
			// Empty param
			this.model.emptyParamData( newParamKey );
		} else if ( !this.model.isParamExists( newParamKey ) ) {
			// Add to model
			if ( this.model.addParam( newParamKey ) ) {
				// Add parameter to list
				this.addParamToSelectWidget( newParamKey );
			}
		}
	}
	// Reset the input
	this.newParamInput.setValue( '' );

	// Go back to list
	this.switchPanels( 'listParams' );
};

/**
 * Respond to choose event from the param select widget
 * @param {OO.ui.OptionWidget} item Parameter item
 */
mw.TemplateData.Dialog.prototype.onParamSelectWidgetChoose = function ( item ) {
	var paramKey = item.getData();

	if ( paramKey === 'tdg-importParameters' ) {
		// Import
		this.importParametersFromTemplateCode();
	} else {
		this.selectedParamKey = paramKey;

		// Fill in parameter detail
		this.getParameterDetails( paramKey );
		this.switchPanels( 'editParam' );
	}
};

mw.TemplateData.Dialog.prototype.onParamPropertyInputChange = function ( property, value ) {
	var err = false,
		anyInputError = false,
		allProps = mw.TemplateData.Model.static.getAllProperties( true );

	if ( property === 'type' ) {
		value = this.propInputs[property].getMenu().getSelectedItem() ? this.propInputs[property].getMenu().getSelectedItem().getData() : 'undefined';
	}

	// TODO: Validate the name
	if ( allProps[property].restrict ) {
		if ( value.match( allProps[property].restrict ) ) {
			// Error! Don't fix the model
			err = true;
			this.toggleNoticeMessage( 'edit', true, 'error', mw.msg( 'templatedata-modal-errormsg', '|', '=', '}}' ) );
		} else {
			this.toggleNoticeMessage( 'edit', false );
		}
	}

	this.propInputs[property].$element.toggleClass( 'tdg-editscreen-input-error', err );

	// Validate
	$( '.tdg-TemplateDataDialog-paramInput' ).each( function () {
		if ( $( this ).hasClass( 'tdg-editscreen-input-error' ) ) {
			anyInputError = true;
		}
	} );
	// Disable the 'back' button if there are any errors in the inputs
	this.actions.setAbilities( { back: !anyInputError } );
	if ( !err ) {
		this.model.setParamProperty( this.selectedParamKey, property, value, this.language );
	}
};

/**
 * Set the parameter details in the detail panel.
 * @param {Object} paramKey Parameter details
 */
mw.TemplateData.Dialog.prototype.getParameterDetails = function ( paramKey ) {
	var prop,
		paramData = this.model.getParamData( paramKey );

	for ( prop in this.propInputs ) {
		this.changeParamPropertyInput( paramKey, prop, paramData[prop], this.language );
	}
};

/**
 * Reset contents on reload
 */
mw.TemplateData.Dialog.prototype.reset = function () {
	this.language = null;
	this.availableLanguages = [];
	if ( this.paramSelectWidget ) {
		this.paramSelectWidget.clearItems();
		this.selectedParamKey = '';
	}

	if ( this.languageDropdownWidget ) {
		this.languageDropdownWidget.getMenu().clearItems();
	}

	if ( this.paramOrderWidget ) {
		this.paramOrderWidget.clearItems();
	}
};

/**
 * Empty and repopulate the parameter select widget.
 */
mw.TemplateData.Dialog.prototype.repopulateParamSelectWidget = function () {
	var i, paramKey,
		missingParams = this.model.getMissingParams(),
		paramList = this.model.getParams(),
		paramOrder = this.model.getTemplateParamOrder();

	this.paramSelectWidget.clearItems();

	// Update all param descriptions in the param select widget
	for ( i in paramOrder ) {
		paramKey = paramList[paramOrder[i]];
		if ( paramKey && !paramKey.deleted ) {
			this.addParamToSelectWidget( paramOrder[i] );
		}
	}

	// Check if there are potential parameters to add
	// from the template source code
	if ( missingParams.length > 0 ) {
		// Add a final option
		this.paramSelectWidget.addItems( [
			new mw.TemplateData.OptionImportWidget( {
				data: 'tdg-importParameters',
				$: this.$,
				params: missingParams
			} )
		] );
	}
};

/**
 * Change parameter property
 * @param {string} paramKey Parameter key
 * @param {string} propName Property name
 * @param {string} propVal Property value
 * @param {string} [lang] Language
 */
mw.TemplateData.Dialog.prototype.changeParamPropertyInput = function ( paramKey, propName, value, lang ) {
	var languageProps = mw.TemplateData.Model.static.getPropertiesWithLanguage(),
		allProps = mw.TemplateData.Model.static.getAllProperties( true ),
		prop = allProps[propName],
		propInput = typeof this.propInputs[propName].getMenu === 'function' ?
			this.propInputs[propName].getMenu() : this.propInputs[propName];

	lang = lang || this.language;

	if ( value !== undefined ) {
		// Change the actual input
		if ( prop.type === 'select' ) {
			propInput.selectItem( propInput.getItemFromData( value ) );
		} else if ( prop.type === 'boolean' ) {
				propInput.setValue( !!value );
		} else {
			if ( $.inArray( propName, languageProps ) !== -1 ) {
				propInput.setValue( value[lang] );
			} else {
				if ( prop.type === 'array' && $.type( value ) === 'array' ) {
					value = value.join( prop.delimiter );
				}
				propInput.setValue( value );
			}
		}
	} else {
		// Empty the input
		if ( prop.type === 'select' ) {
			propInput.selectItem( propInput.getItemFromData( prop['default'] ) );
		} else {
			propInput.setValue( '' );
		}
	}
};

/**
 * Add parameter to the list
 * @param {string} paramKey Parameter key in the model
 * @param {Object} paramData Parameter data
 */
mw.TemplateData.Dialog.prototype.addParamToSelectWidget = function ( paramKey ) {
	var paramItem,
		data = this.model.getParamData( paramKey );

	paramItem = new mw.TemplateData.OptionWidget( {
		data: {
			key: paramKey,
			name: data.name,
			aliases: data.aliases,
			description: this.model.getParamDescription( paramKey, this.language )
		},
		$: this.$
	} );

	this.paramSelectWidget.addItems( [ paramItem ] );
};

/**
 * Create the information page about individual parameters
 * @returns {jQuery} Editable details page for the parameter
 */
mw.TemplateData.Dialog.prototype.createParamDetails = function () {
	var props, type, propInput, config, paramProperties,
		paramFieldset,
		typeItemArray = [];

	paramProperties = mw.TemplateData.Model.static.getAllProperties( true );

	// Fieldset
	paramFieldset = new OO.ui.FieldsetLayout( {
		$: this.$
	} );

	for ( props in paramProperties ) {
		config = {
			$: this.$,
			multiline: paramProperties[props].multiline
		};
		if ( paramProperties[props].multiline ) {
			config.autosize = true;
		}
		// Create the property inputs
		switch ( props ) {
			case 'type':
				propInput = new OO.ui.DropdownWidget( config );
				for ( type in paramProperties[props].children ) {
					typeItemArray.push( new OO.ui.OptionWidget( {
						data: paramProperties[props].children[type],
						$: this.$,
						label: mw.msg( 'templatedata-modal-table-param-type-' + paramProperties[props].children[type] )
					} ) );
				}
				propInput.getMenu().addItems( typeItemArray );
				break;
			case 'deprecated':
			case 'required':
			case 'suggested':
				propInput = new OO.ui.ToggleSwitchWidget( config );
				break;
			default:
				propInput = new OO.ui.TextInputWidget( config );
				break;
		}

		this.propInputs[props] = propInput;

		propInput.$element
			.addClass( 'tdg-TemplateDataDialog-paramInput tdg-TemplateDataDialog-paramList-' + props );

		this.propFieldLayout[props] = new OO.ui.FieldLayout( propInput, {
			align: 'left',
			label: mw.msg( 'templatedata-modal-table-param-' + props )
		} );
		// Event
		if ( props === 'type' ) {
			propInput.getMenu().connect( this, { choose: [ 'onParamPropertyInputChange', props ] } );
		} else {
			propInput.connect( this, { change: [ 'onParamPropertyInputChange', props ] } );
		}
		// Append to parameter section
		paramFieldset.$element.append( this.propFieldLayout[props].$element );
	}
	// Update parameter property fields with languages
	this.updateParamDetailsLanguage( this.language );
	return paramFieldset.$element;
};

/**
 * Update the labels for parameter property inputs that include language, so
 * they show the currently used language.
 * @param {string} [lang] Language. If not used, will use currently defined
 *  language.
 */
mw.TemplateData.Dialog.prototype.updateParamDetailsLanguage = function ( lang ) {
	var i, prop, label,
		languageProps = mw.TemplateData.Model.static.getPropertiesWithLanguage();
	lang = lang || this.language;

	for ( i = 0; i < languageProps.length; i++ ) {
		prop = languageProps[i];
		label = mw.msg( 'templatedata-modal-table-param-' + prop, lang );
		this.propFieldLayout[prop].setLabel( label );
	}
};

/**
 * Override getBodyHeight to create a tall dialog relative to the screen.
 * @return {number} Body height
 */
mw.TemplateData.Dialog.prototype.getBodyHeight = function () {
	return window.innerHeight - 200;
};

/**
 * Show or hide the notice message in the dialog with a set message.
 * @param {string} type Which notice label to show: 'list' or 'global'
 * @param {Boolean} isShowing Show or hide the message
 * @param {string} status Message status 'error' or 'success'
 * @param {string|string[]} noticeMessage The message to display
 */
mw.TemplateData.Dialog.prototype.toggleNoticeMessage = function ( type, isShowing, status, noticeMessage ) {
	var noticeReference,
		$message;

	type = type || 'list';

	// Hide all
	this.noticeLabel.$element.hide();
	this.paramEditNoticeLabel.$element.hide();
	this.paramListNoticeLabel.$element.hide();

	if ( noticeMessage ) {
		// See which error to display
		if ( type === 'global' ) {
			noticeReference = this.noticeLabel;
		} else if ( type === 'edit' ) {
			noticeReference = this.paramEditNoticeLabel;
		} else {
			noticeReference = this.paramListNoticeLabel;
		}
		isShowing = isShowing || !noticeReference.$element.is( ':visible' );

		if ( $.type( noticeMessage ) === 'array' ) {
			$message = $( '<div>' );
			$.each( noticeMessage, function ( i, msg ) {
				$message.append( $( '<p>' ).text( msg ) );
			} );
			noticeReference.setLabel( $message );
		} else {
			noticeReference.setLabel( noticeMessage );
		}
		noticeReference.$element
			.toggle( isShowing )
			.toggleClass( 'errorbox', status === 'error' )
			.toggleClass( 'successbox', status === 'success' );
	}
};

/**
 * Import parameters from the source code.
 */
mw.TemplateData.Dialog.prototype.importParametersFromTemplateCode = function () {
	var combinedMessage = [],
		state = 'success',
		response = this.model.importSourceCodeParameters();
	// Repopulate the list
	this.repopulateParamSelectWidget();

	if ( response.existing.length > 0 ) {
		combinedMessage.push( mw.msg( 'templatedata-modal-errormsg-import-paramsalreadyexist', response.existing.join( mw.msg( 'comma-separator' ) ) ) );
	}

	if ( response.imported.length === 0 ) {
		combinedMessage.push( mw.msg( 'templatedata-modal-errormsg-import-noparams' ) );
		state = 'error';
	} else {
		combinedMessage.push( mw.msg( 'templatedata-modal-notice-import-numparams', response.imported.length, response.imported.join( mw.msg( 'comma-separator' ) ) ) );
	}

	this.toggleNoticeMessage( 'list', true, state, combinedMessage );
};

/**
 * @inheritDoc
 */
mw.TemplateData.Dialog.prototype.getSetupProcess = function ( data ) {
	return mw.TemplateData.Dialog.super.prototype.getSetupProcess.call( this, data )
		.next( function () {
			this.reset();
			// Hide the panels and display a spinner
			this.$spinner.show();
			this.panels.$element.hide();
			this.toggleNoticeMessage( 'global', false );
			this.toggleNoticeMessage( 'list', false );

			// Start with parameter list
			this.switchPanels( 'listParams' );
			this.model = new mw.TemplateData.Model( data.config );

			// Events
			this.model.connect( this, {
				'change-description': 'onModelChangeDescription',
				'change-paramOrder': 'onModelChangeParamOrder',
				'add-paramOrder': 'onModelAddKeyParamOrder'
			} );

			// Load the model according to the string
			this.model.loadModel( data.wikitext )
				.done( $.proxy( function () {
					var i,
						language = this.model.getDefaultLanguage(),
						languageItems = [],
						languages = this.model.getExistingLanguageCodes();

					this.setupDetailsFromModel();

					// Fill up the language selection
					if (
						languages.length === 0 ||
						$.inArray( language, languages ) === -1
					) {
						// Add the default language
						languageItems.push( new OO.ui.OptionWidget( {
							data: language,
							$: this.$,
							label: $.uls.data.getAutonym( language )
						} ) );
						this.availableLanguages.push( language );
					}

					// Add all available languages
					for ( i = 0; i < languages.length; i++ ) {
						languageItems.push( new OO.ui.OptionWidget( {
							data: languages[i],
							$: this.$,
							label: $.uls.data.getAutonym( languages[i] )
						} ) );
						// Store available languages
						this.availableLanguages.push( languages[i] );
					}
					this.languageDropdownWidget.getMenu().addItems( languageItems );
					// Trigger the initial language choice
					this.languageDropdownWidget.getMenu().chooseItem( this.languageDropdownWidget.getMenu().getItemFromData( language ) );

					// Show the panel
					this.$spinner.hide();
					this.panels.$element.show();
				}, this ) )
				.fail( $.proxy( function () {
					// Show error
					this.actions.setMode( 'error' );
					this.$spinner.hide();
					this.toggleNoticeMessage( 'global', true, 'error', mw.msg( 'templatedata-errormsg-jsonbadformat' ) );
				}, this ) );

		}, this );
};

/**
 * Set up the list of parameters from the model. This should happen
 * after initialization of the model.
 */
mw.TemplateData.Dialog.prototype.setupDetailsFromModel = function () {
	// Set up description
	this.descriptionInput.setValue( this.model.getTemplateDescription( this.language ) );
	// Repopulate the parameter list
	this.repopulateParamSelectWidget();
};

/**
 * Switch between stack layout panels
 * @param {string} panel Panel key to switch to
 */
mw.TemplateData.Dialog.prototype.switchPanels = function ( panel ) {
	switch ( panel ) {
		case 'listParams':
			this.actions.setMode( 'list' );
			this.panels.setItem( this.listParamsPanel );
			// Reset message
			this.toggleNoticeMessage( 'list', false );
			// Deselect parameter
			this.paramSelectWidget.selectItem( null );
			// Repopulate the list to account for any changes
			if ( this.model ) {
				this.repopulateParamSelectWidget();
			}
			// Hide/show panels
			this.listParamsPanel.$element.show();
			this.editParamPanel.$element.hide();
			this.addParamPanel.$element.hide();
			this.languagePanel.$element.hide();
			break;
		case 'editParam':
			this.actions.setMode( 'edit' );
			this.panels.setItem( this.editParamPanel );
			// Deselect parameter
			this.paramSelectWidget.selectItem( null );
			// Hide/show panels
			this.listParamsPanel.$element.hide();
			this.languagePanel.$element.hide();
			this.addParamPanel.$element.hide();
			this.editParamPanel.$element.show();
			break;
		case 'addParam':
			this.actions.setMode( 'add' );
			this.panels.setItem( this.addParamPanel );
			// Hide/show panels
			this.listParamsPanel.$element.hide();
			this.editParamPanel.$element.hide();
			this.languagePanel.$element.hide();
			this.addParamPanel.$element.show();
			break;
		case 'language':
			this.actions.setMode( 'language' );
			this.panels.setItem( this.languagePanel );
			// Hide/show panels
			this.listParamsPanel.$element.hide();
			this.editParamPanel.$element.hide();
			this.addParamPanel.$element.hide();
			this.languagePanel.$element.show();
			break;
	}
};

/**
 * @inheritDoc
 */
mw.TemplateData.Dialog.prototype.getActionProcess = function ( action ) {
	if ( action === 'back' ) {
		return new OO.ui.Process( function () {
			this.switchPanels( 'listParams' );
		}, this );
	}
	if ( action === 'add' ) {
		return new OO.ui.Process( function () {
			this.switchPanels( 'addParam' );
		}, this );
	}
	if ( action === 'delete' ) {
		return new OO.ui.Process( function () {
			this.model.deleteParam( this.selectedParamKey );
			this.switchPanels( 'listParams' );
		}, this );
	}
	if ( action === 'apply' ) {
		return new OO.ui.Process( function () {
			this.emit( 'apply', this.model.outputTemplateDataString() );
			this.close( { action: action } );
		}, this );
	}
	// Fallback to parent handler
	return mw.TemplateData.Dialog.super.prototype.getActionProcess.call( this, action );
};