/**
 * A widget that represents a template parameter, with a checkbox to add/remove the parameter.
 * Modelled after {@see OO.ui.OutlineOptionWidget}. Also see {@see OO.ui.CheckboxMultioptionWidget}
 * for inspiration.
 *
 * @class
 * @extends OO.ui.OptionWidget
 *
 * @constructor
 * @param {Object} config
 * @param {string} config.data Parameter name
 * @param {string} config.label
 * @param {boolean} [config.required=false] Required parameters can't be unchecked
 * @param {boolean} [config.selected=false] If the parameter is currently used (checked)
 * @param {boolean} [config.hasValue=false] If the parameter has a value that's not empty
 */
ve.ui.MWTransclusionOutlineParameterWidget = function VeUiMWTransclusionOutlineParameterWidget( config ) {
	this.checkbox = new OO.ui.CheckboxInputWidget( {
		title: config.required ?
			ve.msg( 'visualeditor-dialog-transclusion-required-parameter' ) :
			null,
		disabled: config.required,
		selected: config.selected || config.required,
		// Keyboard navigation is handled by the outer OO.ui.SelectWidget
		tabIndex: -1
	} )
		.connect( this, {
			// The array syntax is a way to call `this.emit( 'change' )`.
			change: [ 'emit', 'change' ]
		} );
	this.checkbox.$input.on( {
		mousedown: this.onMouseDown.bind( this )
	} );

	// Parent constructor
	ve.ui.MWTransclusionOutlineParameterWidget.super.call( this, ve.extendObject( config, {
		classes: [ 've-ui-mwTransclusionOutlineParameterWidget' ],
		$label: $( '<label>' )
	} ) );

	this.toggleHasValue( config.hasValue );

	// Initialization
	this.$element
		.append( this.checkbox.$element, this.$label );
};

/* Inheritance */

OO.inheritClass( ve.ui.MWTransclusionOutlineParameterWidget, OO.ui.OptionWidget );

/* Methods */

/**
 * @private
 * @param {jQuery.Event} e
 */
ve.ui.MWTransclusionOutlineParameterWidget.prototype.onMouseDown = function ( e ) {
	// Mouse clicks conflict with the click handler in {@see OO.ui.SelectWidget}
	e.stopPropagation();
};

/**
 * @inheritDoc OO.ui.OptionWidget
 */
ve.ui.MWTransclusionOutlineParameterWidget.prototype.setSelected = function ( state ) {
	// Never uncheck a required parameter
	state = state || this.checkbox.isDisabled();

	this.checkbox.setSelected( state, true );
	return ve.ui.MWTransclusionOutlineParameterWidget.super.prototype.setSelected.call( this, state );
};

/**
 * @param {boolean} state
 */
ve.ui.MWTransclusionOutlineParameterWidget.prototype.toggleActivePageIndicator = function ( state ) {
	this.$element.toggleClass( 've-ui-mwTransclusionOutlineParameterWidget-activePage', state );
};

/**
 * @param {boolean} hasValue
 */
ve.ui.MWTransclusionOutlineParameterWidget.prototype.toggleHasValue = function ( hasValue ) {
	this.$element.toggleClass( 've-ui-mwTransclusionOutlineParameterWidget-hasValue', hasValue );
};

/**
 * Custom method to scroll parameter into view respecting the sticky part that sits above
 *
 * @param {number} paddingTop
 */
ve.ui.MWTransclusionOutlineParameterWidget.prototype.ensureVisibility = function ( paddingTop ) {
	// make sure parameter is visible and scrolled underneath the sticky
	this.scrollElementIntoView( { animate: false, padding: { top: paddingTop } } );
};