/*!
 * VisualEditor UserInterface MWLiveExtensionInspector class.
 *
 * @copyright 2011-2014 VisualEditor Team and others; see AUTHORS.txt
 * @license The MIT License (MIT); see LICENSE.txt
 */

/**
 * MediaWiki live extension inspector.
 *
 * @class
 * @abstract
 * @extends ve.ui.MWExtensionInspector
 *
 * @constructor
 * @param {Object} [config] Configuration options
 */
ve.ui.MWLiveExtensionInspector = function VeUiMWLiveExtensionInspector( config ) {
	// Parent constructor
	ve.ui.MWExtensionInspector.call( this, config );

	// Late bind onChangeHanlder to a debounced updatePreview
	this.onChangeHandler = ve.debounce( ve.bind( this.updatePreview, this ), 250 );
};

/* Inheritance */

OO.inheritClass( ve.ui.MWLiveExtensionInspector, ve.ui.MWExtensionInspector );

/* Static properties */

/**
 * Name of extension in the mw data, if different from inspector name
 *
 * @static
 * @property {string}
 * @inheritable
 */
ve.ui.MWLiveExtensionInspector.static.mwName = null;

/* Methods */

/**
 * Create an MW data object for a new node
 * @returns {Object} MW data
 */
ve.ui.MWLiveExtensionInspector.prototype.getNewMwData = function () {
	return {
			'name': this.constructor.static.mwName || this.constructor.static.name,
			'attrs': {},
			'body': {
				'extsrc': ''
			}
		};
};

/**
 * @inheritdoc
 */
ve.ui.MWLiveExtensionInspector.prototype.setup = function ( data ) {
	// Parent method
	ve.ui.MWExtensionInspector.prototype.setup.call( this, data );

	// Initialization
	this.getFragment().getSurface().pushStaging();

	if ( !this.node ) {
		// Create a new node
		// collapseRangeToEnd returns a new fragment
		this.fragment = this.getFragment().collapseRangeToEnd().insertContent( [
			{
				'type': this.constructor.static.nodeModel.static.name,
				'attributes': { 'mw': this.getNewMwData() }
			},
			{ 'type': '/' + this.constructor.static.nodeModel.static.name }
		] );
		// Check if the node was inserted at a structural offset and wrapped in a paragraph
		if ( this.getFragment().getRange().getLength() === 4 ) {
			this.fragment = this.getFragment().adjustRange( 1, -1 );
		}
		this.getFragment().select();
		this.node = this.getFragment().getSelectedNode();
	}
	this.input.setValue( this.node.getAttribute( 'mw' ).body.extsrc );

	this.input.on( 'change', this.onChangeHandler );
};

/**
 * @inheritdoc
 */
ve.ui.MWLiveExtensionInspector.prototype.teardown = function ( data ) {
	this.input.off( 'change', this.onChangeHandler );

	this.getFragment().getSurface().applyStaging();

	// Parent method
	ve.ui.MWExtensionInspector.prototype.teardown.call( this, data );
};

/**
 * Update the node rendering to reflect the current content in the inspector.
 */
ve.ui.MWLiveExtensionInspector.prototype.updatePreview = function () {
	var mwData = ve.copy( this.node.getAttribute( 'mw' ) );

	mwData.body.extsrc = this.input.getValue();

	if ( this.visible ) {
		this.getFragment().changeAttributes( { 'mw': mwData } );
	}
};