/**
 * Created by Daniel on 21.07.15.
 */

CmdSetMaterial = function ( object, newMaterial ) {

	Cmd.call( this );

	this.type = 'CmdSetMaterial';

	this.object = object;
	this.objectUuid = object !== undefined ? object.uuid : undefined;

	this.oldMaterial = object !== undefined ? object.material : undefined;
	this.newMaterial = newMaterial;

	this.oldMaterialJSON = serializeMaterial( this.oldMaterial );
	this.newMaterialJSON = serializeMaterial( this.newMaterial );


	function serializeMaterial ( material ) {

		if ( material === undefined ) return null;

		var meta = {
			geometries: {},
			materials: {},
			textures: {},
			images: {}
		};

		var json = {};
		json.materials = [ material.toJSON( meta ) ];

		var textures = extractFromCache( meta.textures );
		var images = extractFromCache( meta.images );

		if ( textures.length > 0 ) json.textures = textures;
		if ( images.length > 0 ) json.images = images;

		return json;

	}

	// Note: The function 'extractFromCache' is copied from Object3D.toJSON()

	// extract data from the cache hash
	// remove metadata on each item
	// and return as array
	function extractFromCache ( cache ) {

		var values = [];
		for ( var key in cache ) {

			var data = cache[ key ];
			delete data.metadata;
			values.push( data );

		}
		return values;

	}

};

CmdSetMaterial.prototype = {

	execute: function () {

		this.object.material = this.newMaterial;
		this.editor.signals.materialChanged.dispatch( this.newMaterial );

	},

	undo: function () {

		this.object.material = this.oldMaterial;
		this.editor.signals.materialChanged.dispatch( this.oldMaterial );

	},

	toJSON: function () {

		var output = Cmd.prototype.toJSON.call( this );

		output.objectUuid = this.objectUuid;
		output.oldMaterial = this.oldMaterialJSON;
		output.newMaterial = this.newMaterialJSON;

		return output;

	},

	fromJSON: function ( json ) {

		Cmd.prototype.fromJSON.call( this, json );

		this.object = this.editor.objectByUuid( json.objectUuid );
		this.objectUuid = json.objectUuid;

		this.oldMaterialJSON = json.oldMaterial;
		this.newMaterialJSON = json.newMaterial;

		this.oldMaterial = parseMaterial( json.oldMaterial );
		this.newMaterial = parseMaterial( json.newMaterial );


		function parseMaterial ( json ) {

			var loader = new THREE.ObjectLoader();
			var images = loader.parseImages( json.images );
			var textures  = loader.parseTextures( json.textures, images );
			var materials = loader.parseMaterials( json.materials, textures );
			return materials[ json.materials[ 0 ].uuid ];

		}
	}

};