var Sculpture = new function(){
	
	var base = this;

	base.list = {}
	base.nextMedia = null
	
	base.mouse = new mouse ({ use_offset: false, mousedownUsesCapture: true })
	
	base.init = function(){
	}

	base.add = function(opt){
		var scene_media
		switch (opt.media.type) {
			case 'image':
				scene_media = new Sculpture.types.image (opt)
				break
		}
		base.list[scene_media.id] = scene_media
		return scene_media
	}
	
	base.addNextToWall = function(opt){
	  opt.newMedia = true
		opt.media = base.nextMedia
		opt.index = opt.index || 0
		var scene_media = base.add(opt)
		
		// test if scenery was placed here
		if (! scene_media) {
		  return null
		}
		else {
			base.nextMedia = null
			return scene_media
		}
	}

	base.find = function(id){
		return base.list[id] || null
	}
	
	base.remove = function(id){
		var scene_media = base.list[id]
		delete base.list[id]
		scene_media && scene_media.destroy()
	}
	
	base.removeAll = function(){
		base.forEach(function(scene_media){
			base.remove(scene_media.id)
		})
	}

	base.uid = new UidGenerator(base.list)
	
	base.forEach = function(f){
		return base.values().forEach(f)
	}
	
	base.map = function(f){
		return base.values().map(f)
	}
	
	base.values = function(){
		return _.values(base.list)
	}
	
	base.serialize = function(){
		var sculptures = base.map(function(sculpture){
			return sculpture.serialize()
		})
		return sculptures
	}

	base.deserialize = function(sculpture_data){
	  var added = []
		sculpture_data.forEach(function(data){
			var scene_media = base.add({
				id: data.id,
			  data: data,
				media: data.media,
			})
			added.push(scene_media)
		})
		return added
	}

	return base
}

Sculpture.types = {}