entities = {}

-- Bace component class of the ECS
class Component
	depends: {}
	new: (name, properties) =>
		@name = name
		@properties = properties or {}
	join: (e) =>
		@
	leave: (e) =>
		@

-- Base entity of our ECS
class Entity
	id: 1
	new: (id, components) => -- [id], [components]
		id_cur = #entities
		while id == nil
			id_cur += 1
			if entities[id_cur] == nil
				id = id_cur
		assert(entities[id] == nil, "Attempted to create entity with the same id as one that already exists: " .. tostring(id))
		entities[id] = @
		@id = id
		-- Bookkeeping for O(1) access for componenets
		@c_by_type = {}

		--Entity is responsible for the component -> entity link
		@components = componenets or {}
		for name, component in pairs(components)
			component.entity = @
			@c_by_type[component.__class] = @c_by_type[component.__class] or {}
			@c_by_type[component.__class][name] = component
			component\join(@)
	add: (cid, component) =>
		component.entity = @
		component\join(@)
		if cid == nil
			cid = #@components
			while @components[cid]
				cid += 1
		assert(@components[cid] == nil, "Already had a component with id" .. tostring(cid))
		@components[cid] = component
		@
	remove: (cid) =>
		component = @components[cid]
		component.entity = nil
		component\leave(@)
		component
	get: (cid) =>
		@components[cid]

class NetworkedComponent extends Component
	pack: () =>
		assert(@entity, "Tried to pack on a NetworkedComponent without an Entity")
		return am.to_json({
			id: @entity.id
			data: @properties
			time: am.current_time!
		})

class PredictedComponent extends Component
	new: (name, properties, netc_name, calculate) =>
		super(name, properties)
		@netc_name = netc_name
		@calculate = calculate
	join: (entity) =>
		@net = entity[@netc_name]
	forward: () =>
		for proeprty, calculation in pairs(@calculate)
			@properties[property] = calculation(@)

class GraphicsComponent extends Component
	new: (name, properties) =>
		assert(properties.node , "Failed to find node for graphics component")
		super(name, properties)

{
	Component: Component
	Entity: Entity
	NetworkedComponent: NetworkedComponent
	PredictedComponent: PredictedComponent
	GraphicsComponent: GraphicsComponent
}

}