#pypp 0
#include <iris.hh>
#include <devices.hh>

template <unsigned I, unsigned O> //
class UI:
	struct in_base:
		UI <I, O> *ui
		unsigned my_index
		void (*handle) (in_base *self, void (*cb)(unsigned))
		void (*send) (in_base *self, Iris::Cap c)
		in_base () : ui (NULL), my_index (0), handle (NULL), send (NULL):
	struct out_base:
		UI <I, O> *ui
		unsigned my_index
		void (*send) (out_base *self, Iris::Cap c)
		out_base () : ui (NULL), my_index (0), send (NULL):

	public:

	void init (Iris::Cap my_cap):
		Iris::my_parent.provide_capability <Iris::UI> (my_cap)
	template <typename _T> //
	class in : public in_base:
		friend class UI <I, O>
		_T my_data
		static void send_impl (in_base *self, Iris::Cap c):
			c.invoke (self->my_index | Iris::UI::INPUT, reinterpret_cast <in <_T> *> (self)->my_data)
		static void handle_impl (in_base *self, void (*cb)(unsigned)):
			in *me = reinterpret_cast <in *> (self)
			if me->my_data == Iris::recv.data[1].l:
				return
			me->my_data = Iris::recv.data[1].l
			cb (me->my_index)
		public:
		void init ():
			this->send = &send_impl
			this->handle = &handle_impl
		operator _T () const:
			return my_data
	class in_event : public in_base:
		friend class UI <I, O>
		static void send_impl (in_base *self, Iris::Cap c):
			c.invoke (self->my_index | Iris::UI::INPUT)
		static void handle_impl (in_base *self, void (*cb)(unsigned)):
			cb (self->my_index)
		public:
		void init ():
			this->send = &send_impl
			this->handle = &handle_impl
	template <typename _T> //
	class out : public out_base:
		friend class UI <I, O>
		_T my_data
		static void send_impl (out_base *self, Iris::Cap c):
			c.invoke (self->my_index, reinterpret_cast <out <_T> *> (self)->my_data)
		public:
		void init ():
			this->send = &send_impl
		out <_T> &operator= (_T const &t):
			if !this->ui || my_data == t:
				return *this
			my_data = t
			send_impl (this, this->ui->cap)
			return *this
		operator _T () const:
			return my_data
	class out_event : public out_base:
		friend class UI <I, O>
		public:
		static void send_impl (out_base *self, Iris::Cap c):
			// Don't send an event.  This is only for listing the state.
		void operator() ():
			if !this->ui:
				return
			this->ui->cap.invoke (this->my_index)
		void init ():
			this->send = &send_impl
	void add_in (in_base *obj, unsigned code):
		ins[code] = obj
		obj->ui = this
		obj->my_index = code
	void add_out (out_base *obj, unsigned code):
		outs[code] = obj
		obj->ui = this
		obj->my_index = code
	bool event (void (*cb)(unsigned)):
		switch Iris::recv.data[0].l:
			case Iris::UI::EXIT:
				Iris::recv.reply.invoke ()
				return false
			case Iris::UI::GET_STATE:
				if cap.code != CAP_NONE:
					Iris::free_cap (cap)
				cap = Iris::get_arg ()
				Iris::recv.reply.invoke ()
				for unsigned i = 0; i < I; ++i:
					ins[i]->send (ins[i], cap)
				for unsigned i = 0; i < O; ++i:
					outs[i]->send (outs[i], cap)
				break
			case Iris::UI::EVENT:
				Iris::Cap r = Iris::get_reply ()
				if Iris::recv.data[0].h >= I:
					Iris::panic (Iris::recv.data[0].h, "invalid input requested by ui")
				ins[Iris::recv.data[0].h]->handle (ins[Iris::recv.data[0].h], cb)
				r.invoke ()
				Iris::free_cap (r)
				break
			default:
				Iris::panic (Iris::recv.data[0].l, "invalid request for ui")
		return true
	private:
	in_base *ins[I]
	out_base *outs[O]
	Iris::Cap cap