exception Invalid_message of string

type msg =
	| Hello of string		(* nom du jeu *)
	| YourTurn of float		(* nombre secondes pour jouer *)
	| Play of string		(* description textuelle du coup *)
	| OK					(* coup accepté *)
	| YouWin
	| YouLose
	| Tie
	| Eliminated
	| FairEnough

let decode = function
	| "OK" -> OK
	| "You win" -> YouWin
	| "You lose" -> YouLose
	| "Tie" -> Tie
	| "Eliminated" -> Eliminated
	| "Fair enough" -> FairEnough
	| s when String.sub s 0 6 = "Hello " ->
		Hello (String.sub s 6 (String.length s - 6))
	| s when String.sub s 0 10 = "Your turn " ->
		YourTurn (float_of_string (String.sub s 10 (String.length s - 10)))
	| s when String.sub s 0 5 = "Play " ->
		Play (String.sub s 5 (String.length s - 5))
	| s -> raise (Invalid_message s)

let encode = function
	| Hello x -> "Hello " ^ x
	| YourTurn n -> "Your turn " ^ (string_of_float n)
	| Play x -> "Play " ^ x
	| OK -> "OK"
	| YouWin -> "You win"
	| YouLose -> "You lose"
	| Tie -> "Tie"
	| Eliminated -> "Eliminated"
	| FairEnough -> "Fair enough"