import objc.runtime.*;

public import objc.runtime.(Id, SEL, Method, Protocol, BOOL, nil);

private selector(name) = sel_registerName(cstring(name));
Class(name) = objc_getClass(cstring(name));

// TODO: choose objc_msgSend form based on storage class of return value
msgSend(ReturnTypes, self: Id, _cmd: SEL, ...args)
    = CCodePointer[
        (Id, SEL, ...Type(...args)),
        ReturnTypes
    ](objc_msgSend)(self, _cmd, ...args);

record Selector[ReturnType, ...ArgTypes] {
    sel: SEL;
}

alias Void = static ();

overload Selector(name, ReturnType, ...ArgTypes)
    = Selector[ReturnType, ...ArgTypes](selector(name));

[ReturnType, ...ArgTypes]
overload call(
    sel: Selector[ReturnType, ...ArgTypes],
    self,
    ...args: ArgTypes
) = msgSend(ReturnType, self, sel.sel, ...args);