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use crate::*;
use elrond_codec::*;

/// Any type that is used as an endpoint argument must implement this trait.
pub trait DynArg<I, D>: Sized
where
	I: TopDecodeInput,
	D: DynArgInput<I>,
{
	fn dyn_load(loader: &mut D, arg_id: ArgId) -> Self;
}

/// Used for loading arguments annotated with `#[multi(...)]`.
pub trait DynArgMulti<I, D>: DynArg<I, D>
where
	I: TopDecodeInput,
	D: DynArgInput<I>,
{
	fn dyn_load_multi(loader: &mut D, arg_id: ArgId, num: usize) -> Self;
}

/// All top-deserializable types can be endpoint arguments.
impl<I, D, T> DynArg<I, D> for T
where
	I: TopDecodeInput,
	D: DynArgInput<I>,
	T: TopDecode,
{
	fn dyn_load(loader: &mut D, arg_id: ArgId) -> Self {
		if let TypeInfo::Unit = T::TYPE_INFO {
			// unit type returns without loading anything
			let cast_unit: T = unsafe { core::mem::transmute_copy(&()) };
			return cast_unit;
		}

		let arg_input = loader.next_arg_input();
		T::top_decode_or_exit(arg_input, &(&*loader, arg_id), dyn_load_exit)
	}
}

#[inline(always)]
fn dyn_load_exit<I, D>(ctx: &(&D, ArgId), de_err: DecodeError) -> !
where
	I: TopDecodeInput,
	D: DynArgInput<I>,
{
	let (loader, arg_id) = ctx;
	signal_arg_de_error(*loader, *arg_id, de_err)
}