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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,
{
    // #[inline(never)]
    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;
    loader.signal_arg_de_error(*arg_id, de_err)
}