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use crate::*;
use dharitri_codec::*;

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

/// All top-deserializable types can be endpoint arguments.
impl<T> DynArg for T
where
    T: TopDecode,
{
    fn dyn_load<I, D>(loader: &mut D, arg_id: ArgId) -> Self
    where
        I: TopDecodeInput,
        D: DynArgInput<I>,
    {
        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)
}