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use crate::{
    api::{ErrorApi, ManagedTypeApi},
    signal_arg_de_error, ArgId, DynArgInput,
};
use elrond_codec::*;

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

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

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

#[inline(always)]
fn dyn_load_exit<EA>(ctx: (EA, ArgId), de_err: DecodeError) -> !
where
    EA: ErrorApi + ManagedTypeApi,
{
    let (api, arg_id) = ctx;
    signal_arg_de_error(api, arg_id, de_err)
}