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use crate::api::ErrorApi;
use crate::types::*;
use elrond_codec::{TopEncode, TopEncodeOutput};

pub fn serialize_contract_call_arg<I, A>(arg: I, arg_buffer: &mut ArgBuffer, error_api: A)
where
	I: ContractCallArg,
	A: ErrorApi,
{
	// TODO: convert to fast exit
	if let Result::Err(sc_err) = arg.push_async_arg(arg_buffer) {
		error_api.signal_error(sc_err.as_bytes());
	}
}

/// Trait that specifies how arguments are serialized in contract calls.
///
/// TODO: unite with DynArg trait when reorganizing argument handling.
pub trait ContractCallArg: Sized {
	fn push_async_arg(&self, serializer: &mut ArgBuffer) -> Result<(), SCError>;
}

/// Local adapter the connects the ArgBuffer to the TopEncode trait.
struct ContractCallArgOutput<'s> {
	arg_buffer: &'s mut ArgBuffer,
}

impl<'c> ContractCallArgOutput<'c> {
	#[inline]
	fn new(arg_buffer: &'c mut ArgBuffer) -> Self {
		ContractCallArgOutput { arg_buffer }
	}
}

impl<'c> TopEncodeOutput for ContractCallArgOutput<'c> {
	fn set_slice_u8(self, bytes: &[u8]) {
		self.arg_buffer.push_argument_bytes(bytes);
	}
}

impl<T> ContractCallArg for T
where
	T: TopEncode,
{
	#[inline]
	#[allow(clippy::redundant_closure)]
	fn push_async_arg(&self, serializer: &mut ArgBuffer) -> Result<(), SCError> {
		self.top_encode(ContractCallArgOutput::new(serializer))
			.map_err(|err| SCError::from(err))
	}
}