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use crate::elrond_codec::*;
use crate::*;
use core::marker::PhantomData;

struct ApiOutput<A, BigInt, BigUint>
where
	BigUint: BigUintApi + 'static,
	BigInt: BigIntApi<BigUint> + 'static,
	A: ContractIOApi<BigInt, BigUint> + 'static,
{
	api: A,
	_phantom1: PhantomData<BigInt>,
	_phantom2: PhantomData<BigUint>,
}

impl<A, BigInt, BigUint> ApiOutput<A, BigInt, BigUint>
where
	BigUint: BigUintApi + 'static,
	BigInt: BigIntApi<BigUint> + 'static,
	A: ContractIOApi<BigInt, BigUint> + 'static,
{
	#[inline]
	fn new(api: A) -> Self {
		ApiOutput {
			api,
			_phantom1: PhantomData,
			_phantom2: PhantomData,
		}
	}
}

impl<A, BigInt, BigUint> TopEncodeOutput for ApiOutput<A, BigInt, BigUint>
where
	BigUint: BigUintApi + 'static,
	BigInt: BigIntApi<BigUint> + 'static,
	A: ContractIOApi<BigInt, BigUint> + 'static,
{
	fn set_slice_u8(self, bytes: &[u8]) {
		self.api.finish_slice_u8(bytes);
	}

	fn set_u64(self, value: u64) {
		self.api.finish_u64(value);
	}

	fn set_i64(self, value: i64) {
		self.api.finish_i64(value);
	}

	#[inline]
	fn set_unit(self) {
		// nothing: no result produced
	}

	#[inline]
	fn set_big_int_handle_or_bytes<F: FnOnce() -> Vec<u8>>(self, handle: i32, _else_bytes: F) {
		self.api.finish_big_int_raw(handle);
	}

	#[inline]
	fn set_big_uint_handle_or_bytes<F: FnOnce() -> Vec<u8>>(self, handle: i32, _else_bytes: F) {
		self.api.finish_big_uint_raw(handle);
	}
}

pub trait EndpointResult<A, BigInt, BigUint>: Sized
where
	BigUint: BigUintApi + 'static,
	BigInt: BigIntApi<BigUint> + 'static,
	A: ContractHookApi<BigInt, BigUint> + ContractIOApi<BigInt, BigUint> + 'static,
{
	fn finish(&self, api: A);
}

/// All serializable objects can be used as smart contract function result.
impl<A, BigInt, BigUint, T> EndpointResult<A, BigInt, BigUint> for T
where
	T: TopEncode,
	BigUint: BigUintApi + 'static,
	BigInt: BigIntApi<BigUint> + 'static,
	A: ContractHookApi<BigInt, BigUint> + ContractIOApi<BigInt, BigUint> + 'static,
{
	fn finish(&self, api: A) {
		self.top_encode_or_exit(ApiOutput::new(api.clone()), api.clone(), finish_exit);
	}
}

#[inline(always)]
fn finish_exit<A, BigInt, BigUint>(api: A, en_err: EncodeError) -> !
where
	BigUint: BigUintApi + 'static,
	BigInt: BigIntApi<BigUint> + 'static,
	A: ContractHookApi<BigInt, BigUint> + ContractIOApi<BigInt, BigUint> + 'static,
{
	api.signal_error(en_err.message_bytes())
}