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use crate::api::{EndpointFinishApi, ErrorApi};
use crate::elrond_codec::{EncodeError, TopEncode, TopEncodeOutput};
use crate::Vec;

struct ApiOutputAdapter<FA>
where
	FA: EndpointFinishApi + Clone + 'static,
{
	api: FA,
}

impl<FA> ApiOutputAdapter<FA>
where
	FA: EndpointFinishApi + Clone + 'static,
{
	#[inline]
	fn new(api: FA) -> Self {
		ApiOutputAdapter { api }
	}
}

impl<FA> TopEncodeOutput for ApiOutputAdapter<FA>
where
	FA: EndpointFinishApi + Clone + '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);
	}
}

/// All types that are returned from endpoints need to implement this trait.
pub trait EndpointResult: Sized {
	/// Indicates how the result of the endpoint can be interpreted when called via proxy.
	/// `Self` for most types.
	type DecodeAs;

	fn finish<FA>(&self, api: FA)
	where
		FA: EndpointFinishApi + Clone + 'static;
}

/// All serializable objects can be used as smart contract function result.
impl<T> EndpointResult for T
where
	T: TopEncode,
{
	type DecodeAs = Self;

	fn finish<FA>(&self, api: FA)
	where
		FA: EndpointFinishApi + Clone + 'static,
	{
		self.top_encode_or_exit(ApiOutputAdapter::new(api.clone()), api, finish_exit);
	}
}

#[inline(always)]
fn finish_exit<FA>(api: FA, en_err: EncodeError) -> !
where
	FA: EndpointFinishApi + ErrorApi + 'static,
{
	api.signal_error(en_err.message_bytes())
}