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use crate::api::EndpointArgumentApi;
use crate::Box;
use dharitri_codec::TopDecodeInput;

/// Adapter from the API to the TopDecodeInput trait.
/// Allows objects to be deserialized directly from the API as arguments.
///
/// Of course the implementation provides shortcut deserialization computation paths directly from API:
/// into_u64, into_i64, ...
///
/// This is a performance-critical struct.
/// Since the wasm EndpointArgumentApi (ArwenApiImpl) is zero-size,
/// it means that this structures translates to a single glorified i32 in wasm.
pub struct ArgDecodeInput<AA>
where
	AA: EndpointArgumentApi + 'static,
{
	api: AA,
	arg_index: i32,
}

impl<AA> ArgDecodeInput<AA>
where
	AA: EndpointArgumentApi + 'static,
{
	#[inline]
	pub fn new(api: AA, arg_index: i32) -> Self {
		ArgDecodeInput { api, arg_index }
	}
}

impl<AA> TopDecodeInput for ArgDecodeInput<AA>
where
	AA: EndpointArgumentApi + 'static,
{
	fn byte_len(&self) -> usize {
		self.api.get_argument_len(self.arg_index)
	}

	fn into_boxed_slice_u8(self) -> Box<[u8]> {
		self.api.get_argument_boxed_bytes(self.arg_index).into_box()
	}

	fn into_u64(self) -> u64 {
		self.api.get_argument_u64(self.arg_index)
	}

	fn into_i64(self) -> i64 {
		self.api.get_argument_i64(self.arg_index)
	}

	#[inline]
	fn try_get_big_uint_handle(&self) -> (bool, i32) {
		(true, self.api.get_argument_big_uint_raw(self.arg_index))
	}

	#[inline]
	fn try_get_big_int_handle(&self) -> (bool, i32) {
		(true, self.api.get_argument_big_int_raw(self.arg_index))
	}
}