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use crate::abi::{TypeAbi, TypeDescriptionContainer};
use crate::io::{ArgId, ContractCallArg, DynArg, DynArgInput};
use crate::types::{ArgBuffer, SCError};
use crate::{api::EndpointFinishApi, EndpointResult};
use alloc::string::String;
use alloc::vec::Vec;
use core::iter::FromIterator;
use dharitri_codec::TopDecodeInput;

/// Structure that allows taking a variable number of arguments
/// or returning a variable number of results in a smart contract endpoint.
#[derive(Clone)]
pub struct MultiArgVec<T>(pub Vec<T>);

/// Used for taking a variable number of arguments in an endpoint,
/// it is synonymous with `MultiResultVec`/`MultiArgVec`.
pub type VarArgs<T> = MultiArgVec<T>;

/// Used for returning a variable number of results from an endpoint,
/// it is synonymous with `MultiResult`.
pub type MultiResultVec<T> = VarArgs<T>;

impl<T> From<Vec<T>> for MultiArgVec<T> {
	fn from(v: Vec<T>) -> Self {
		MultiArgVec(v)
	}
}

impl<T> MultiArgVec<T> {
	#[inline]
	pub fn new() -> Self {
		MultiArgVec(Vec::new())
	}
}

impl<T> Default for MultiArgVec<T> {
	#[inline]
	fn default() -> Self {
		Self::new()
	}
}

impl<T> MultiArgVec<T> {
	#[inline]
	pub fn into_vec(self) -> Vec<T> {
		self.0
	}

	#[inline]
	pub fn as_slice(&self) -> &[T] {
		self.0.as_slice()
	}

	#[inline]
	pub fn push(&mut self, value: T) {
		self.0.push(value);
	}

	#[inline]
	pub fn len(&self) -> usize {
		self.0.len()
	}

	#[inline]
	pub fn is_empty(&self) -> bool {
		self.0.is_empty()
	}

	#[inline]
	pub fn iter(&self) -> core::slice::Iter<'_, T> {
		self.0.iter()
	}
}

impl<T> FromIterator<T> for MultiArgVec<T> {
	fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
		let v = Vec::<T>::from_iter(iter);
		MultiArgVec(v)
	}
}

impl<T> DynArg for MultiArgVec<T>
where
	T: DynArg,
{
	// #[inline(never)]
	fn dyn_load<I, D>(loader: &mut D, arg_id: ArgId) -> Self
	where
		I: TopDecodeInput,
		D: DynArgInput<I>,
	{
		let mut result_vec: Vec<T> = Vec::new();
		while loader.has_next() {
			result_vec.push(T::dyn_load(loader, arg_id));
		}
		MultiArgVec(result_vec)
	}
}

impl<T> EndpointResult for MultiArgVec<T>
where
	T: EndpointResult,
{
	type DecodeAs = MultiArgVec<T::DecodeAs>;

	#[inline]
	fn finish<FA>(&self, api: FA)
	where
		FA: EndpointFinishApi + Clone + 'static,
	{
		for elem in self.0.iter() {
			elem.finish(api.clone());
		}
	}
}

impl<T> ContractCallArg for &MultiArgVec<T>
where
	T: ContractCallArg,
{
	fn push_async_arg(&self, serializer: &mut ArgBuffer) -> Result<(), SCError> {
		for elem in self.0.iter() {
			elem.push_async_arg(serializer)?;
		}
		Ok(())
	}
}

impl<T> ContractCallArg for MultiArgVec<T>
where
	T: ContractCallArg,
{
	fn push_async_arg(&self, serializer: &mut ArgBuffer) -> Result<(), SCError> {
		(&self).push_async_arg(serializer)
	}
}

impl<T: TypeAbi> TypeAbi for MultiArgVec<T> {
	fn type_name() -> String {
		let mut repr = String::from("variadic<");
		repr.push_str(T::type_name().as_str());
		repr.push('>');
		repr
	}

	fn provide_type_descriptions<TDC: TypeDescriptionContainer>(accumulator: &mut TDC) {
		T::provide_type_descriptions(accumulator);
	}

	fn is_multi_arg_or_result() -> bool {
		true
	}
}