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// This file is part of Substrate.

// Copyright (C) 2019-2021 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Means for splitting an imbalance into two and hanlding them differently.

use super::super::imbalance::{Imbalance, OnUnbalanced};
use sp_core::u32_trait::Value as U32;
use sp_runtime::traits::Saturating;
use sp_std::{marker::PhantomData, ops::Div};

/// Split an unbalanced amount two ways between a common divisor.
pub struct SplitTwoWays<Balance, Imbalance, Part1, Target1, Part2, Target2>(
	PhantomData<(Balance, Imbalance, Part1, Target1, Part2, Target2)>,
);

impl<
		Balance: From<u32> + Saturating + Div<Output = Balance>,
		I: Imbalance<Balance>,
		Part1: U32,
		Target1: OnUnbalanced<I>,
		Part2: U32,
		Target2: OnUnbalanced<I>,
	> OnUnbalanced<I> for SplitTwoWays<Balance, I, Part1, Target1, Part2, Target2>
{
	fn on_nonzero_unbalanced(amount: I) {
		let total: u32 = Part1::VALUE + Part2::VALUE;
		let amount1 = amount.peek().saturating_mul(Part1::VALUE.into()) / total.into();
		let (imb1, imb2) = amount.split(amount1);
		Target1::on_unbalanced(imb1);
		Target2::on_unbalanced(imb2);
	}
}