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// This file is part of Substrate.

// Copyright (C) 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.

//! Types used in the Fast Unstake pallet.

use crate::Config;
use codec::{Decode, Encode, MaxEncodedLen};
use frame_support::{
	traits::Currency, BoundedVec, EqNoBound, PartialEqNoBound, RuntimeDebugNoBound,
};
use scale_info::TypeInfo;
use sp_staking::{EraIndex, StakingInterface};
use sp_std::prelude::*;

/// Maximum number of eras that we might check for a single staker.
///
/// In effect, it is the bonding duration, coming from [`Config::Staking`], plus one.
#[derive(scale_info::TypeInfo, codec::Encode, codec::Decode, codec::MaxEncodedLen)]
#[codec(mel_bound(T: Config))]
#[scale_info(skip_type_params(T))]
pub struct MaxChecking<T: Config>(sp_std::marker::PhantomData<T>);
impl<T: Config> frame_support::traits::Get<u32> for MaxChecking<T> {
	fn get() -> u32 {
		T::Staking::bonding_duration() + 1
	}
}

pub(crate) type BalanceOf<T> =
	<<T as Config>::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance;
/// An unstake request.
///
/// This is stored in [`crate::Head`] storage item and points to the current unstake request that is
/// being processed.
#[derive(
	Encode, Decode, EqNoBound, PartialEqNoBound, Clone, TypeInfo, RuntimeDebugNoBound, MaxEncodedLen,
)]
#[scale_info(skip_type_params(T))]
pub struct UnstakeRequest<T: Config> {
	/// This list of stashes are being processed in this request, and their corresponding deposit.
	pub stashes: BoundedVec<(T::AccountId, BalanceOf<T>), T::BatchSize>,
	/// The list of eras for which they have been checked.
	pub checked: BoundedVec<EraIndex, MaxChecking<T>>,
}