// 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.

use frame_support::{

	traits::{Get, OnRuntimeUpgrade},

	weights::Weight,

};

use crate::{Config, CurrentSetId, SetIdSession, LOG_TARGET};

pub use v5::MigrateV4ToV5;

/// Version 4.

pub mod v4;

mod v5;

/// This migration will clean up all stale set id -> session entries from the

/// `SetIdSession` storage map, only the latest `max_set_id_session_entries`

/// will be kept.

///

/// This migration should be added with a runtime upgrade that introduces the

/// `MaxSetIdSessionEntries` constant to the pallet (although it could also be

/// done later on).

pub struct CleanupSetIdSessionMap<T>(core::marker::PhantomData<T>);

impl<T: Config> OnRuntimeUpgrade for CleanupSetIdSessionMap<T> {

				target: LOG_TARGET,

			);

}