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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.

//! Runtime API definition for nomination-pools pallet.
//! Currently supports only one rpc endpoint.

#![cfg_attr(not(feature = "std"), no_std)]

use codec::Codec;
use pallet_nomination_pools::PoolId;

sp_api::decl_runtime_apis! {
	/// Runtime api for accessing information about nomination pools.
	pub trait NominationPoolsApi<AccountId, Balance>
		where
			AccountId: Codec,
			Balance: Codec,
	{
		/// Returns the pending rewards for the member that the AccountId was given for.
		fn pending_rewards(who: AccountId) -> Balance;

		/// Returns the equivalent balance of `points` for a given pool.
		fn points_to_balance(pool_id: PoolId, points: Balance) -> Balance;

		/// Returns the equivalent points of `new_funds` for a given pool.
		fn balance_to_points(pool_id: PoolId, new_funds: Balance) -> Balance;

		/// Returns the pending slash for a given pool.
		fn pool_pending_slash(pool_id: PoolId) -> Balance;

		/// Returns the pending slash for a given pool member.
		///
		/// If pending slash of the member exceeds `ExistentialDeposit`, it can be reported on
		/// chain.
		fn member_pending_slash(member: AccountId) -> Balance;

		/// Returns true if the pool with `pool_id` needs migration.
		///
		/// This can happen when the `pallet-nomination-pools` has switched to using strategy
		/// [`DelegateStake`](pallet_nomination_pools::adapter::DelegateStake) but the pool
		/// still has funds that were staked using the older strategy
		/// [TransferStake](pallet_nomination_pools::adapter::TransferStake). Use
		/// [`migrate_pool_to_delegate_stake`](pallet_nomination_pools::Call::migrate_pool_to_delegate_stake)
		/// to migrate the pool.
		fn pool_needs_delegate_migration(pool_id: PoolId) -> bool;

		/// Returns true if the delegated funds of the pool `member` needs migration.
		///
		/// Once a pool has successfully migrated to the strategy
		/// [`DelegateStake`](pallet_nomination_pools::adapter::DelegateStake), the funds of the
		/// member can be migrated from pool account to the member's account. Use
		/// [`migrate_delegation`](pallet_nomination_pools::Call::migrate_delegation)
		/// to migrate the funds of the pool member.
		fn member_needs_delegate_migration(member: AccountId) -> bool;

		/// Returns the total contribution of a pool member including any balance that is unbonding.
		fn member_total_balance(who: AccountId) -> Balance;

		/// Total balance contributed to the pool.
		fn pool_balance(pool_id: PoolId) -> Balance;

		/// Returns the bonded account and reward account associated with the pool_id.
		fn pool_accounts(pool_id: PoolId) -> (AccountId, AccountId);
	}
}