// Copyright (C) Moondance Labs Ltd.

// This file is part of Tanssi.

// Tanssi is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

// Tanssi is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License

// along with Tanssi.  If not, see <http://www.gnu.org/licenses/>

//! Runtime API for CollatorAssignment pallet. Can be used by collators to check

//! which parachain will they be collating, as well as the current assignment of

//! collators to parachains and parachains to collators.

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

use scale_info::prelude::vec::Vec;

sp_api::decl_runtime_apis! {

    #[api_version(2)]

    pub trait CollatorAssignmentApi<AccountId, ParaId> where

        AccountId: parity_scale_codec::Codec,

        ParaId: parity_scale_codec::Codec,

    {

        /// Returns the list of `ParaId` of registered chains with at least some

        /// collators. This filters out parachains with no assigned collators.

        #[api_version(2)]

        fn parachains_with_some_collators() -> Vec<ParaId>;

    }