// 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 Services Payment pallet

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

sp_api::decl_runtime_apis! {

    // TODO: do we need to update the api version?

    pub trait ServicesPaymentApi<AccountId, Balance, ParaId>

    where

        AccountId: parity_scale_codec::Codec,

        Balance: parity_scale_codec::Codec,

        ParaId: parity_scale_codec::Codec,

    {

        fn block_cost(para_id: ParaId) -> Balance;

        fn collator_assignment_cost(para_id: ParaId) -> Balance;

        /// Calculate the parachain tank account for a given para ID.

        ///

        /// This account is derived by:

        /// 1. Encoding the tuple ("modlpy/serpayment", para_id) using SCALE encoding

        /// 2. Hashing it with Blake2-256

        /// 3. Decoding the hash as an AccountId

        fn parachain_tank_account(para_id: ParaId) -> AccountId;

    }