// Copyright 2019-2021 Parity Technologies (UK) Ltd.
// This file is part of Parity Bridges Common.

// Parity Bridges Common 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.

// Parity Bridges Common 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 Parity Bridges Common.  If not, see <http://www.gnu.org/licenses/>.

//! Primitives that may be used by different message delivery and dispatch mechanisms.

use codec::{Decode, Encode};
use frame_support::{weights::Weight, RuntimeDebug};

/// Where message dispatch fee is paid?
#[derive(Encode, Decode, RuntimeDebug, Clone, PartialEq, Eq)]
pub enum DispatchFeePayment {
	/// The dispacth fee is paid at the source chain.
	AtSourceChain,
	/// The dispatch fee is paid at the target chain.
	///
	/// The fee will be paid right before the message is dispatched. So in case of any other
	/// issues (like invalid call encoding, invalid signature, ...) the dispatch module won't
	/// do any direct transfers. Instead, it'll return fee related to this message dispatch to the
	/// relayer.
	AtTargetChain,
}

/// Message dispatch result.
#[derive(Encode, Decode, RuntimeDebug, Clone, PartialEq, Eq)]
pub struct MessageDispatchResult {
	/// Unspent dispatch weight. This weight that will be deducted from total delivery transaction
	/// weight, thus reducing the transaction cost. This shall not be zero in (at least) two cases:
	///
	/// 1) if message has been dispatched successfully, but post-dispatch weight is less than
	///    the weight, declared by the message sender;
	/// 2) if message has not been dispatched at all.
	pub unspent_weight: Weight,
	/// Whether the message dispatch fee has been paid during dispatch. This will be true if your
	/// configuration supports pay-dispatch-fee-at-target-chain option and message sender has enabled
	/// this option.
	pub dispatch_fee_paid_during_dispatch: bool,
}