// Copyright 2017 Parity Technologies (UK) Ltd.
// This file is part of Polkadot.

// Polkadot 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.

// Polkadot 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 Polkadot.  If not, see <http://www.gnu.org/licenses/>.

//! Utils for block interaction.

use rstd::prelude::*;
use super::{Call, UncheckedExtrinsic, Extrinsic, Staking};
use runtime_primitives::traits::{Checkable, AuxLookup};
use timestamp::Call as TimestampCall;
use parachains::Call as ParachainsCall;
use session::Call as SessionCall;

/// Produces the list of inherent extrinsics.
pub fn inherent_extrinsics(data: ::primitives::InherentData) -> Vec<UncheckedExtrinsic> {
	let make_inherent = |function|	UncheckedExtrinsic::new(
		Extrinsic {
			signed: Default::default(),
			function,
			index: 0,
		},
		Default::default(),
	);

	let mut inherent = vec![
		make_inherent(Call::Timestamp(TimestampCall::set(data.timestamp))),
		make_inherent(Call::Parachains(ParachainsCall::set_heads(data.parachain_heads))),
	];

	if !data.offline_indices.is_empty() {
		inherent.push(make_inherent(
			Call::Session(SessionCall::note_offline(data.offline_indices))
		));
	}

	inherent
}

/// Checks an unchecked extrinsic for validity.
pub fn check_extrinsic(xt: UncheckedExtrinsic) -> bool {
	xt.check_with(Staking::lookup).is_ok()
}