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// Copyright (C) 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/>.

use polkadot_node_primitives::{dispute_is_inactive, DisputeStatus, Timestamp};
use polkadot_primitives::{CandidateHash, SessionIndex};
use std::time::{SystemTime, UNIX_EPOCH};

use crate::LOG_TARGET;

/// Get active disputes as iterator, preserving its `DisputeStatus`.
pub fn get_active_with_status(
	recent_disputes: impl Iterator<Item = ((SessionIndex, CandidateHash), DisputeStatus)>,
	now: Timestamp,
) -> impl Iterator<Item = ((SessionIndex, CandidateHash), DisputeStatus)> {
	recent_disputes.filter(move |(_, status)| !dispute_is_inactive(status, &now))
}

pub trait Clock: Send + Sync {
	fn now(&self) -> Timestamp;
}

pub struct SystemClock;

impl Clock for SystemClock {
	fn now(&self) -> Timestamp {
		// `SystemTime` is notoriously non-monotonic, so our timers might not work
		// exactly as expected.
		//
		// Regardless, disputes are considered active based on an order of minutes,
		// so a few seconds of slippage in either direction shouldn't affect the
		// amount of work the node is doing significantly.
		match SystemTime::now().duration_since(UNIX_EPOCH) {
			Ok(d) => d.as_secs(),
			Err(e) => {
				gum::warn!(
					target: LOG_TARGET,
					err = ?e,
					"Current time is before unix epoch. Validation will not work correctly."
				);

				0
			},
		}
	}
}