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// Copyright (c) The Diem Core Contributors
// SPDX-License-Identifier: Apache-2.0

// Copyright 2021 Conflux Foundation. All rights reserved.
// Conflux is free software and distributed under GNU General Public License.
// See http://www.gnu.org/licenses/

use crate::vote::Vote;
use serde::{Deserialize, Serialize};
use std::fmt;

/// Data structure for safety rules to ensure consensus safety.
#[derive(Debug, Deserialize, Eq, PartialEq, Serialize, Clone, Default)]
pub struct SafetyData {
    pub epoch: u64,
    pub last_voted_round: u64,
    pub preferred_round: u64,
    pub last_vote: Option<Vote>,
}

impl SafetyData {
    pub fn new(
        epoch: u64, last_voted_round: u64, preferred_round: u64,
        last_vote: Option<Vote>,
    ) -> Self {
        Self {
            epoch,
            last_voted_round,
            preferred_round,
            last_vote,
        }
    }
}

impl fmt::Display for SafetyData {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(
            f,
            "SafetyData: [epoch: {}, last_voted_round: {}, preferred_round: {}]",
            self.epoch, self.last_voted_round, self.preferred_round
        )
    }
}