//  Copyright 2022. The Tari Project
//
//  Redistribution and use in source and binary forms, with or without modification, are permitted provided that
// the  following conditions are met:
//
//  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
// following  disclaimer.
//
//  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
//  following disclaimer in the documentation and/or other materials provided with the distribution.
//
//  3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
//  products derived from this software without specific prior written permission.
//
//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
// WARRANTIES,  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL,  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY,  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.

use std::{fmt::Display, num::ParseIntError, str::FromStr};

use borsh::{BorshDeserialize, BorshSerialize};
use newtype_ops::newtype_ops;
use serde::{Deserialize, Serialize};

#[derive(
    Debug,
    Clone,
    Copy,
    PartialEq,
    Eq,
    PartialOrd,
    Ord,
    Hash,
    Serialize,
    Deserialize,
    Default,
    BorshSerialize,
    BorshDeserialize,
)]
pub struct VnEpoch(pub u64);

impl VnEpoch {
    pub const fn zero() -> Self {
        VnEpoch(0)
    }

    pub fn as_u64(&self) -> u64 {
        self.0
    }

    pub fn to_be_bytes(&self) -> [u8; 8] {
        self.0.to_be_bytes()
    }

    pub fn saturating_sub(self, other: VnEpoch) -> VnEpoch {
        VnEpoch(self.0.saturating_sub(other.0))
    }
}

newtype_ops! { [VnEpoch] {add sub mul div} {:=} Self Self }
newtype_ops! { [VnEpoch] {add sub mul div} {:=} &Self &Self }
newtype_ops! { [VnEpoch] {add sub mul div} {:=} Self &Self }

impl From<u64> for VnEpoch {
    fn from(value: u64) -> Self {
        Self(value)
    }
}

impl FromStr for VnEpoch {
    type Err = ParseIntError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Ok(VnEpoch(s.parse::<u64>()?))
    }
}

impl Display for VnEpoch {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "Epoch({})", self.0)
    }
}
