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//
// Copyright 2024 Signal Messenger, LLC.
// SPDX-License-Identifier: AGPL-3.0-only
//

use serde::{Deserialize, Serialize};

/// Timestamp recorded as milliseconds since the Unix epoch.
#[derive(Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd, Hash, Serialize, Deserialize)]
#[repr(transparent)]
pub struct Timestamp(u64);

impl Timestamp {
    pub const fn from_epoch_millis(milliseconds: u64) -> Self {
        Self(milliseconds)
    }

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

    pub fn add_millis(&self, milliseconds: u64) -> Self {
        Self(self.0 + milliseconds)
    }

    pub fn sub_millis(&self, milliseconds: u64) -> Timestamp {
        Self(self.0 - milliseconds)
    }
}

impl From<Timestamp> for std::time::SystemTime {
    fn from(value: Timestamp) -> Self {
        Self::UNIX_EPOCH + std::time::Duration::from_millis(value.epoch_millis())
    }
}

impl rand::distributions::Distribution<Timestamp> for rand::distributions::Standard {
    fn sample<R: rand::prelude::Rng + ?Sized>(&self, rng: &mut R) -> Timestamp {
        Timestamp(Self::sample(self, rng))
    }
}