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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

use core::{
    ops::{Add, Sub},
    cmp::{Ord, PartialOrd, Ordering},
    fmt::{self, Debug},
};
use crate::{
    kty::{timespec, time_t, k_long},
    result::{Result},
    util::int::{Int},
};
use std::fmt::Formatter;

pub mod clock;
pub mod timer;
//pub mod tz;

pub fn time_from_timespec(t: timespec) -> Time {
    Time {
        seconds:     t.tv_sec  as i64,
        nanoseconds: t.tv_nsec as i64,
    }
}

pub fn time_to_timespec(d: Time) -> timespec {
    timespec {
        tv_sec:  d.seconds     as time_t,
        tv_nsec: d.nanoseconds as k_long,
    }
}

const NANOS_PER_SEC: i64 = 1_000_000_000;
const NANOS_PER_MILLI: i64 = 1_000_000;
const NANOS_PER_MICRO: i64 = 1_000;
const MICROS_PER_SEC: i64 = 1_000_000;
const MILLIS_PER_SEC: i64 = 1_000;
const SECS_PER_MIN: i64 = 60;
const SECS_PER_HOUR: i64 = 60 * SECS_PER_MIN;
const SECS_PER_DAY: i64 = 24 * SECS_PER_HOUR;

/// A time offset.
///
/// = Remarks
///
/// This can have various meanings such as the duration of a timeout parameter or the
/// offset from the epoch when a file was created.
#[derive(Pod, Copy, Clone, PartialEq, Eq)]
pub struct Time {
    /// The seconds part of the offset.
    pub seconds: i64,
    /// The nanoseconds part of the offset.
    pub nanoseconds: i64,
}

impl Time {
    /// Normalizes the time.
    ///
    /// = Remarks
    ///
    /// That is, transforms `self` into an equivalent representation where `nanoseconds`
    /// is in [0, 1_000_000_000).
    pub fn normalize(self) -> Time {
        let (mut sec, mut nano) = self.nanoseconds.div_rem(NANOS_PER_SEC);
        if nano < 0 {
            sec -= 1;
            nano += NANOS_PER_SEC;
        }
        Time { seconds: self.seconds.saturating_add(sec), nanoseconds: nano }
    }

    /// Creates a `Time` that represents a number of nanoseconds.
    ///
    /// [argument, n]
    /// The number of nanoseconds.
    pub fn nanoseconds(n: i64) -> Time {
        let (s, n) = n.div_rem(NANOS_PER_SEC);
        Time { seconds: s, nanoseconds: n }
    }

    /// Creates a `Time` that represents a number of microseconds.
    ///
    /// [argument, m]
    /// The number of microseconds.
    pub fn microseconds(m: i64) -> Time {
        let (s, m) = m.div_rem(MICROS_PER_SEC);
        Time { seconds: s, nanoseconds: m * NANOS_PER_MICRO }
    }

    /// Creates a `Time` that represents a number of milliseconds.
    ///
    /// [argument, m]
    /// The number of milliseconds.
    pub fn milliseconds(m: i64) -> Time {
        let (s, m) = m.div_rem(MILLIS_PER_SEC);
        Time { seconds: s, nanoseconds: m * NANOS_PER_MILLI }
    }

    /// Creates a `Time` that represents a number of seconds.
    ///
    /// [argument, s]
    /// The number of seconds.
    pub fn seconds(s: i64) -> Time {
        Time { seconds: s, nanoseconds: 0 }
    }

    /// Creates a `Time` that represents a number of minutes.
    ///
    /// [argument, m]
    /// The number of minutes.
    pub fn minutes(m: i64) -> Time {
        Time::seconds(m.wrapping_mul(SECS_PER_MIN))
    }

    /// Creates a `Time` that represents  a number of hours.
    ///
    /// [argument, h]
    /// The number of hours.
    pub fn hours(h: i64) -> Time {
        Time::seconds(h.wrapping_mul(SECS_PER_HOUR))
    }

    /// Creates a `Time` that represents  a number of days.
    ///
    /// [argument, d]
    /// The number of days.
    pub fn days(d: i64) -> Time {
        Time::seconds(d.wrapping_mul(SECS_PER_DAY))
    }
}

impl Debug for Time {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        let time = self.normalize();
        core::write!(f, "\"{}s {}ns\"", time.seconds, time.nanoseconds)
    }
}

impl Add for Time {
    type Output = Time;

    fn add(self, other: Time) -> Time {
        let one = self.normalize();
        let two = other.normalize();
        let time = Time {
            seconds: one.seconds.saturating_add(two.seconds),
            nanoseconds: one.nanoseconds + two.nanoseconds,
        };
        time.normalize()
    }
}

impl Sub for Time {
    type Output = Time;

    fn sub(self, other: Time) -> Time {
        let one = self.normalize();
        let two = other.normalize();
        let time = Time {
            seconds: one.seconds.saturating_sub(two.seconds),
            nanoseconds: one.nanoseconds - two.nanoseconds,
        };
        time.normalize()
    }
}

impl PartialOrd for Time {
    fn partial_cmp(&self, other: &Time) -> Option<Ordering> {
        Some(self.cmp(&other))
    }
}

impl Ord for Time {
    fn cmp(&self, other: &Time) -> Ordering {
        let one = self.normalize();
        let two = other.normalize();
        (one.seconds, one.nanoseconds).cmp(&(two.seconds, two.nanoseconds))
    }
}