use crate::{backend, io};

pub use crate::timespec::{Nsecs, Secs, Timespec};

/// `clockid_t`

#[cfg(not(target_os = "wasi"))]

pub use crate::clockid::{ClockId, DynamicClockId};

/// `clock_getres(id)`—Returns the resolution of a clock.

///

/// # References

///  - [POSIX]

///  - [Linux]

///  - [FreeBSD]

///  - [NetBSD]

///  - [OpenBSD]

///  - [DragonFly BSD]

///  - [illumos]

///

/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/clock_getres.html

/// [Linux]: https://man7.org/linux/man-pages/man2/clock_getres.2.html

/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=clock_getres&sektion=2

/// [NetBSD]: https://man.netbsd.org/clock_getres.2

/// [OpenBSD]: https://man.openbsd.org/clock_getres.2

/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=clock_getres&section=2

/// [illumos]: https://illumos.org/man/3C/clock_getres

#[cfg(not(any(target_os = "redox", target_os = "wasi")))]

#[inline]

#[must_use]

pub fn clock_getres(id: ClockId) -> Timespec {

    backend::time::syscalls::clock_getres(id)

}

/// `clock_gettime(id)`—Returns the current value of a clock.

///

/// This function uses `ClockId` which only contains clocks which are known to

/// always be supported at runtime, allowing this function to be infallible.

/// For a greater set of clocks and dynamic clock support, see

/// [`clock_gettime_dynamic`].

///

/// # References

///  - [POSIX]

///  - [Linux]

///  - [FreeBSD]

///  - [NetBSD]

///  - [OpenBSD]

///  - [DragonFly BSD]

///  - [illumos]

///

/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/clock_gettime.html

/// [Linux]: https://man7.org/linux/man-pages/man2/clock_gettime.2.html

/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=clock_getres&sektion=2

/// [NetBSD]: https://man.netbsd.org/clock_getres.2

/// [OpenBSD]: https://man.openbsd.org/clock_getres.2

/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=clock_getres&section=2

/// [illumos]: https://illumos.org/man/3C/clock_gettime

#[cfg(not(target_os = "wasi"))]

#[inline]

#[must_use]

pub fn clock_gettime(id: ClockId) -> Timespec {

    backend::time::syscalls::clock_gettime(id)

}

/// Like [`clock_gettime`] but with support for dynamic clocks.

///

/// # References

///  - [POSIX]

///  - [Linux]

///

/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/clock_gettime.html

/// [Linux]: https://man7.org/linux/man-pages/man2/clock_gettime.2.html

#[cfg(not(target_os = "wasi"))]

#[inline]

pub fn clock_gettime_dynamic(id: DynamicClockId<'_>) -> io::Result<Timespec> {

    backend::time::syscalls::clock_gettime_dynamic(id)

}

/// `clock_settime(id, timespec)`—Sets the current value of a settable clock.

///

/// This fails with [`io::Errno::INVAL`] if the clock is not settable, and

/// [`io::Errno::ACCESS`] if the current process does not have permission to

/// set it.

///

/// # References

///  - [POSIX]

///  - [Linux]

///  - [FreeBSD]

///  - [NetBSD]

///  - [OpenBSD]

///  - [DragonFly BSD]

///  - [illumos]

///

/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/clock_settime.html

/// [Linux]: https://man7.org/linux/man-pages/man2/clock_settime.2.html

/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=clock_settime&sektion=2

/// [NetBSD]: https://man.netbsd.org/clock_settime.2

/// [OpenBSD]: https://man.openbsd.org/clock_settime.2

/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=clock_settime&section=2

/// [illumos]: https://illumos.org/man/3C/clock_settime

#[cfg(not(any(

    target_os = "redox",

    target_os = "wasi",

    all(apple, not(target_os = "macos"))

)))]

#[inline]

pub fn clock_settime(id: ClockId, timespec: Timespec) -> io::Result<()> {

    backend::time::syscalls::clock_settime(id, timespec)

}