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//! Linux time objects

use alloc::sync::Arc;
use core::time::Duration;
use rcore_fs::vfs::*;

/// TimeSpec struct for clock_gettime, similar to Timespec
#[repr(C)]
#[derive(Debug, Copy, Clone, Default)]
pub struct TimeSpec {
    /// seconds
    pub sec: usize,
    /// nano seconds
    pub nsec: usize,
}

/// TimeVal struct for gettimeofday
#[repr(C)]
#[derive(Debug, Copy, Clone, Default)]
pub struct TimeVal {
    /// seconds
    pub sec: usize,
    /// microsecond
    pub usec: usize,
}

impl TimeVal {
    /// create TimeVal
    pub fn now() -> TimeVal {
        TimeSpec::now().into()
    }
    /// to msec
    pub fn to_msec(&self) -> usize {
        self.sec * 1_000 + self.usec / 1_000
    }
}

impl TimeSpec {
    /// create TimeSpec
    pub fn now() -> TimeSpec {
        let time = kernel_hal::timer::timer_now();
        TimeSpec {
            sec: time.as_secs() as usize,
            nsec: (time.as_nanos() % 1_000_000_000) as usize,
        }
    }

    /// update TimeSpec for a file inode
    /// TODO: more precise; update when write
    pub fn update(inode: &Arc<dyn INode>) {
        let now = TimeSpec::now().into();
        if let Ok(mut metadata) = inode.metadata() {
            metadata.atime = now;
            metadata.mtime = now;
            metadata.ctime = now;
            // silently fail for device file
            inode.set_metadata(&metadata).ok();
        }
    }

    /// to msec
    pub fn to_msec(&self) -> usize {
        self.sec * 1_000 + self.nsec / 1_000_000
    }
}

impl From<Timespec> for TimeSpec {
    fn from(t: Timespec) -> Self {
        Self {
            sec: t.sec as _,
            nsec: t.nsec as _,
        }
    }
}

impl From<TimeSpec> for Timespec {
    fn from(t: TimeSpec) -> Self {
        Self {
            sec: t.sec as _,
            nsec: t.nsec as _,
        }
    }
}

impl From<TimeSpec> for Duration {
    fn from(t: TimeSpec) -> Self {
        Self::new(t.sec as _, t.nsec as _)
    }
}

impl From<TimeSpec> for TimeVal {
    fn from(t: TimeSpec) -> Self {
        Self {
            sec: t.sec,
            usec: t.nsec / 1_000,
        }
    }
}

/// RUsage for sys_getrusage()
/// ignore other fields for now
#[repr(C)]
pub struct RUsage {
    /// user CPU time used
    pub utime: TimeVal,
    /// system CPU time used
    pub stime: TimeVal,
}

/// Tms for times()
#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct Tms {
    /// user time
    pub tms_utime: u64,
    /// system time
    pub tms_stime: u64,
    /// user time of children
    pub tms_cutime: u64,
    /// system time of children
    pub tms_cstime: u64,
}

/// Clock id
#[derive(Debug)]
#[repr(usize)]
pub enum ClockId {
    /// missing documentation
    ClockRealTime = 0,
    /// missing documentation
    ClockMonotonic = 1,
    /// missing documentation
    ClockProcessCpuTimeId = 2,
    /// missing documentation
    ClockThreadCpuTimeId = 3,
    /// missing documentation
    ClockMonotonicRaw = 4,
    /// missing documentation
    ClockRealTimeCoarse = 5,
    /// missing documentation
    ClockMonotonicCoarse = 6,
    /// missing documentation
    ClockBootTime = 7,
    /// missing documentation
    ClockRealTimeAlarm = 8,
    /// missing documentation
    ClockBootTimeAlarm = 9,
}

impl From<usize> for ClockId {
    fn from(t: usize) -> ClockId {
        match t {
            0 => ClockId::ClockRealTime,
            1 => ClockId::ClockMonotonic,
            2 => ClockId::ClockProcessCpuTimeId,
            3 => ClockId::ClockThreadCpuTimeId,
            4 => ClockId::ClockMonotonicRaw,
            5 => ClockId::ClockRealTimeCoarse,
            6 => ClockId::ClockMonotonicCoarse,
            7 => ClockId::ClockBootTime,
            8 => ClockId::ClockRealTimeAlarm,
            9 => ClockId::ClockBootTimeAlarm,
            _ => unreachable!(),
        }
    }
}

/// Clock Flags
#[derive(Debug)]
#[repr(usize)]
pub enum ClockFlags {
    /// missing documentation
    ZeroFlag = 0,
    /// missing documentation
    TimerAbsTime = 1,
}

impl From<usize> for ClockFlags {
    fn from(t: usize) -> ClockFlags {
        match t {
            0 => ClockFlags::ZeroFlag,
            1 => ClockFlags::TimerAbsTime,
            _ => unreachable!(),
        }
    }
}