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use std::ops::{Add, AddAssign, Neg, Sub, SubAssign};
use chrono::{DateTime, NaiveDateTime, TimeZone, Utc};
use std::time::SystemTime;

use crate::*;

/// # A UTC timestamp (date + time)
#[derive(Copy, Clone, Default, Hash, Eq, PartialEq, Ord, PartialOrd)]
pub struct Timestamp(pub(crate) TimeValue);

/// A trait for marking timestamped data
pub trait Timestamped {
    /// Gets the timestamp
    fn timestamp(&self) -> Timestamp;
}


impl Timestamp {

    /// Creates a timepoint relative to the origin
    #[inline]
    pub fn from_origin(t: TimeValue) -> Self { Self(t) }

    #[inline]
    pub fn now() -> Self {
        Self(SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().into())
    }

    #[inline]
    pub fn elapsed(&self) -> TimeValue { Self::now() - *self }

    #[inline]
    pub fn to_datetime(&self) -> DateTime<Utc> { Utc.from_utc_datetime(&(*self).into()) }

    #[inline]
    pub fn floor(self, period:TimeValue) -> Self
    {
        Self(self.0.floor(period))
    }

    #[inline]
    pub fn ceil(self, period:TimeValue) -> Self
    {
        Self(self.0.ceil(period))
    }

    /// Duration since origin
    #[inline]
    pub fn since_origin(self) -> TimeValue { self.0 }
}


impl Neg for Timestamp {
    type Output = Self;
    #[inline] fn neg(self) -> Self::Output { Self(-self.0) }
}

impl TimePoint for Timestamp
{
    const INFINITE: Self = Self(TimeValue::INFINITE);
    #[inline] fn is_finite(&self) -> bool { self.0.is_finite() }
    #[inline] fn is_future_infinite(&self) -> bool { self.0.is_future_infinite() }
    #[inline] fn is_past_infinite(&self) -> bool { self.0.is_past_infinite() }
    #[inline] fn just_after(&self) -> Self { Self(self.0.just_after()) }
    #[inline] fn just_before(&self) -> Self { Self(self.0.just_before()) }
}

impl TimeBounds for Timestamp
{
    type TimePoint = Self;
    #[inline] fn is_empty(&self) -> bool { false }
    #[inline] fn is_singleton(&self) -> bool { true }
    #[inline] fn is_bounded(&self) -> bool { self.is_finite() }
    #[inline] fn is_low_bounded(&self) -> bool { self.is_finite() }
    #[inline] fn is_up_bounded(&self) -> bool { self.is_finite() }
    #[inline] fn lower_bound(&self) -> Self::TimePoint { *self }
    #[inline] fn upper_bound(&self) -> Self::TimePoint { *self }
}

impl TimeConvex for Timestamp { }


impl Timestamped for Timestamp
{
    #[inline] fn timestamp(&self) -> Timestamp { *self }
}

impl<T:Timestamped> Timestamped for &T
{
    #[inline] fn timestamp(&self) -> Timestamp { T::timestamp(self) }
}

impl From<Timestamp> for NaiveDateTime
{
    #[inline]
    fn from(value: Timestamp) -> Self {
        NaiveDateTime::from_timestamp_opt( value.0.as_secs(), value.0.subsec_nanos() as u32).unwrap()
    }
}

impl From<NaiveDateTime> for Timestamp
{
    #[inline]
    fn from(t: NaiveDateTime) -> Self {
        Self(TimeValue::from_nanos(t.timestamp_nanos_opt().unwrap()))
    }
}


impl<Tz:TimeZone> From<DateTime<Tz>> for Timestamp
{
    #[inline]
    fn from(t: DateTime<Tz>) -> Self {
        Self(TimeValue::from_nanos(t.timestamp_nanos_opt().unwrap()))
    }
}



impl Sub for Timestamp {
    type Output = TimeValue;
    /// Distance between two timestamps
    #[inline] fn sub(self, other: Self) -> Self::Output { self.0 - other.0 }
}

impl Add<TimeValue> for Timestamp
{
    type Output = Self;
    #[inline] fn add(self, other: TimeValue) -> Self::Output { Self(self.0+other) }
}

impl Sub<TimeValue> for Timestamp
{
    type Output = Self;
    #[inline] fn sub(self, other: TimeValue) -> Self::Output { Self(self.0-other) }
}

impl AddAssign<TimeValue> for Timestamp
{
    #[inline]
    fn add_assign(&mut self, other: TimeValue) { self.0 += other; }
}

impl SubAssign<TimeValue> for Timestamp
{
    #[inline]
    fn sub_assign(&mut self, other: TimeValue) { self.0 -= other; }
}

impl Add<Timestamp> for TimeValue {
    type Output = Timestamp;
    #[inline] fn add(self, tw: Self::Output) -> Self::Output { tw + self }
}

impl Sub<Timestamp> for TimeValue {
    type Output = Timestamp;
    #[inline] fn sub(self, tw: Self::Output) -> Self::Output { (-tw) + self }
}