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//! A channel that is represented by an angle

use angle::Angle;
#[cfg(feature = "approx")]
use approx;

use crate::channel::{ChannelCast, ChannelFormatCast, ColorChannel};
use crate::color;
use crate::color::Lerp;
use num_traits;
use std::fmt;
use std::ops;

/// A tag uniquely identifying an AngularChannel
pub struct AngularChannelTag;

/// A channel that is represented by an angle
#[repr(transparent)]
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct AngularChannel<T>(pub T);

impl<T> AngularChannel<T>
where
    T: Angle,
{
    /// Construct a new `AngularChannel`
    pub fn new(val: T) -> Self {
        AngularChannel(val)
    }
}

impl<T> ColorChannel for AngularChannel<T>
where
    T: Angle + Default + ops::Add<T, Output = T> + ops::Sub<T, Output = T>,
{
    type Format = T;
    type Scalar = T::Scalar;
    type Tag = AngularChannelTag;

    fn min_bound() -> T {
        T::zero()
    }

    fn max_bound() -> T {
        T::full_turn()
    }
    fn clamp(&self, min: Self::Format, max: Self::Format) -> Self {
        if self.0 < min {
            AngularChannel(min)
        } else if self.0 > max {
            AngularChannel(max)
        } else {
            self.clone()
        }
    }

    fn value(&self) -> T {
        self.0.clone()
    }
    fn scalar(&self) -> T::Scalar {
        self.0.scalar()
    }
    fn from_scalar(value: T::Scalar) -> Self {
        AngularChannel(T::new(value))
    }
    fn new(value: T) -> Self {
        AngularChannel(value)
    }
}

impl<T> ChannelCast for AngularChannel<T>
where
    T: Angle + Default + ops::Sub<T, Output = T> + ops::Add<T, Output = T>,
{
    fn channel_cast<To>(self) -> To
    where
        Self::Format: ChannelFormatCast<To::Format>,
        To: ColorChannel<Tag = Self::Tag>,
    {
        To::new(self.0.cast())
    }

    fn scalar_cast<To>(self) -> To
    where
        Self::Format: ChannelFormatCast<To>,
    {
        self.0.cast()
    }
}

impl<T> color::Invert for AngularChannel<T>
where
    T: Angle,
{
    fn invert(self) -> Self {
        AngularChannel(self.0.invert().normalize())
    }
}

impl<T> Lerp for AngularChannel<T>
where
    T: Angle + Lerp,
{
    type Position = T::Position;
    fn lerp(&self, right: &Self, pos: Self::Position) -> Self {
        AngularChannel(self.0.lerp(&right.0, pos).normalize())
    }
}

impl<T> color::Bounded for AngularChannel<T>
where
    T: Angle,
{
    fn normalize(self) -> Self {
        AngularChannel(<T as Angle>::normalize(self.0))
    }
    fn is_normalized(&self) -> bool {
        <T as Angle>::is_normalized(&self.0)
    }
}

impl<T> Default for AngularChannel<T>
where
    T: Angle + num_traits::Zero,
{
    fn default() -> Self {
        AngularChannel(T::zero())
    }
}

impl<T> fmt::Display for AngularChannel<T>
where
    T: Angle + fmt::Display,
{
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.0)
    }
}

#[cfg(feature = "approx")]
impl<T> approx::AbsDiffEq for AngularChannel<T>
where
    T: Angle + approx::AbsDiffEq,
    T::Epsilon: num_traits::Float,
{
    type Epsilon = T::Epsilon;

    fn default_epsilon() -> Self::Epsilon {
        T::default_epsilon()
    }
    fn abs_diff_eq(&self, other: &Self, epsilon: Self::Epsilon) -> bool {
        self.0
            .abs_diff_eq(&other.0, epsilon * num_traits::cast(T::period()).unwrap())
    }
}
#[cfg(feature = "approx")]
impl<T> approx::RelativeEq for AngularChannel<T>
where
    T: Angle + approx::RelativeEq,
    T::Epsilon: num_traits::Float,
{
    fn default_max_relative() -> Self::Epsilon {
        T::default_max_relative()
    }
    fn relative_eq(
        &self,
        other: &Self,
        epsilon: Self::Epsilon,
        max_relative: Self::Epsilon,
    ) -> bool {
        self.0.clone().normalize().relative_eq(
            &other.0.clone().normalize(),
            epsilon * num_traits::cast(T::period()).unwrap(),
            max_relative,
        )
    }
}

#[cfg(feature = "approx")]
impl<T> approx::UlpsEq for AngularChannel<T>
where
    T: Angle + approx::UlpsEq,
    T::Epsilon: num_traits::Float,
{
    fn default_max_ulps() -> u32 {
        T::default_max_ulps()
    }

    fn ulps_eq(&self, other: &Self, epsilon: Self::Epsilon, max_ulps: u32) -> bool {
        self.0.ulps_eq(
            &other.0,
            epsilon * num_traits::cast(T::period()).unwrap(),
            max_ulps,
        )
    }
}