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// Copyright (c) 2016-2017 <daggerbot@gmail.com>
// This software is available under the terms of the zlib license.
// See COPYING.md for more information.

use numeric::{Clamp, ClampError, ClampFrom, Lerp};

use lum::{Lum, LumAlpha};

/// Red-green-blue color structure.
#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
#[cfg_attr(feature = "rustc-serialize", derive(RustcEncodable, RustcDecodable))]
#[cfg_attr(feature = "serde_derive", derive(Serialize, Deserialize))]
pub struct Rgb<T> (pub T, pub T, pub T);

impl<T> Rgb<T> {
    #[inline(always)]
    pub fn blue (self) -> T { self.2 }

    #[inline(always)]
    pub fn green (self) -> T { self.1 }

    pub fn luminance (self) -> f64 where f64: ClampFrom<T> {
        use numeric::ClampFrom;
        let r = f64::clamp_from(self.0);
        let g = f64::clamp_from(self.1);
        let b = f64::clamp_from(self.2);
        r * 0.2126 + g * 0.7152 + b * 0.0722
    }

    #[inline(always)]
    pub fn red (self) -> T { self.0 }

    pub fn with_alpha (self, alpha: T) -> Rgba<T> {
        Rgba(self.0, self.1, self.2, alpha)
    }
}

impl<F, T: ClampFrom<F>> ClampFrom<Rgb<F>> for Rgb<T> {
    fn clamp_from (other: Rgb<F>) -> Rgb<T> {
        Rgb(T::clamp_from(other.0), T::clamp_from(other.1), T::clamp_from(other.2))
    }

    fn saturating_clamp_from (other: Rgb<F>) -> Rgb<T> {
        Rgb(T::saturating_clamp_from(other.0),
            T::saturating_clamp_from(other.1),
            T::saturating_clamp_from(other.2))
    }

    fn try_clamp_from (other: Rgb<F>) -> Result<Rgb<T>, ClampError> {
        Ok(Rgb(T::try_clamp_from(other.0)?,
               T::try_clamp_from(other.1)?,
               T::try_clamp_from(other.2)?))
    }
}

impl<T: Clone> From<Lum<T>> for Rgb<T> {
    fn from (other: Lum<T>) -> Rgb<T> { Rgb(other.0.clone(), other.0.clone(), other.0) }
}

impl<S: Lerp<T>, T: Copy> Lerp<T> for Rgb<S> {
    fn lerp (a: Rgb<S>, b: Rgb<S>, t: T) -> Rgb<S> {
        Rgb(S::lerp(a.0, b.0, t), S::lerp(a.1, b.1, t), S::lerp(a.2, b.2, t))
    }
}

/// Red-green-blue-alpha color structure.
#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
#[cfg_attr(feature = "rustc-serialize", derive(RustcEncodable, RustcDecodable))]
#[cfg_attr(feature = "serde_derive", derive(Serialize, Deserialize))]
pub struct Rgba<T> (pub T, pub T, pub T, pub T);

impl<T> Rgba<T> {
    #[inline(always)]
    pub fn alpha (self) -> T { self.3 }

    #[inline(always)]
    pub fn blue (self) -> T { self.2 }

    pub fn drop_alpha (self) -> Rgb<T> { Rgb(self.0, self.1, self.2) }

    #[inline(always)]
    pub fn green (self) -> T { self.1 }

    pub fn luminance (self) -> f64 where f64: ClampFrom<T> {
        use numeric::ClampFrom;
        let r = f64::clamp_from(self.0);
        let g = f64::clamp_from(self.1);
        let b = f64::clamp_from(self.2);
        r * 0.2126 + g * 0.7152 + b * 0.0722
    }

    #[inline(always)]
    pub fn red (self) -> T { self.0 }

    pub fn split_alpha (self) -> (Rgb<T>, T) {
        (Rgb(self.0, self.1, self.2), self.3)
    }
}

impl<F, T: ClampFrom<F>> ClampFrom<Rgba<F>> for Rgba<T> {
    fn clamp_from (other: Rgba<F>) -> Rgba<T> {
        Rgba(T::clamp_from(other.0),
             T::clamp_from(other.1),
             T::clamp_from(other.2),
             T::clamp_from(other.3))
    }

    fn saturating_clamp_from (other: Rgba<F>) -> Rgba<T> {
        Rgba(T::saturating_clamp_from(other.0),
             T::saturating_clamp_from(other.1),
             T::saturating_clamp_from(other.2),
             T::saturating_clamp_from(other.3))
    }

    fn try_clamp_from (other: Rgba<F>) -> Result<Rgba<T>, ClampError> {
        Ok(Rgba(T::try_clamp_from(other.0)?,
                T::try_clamp_from(other.1)?,
                T::try_clamp_from(other.2)?,
                T::try_clamp_from(other.3)?))
    }
}

impl<T: Clone + Clamp> From<Lum<T>> for Rgba<T> {
    fn from (other: Lum<T>) -> Rgba<T> {
        Rgba(other.0.clone(), other.0.clone(), other.0, T::clamp_max())
    }
}

impl<T: Clone + Clamp> From<Option<Lum<T>>> for Rgba<T> {
    fn from (other: Option<Lum<T>>) -> Rgba<T> {
        match other {
            None => Rgba(T::clamp_min(), T::clamp_min(), T::clamp_min(), T::clamp_min()),
            Some(other) => Rgba(other.0.clone(), other.0.clone(), other.0, T::clamp_max()),
        }
    }
}

impl<T: Clone> From<LumAlpha<T>> for Rgba<T> {
    fn from (other: LumAlpha<T>) -> Rgba<T> {
        Rgba(other.0.clone(), other.0.clone(), other.0, other.1)
    }
}

impl<T: Clamp> From<Rgb<T>> for Rgba<T> {
    fn from (other: Rgb<T>) -> Rgba<T> { Rgba(other.0, other.1, other.2, T::clamp_max()) }
}

impl<T: Clamp> From<Option<Rgb<T>>> for Rgba<T> {
    fn from (other: Option<Rgb<T>>) -> Rgba<T> {
        match other {
            None => Rgba(T::clamp_min(), T::clamp_min(), T::clamp_min(), T::clamp_min()),
            Some(other) => Rgba(other.0, other.1, other.2, T::clamp_max()),
        }
    }
}

impl<S: Lerp<T>, T: Copy> Lerp<T> for Rgba<S> {
    fn lerp (a: Rgba<S>, b: Rgba<S>, t: T) -> Rgba<S> {
        Rgba(S::lerp(a.0, b.0, t), S::lerp(a.1, b.1, t), S::lerp(a.2, b.2, t), S::lerp(a.3, b.3, t))
    }
}