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use bytemuck::Pod;
use half::f16;
use safetensors::Dtype;

pub trait Zero: Sized + core::ops::Add<Self, Output = Self> {
    fn zero() -> Self;
}

impl Zero for f32 {
    fn zero() -> Self {
        0.0
    }
}

impl Zero for f16 {
    fn zero() -> Self {
        Self::ZERO
    }
}

impl Zero for u8 {
    fn zero() -> Self {
        0
    }
}

impl Zero for u16 {
    fn zero() -> Self {
        0
    }
}

impl Zero for u32 {
    fn zero() -> Self {
        0
    }
}

pub trait One: Sized + core::ops::Mul<Self, Output = Self> {
    fn one() -> Self;
}

impl One for f32 {
    fn one() -> Self {
        1.0
    }
}

impl One for f16 {
    fn one() -> Self {
        Self::ONE
    }
}

impl One for u8 {
    fn one() -> Self {
        1
    }
}

impl One for u16 {
    fn one() -> Self {
        1
    }
}

impl One for u32 {
    fn one() -> Self {
        1
    }
}

pub trait Scalar: Sized + Clone + Copy + Pod + Zero + One + sealed::Sealed {
    fn size() -> usize {
        std::mem::size_of::<Self>()
    }

    const DATA_TYPE: Dtype;
}

impl Scalar for f32 {
    const DATA_TYPE: Dtype = Dtype::F32;
}
impl Scalar for f16 {
    const DATA_TYPE: Dtype = Dtype::F16;
}
impl Scalar for u8 {
    const DATA_TYPE: Dtype = Dtype::U8;
}
impl Scalar for u16 {
    const DATA_TYPE: Dtype = Dtype::U16;
}
impl Scalar for u32 {
    const DATA_TYPE: Dtype = Dtype::U32;
}

mod sealed {
    use half::f16;

    pub trait Sealed {}

    impl Sealed for f32 {}
    impl Sealed for f16 {}
    impl Sealed for u8 {}
    impl Sealed for u16 {}
    impl Sealed for u32 {}
}