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use burn_tensor::Element;
use ndarray::LinalgScalar;
use num_traits::Signed;

#[cfg(not(feature = "std"))]
use num_traits::Float;

use num_traits::Pow;

use libm::{log1p, log1pf};

/// A float element for ndarray backend.
pub trait FloatNdArrayElement: NdArrayElement + LinalgScalar + Signed
where
    Self: Sized,
{
}

/// A general element for ndarray backend.
pub trait NdArrayElement:
    Element
    + ndarray::LinalgScalar
    + ndarray::ScalarOperand
    + ExpElement
    + num_traits::FromPrimitive
    + core::ops::AddAssign
    + core::cmp::PartialEq
    + core::cmp::PartialOrd<Self>
{
}

/// A element for ndarray backend that supports exp ops.
pub trait ExpElement {
    fn exp_elem(self) -> Self;
    fn log_elem(self) -> Self;
    fn log1p_elem(self) -> Self;
    fn powf_elem(self, value: f32) -> Self;
    fn powi_elem(self, value: i32) -> Self;
    fn sqrt_elem(self) -> Self;
    fn abs_elem(self) -> Self;
    fn int_abs_elem(self) -> Self;
}

/// A quantized element for the ndarray backend.
pub trait QuantElement: NdArrayElement {}

impl QuantElement for i8 {}

impl FloatNdArrayElement for f64 {}
impl FloatNdArrayElement for f32 {}

macro_rules! make_elem {
    (
        double
        $ty:ty
    ) => {
        impl NdArrayElement for $ty {}

        impl ExpElement for $ty {
            #[inline(always)]
            fn exp_elem(self) -> Self {
                (self as f64).exp() as $ty
            }

            #[inline(always)]
            fn log_elem(self) -> Self {
                (self as f64).ln() as $ty
            }

            #[inline(always)]
            fn log1p_elem(self) -> Self {
                log1p(self as f64) as $ty
            }

            #[inline(always)]
            fn powf_elem(self, value: f32) -> Self {
                (self as f64).pow(value) as $ty
            }

            #[inline(always)]
            fn powi_elem(self, value: i32) -> Self {
                #[cfg(feature = "std")]
                let val = f64::powi(self as f64, value) as $ty;

                #[cfg(not(feature = "std"))]
                let val = Self::powf_elem(self, value as f32);

                val
            }

            #[inline(always)]
            fn sqrt_elem(self) -> Self {
                (self as f64).sqrt() as $ty
            }

            #[inline(always)]
            fn abs_elem(self) -> Self {
                (self as f64).abs() as $ty
            }

            #[inline(always)]
            fn int_abs_elem(self) -> Self {
                (self as i64).abs() as $ty
            }
        }
    };
    (
        single
        $ty:ty
    ) => {
        impl NdArrayElement for $ty {}

        impl ExpElement for $ty {
            #[inline(always)]
            fn exp_elem(self) -> Self {
                (self as f32).exp() as $ty
            }

            #[inline(always)]
            fn log_elem(self) -> Self {
                (self as f32).ln() as $ty
            }

            #[inline(always)]
            fn log1p_elem(self) -> Self {
                log1pf(self as f32) as $ty
            }

            #[inline(always)]
            fn powf_elem(self, value: f32) -> Self {
                (self as f32).pow(value) as $ty
            }

            #[inline(always)]
            fn powi_elem(self, value: i32) -> Self {
                #[cfg(feature = "std")]
                let val = f32::powi(self as f32, value) as $ty;

                #[cfg(not(feature = "std"))]
                let val = Self::powf_elem(self, value as f32);

                val
            }

            #[inline(always)]
            fn sqrt_elem(self) -> Self {
                (self as f32).sqrt() as $ty
            }

            #[inline(always)]
            fn abs_elem(self) -> Self {
                (self as f32).abs() as $ty
            }

            #[inline(always)]
            fn int_abs_elem(self) -> Self {
                (self as i32).unsigned_abs() as $ty
            }
        }
    };
}

make_elem!(double f64);
make_elem!(double i64);

make_elem!(single f32);
make_elem!(single i32);
make_elem!(single i16);
make_elem!(single i8);
make_elem!(single u8);