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use crate::{ctx::*, DekuError, DekuRead, DekuWrite};
use bitvec::prelude::*;
use core::num::*;

#[cfg(feature = "alloc")]
use alloc::format;

macro_rules! ImplDekuTraitsCtx {
    ($typ:ty, $readtype:ty, $ctx_arg:tt, $ctx_type:tt) => {
        impl DekuRead<'_, $ctx_type> for $typ {
            fn read(
                input: &BitSlice<Msb0, u8>,
                $ctx_arg: $ctx_type,
            ) -> Result<(&BitSlice<Msb0, u8>, Self), DekuError>
            where
                Self: Sized,
            {
                let (rest, value) = <$readtype>::read(input, $ctx_arg)?;
                let value = <$typ>::new(value);

                match value {
                    None => Err(DekuError::Parse(format!("NonZero assertion"))),
                    Some(v) => Ok((rest, v)),
                }
            }
        }

        impl DekuWrite<$ctx_type> for $typ {
            fn write(
                &self,
                output: &mut BitVec<Msb0, u8>,
                $ctx_arg: $ctx_type,
            ) -> Result<(), DekuError> {
                let value = self.get();
                value.write(output, $ctx_arg)
            }
        }
    };
}

macro_rules! ImplDekuTraits {
    ($typ:ty, $readtype:ty) => {
        ImplDekuTraitsCtx!($typ, $readtype, (), ());
        ImplDekuTraitsCtx!($typ, $readtype, (endian, size), (Endian, Size));
        ImplDekuTraitsCtx!($typ, $readtype, endian, Endian);
        ImplDekuTraitsCtx!($typ, $readtype, size, Size);
    };
}

ImplDekuTraits!(NonZeroU8, u8);
ImplDekuTraits!(NonZeroU16, u16);
ImplDekuTraits!(NonZeroU32, u32);
ImplDekuTraits!(NonZeroU64, u64);
ImplDekuTraits!(NonZeroU128, u128);
ImplDekuTraits!(NonZeroUsize, usize);
ImplDekuTraits!(NonZeroI8, i8);
ImplDekuTraits!(NonZeroI16, i16);
ImplDekuTraits!(NonZeroI32, i32);
ImplDekuTraits!(NonZeroI64, i64);
ImplDekuTraits!(NonZeroI128, i128);
ImplDekuTraits!(NonZeroIsize, isize);

#[cfg(test)]
mod tests {
    use super::*;
    use hexlit::hex;
    use rstest::rstest;

    #[rstest(input, expected,
        case(&hex!("FF"), NonZeroU8::new(0xFF).unwrap()),

        #[should_panic(expected = "Parse(\"NonZero assertion\")")]
        case(&hex!("00"), NonZeroU8::new(0xFF).unwrap()),
    )]
    fn test_non_zero(input: &[u8], expected: NonZeroU8) {
        let bit_slice = input.view_bits::<Msb0>();
        let (rest, res_read) = NonZeroU8::read(bit_slice, ()).unwrap();
        assert_eq!(expected, res_read);
        assert!(rest.is_empty());

        let mut res_write = bitvec![Msb0, u8;];
        res_read.write(&mut res_write, ()).unwrap();
        assert_eq!(input.to_vec(), res_write.into_vec());
    }
}