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use std::mem;

use num_traits::NumCast;
use vortex_dtype::half::f16;
use vortex_dtype::PType;
use vortex_error::{vortex_err, VortexError};

#[derive(Debug, Clone, Copy, PartialEq, PartialOrd)]
pub enum PValue {
    U8(u8),
    U16(u16),
    U32(u32),
    U64(u64),
    I8(i8),
    I16(i16),
    I32(i32),
    I64(i64),
    F16(f16),
    F32(f32),
    F64(f64),
}

impl PValue {
    pub fn ptype(&self) -> PType {
        match self {
            Self::U8(_) => PType::U8,
            Self::U16(_) => PType::U16,
            Self::U32(_) => PType::U32,
            Self::U64(_) => PType::U64,
            Self::I8(_) => PType::I8,
            Self::I16(_) => PType::I16,
            Self::I32(_) => PType::I32,
            Self::I64(_) => PType::I64,
            Self::F16(_) => PType::F16,
            Self::F32(_) => PType::F32,
            Self::F64(_) => PType::F64,
        }
    }

    #[allow(clippy::transmute_int_to_float, clippy::transmute_float_to_int)]
    pub fn reinterpret_cast(&self, ptype: PType) -> Self {
        if ptype == self.ptype() {
            return *self;
        }

        assert_eq!(
            ptype.byte_width(),
            self.ptype().byte_width(),
            "Cannot reinterpret cast between types of different widths"
        );

        match self {
            PValue::U8(v) => unsafe { mem::transmute::<u8, i8>(*v) }.into(),
            PValue::U16(v) => match ptype {
                PType::I16 => unsafe { mem::transmute::<u16, i16>(*v) }.into(),
                PType::F16 => unsafe { mem::transmute::<u16, f16>(*v) }.into(),
                _ => unreachable!("Only same width type are allowed to be reinterpreted"),
            },
            PValue::U32(v) => match ptype {
                PType::I32 => unsafe { mem::transmute::<u32, i32>(*v) }.into(),
                PType::F32 => unsafe { mem::transmute::<u32, f32>(*v) }.into(),
                _ => unreachable!("Only same width type are allowed to be reinterpreted"),
            },
            PValue::U64(v) => match ptype {
                PType::I64 => unsafe { mem::transmute::<u64, i64>(*v) }.into(),
                PType::F64 => unsafe { mem::transmute::<u64, f64>(*v) }.into(),
                _ => unreachable!("Only same width type are allowed to be reinterpreted"),
            },
            PValue::I8(v) => unsafe { mem::transmute::<i8, u8>(*v) }.into(),
            PValue::I16(v) => match ptype {
                PType::U16 => unsafe { mem::transmute::<i16, u16>(*v) }.into(),
                PType::F16 => unsafe { mem::transmute::<i16, f16>(*v) }.into(),
                _ => unreachable!("Only same width type are allowed to be reinterpreted"),
            },
            PValue::I32(v) => match ptype {
                PType::U32 => unsafe { mem::transmute::<i32, u32>(*v) }.into(),
                PType::F32 => unsafe { mem::transmute::<i32, f32>(*v) }.into(),
                _ => unreachable!("Only same width type are allowed to be reinterpreted"),
            },
            PValue::I64(v) => match ptype {
                PType::U64 => unsafe { mem::transmute::<i64, u64>(*v) }.into(),
                PType::F64 => unsafe { mem::transmute::<i64, f64>(*v) }.into(),
                _ => unreachable!("Only same width type are allowed to be reinterpreted"),
            },
            PValue::F16(v) => match ptype {
                PType::U16 => unsafe { mem::transmute::<f16, u16>(*v) }.into(),
                PType::I16 => unsafe { mem::transmute::<f16, i16>(*v) }.into(),
                _ => unreachable!("Only same width type are allowed to be reinterpreted"),
            },
            PValue::F32(v) => match ptype {
                PType::U32 => unsafe { mem::transmute::<f32, u32>(*v) }.into(),
                PType::I32 => unsafe { mem::transmute::<f32, i32>(*v) }.into(),
                _ => unreachable!("Only same width type are allowed to be reinterpreted"),
            },
            PValue::F64(v) => match ptype {
                PType::U64 => unsafe { mem::transmute::<f64, u64>(*v) }.into(),
                PType::I64 => unsafe { mem::transmute::<f64, i64>(*v) }.into(),
                _ => unreachable!("Only same width type are allowed to be reinterpreted"),
            },
        }
    }
}

macro_rules! int_pvalue {
    ($T:ty, $PT:tt) => {
        impl TryFrom<PValue> for $T {
            type Error = VortexError;

            fn try_from(value: PValue) -> Result<Self, Self::Error> {
                match value {
                    PValue::U8(v) => <$T as NumCast>::from(v),
                    PValue::U16(v) => <$T as NumCast>::from(v),
                    PValue::U32(v) => <$T as NumCast>::from(v),
                    PValue::U64(v) => <$T as NumCast>::from(v),
                    PValue::I8(v) => <$T as NumCast>::from(v),
                    PValue::I16(v) => <$T as NumCast>::from(v),
                    PValue::I32(v) => <$T as NumCast>::from(v),
                    PValue::I64(v) => <$T as NumCast>::from(v),
                    _ => None,
                }
                .ok_or_else(|| {
                    vortex_err!("Cannot read primitive value {:?} as {}", value, PType::$PT)
                })
            }
        }
    };
}

int_pvalue!(u8, U8);
int_pvalue!(u16, U16);
int_pvalue!(u32, U32);
int_pvalue!(u64, U64);
int_pvalue!(i8, I8);
int_pvalue!(i16, I16);
int_pvalue!(i32, I32);
int_pvalue!(i64, I64);

macro_rules! float_pvalue {
    ($T:ty, $PT:tt) => {
        impl TryFrom<PValue> for $T {
            type Error = VortexError;

            fn try_from(value: PValue) -> Result<Self, Self::Error> {
                match value {
                    PValue::F16(f) => <$T as NumCast>::from(f),
                    PValue::F32(f) => <$T as NumCast>::from(f),
                    PValue::F64(f) => <$T as NumCast>::from(f),
                    _ => None,
                }
                .ok_or_else(|| {
                    vortex_err!("Cannot read primitive value {:?} as {}", value, PType::$PT)
                })
            }
        }
    };
}

float_pvalue!(f32, F32);
float_pvalue!(f64, F64);

impl TryFrom<PValue> for f16 {
    type Error = VortexError;

    fn try_from(value: PValue) -> Result<Self, Self::Error> {
        // We serialize f16 as u16.
        match value {
            PValue::U16(u) => Some(Self::from_bits(u)),
            PValue::F32(f) => <Self as NumCast>::from(f),
            PValue::F64(f) => <Self as NumCast>::from(f),
            _ => None,
        }
        .ok_or_else(|| vortex_err!("Cannot read primitive value {:?} as {}", value, PType::F16))
    }
}

macro_rules! impl_pvalue {
    ($T:ty, $PT:tt) => {
        impl From<$T> for PValue {
            fn from(value: $T) -> Self {
                PValue::$PT(value)
            }
        }
    };
}

impl_pvalue!(u8, U8);
impl_pvalue!(u16, U16);
impl_pvalue!(u32, U32);
impl_pvalue!(u64, U64);
impl_pvalue!(i8, I8);
impl_pvalue!(i16, I16);
impl_pvalue!(i32, I32);
impl_pvalue!(i64, I64);
impl_pvalue!(f16, F16);
impl_pvalue!(f32, F32);
impl_pvalue!(f64, F64);