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use super::Array;
use crate::{
    bitmap::{Bitmap, BitmapRef, BitmapRefMut, ValidityBitmap},
    buffer::{BufferType, VecBuffer},
    validity::Validity,
    FixedSize, Length,
};

/// Array with primitive values.
pub struct FixedSizePrimitiveArray<
    T: FixedSize,
    const NULLABLE: bool = false,
    Buffer: BufferType = VecBuffer,
>(pub <<Buffer as BufferType>::Buffer<T> as Validity<NULLABLE>>::Storage<Buffer>)
where
    <Buffer as BufferType>::Buffer<T>: Validity<NULLABLE>;

macro_rules! type_def {
    ($ident:ident, $ty:ty) => {
        #[doc = "Array with ["]
        #[doc = stringify!($ty)]
        #[doc = "] values."]
        pub type $ident<const NULLABLE: bool = false, Buffer = VecBuffer> =
            FixedSizePrimitiveArray<$ty, NULLABLE, Buffer>;
    };
}

type_def!(Int8Array, i8);
type_def!(Int16Array, i16);
type_def!(Int32Array, i32);
type_def!(Int64Array, i64);
type_def!(Uint8Array, u8);
type_def!(Uint16Array, u16);
type_def!(Uint32Array, u32);
type_def!(Uint64Array, u64);

type_def!(IsizeArray, isize);
type_def!(UsizeArray, usize);

type_def!(Float32Array, f32);
type_def!(Float64Array, f64);

impl<T: FixedSize, const NULLABLE: bool, Buffer: BufferType> Array
    for FixedSizePrimitiveArray<T, NULLABLE, Buffer>
where
    <Buffer as BufferType>::Buffer<T>: Validity<NULLABLE>,
{
}

impl<T: FixedSize, const NULLABLE: bool, Buffer: BufferType> Default
    for FixedSizePrimitiveArray<T, NULLABLE, Buffer>
where
    <Buffer as BufferType>::Buffer<T>: Validity<NULLABLE>,
    <<Buffer as BufferType>::Buffer<T> as Validity<NULLABLE>>::Storage<Buffer>: Default,
{
    fn default() -> Self {
        Self(Default::default())
    }
}

impl<T: FixedSize, U, const NULLABLE: bool, Buffer: BufferType> Extend<U>
    for FixedSizePrimitiveArray<T, NULLABLE, Buffer>
where
    <Buffer as BufferType>::Buffer<T>: Validity<NULLABLE>,
    <<Buffer as BufferType>::Buffer<T> as Validity<NULLABLE>>::Storage<Buffer>: Extend<U>,
{
    fn extend<I: IntoIterator<Item = U>>(&mut self, iter: I) {
        self.0.extend(iter)
    }
}

impl<T: FixedSize, const NULLABLE: bool, U, Buffer: BufferType> FromIterator<U>
    for FixedSizePrimitiveArray<T, NULLABLE, Buffer>
where
    <Buffer as BufferType>::Buffer<T>: Validity<NULLABLE>,
    <<Buffer as BufferType>::Buffer<T> as Validity<NULLABLE>>::Storage<Buffer>: FromIterator<U>,
{
    fn from_iter<I: IntoIterator<Item = U>>(iter: I) -> Self {
        Self(iter.into_iter().collect())
    }
}

impl<'a, T: FixedSize, const NULLABLE: bool, Buffer: BufferType> IntoIterator
    for &'a FixedSizePrimitiveArray<T, NULLABLE, Buffer>
where
    <Buffer as BufferType>::Buffer<T>: Validity<NULLABLE>,
    &'a <<Buffer as BufferType>::Buffer<T> as Validity<NULLABLE>>::Storage<Buffer>: IntoIterator,
{
    type Item = <&'a <<Buffer as BufferType>::Buffer<T> as Validity<NULLABLE>>::Storage<Buffer> as IntoIterator>::Item;
    type IntoIter = <&'a <<Buffer as BufferType>::Buffer<T> as Validity<NULLABLE>>::Storage<Buffer> as IntoIterator>::IntoIter;

    fn into_iter(self) -> Self::IntoIter {
        self.0.into_iter()
    }
}

impl<T: FixedSize, const NULLABLE: bool, Buffer: BufferType> IntoIterator
    for FixedSizePrimitiveArray<T, NULLABLE, Buffer>
where
    <Buffer as BufferType>::Buffer<T>: Validity<NULLABLE>,
    <<Buffer as BufferType>::Buffer<T> as Validity<NULLABLE>>::Storage<Buffer>: IntoIterator,
{
    type Item = <<<Buffer as BufferType>::Buffer<T> as Validity<NULLABLE>>::Storage<Buffer> as IntoIterator>::Item;
    type IntoIter = <<<Buffer as BufferType>::Buffer<T> as Validity<NULLABLE>>::Storage<Buffer> as IntoIterator>::IntoIter;

    fn into_iter(self) -> Self::IntoIter {
        self.0.into_iter()
    }
}

impl<T: FixedSize, const NULLABLE: bool, Buffer: BufferType> Length
    for FixedSizePrimitiveArray<T, NULLABLE, Buffer>
where
    <Buffer as BufferType>::Buffer<T>: Validity<NULLABLE>,
    <<Buffer as BufferType>::Buffer<T> as Validity<NULLABLE>>::Storage<Buffer>: Length,
{
    #[inline]
    fn len(&self) -> usize {
        self.0.len()
    }
}

impl<T: FixedSize, Buffer: BufferType> BitmapRef for FixedSizePrimitiveArray<T, true, Buffer> {
    type Buffer = Buffer;

    fn bitmap_ref(&self) -> &Bitmap<Self::Buffer> {
        self.0.bitmap_ref()
    }
}

impl<T: FixedSize, Buffer: BufferType> BitmapRefMut for FixedSizePrimitiveArray<T, true, Buffer> {
    fn bitmap_ref_mut(&mut self) -> &mut Bitmap<Self::Buffer> {
        self.0.bitmap_ref_mut()
    }
}

impl<T: FixedSize, Buffer: BufferType> ValidityBitmap for FixedSizePrimitiveArray<T, true, Buffer> {}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::{
        bitmap::Bitmap,
        buffer::{Buffer, BufferRef},
    };
    use std::mem;

    #[test]
    fn from_iter() {
        let input = [1u8, 2, 3, 4];
        let array = input.into_iter().collect::<FixedSizePrimitiveArray<_>>();
        assert_eq!(array.0.as_slice(), &[1, 2, 3, 4]);
        assert_eq!(array.0.as_slice(), array.0.as_bytes());

        let input = [[1u8, 2], [3, 4]];
        let array = input.into_iter().collect::<FixedSizePrimitiveArray<_>>();
        assert_eq!(array.0.as_slice(), &[[1, 2], [3, 4]]);
        assert_eq!(<_ as Buffer<u8>>::as_bytes(&array.0), &[1, 2, 3, 4]);

        let input = [Some(1u64), None, Some(3), Some(4)];
        let array = input.iter().collect::<FixedSizePrimitiveArray<_, true>>();
        assert_eq!(array.0.buffer_ref().as_slice(), &[1, u64::default(), 3, 4]);
        assert_eq!(array.is_valid(0), Some(true));
        assert_eq!(array.is_null(1), Some(true));
        assert_eq!(array.is_valid(2), Some(true));
        assert_eq!(array.is_valid(3), Some(true));
        assert_eq!(array.is_valid(4), None);
    }

    #[test]
    fn into_iter() {
        let input = [1u8, 2, 3, 4];
        let array = input.into_iter().collect::<FixedSizePrimitiveArray<_>>();
        assert_eq!(array.into_iter().collect::<Vec<_>>(), input);

        let input = [[1u8, 2], [3, 4]];
        let array = input.into_iter().collect::<FixedSizePrimitiveArray<_>>();
        assert_eq!(array.into_iter().collect::<Vec<_>>(), input);

        let input = [Some(1u64), None, Some(3), Some(4)];
        let array = input.iter().collect::<FixedSizePrimitiveArray<_, true>>();
        assert_eq!(array.into_iter().collect::<Vec<_>>(), input);
    }

    #[test]
    fn length() {
        let input = [1u8, 2, 3, 4];
        let array = input.into_iter().collect::<FixedSizePrimitiveArray<_>>();
        assert_eq!(array.len(), input.as_slice().len());

        let input = [[1u8, 2], [3, 4]];
        let array = input.into_iter().collect::<FixedSizePrimitiveArray<_>>();
        assert_eq!(array.len(), input.as_slice().len());

        let input = [Some(1u64), None, Some(3), Some(4)];
        let array = input.iter().collect::<FixedSizePrimitiveArray<_, true>>();
        assert_eq!(array.len(), input.len());
    }

    #[test]
    fn size_of() {
        assert_eq!(mem::size_of::<Int8Array>(), mem::size_of::<Vec<i8>>());
        assert_eq!(
            std::mem::size_of::<Int8Array<true>>(),
            mem::size_of::<Int8Array>() + mem::size_of::<Bitmap>()
        );
    }
}