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use super::IntoRange;
use crate::prelude::*;
use std::{
    fmt::Debug,
    marker::PhantomData,
    ops::{Deref, DerefMut},
};

/// An immutable slice of a [`Buffer`]
#[cfg_attr(docsrs, doc(cfg(feature = "cl1_1")))]
#[repr(transparent)]
pub struct Buf<'a, T, C: Context = Global> {
    inner: Buffer<T, C>,
    phtm: PhantomData<&'a Buffer<T, C>>,
}

impl<'a, T, C: Context> Buf<'a, T, C> {
    #[inline]
    pub fn new<R: IntoRange>(parent: &'a Buffer<T, C>, range: R) -> Result<Self>
    where
        C: Clone,
    {
        if parent.associated_memobject()?.is_some() {
            return Err(Error::new(
                ErrorKind::InvalidMemObject,
                "cannot create slice of a slice",
            ));
        }

        let region = range.into_range::<T>(parent)?;
        let inner = unsafe { parent.create_sub_buffer(MemAccess::READ_ONLY, region)? };

        return Ok(Self {
            inner: Buffer {
                inner,
                ctx: parent.ctx.clone(),
                phtm: PhantomData,
            },
            phtm: PhantomData,
        });
    }

    #[inline]
    pub unsafe fn from_raw<R: IntoRange>(parent: &RawBuffer, range: R, ctx: C) -> Result<Self> {
        if parent.associated_memobject()?.is_some() {
            return Err(Error::new(
                ErrorKind::InvalidMemObject,
                "cannot create slice of slice",
            ));
        }

        let region = range.into_range::<T>(parent)?;
        let inner = unsafe { parent.create_sub_buffer(MemAccess::READ_ONLY, region)? };

        return Ok(Self {
            inner: Buffer {
                inner,
                ctx,
                phtm: PhantomData,
            },
            phtm: PhantomData,
        });
    }
}

impl<'a, T, C: Context> Deref for Buf<'a, T, C> {
    type Target = Buffer<T, C>;

    #[inline(always)]
    fn deref(&self) -> &Self::Target {
        &self.inner
    }
}

impl<T: Debug, C: Context> Debug for Buf<'_, T, C> {
    #[inline(always)]
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        self.inner.fmt(f)
    }
}

impl<T: PartialEq, C: Context> PartialEq for Buf<'_, T, C> {
    #[inline(always)]
    fn eq(&self, other: &Self) -> bool {
        self.inner.eq(other)
    }
}

impl<T: Eq, C: Context> Eq for Buf<'_, T, C> {}

/// A mutable slice of a [`Buffer`]
#[cfg_attr(docsrs, doc(cfg(feature = "cl1_1")))]
#[repr(transparent)]
pub struct BufMut<'a, T, C: Context = Global> {
    inner: Buffer<T, C>,
    phtm: PhantomData<&'a mut Buffer<T, C>>,
}

impl<'a, T, C: Context> BufMut<'a, T, C> {
    #[inline]
    pub fn new<R: IntoRange>(parent: &'a mut Buffer<T, C>, range: R) -> Result<Self>
    where
        C: Clone,
    {
        if parent.associated_memobject()?.is_some() {
            return Err(Error::new(
                ErrorKind::InvalidMemObject,
                "cannot create slice of slice",
            ));
        }

        let region = range.into_range::<T>(parent)?;
        let inner = unsafe { parent.create_sub_buffer(MemAccess::READ_WRITE, region)? };

        return Ok(Self {
            inner: Buffer {
                inner,
                ctx: parent.ctx.clone(),
                phtm: PhantomData,
            },
            phtm: PhantomData,
        });
    }

    #[inline]
    pub unsafe fn from_raw<R: IntoRange>(parent: &RawBuffer, range: R, ctx: C) -> Result<Self> {
        if parent.associated_memobject()?.is_some() {
            return Err(Error::new(
                ErrorKind::InvalidMemObject,
                "cannot create slice of slice",
            ));
        }

        let region = range.into_range::<T>(parent)?;
        let inner = unsafe { parent.create_sub_buffer(MemAccess::READ_WRITE, region)? };

        return Ok(Self {
            inner: Buffer {
                inner,
                ctx,
                phtm: PhantomData,
            },
            phtm: PhantomData,
        });
    }
}

impl<'a, T, C: Context> Deref for BufMut<'a, T, C> {
    type Target = Buffer<T, C>;

    #[inline(always)]
    fn deref(&self) -> &Self::Target {
        &self.inner
    }
}

impl<'a, T, C: Context> DerefMut for BufMut<'a, T, C> {
    #[inline(always)]
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.inner
    }
}

impl<T: Debug, C: Context> Debug for BufMut<'_, T, C> {
    #[inline(always)]
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        self.inner.fmt(f)
    }
}

impl<T: PartialEq, C: Context> PartialEq for BufMut<'_, T, C> {
    #[inline(always)]
    fn eq(&self, other: &Self) -> bool {
        self.inner.eq(other)
    }
}

impl<T: Eq, C: Context> Eq for BufMut<'_, T, C> {}