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use crate::memory_address::MemoryAddress;
use std::alloc::{Alloc, AllocErr, CannotReallocInPlace, Excess, GlobalAlloc, Layout};
use std::ops::Deref;

use crate::allocators::allocator::Allocator;

use std::num::NonZeroUsize;

/// Adapts an `Allocator` to the `GlobalAlloc` and `Alloc` traits.
#[repr(transparent)]
#[derive(Debug)]
pub struct AllocatorAdaptor<'a, A: 'a + Allocator>(pub(crate) &'a A);

impl<'a, A: 'a + Allocator> Deref for AllocatorAdaptor<'a, A> {
    type Target = A;

    #[inline(always)]
    fn deref(&self) -> &Self::Target {
        self.0
    }
}

unsafe impl<'a, A: 'a + Allocator> GlobalAlloc for AllocatorAdaptor<'a, A> {
    #[inline(always)]
    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
        self.global_alloc_alloc(layout)
    }

    #[inline(always)]
    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
        self.global_alloc_alloc_zeroed(layout)
    }

    #[inline(always)]
    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
        self.global_alloc_dealloc(ptr, layout)
    }

    #[inline(always)]
    unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
        self.global_alloc_realloc(ptr, layout, new_size)
    }
}

unsafe impl<'a, A: 'a + Allocator> Alloc for AllocatorAdaptor<'a, A> {
    #[inline(always)]
    unsafe fn alloc(&mut self, layout: Layout) -> Result<MemoryAddress, AllocErr> {
        self.alloc_alloc(layout)
    }

    #[inline(always)]
    unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<MemoryAddress, AllocErr> {
        self.alloc_alloc_zeroed(layout)
    }

    #[inline(always)]
    unsafe fn dealloc(&mut self, ptr: MemoryAddress, layout: Layout) {
        self.alloc_dealloc(ptr, layout)
    }

    #[inline(always)]
    unsafe fn realloc(
        &mut self,
        ptr: MemoryAddress,
        layout: Layout,
        new_size: usize,
    ) -> Result<MemoryAddress, AllocErr> {
        self.alloc_realloc(ptr, layout, new_size)
    }

    #[inline(always)]
    unsafe fn alloc_excess(&mut self, layout: Layout) -> Result<Excess, AllocErr> {
        self.alloc_alloc_excess(layout)
    }

    #[inline(always)]
    unsafe fn realloc_excess(
        &mut self,
        ptr: MemoryAddress,
        layout: Layout,
        new_size: usize,
    ) -> Result<Excess, AllocErr> {
        self.alloc_realloc_excess(ptr, layout, new_size)
    }

    #[inline(always)]
    unsafe fn grow_in_place(
        &mut self,
        ptr: MemoryAddress,
        layout: Layout,
        new_size: usize,
    ) -> Result<(), CannotReallocInPlace> {
        self.alloc_grow_in_place(ptr, layout, new_size)
    }

    #[inline(always)]
    unsafe fn shrink_in_place(
        &mut self,
        ptr: MemoryAddress,
        layout: Layout,
        new_size: usize,
    ) -> Result<(), CannotReallocInPlace> {
        self.alloc_shrink_in_place(ptr, layout, new_size)
    }
}

impl<'a, A: 'a + Allocator> Allocator for AllocatorAdaptor<'a, A> {
    #[inline(always)]
    fn allocate(
        &self,
        non_zero_size: NonZeroUsize,
        non_zero_power_of_two_alignment: NonZeroUsize,
    ) -> Result<MemoryAddress, AllocErr> {
        self.0
            .allocate(non_zero_size, non_zero_power_of_two_alignment)
    }

    #[inline(always)]
    fn deallocate(
        &self,
        non_zero_size: NonZeroUsize,
        non_zero_power_of_two_alignment: NonZeroUsize,
        current_memory: MemoryAddress,
    ) {
        self.0.deallocate(
            non_zero_size,
            non_zero_power_of_two_alignment,
            current_memory,
        )
    }

    #[inline(always)]
    fn growing_reallocate(
        &self,
        non_zero_new_size: NonZeroUsize,
        non_zero_power_of_two_alignment: NonZeroUsize,
        non_zero_current_size: NonZeroUsize,
        current_memory: MemoryAddress,
    ) -> Result<MemoryAddress, AllocErr> {
        self.0.growing_reallocate(
            non_zero_new_size,
            non_zero_power_of_two_alignment,
            non_zero_current_size,
            current_memory,
        )
    }

    #[inline(always)]
    fn shrinking_reallocate(
        &self,
        non_zero_new_size: NonZeroUsize,
        non_zero_power_of_two_alignment: NonZeroUsize,
        non_zero_current_size: NonZeroUsize,
        current_memory: MemoryAddress,
    ) -> Result<MemoryAddress, AllocErr> {
        self.0.shrinking_reallocate(
            non_zero_new_size,
            non_zero_power_of_two_alignment,
            non_zero_current_size,
            current_memory,
        )
    }
}