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use crate::prelude::*;

pub struct ThinPtrArray<'a, L, E>
where
    Self: 'a,
{
    data: ManuallyDrop<&'a mut TPArrayBlock<L, E>>,
}

impl<'a, L, E> ThinPtrArray<'a, L, E> {
    /// Create a new array, with values initialized using a provided function.
    #[inline]
    pub fn new<F>(label: L, len: usize, func: F) -> Self
    where
        F: FnMut(&mut L, usize) -> E,
    {
        Self {
            data: ManuallyDrop::new(TPArrayBlock::<L, E>::new_ptr(label, len, func)),
        }
    }

    /// Create a new array, without initializing the values in it.
    #[inline]
    pub unsafe fn new_unsafe(label: L, len: usize) -> Self {
        let new_ptr = TPArrayBlock::<L, E>::new_ptr_unsafe(label, len);
        Self {
            data: ManuallyDrop::new(new_ptr),
        }
    }

    /// Unsafe access to an element at an index in the array.
    #[inline]
    pub unsafe fn unchecked_access(&'a self, idx: usize) -> &'a mut E {
        self.data.unchecked_access(idx)
    }
}

impl<'a, L, E> ThinPtrArray<'a, L, E>
where
    E: Default,
{
    /// Get a new array, initialized to default values.
    #[inline]
    pub fn new_default(label: L, len: usize) -> Self {
        Self {
            data: ManuallyDrop::new(TPArrayBlock::new_ptr_default(label, len)),
        }
    }
}

impl<'a, L, E> LabelledArray<L, E> for ThinPtrArray<'a, L, E> {
    /// Get a reference to the label of the array.
    #[inline]
    fn get_label(&self) -> &L {
        &self.data.label
    }

    /// Get a mutable reference to the label of the array.
    #[inline]
    fn get_label_mut(&mut self) -> &mut L {
        &mut self.data.label
    }
}

impl<'a, L, E> Index<usize> for ThinPtrArray<'a, L, E> {
    type Output = E;
    #[inline]
    fn index(&self, idx: usize) -> &E {
        &self.data[idx]
    }
}

impl<'a, L, E> IndexMut<usize> for ThinPtrArray<'a, L, E> {
    #[inline]
    fn index_mut(&mut self, idx: usize) -> &mut E {
        &mut self.data[idx]
    }
}

impl<'a, L, E> Clone for ThinPtrArray<'a, L, E>
where
    L: Clone,
    E: Clone,
{
    #[inline]
    fn clone(&self) -> Self {
        Self {
            data: ManuallyDrop::new((*self.data).clone()),
        }
    }
}

impl<'a, L, E> Drop for ThinPtrArray<'a, L, E> {
    #[inline]
    fn drop(&mut self) {
        let mut_ref = &mut self.data;
        unsafe { mut_ref.dealloc() };
        core::mem::forget(mut_ref);
    }
}

impl<'a, L, E> Container<(usize, E)> for ThinPtrArray<'a, L, E> {
    #[inline]
    fn add(&mut self, elem: (usize, E)) {
        self[elem.0] = elem.1;
    }
    #[inline]
    fn len(&self) -> usize {
        self.data.len()
    }
}

impl<'a, L, E> CopyMap<usize, E> for ThinPtrArray<'a, L, E> {
    #[inline]
    fn get(&self, key: usize) -> Option<&E> {
        if key > self.len() {
            None
        } else {
            Some(&self[key])
        }
    }
    #[inline]
    fn get_mut(&mut self, key: usize) -> Option<&mut E> {
        if key > self.len() {
            None
        } else {
            Some(&mut self[key])
        }
    }
    #[inline]
    fn insert(&mut self, key: usize, value: E) -> Option<E> {
        if key > self.len() {
            None
        } else {
            let ret = unsafe { std::mem::transmute_copy::<E, E>(&self[key]) };
            let value_ref = (&mut self[key]) as *mut E as *mut ManuallyDrop<E>;
            unsafe {
                *value_ref = ManuallyDrop::new(value);
            }
            Some(ret)
        }
    }
}

impl<'a, L, E> Array<E> for ThinPtrArray<'a, L, E> {}