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use crate::{
    array::{FromFfi, ToFfi},
    bitmap::align,
    ffi,
    types::NativeType,
};

use crate::error::Result;

use super::PrimitiveArray;

unsafe impl<T: NativeType> ToFfi for PrimitiveArray<T> {
    fn buffers(&self) -> Vec<Option<*const u8>> {
        vec![
            self.validity.as_ref().map(|x| x.as_ptr()),
            Some(self.values.as_ptr().cast::<u8>()),
        ]
    }

    fn offset(&self) -> Option<usize> {
        let offset = self.values.offset();
        if let Some(bitmap) = self.validity.as_ref() {
            if bitmap.offset() == offset {
                Some(offset)
            } else {
                None
            }
        } else {
            Some(offset)
        }
    }

    fn to_ffi_aligned(&self) -> Self {
        let offset = self.values.offset();

        let validity = self.validity.as_ref().map(|bitmap| {
            if bitmap.offset() == offset {
                bitmap.clone()
            } else {
                align(bitmap, offset)
            }
        });

        Self {
            data_type: self.data_type.clone(),
            validity,
            values: self.values.clone(),
        }
    }
}

impl<T: NativeType, A: ffi::ArrowArrayRef> FromFfi<A> for PrimitiveArray<T> {
    unsafe fn try_from_ffi(array: A) -> Result<Self> {
        let data_type = array.data_type().clone();
        let validity = unsafe { array.validity() }?;
        let values = unsafe { array.buffer::<T>(1) }?;

        Self::try_new(data_type, values, validity)
    }
}