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use arrow::array::{Array, ArrayData, ArrayDataRef, ArrayRef, ListArray, PrimitiveArray};
use arrow::datatypes::{ArrowPrimitiveType, DataType};
use num::Num;

pub trait GetValues {
    fn get_values<T>(&self) -> &[T::Native]
    where
        T: ArrowPrimitiveType,
        T::Native: Num;
}

impl GetValues for ArrayDataRef {
    fn get_values<T>(&self) -> &[T::Native]
    where
        T: ArrowPrimitiveType,
        T::Native: Num,
    {
        debug_assert_eq!(&T::DATA_TYPE, self.data_type());
        // the first buffer is the value array
        let value_buf = &self.buffers()[0];
        let offset = self.offset();
        let vals = unsafe { value_buf.typed_data::<T::Native>() };
        &vals[offset..offset + self.len()]
    }
}

impl GetValues for &dyn Array {
    fn get_values<T>(&self) -> &[T::Native]
    where
        T: ArrowPrimitiveType,
        T::Native: Num,
    {
        self.data_ref().get_values::<T>()
    }
}

impl GetValues for ArrayRef {
    fn get_values<T>(&self) -> &[T::Native]
    where
        T: ArrowPrimitiveType,
        T::Native: Num,
    {
        self.data_ref().get_values::<T>()
    }
}

pub trait ToPrimitive {
    fn into_primitive_array<T>(self) -> PrimitiveArray<T>
    where
        T: ArrowPrimitiveType;
}

impl ToPrimitive for ArrayDataRef {
    fn into_primitive_array<T>(self) -> PrimitiveArray<T>
    where
        T: ArrowPrimitiveType,
    {
        PrimitiveArray::from(self)
    }
}

impl ToPrimitive for &dyn Array {
    fn into_primitive_array<T>(self) -> PrimitiveArray<T>
    where
        T: ArrowPrimitiveType,
    {
        self.data().into_primitive_array()
    }
}

pub trait ValueSize {
    /// Useful for a Utf8 or a List to get underlying value size.
    /// During a rechunk this is handy
    fn get_values_size(&self) -> usize;
}

impl ValueSize for ArrayRef {
    fn get_values_size(&self) -> usize {
        self.data_ref().get_values_size()
    }
}

impl ValueSize for ArrayData {
    fn get_values_size(&self) -> usize {
        match self.data_type() {
            DataType::LargeList(_) | DataType::List(_) => {
                self.child_data()[0].len() - self.offset()
            }
            DataType::LargeUtf8 | DataType::Utf8 => self.buffers()[1].len() - self.offset(),
            _ => unimplemented!(),
        }
    }
}

impl ValueSize for ListArray {
    fn get_values_size(&self) -> usize {
        self.data_ref().get_values_size()
    }
}