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use vortex_error::{vortex_err, vortex_panic, VortexResult};
use vortex_scalar::Scalar;

use crate::array::ChunkedArray;
use crate::compute::unary::{scalar_at, scalar_at_unchecked, ScalarAtFn};

impl ScalarAtFn for ChunkedArray {
    fn scalar_at(&self, index: usize) -> VortexResult<Scalar> {
        let (chunk_index, chunk_offset) = self.find_chunk_idx(index);
        scalar_at(
            &self
                .chunk(chunk_index)
                .ok_or_else(|| vortex_err!(OutOfBounds: chunk_index, 0, self.nchunks()))?,
            chunk_offset,
        )
    }

    fn scalar_at_unchecked(&self, index: usize) -> Scalar {
        let (chunk_index, chunk_offset) = self.find_chunk_idx(index);
        scalar_at_unchecked(
            &self
                .chunk(chunk_index)
                .unwrap_or_else(|| vortex_panic!(OutOfBounds: chunk_index, 0, self.nchunks())),
            chunk_offset,
        )
    }
}

#[cfg(test)]
mod tests {
    use vortex_dtype::{DType, Nullability, PType};

    use crate::array::{ChunkedArray, PrimitiveArray};
    use crate::compute::unary::scalar_at;
    use crate::IntoArray;

    #[test]
    fn empty_children_both_sides() {
        let array = ChunkedArray::try_new(
            vec![
                PrimitiveArray::from(Vec::<u64>::new()).into_array(),
                PrimitiveArray::from(Vec::<u64>::new()).into_array(),
                PrimitiveArray::from(vec![1u64, 2]).into_array(),
                PrimitiveArray::from(Vec::<u64>::new()).into_array(),
                PrimitiveArray::from(Vec::<u64>::new()).into_array(),
            ],
            DType::Primitive(PType::U64, Nullability::NonNullable),
        )
        .unwrap();
        assert_eq!(scalar_at(array.as_ref(), 0).unwrap(), 1u64.into());
        assert_eq!(scalar_at(array.as_ref(), 1).unwrap(), 2u64.into());
    }

    #[test]
    fn empty_children_trailing() {
        let array = ChunkedArray::try_new(
            vec![
                PrimitiveArray::from(vec![1u64, 2]).into_array(),
                PrimitiveArray::from(Vec::<u64>::new()).into_array(),
                PrimitiveArray::from(Vec::<u64>::new()).into_array(),
                PrimitiveArray::from(vec![3u64, 4]).into_array(),
            ],
            DType::Primitive(PType::U64, Nullability::NonNullable),
        )
        .unwrap();
        assert_eq!(scalar_at(array.as_ref(), 0).unwrap(), 1u64.into());
        assert_eq!(scalar_at(array.as_ref(), 1).unwrap(), 2u64.into());
        assert_eq!(scalar_at(array.as_ref(), 2).unwrap(), 3u64.into());
        assert_eq!(scalar_at(array.as_ref(), 3).unwrap(), 4u64.into());
    }

    #[test]
    fn empty_children_leading() {
        let array = ChunkedArray::try_new(
            vec![
                PrimitiveArray::from(Vec::<u64>::new()).into_array(),
                PrimitiveArray::from(Vec::<u64>::new()).into_array(),
                PrimitiveArray::from(vec![1u64, 2]).into_array(),
                PrimitiveArray::from(vec![3u64, 4]).into_array(),
            ],
            DType::Primitive(PType::U64, Nullability::NonNullable),
        )
        .unwrap();
        assert_eq!(scalar_at(array.as_ref(), 0).unwrap(), 1u64.into());
        assert_eq!(scalar_at(array.as_ref(), 1).unwrap(), 2u64.into());
        assert_eq!(scalar_at(array.as_ref(), 2).unwrap(), 3u64.into());
        assert_eq!(scalar_at(array.as_ref(), 3).unwrap(), 4u64.into());
    }
}