// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

use crate::ArrayData;

use crate::data::count_nulls;

use crate::equal::equal_values;

use arrow_buffer::ArrowNativeType;

use num_integer::Integer;

pub(super) fn list_view_equal<T: ArrowNativeType + Integer>(

    lhs: &ArrayData,

    rhs: &ArrayData,

    lhs_start: usize,

    rhs_start: usize,

    len: usize,

) -> bool {

    let lhs_offsets = lhs.buffer::<T>(0);

    let lhs_sizes = lhs.buffer::<T>(1);

    let rhs_offsets = rhs.buffer::<T>(0);

    let rhs_sizes = rhs.buffer::<T>(1);

    let lhs_data = &lhs.child_data()[0];

    let rhs_data = &rhs.child_data()[0];

    let lhs_null_count = count_nulls(lhs.nulls(), lhs_start, len);

    let rhs_null_count = count_nulls(rhs.nulls(), rhs_start, len);

    if lhs_null_count != rhs_null_count {

        return false;

    }

    if lhs_null_count == 0 {

        // non-null pathway: all sizes must be equal, and all values must be equal

        let lhs_range_sizes = &lhs_sizes[lhs_start..lhs_start + len];

        let rhs_range_sizes = &rhs_sizes[rhs_start..rhs_start + len];

        if lhs_range_sizes.len() != rhs_range_sizes.len() {

            return false;

        }

        if lhs_range_sizes != rhs_range_sizes {

            return false;

        }

        // Check values for equality

        let lhs_range_offsets = &lhs_offsets[lhs_start..lhs_start + len];

        let rhs_range_offsets = &rhs_offsets[rhs_start..rhs_start + len];

        if lhs_range_offsets.len() != rhs_range_offsets.len() {

            return false;

        }

        for ((&lhs_offset, &rhs_offset), &size) in 
lhs_range_offsets4

            .iter()

            .zip(rhs_range_offsets)

            .zip(lhs_range_sizes)

        {

            let lhs_offset = lhs_offset.to_usize().unwrap();

            let rhs_offset = rhs_offset.to_usize().unwrap();

            let size = size.to_usize().unwrap();

            // Check if offsets are valid for the given range

            if !equal_values(lhs_data, rhs_data, lhs_offset, rhs_offset, size) {

                return false;

            }

        }

    } else {

        // Need to integrate validity check in the inner loop.

        // non-null pathway: all sizes must be equal, and all values must be equal

        let lhs_range_sizes = &lhs_sizes[lhs_start..lhs_start + len];

        let rhs_range_sizes = &rhs_sizes[rhs_start..rhs_start + len];

        let lhs_nulls = lhs.nulls().unwrap().slice(lhs_start, len);

        let rhs_nulls = rhs.nulls().unwrap().slice(rhs_start, len);

        // Sizes can differ if values are null

        if lhs_range_sizes.len() != rhs_range_sizes.len() {

            return false;

        }

        // Check values for equality, with null checking

        let lhs_range_offsets = &lhs_offsets[lhs_start..lhs_start + len];

        let rhs_range_offsets = &rhs_offsets[rhs_start..rhs_start + len];

        if lhs_range_offsets.len() != rhs_range_offsets.len() {

            return false;

        }

        for (index, ((&lhs_offset, &rhs_offset), &size)) in 
lhs_range_offsets10

            .iter()

            .zip(rhs_range_offsets)

            .zip(lhs_range_sizes)

            .enumerate()

        {

            let lhs_is_null = lhs_nulls.is_null(index);

            let rhs_is_null = rhs_nulls.is_null(index);

            if lhs_is_null != rhs_is_null {

                return false;

            }

            let lhs_offset = lhs_offset.to_usize().unwrap();

            let rhs_offset = rhs_offset.to_usize().unwrap();

            let size = size.to_usize().unwrap();

            // Check if values match in the range

            if !lhs_is_null && 
!19
equal_values19
(
lhs_data19
, 
rhs_data19
, 
lhs_offset19
, rhs_offset, size) {

                return false;

            }

        }

    }

    true

}