// 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::data::{ArrayData, contains_nulls};

use super::equal_range;

/// Compares the values of two [ArrayData] starting at `lhs_start` and `rhs_start` respectively

/// for `len` slots.

fn equal_child_values(

    lhs: &ArrayData,

    rhs: &ArrayData,

    lhs_start: usize,

    rhs_start: usize,

    len: usize,

) -> bool {

    lhs.child_data()

        .iter()

        .zip(rhs.child_data())

        .
all18
(|(lhs_values, rhs_values)| {

            equal_range(lhs_values, rhs_values, lhs_start, rhs_start, len)

        })

}

pub(super) fn struct_equal(

    lhs: &ArrayData,

    rhs: &ArrayData,

    lhs_start: usize,

    rhs_start: usize,

    len: usize,

) -> bool {

    // Only checking one null mask here because by the time the control flow reaches

    // this point, the equality of the two masks would have already been verified.

    if !contains_nulls(lhs.nulls(), lhs_start, len) {

        equal_child_values(lhs, rhs, lhs_start, rhs_start, len)

    } else {

        // get a ref of the null buffer bytes, to use in testing for nullness

        let lhs_nulls = lhs.nulls().unwrap();

        let rhs_nulls = rhs.nulls().unwrap();

        // with nulls, we need to compare item by item whenever it is not null

        
(0..len)6
.
all6
(|i| {

            let lhs_pos = lhs_start + i;

            let rhs_pos = rhs_start + i;

            // if both struct and child had no null buffers,

            let lhs_is_null = lhs_nulls.is_null(lhs_pos);

            let rhs_is_null = rhs_nulls.is_null(rhs_pos);

            if lhs_is_null != rhs_is_null {

                return false;

            }

            lhs_is_null || 
equal_child_values13
(
lhs13
, 
rhs13
, 
lhs_pos13
, 
rhs_pos13
, 1)

        })

    }

}