// 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.

// This file is copied from

// https://github.com/apache/impala/blob/branch-2.9.0/be/src/runtime/raw-value.h

// and modified by Doris

#pragma once

#include <string>

#include "common/consts.h"

#include "common/logging.h"

#include "runtime/types.h"

#include "util/hash_util.hpp"

#include "util/types.h"

#include "vec/common/string_ref.h"

namespace doris {

class SlotDescriptor;

// Useful utility functions for runtime values (which are passed around as void*).

class RawValue {

public:

    // Same as the up function, only use in vec exec engine.

    static uint32_t zlib_crc32(const void* value, size_t len, const PrimitiveType& type,

                               uint32_t seed);

};

// NOTE: this is just for split data, decimal use old doris hash function

// Because crc32 hardware is not equal with zlib crc32

inline uint32_t RawValue::zlib_crc32(const void* v, size_t len, const PrimitiveType& type,

                                     uint32_t seed) {

    // Hash_combine with v = 0

    if (v == nullptr) {

        uint32_t value = 0x9e3779b9;

        return seed ^ (value + (seed << 6) + (seed >> 2));

    }

    switch (type) {

    case TYPE_VARCHAR:

    case TYPE_HLL:

    case TYPE_STRING:

    case TYPE_CHAR: {

        return HashUtil::zlib_crc_hash(v, len, seed);

    }

    case TYPE_BOOLEAN:

    case TYPE_TINYINT:

        return HashUtil::zlib_crc_hash(v, 1, seed);

    case TYPE_SMALLINT:

        return HashUtil::zlib_crc_hash(v, 2, seed);

    case TYPE_INT:

        return HashUtil::zlib_crc_hash(v, 4, seed);

    case TYPE_BIGINT:

        return HashUtil::zlib_crc_hash(v, 8, seed);

    case TYPE_LARGEINT:

        return HashUtil::zlib_crc_hash(v, 16, seed);

    case TYPE_FLOAT:

        return HashUtil::zlib_crc_hash(v, 4, seed);

    case TYPE_DOUBLE:

        return HashUtil::zlib_crc_hash(v, 8, seed);

    case TYPE_DATE:

    case TYPE_DATETIME: {

        auto* date_val = (const VecDateTimeValue*)v;

        char buf[64];

        int len = date_val->to_buffer(buf);

        return HashUtil::zlib_crc_hash(buf, len, seed);

    }

    case TYPE_DATEV2: {

        return HashUtil::zlib_crc_hash(v, 4, seed);

    }

    case TYPE_DATETIMEV2: {

        return HashUtil::zlib_crc_hash(v, 8, seed);

    }

    case TYPE_DECIMALV2: {

        const DecimalV2Value* dec_val = (const DecimalV2Value*)v;

        int64_t int_val = dec_val->int_value();

        int32_t frac_val = dec_val->frac_value();

        seed = HashUtil::zlib_crc_hash(&int_val, sizeof(int_val), seed);

        return HashUtil::zlib_crc_hash(&frac_val, sizeof(frac_val), seed);

    }

    case TYPE_DECIMAL32:

        return HashUtil::zlib_crc_hash(v, 4, seed);

    case TYPE_DECIMAL64:

        return HashUtil::zlib_crc_hash(v, 8, seed);

    case TYPE_DECIMAL128I:

        return HashUtil::zlib_crc_hash(v, 16, seed);

    case TYPE_DECIMAL256:

        return HashUtil::zlib_crc_hash(v, 32, seed);

    default:

        DCHECK(false) << "invalid type: " << type;

        return 0;

    }

}

} // namespace doris