// 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.

#pragma once

#include <variant>

#include <vector>

#include "core/column/column.h"

#include "core/data_type/data_type.h"

#include "core/data_type/data_type_nullable.h"

#include "core/data_type/data_type_string.h"

#include "exec/common/hash_table/hash.h"

#include "exec/common/hash_table/hash_map_context.h"

#include "exec/common/hash_table/hash_map_util.h"

#include "exec/common/hash_table/ph_hash_map.h"

#include "exec/common/hash_table/string_hash_map.h"

namespace doris {

// key -> column index

template <typename KeyType>

using DictHashMap = PHHashMap<KeyType, IColumn::ColumnIndex, HashCRC32<KeyType>>;

using DictHashMapVariants = std::variant<

        std::monostate,

        MethodSerialized<StringHashMap<IColumn::ColumnIndex>>,

        MethodStringNoCache<StringHashMap<IColumn::ColumnIndex>>,

        MethodOneNumber<UInt8, DictHashMap<UInt8>>, MethodOneNumber<UInt16, DictHashMap<UInt16>>,

        MethodOneNumber<UInt32, DictHashMap<UInt32>>, MethodOneNumber<UInt64, DictHashMap<UInt64>>,

        MethodOneNumber<UInt128, DictHashMap<UInt128>>,

        MethodOneNumber<UInt256, DictHashMap<UInt256>>,

        MethodKeysFixed<DictHashMap<UInt64>>, MethodKeysFixed<DictHashMap<UInt72>>,

        MethodKeysFixed<DictHashMap<UInt96>>, MethodKeysFixed<DictHashMap<UInt104>>,

        MethodKeysFixed<DictHashMap<UInt128>>, MethodKeysFixed<DictHashMap<UInt136>>,

        MethodKeysFixed<DictHashMap<UInt256>>>;

struct DictionaryHashMapMethod

        : public DataVariants<DictHashMapVariants, MethodSingleNullableColumn, MethodOneNumber,

                              DataWithNullKey> {

    void init(const std::vector<DataTypePtr>& data_types, HashKeyType type) {

        switch (type) {

        case HashKeyType::serialized:

            method_variant.emplace<MethodSerialized<StringHashMap<IColumn::ColumnIndex>>>();

            break;

        // Here we do not call emplace_single because we do not have a corresponding nullable type

        case HashKeyType::int8_key:

            method_variant.emplace<MethodOneNumber<UInt8, DictHashMap<UInt8>>>();

            break;

        case HashKeyType::int16_key:

            method_variant.emplace<MethodOneNumber<UInt16, DictHashMap<UInt16>>>();

            break;

        case HashKeyType::int32_key:

            method_variant.emplace<MethodOneNumber<UInt32, DictHashMap<UInt32>>>();

            break;

        case HashKeyType::int64_key:

            method_variant.emplace<MethodOneNumber<UInt64, DictHashMap<UInt64>>>();

            break;

        case HashKeyType::int128_key:

            method_variant.emplace<MethodOneNumber<UInt128, DictHashMap<UInt128>>>();

            break;

        case HashKeyType::int256_key:

            method_variant.emplace<MethodOneNumber<UInt256, DictHashMap<UInt256>>>();

            break;

        case HashKeyType::string_key:

            method_variant.emplace<MethodStringNoCache<StringHashMap<IColumn::ColumnIndex>>>();

            break;

        case HashKeyType::fixed64:

            method_variant.emplace<MethodKeysFixed<DictHashMap<UInt64>>>(get_key_sizes(data_types));

            break;

        case HashKeyType::fixed72:

            method_variant.emplace<MethodKeysFixed<DictHashMap<UInt72>>>(get_key_sizes(data_types));

            break;

        case HashKeyType::fixed96:

            method_variant.emplace<MethodKeysFixed<DictHashMap<UInt96>>>(get_key_sizes(data_types));

            break;

        case HashKeyType::fixed104:

            method_variant.emplace<MethodKeysFixed<DictHashMap<UInt104>>>(

                    get_key_sizes(data_types));

            break;

        case HashKeyType::fixed128:

            method_variant.emplace<MethodKeysFixed<DictHashMap<UInt128>>>(

                    get_key_sizes(data_types));

            break;

        case HashKeyType::fixed136:

            method_variant.emplace<MethodKeysFixed<DictHashMap<UInt136>>>(

                    get_key_sizes(data_types));

            break;

        case HashKeyType::fixed256:

            method_variant.emplace<MethodKeysFixed<DictHashMap<UInt256>>>(

                    get_key_sizes(data_types));

            break;

        default:

            throw Exception(ErrorCode::INTERNAL_ERROR,

                            "DictionaryHashMapMethod meet invalid key type, type={}", type);

        }

    }

};

} // namespace doris