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// 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.

#include "core/column/column_map.h"

#include "core/column/column_nullable.h"

#include "core/data_type/data_type_map.h"

#include "exprs/function/cast/cast_base.h"

namespace doris::CastWrapper {

#include "common/compile_check_begin.h"

//TODO(Amory) . Need support more cast for key , value for map

WrapperType create_map_wrapper(FunctionContext* context, const DataTypePtr& from_type,

                               const DataTypeMap& to_type) {

    if (is_string_type(from_type->get_primitive_type())) {

        if (context->enable_strict_mode()) {

            return cast_from_string_to_complex_type_strict_mode;

        } else {

            return cast_from_string_to_complex_type;

        }

    }

    const auto* from = check_and_get_data_type<DataTypeMap>(from_type.get());

    if (!from) {

        return CastWrapper::create_unsupport_wrapper(

                fmt::format("CAST AS Map can only be performed between Map types or from "

                            "String. from type: {}, to type: {}",

                            from_type->get_name(), to_type.get_name()));

    }

    DataTypes from_kv_types;

    DataTypes to_kv_types;

    from_kv_types.reserve(2);

    to_kv_types.reserve(2);

    from_kv_types.push_back(from->get_key_type());

    from_kv_types.push_back(from->get_value_type());

    to_kv_types.push_back(to_type.get_key_type());

    to_kv_types.push_back(to_type.get_value_type());

    auto kv_wrappers = get_element_wrappers(context, from_kv_types, to_kv_types);

    return [kv_wrappers, from_kv_types, to_kv_types](

                   FunctionContext* context, Block& block, const ColumnNumbers& arguments,

                   uint32_t result, size_t /*input_rows_count*/,

                   const NullMap::value_type* null_map = nullptr) -> Status {

        auto& from_column = block.get_by_position(arguments.front()).column;

        const auto* from_col_map = check_and_get_column<ColumnMap>(from_column.get());

        if (!from_col_map) {

            return Status::RuntimeError("Illegal column {} for function CAST AS MAP",

                                        from_column->get_name());

        }

        Columns converted_columns(2);

        ColumnsWithTypeAndName columnsWithTypeAndName(2);

        columnsWithTypeAndName[0] = {from_col_map->get_keys_ptr(), from_kv_types[0], ""};

        columnsWithTypeAndName[1] = {from_col_map->get_values_ptr(), from_kv_types[1], ""};

        for (size_t i = 0; i < 2; ++i) {

            ColumnNumbers element_arguments {block.columns()};

            block.insert(columnsWithTypeAndName[i]);

            auto element_result = block.columns();

            block.insert({to_kv_types[i], ""});

            RETURN_IF_ERROR(kv_wrappers[i](context, block, element_arguments, element_result,

                                           columnsWithTypeAndName[i].column->size(), null_map));

            converted_columns[i] = block.get_by_position(element_result).column;

        }

        auto map_column = ColumnMap::create(converted_columns[0], converted_columns[1],

                                            from_col_map->get_offsets_ptr());

        static_cast<void>(assert_cast<ColumnMap&>(*map_column).deduplicate_keys());

        block.get_by_position(result).column = std::move(map_column);

        return Status::OK();

    };

}

#include "common/compile_check_end.h"

} // namespace doris::CastWrapper