// 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 <stdint.h>

#include <stdlib.h>

#include <memory>

#include <string>

#include "common/status.h"

#include "olap/field.h"

#include "olap/row_cursor_cell.h"

#include "olap/tablet_schema.h"

#include "util/slice.h"

namespace doris {

enum class FieldType;

class WrapperField {

public:

    static Result<WrapperField*> create(const TabletColumn& column, uint32_t len = 0);

    static WrapperField* create_by_type(const FieldType& type) { return create_by_type(type, 0); }

    static WrapperField* create_by_type(const FieldType& type, int32_t var_length);

    WrapperField(Field* rep, size_t variable_len, bool is_string_type);

    virtual ~WrapperField() {

        delete _rep;

        delete[] _owned_buf;

        if (_long_text_buf) {

            free(_long_text_buf);

        }

    }

    // Convert the internal value to string output.

    //

    // NOTE: it only for DEBUG use. Do not include the null flag.

    std::string to_string() const { return _rep->to_string(_field_buf + 1); }

    // Deserialize field value from incoming string.

    //

    // NOTE: the parameter must be a '\0' terminated string. It do not include the null flag.

    Status from_string(const std::string& value_string, const int precision = 0,

                       const int scale = 0) {

        if (_is_string_type) {

            if (value_string.size() > _var_length) {

                Slice* slice = reinterpret_cast<Slice*>(cell_ptr());

                slice->size = value_string.size();

                _var_length = slice->size;

                _string_content.reset(new char[slice->size]);

                slice->data = _string_content.get();

            }

        }

        return _rep->from_string(_field_buf + 1, value_string, precision, scale);

    }

    bool is_string_type() const { return _is_string_type; }

    char* ptr() const { return _field_buf + 1; }

    size_t size() const { return _rep->size(); }

    size_t field_size() const { return _rep->field_size(); }

    bool is_null() const { return *reinterpret_cast<bool*>(_field_buf); }

    void set_is_null(bool is_null) { *reinterpret_cast<bool*>(_field_buf) = is_null; }

    void set_null() { *reinterpret_cast<bool*>(_field_buf) = true; }

    void set_not_null() { *reinterpret_cast<bool*>(_field_buf) = false; }

    char* nullable_cell_ptr() const { return _field_buf; }

    void set_to_max() { _rep->set_to_max(_field_buf + 1); }

    void set_to_min() { _rep->set_to_min(_field_buf + 1); }

    void* cell_ptr() const { return _field_buf + 1; }

    void* mutable_cell_ptr() const { return _field_buf + 1; }

    const Field* field() const { return _rep; }

    int cmp(const WrapperField* field) const { return _rep->compare_cell(*this, *field); }

    void copy(const WrapperField* field) { _rep->direct_copy(this, *field); }

private:

    Field* _rep = nullptr;

    bool _is_string_type;

    char* _field_buf = nullptr;

    char* _owned_buf = nullptr;

    char* _long_text_buf = nullptr;

    // Include fixed and variable length and null bytes.

    size_t _length;

    size_t _var_length;

    // Memory for string type field.

    std::unique_ptr<char[]> _string_content;

};

} // namespace doris