// 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 <cstddef>

#include <sstream>

#include <string>

#include "core/arena.h"

#include "core/value/map_value.h"

#include "runtime/collection_value.h"

#include "storage/key_coder.h"

#include "storage/olap_common.h"

#include "storage/olap_define.h"

#include "storage/tablet/tablet_schema.h"

#include "storage/types.h"

#include "storage/utils.h"

#include "util/hash_util.hpp"

#include "util/json/path_in_data.h"

#include "util/slice.h"

namespace doris {

// A Field is used to represent a column in memory format.

// User can use this class to access or deal with column data in memory.

class StorageField {

public:

    StorageField(const TabletColumn& column)

            : _type_info(get_type_info(&column)),

              _desc(column),

              _length(column.length()),

              _key_coder(get_key_coder(column.type())),

              _name(column.name()),

              _index_size(column.index_length()),

              _is_nullable(column.is_nullable()),

              _unique_id(column.unique_id()),

              _parent_unique_id(column.parent_unique_id()),

              _is_extracted_column(column.is_extracted_column()),

              _path(column.path_info_ptr()) {}

    virtual ~StorageField() = default;

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

    size_t length() const { return _length; }

    size_t field_size() const { return size() + 1; }

    size_t index_size() const { return _index_size; }

    int32_t unique_id() const { return _unique_id; }

    int32_t parent_unique_id() const { return _parent_unique_id; }

    bool is_extracted_column() const { return _is_extracted_column; }

    const std::string& name() const { return _name; }

    const PathInDataPtr& path() const { return _path; }

    virtual StorageField* clone() const {

        auto* local = new StorageField(_desc);

        this->clone(local);

        return local;

    }

    FieldType type() const { return _type_info->type(); }

    const TypeInfo* type_info() const { return _type_info.get(); }

    bool is_nullable() const { return _is_nullable; }

    // similar to `full_encode_ascending`, but only encode part (the first `index_size` bytes) of the value.

    // only applicable to string type

    void encode_ascending(const void* value, std::string* buf) const {

        _key_coder->encode_ascending(value, _index_size, buf);

    }

    // encode the provided `value` into `buf`.

    void full_encode_ascending(const void* value, std::string* buf) const {

        _key_coder->full_encode_ascending(value, buf);

    }

    const KeyCoder* key_coder() const { return _key_coder; }

    void add_sub_field(std::unique_ptr<StorageField> sub_field) {

        _sub_fields.emplace_back(std::move(sub_field));

    }

    StorageField* get_sub_field(size_t i) const { return _sub_fields[i].get(); }

    size_t get_sub_field_count() const { return _sub_fields.size(); }

    void set_precision(int32_t precision) { _precision = precision; }

    void set_scale(int32_t scale) { _scale = scale; }

    int32_t get_precision() const { return _precision; }

    int32_t get_scale() const { return _scale; }

    const TabletColumn& get_desc() const { return _desc; }

    int32_t get_unique_id() const {

        return is_extracted_column() ? parent_unique_id() : unique_id();

    }

protected:

    TypeInfoPtr _type_info;

    TabletColumn _desc;

    // unit : byte

    // except for strings, other types have fixed lengths

    // Note that, the struct type itself has fixed length, but due to

    // its number of subfields is a variable, so the actual length of

    // a struct field is not fixed.

    size_t _length;

    void clone(StorageField* other) const {

        other->_type_info = clone_type_info(this->_type_info.get());

        other->_key_coder = this->_key_coder;

        other->_name = this->_name;

        other->_index_size = this->_index_size;

        other->_is_nullable = this->_is_nullable;

        other->_sub_fields.clear();

        other->_precision = this->_precision;

        other->_scale = this->_scale;

        other->_unique_id = this->_unique_id;

        other->_parent_unique_id = this->_parent_unique_id;

        other->_is_extracted_column = this->_is_extracted_column;

        for (const auto& f : _sub_fields) {

            StorageField* item = f->clone();

            other->add_sub_field(std::unique_ptr<StorageField>(item));

        }

    }

private:

    // maximum length of Field, unit : bytes

    // usually equal to length, except for variable-length strings

    const KeyCoder* _key_coder;

    std::string _name;

    size_t _index_size;

    bool _is_nullable;

    std::vector<std::unique_ptr<StorageField>> _sub_fields;

    int32_t _precision;

    int32_t _scale;

    int32_t _unique_id;

    int32_t _parent_unique_id;

    bool _is_extracted_column = false;

    PathInDataPtr _path;

};

class MapField : public StorageField {

public:

    MapField(const TabletColumn& column) : StorageField(column) {}

};

class StructField : public StorageField {

public:

    StructField(const TabletColumn& column) : StorageField(column) {}

};

class ArrayField : public StorageField {

public:

    ArrayField(const TabletColumn& column) : StorageField(column) {}

};

class CharField : public StorageField {

public:

    CharField(const TabletColumn& column) : StorageField(column) {}

    CharField* clone() const override {

        auto* local = new CharField(_desc);

        StorageField::clone(local);

        return local;

    }

};

class VarcharField : public StorageField {

public:

    VarcharField(const TabletColumn& column) : StorageField(column) {}

    VarcharField* clone() const override {

        auto* local = new VarcharField(_desc);

        StorageField::clone(local);

        return local;

    }

};

class StringField : public StorageField {

public:

    StringField(const TabletColumn& column) : StorageField(column) {}

    StringField* clone() const override {

        auto* local = new StringField(_desc);

        StorageField::clone(local);

        return local;

    }

};

class BitmapAggField : public StorageField {

public:

    BitmapAggField(const TabletColumn& column) : StorageField(column) {}

    BitmapAggField* clone() const override {

        auto* local = new BitmapAggField(_desc);

        StorageField::clone(local);

        return local;

    }

};

class QuantileStateAggField : public StorageField {

public:

    QuantileStateAggField(const TabletColumn& column) : StorageField(column) {}

    QuantileStateAggField* clone() const override {

        auto* local = new QuantileStateAggField(_desc);

        StorageField::clone(local);

        return local;

    }

};

class AggStateField : public StorageField {

public:

    AggStateField(const TabletColumn& column) : StorageField(column) {}

    AggStateField* clone() const override {

        auto* local = new AggStateField(_desc);

        StorageField::clone(local);

        return local;

    }

};

class HllAggField : public StorageField {

public:

    HllAggField(const TabletColumn& column) : StorageField(column) {}

    HllAggField* clone() const override {

        auto* local = new HllAggField(_desc);

        StorageField::clone(local);

        return local;

    }

};

class StorageFieldFactory {

public:

    static StorageField* create(const TabletColumn& column) {

        // for key column

        if (column.is_key()) {

            switch (column.type()) {

            case FieldType::OLAP_FIELD_TYPE_CHAR:

                return new CharField(column);

            case FieldType::OLAP_FIELD_TYPE_VARCHAR:

            case FieldType::OLAP_FIELD_TYPE_STRING:

                return new StringField(column);

            case FieldType::OLAP_FIELD_TYPE_STRUCT: {

                auto* local = new StructField(column);

                for (uint32_t i = 0; i < column.get_subtype_count(); i++) {

                    std::unique_ptr<StorageField> sub_field(

                            StorageFieldFactory::create(column.get_sub_column(i)));

                    local->add_sub_field(std::move(sub_field));

                }

                return local;

            }

            case FieldType::OLAP_FIELD_TYPE_ARRAY: {

                std::unique_ptr<StorageField> item_field(

                        StorageFieldFactory::create(column.get_sub_column(0)));

                auto* local = new ArrayField(column);

                local->add_sub_field(std::move(item_field));

                return local;

            }

            case FieldType::OLAP_FIELD_TYPE_MAP: {

                std::unique_ptr<StorageField> key_field(

                        StorageFieldFactory::create(column.get_sub_column(0)));

                std::unique_ptr<StorageField> val_field(

                        StorageFieldFactory::create(column.get_sub_column(1)));

                auto* local = new MapField(column);

                local->add_sub_field(std::move(key_field));

                local->add_sub_field(std::move(val_field));

                return local;

            }

            case FieldType::OLAP_FIELD_TYPE_DECIMAL:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_DECIMAL32:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_DECIMAL64:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_DECIMAL128I:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_DECIMAL256:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_TIMESTAMPTZ:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_DATETIMEV2: {

                StorageField* field = new StorageField(column);

                field->set_precision(column.precision());

                field->set_scale(column.frac());

                return field;

            }

            default:

                return new StorageField(column);

            }

        }

        // for value column

        switch (column.aggregation()) {

        case FieldAggregationMethod::OLAP_FIELD_AGGREGATION_NONE:

        case FieldAggregationMethod::OLAP_FIELD_AGGREGATION_SUM:

        case FieldAggregationMethod::OLAP_FIELD_AGGREGATION_MIN:

        case FieldAggregationMethod::OLAP_FIELD_AGGREGATION_MAX:

        case FieldAggregationMethod::OLAP_FIELD_AGGREGATION_REPLACE:

        case FieldAggregationMethod::OLAP_FIELD_AGGREGATION_REPLACE_IF_NOT_NULL:

            switch (column.type()) {

            case FieldType::OLAP_FIELD_TYPE_CHAR:

                return new CharField(column);

            case FieldType::OLAP_FIELD_TYPE_VARCHAR:

                return new VarcharField(column);

            case FieldType::OLAP_FIELD_TYPE_STRING:

                return new StringField(column);

            case FieldType::OLAP_FIELD_TYPE_STRUCT: {

                auto* local = new StructField(column);

                for (uint32_t i = 0; i < column.get_subtype_count(); i++) {

                    std::unique_ptr<StorageField> sub_field(

                            StorageFieldFactory::create(column.get_sub_column(i)));

                    local->add_sub_field(std::move(sub_field));

                }

                return local;

            }

            case FieldType::OLAP_FIELD_TYPE_ARRAY: {

                std::unique_ptr<StorageField> item_field(

                        StorageFieldFactory::create(column.get_sub_column(0)));

                auto* local = new ArrayField(column);

                local->add_sub_field(std::move(item_field));

                return local;

            }

            case FieldType::OLAP_FIELD_TYPE_MAP: {

                DCHECK(column.get_subtype_count() == 2);

                auto* local = new MapField(column);

                std::unique_ptr<StorageField> key_field(

                        StorageFieldFactory::create(column.get_sub_column(0)));

                std::unique_ptr<StorageField> value_field(

                        StorageFieldFactory::create(column.get_sub_column(1)));

                local->add_sub_field(std::move(key_field));

                local->add_sub_field(std::move(value_field));

                return local;

            }

            case FieldType::OLAP_FIELD_TYPE_DECIMAL:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_DECIMAL32:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_DECIMAL64:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_DECIMAL128I:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_DECIMAL256:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_TIMESTAMPTZ:

                [[fallthrough]];

            case FieldType::OLAP_FIELD_TYPE_DATETIMEV2: {

                StorageField* field = new StorageField(column);

                field->set_precision(column.precision());

                field->set_scale(column.frac());

                return field;

            }

            default:

                return new StorageField(column);

            }

        case FieldAggregationMethod::OLAP_FIELD_AGGREGATION_HLL_UNION:

            return new HllAggField(column);

        case FieldAggregationMethod::OLAP_FIELD_AGGREGATION_BITMAP_UNION:

            return new BitmapAggField(column);

        case FieldAggregationMethod::OLAP_FIELD_AGGREGATION_QUANTILE_UNION:

            return new QuantileStateAggField(column);

        case FieldAggregationMethod::OLAP_FIELD_AGGREGATION_GENERIC:

            return new AggStateField(column);

        case FieldAggregationMethod::OLAP_FIELD_AGGREGATION_UNKNOWN:

            CHECK(false) << ", value column no agg type";

            return nullptr;

        }

        return nullptr;

    }

    static StorageField* create_by_type(const FieldType& type) {

        TabletColumn column(FieldAggregationMethod::OLAP_FIELD_AGGREGATION_NONE, type);

        return create(column);

    }

};

} // namespace doris