// 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 "olap/key_coder.h"

#include "olap/olap_common.h"

#include "olap/olap_define.h"

#include "olap/row_cursor_cell.h"

#include "olap/tablet_schema.h"

#include "olap/types.h"

#include "olap/utils.h"

#include "runtime/collection_value.h"

#include "runtime/map_value.h"

#include "util/hash_util.hpp"

#include "util/slice.h"

#include "vec/common/arena.h"

#include "vec/json/path_in_data.h"

namespace doris {

#include "common/compile_check_begin.h"

// 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 Field {

public:

    Field(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 ~Field() = 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 vectorized::PathInDataPtr& path() const { return _path; }

    virtual void set_to_max(char* buf) const { return _type_info->set_to_max(buf); }

    virtual void set_to_min(char* buf) const { return _type_info->set_to_min(buf); }

    void set_long_text_buf(char** buf) { _long_text_buf = buf; }

    virtual size_t get_variable_len() const { return 0; }

    virtual Field* clone() const {

        auto* local = new Field(_desc);

        this->clone(local);

        return local;

    }

    // Only compare column content, without considering nullptr condition.

    // RETURNS:

    //      0 means equal,

    //      -1 means left less than right,

    //      1 means left bigger than right

    int compare(const void* left, const void* right) const { return _type_info->cmp(left, right); }

    // Compare two types of cell.

    // This function differs compare in that this function compare cell which

    // will consider the condition which cell may be nullptr. While compare only

    // compare column content without considering nullptr condition.

    // Only compare column content, without considering nullptr condition.

    // RETURNS:

    //      0 means equal,

    //      -1 means left less than right,

    //      1 means left bigger than right

    template <typename LhsCellType, typename RhsCellType>

    int compare_cell(const LhsCellType& lhs, const RhsCellType& rhs) const {

        bool l_null = lhs.is_null();

        bool r_null = rhs.is_null();

        if (l_null != r_null) {

            return l_null ? -1 : 1;

        }

        return l_null ? 0 : _type_info->cmp(lhs.cell_ptr(), rhs.cell_ptr());

    }

    // deep copy source cell' content to destination cell.

    // For string type, this will allocate data form arena,

    // and copy source's content.

    template <typename DstCellType, typename SrcCellType>

    void deep_copy(DstCellType* dst, const SrcCellType& src, vectorized::Arena& arena) const {

        bool is_null = src.is_null();

        dst->set_is_null(is_null);

        if (is_null) {

            return;

        }

        _type_info->deep_copy(dst->mutable_cell_ptr(), src.cell_ptr(), arena);

    }

    // used by init scan key stored in string format

    // value_string should end with '\0'

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

                       const int scale = 0) const {

        if (type() == FieldType::OLAP_FIELD_TYPE_STRING && !value_string.empty()) {

            auto slice = reinterpret_cast<Slice*>(buf);

            if (slice->size < value_string.size()) {

                *_long_text_buf = static_cast<char*>(realloc(*_long_text_buf, value_string.size()));

                slice->data = *_long_text_buf;

                slice->size = value_string.size();

            }

        }

        return _type_info->from_string(buf, value_string, precision, scale);

    }

    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);

    }

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

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

    }

    Field* 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;

    // Since the length of the STRING type cannot be determined,

    // only dynamic memory can be used. Arena cannot realize realloc.

    // The schema information is shared globally. Therefore,

    // dynamic memory can only be managed in thread local mode.

    // The memory will be created and released in rowcursor.

    char** _long_text_buf = nullptr;

    char* allocate_string_value(vectorized::Arena& arena) const {

        char* type_value = arena.alloc(sizeof(Slice));

        auto slice = reinterpret_cast<Slice*>(type_value);

        slice->size = _length;

        slice->data = arena.alloc(slice->size);

        return type_value;

    }

    void clone(Field* 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) {

            Field* item = f->clone();

            other->add_sub_field(std::unique_ptr<Field>(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<Field>> _sub_fields;

    int32_t _precision;

    int32_t _scale;

    int32_t _unique_id;

    int32_t _parent_unique_id;

    bool _is_extracted_column = false;

    vectorized::PathInDataPtr _path;

};

class MapField : public Field {

public:

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

    size_t get_variable_len() const override { return _length; }

};

class StructField : public Field {

public:

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

    size_t get_variable_len() const override {

        size_t variable_len = _length;

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

            variable_len += get_sub_field(i)->get_variable_len();

        }

        return variable_len;

    }

};

class ArrayField : public Field {

public:

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

    size_t get_variable_len() const override { return _length; }

};

class CharField : public Field {

public:

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

    size_t get_variable_len() const override { return _length; }

    CharField* clone() const override {

        auto* local = new CharField(_desc);

        Field::clone(local);

        return local;

    }

    void set_to_max(char* ch) const override {

        auto slice = reinterpret_cast<Slice*>(ch);

        slice->size = _length;

        memset(slice->data, 0xFF, slice->size);

    }

};

class VarcharField : public Field {

public:

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

    size_t get_variable_len() const override { return _length - OLAP_VARCHAR_MAX_BYTES; }

    VarcharField* clone() const override {

        auto* local = new VarcharField(_desc);

        Field::clone(local);

        return local;

    }

    void set_to_max(char* ch) const override {

        auto slice = reinterpret_cast<Slice*>(ch);

        slice->size = _length - OLAP_VARCHAR_MAX_BYTES;

        memset(slice->data, 0xFF, slice->size);

    }

};

class StringField : public Field {

public:

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

    StringField* clone() const override {

        auto* local = new StringField(_desc);

        Field::clone(local);

        return local;

    }

    void set_to_max(char* ch) const override {

        auto slice = reinterpret_cast<Slice*>(ch);

        memset(slice->data, 0xFF, slice->size);

    }

};

class BitmapAggField : public Field {

public:

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

    BitmapAggField* clone() const override {

        auto* local = new BitmapAggField(_desc);

        Field::clone(local);

        return local;

    }

};

class QuantileStateAggField : public Field {

public:

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

    QuantileStateAggField* clone() const override {

        auto* local = new QuantileStateAggField(_desc);

        Field::clone(local);

        return local;

    }

};

class AggStateField : public Field {

public:

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

    AggStateField* clone() const override {

        auto* local = new AggStateField(_desc);

        Field::clone(local);

        return local;

    }

};

class HllAggField : public Field {

public:

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

    HllAggField* clone() const override {

        auto* local = new HllAggField(_desc);

        Field::clone(local);

        return local;

    }

};

class FieldFactory {

public:

    static Field* 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<Field> sub_field(

                            FieldFactory::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<Field> item_field(FieldFactory::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<Field> key_field(FieldFactory::create(column.get_sub_column(0)));

                std::unique_ptr<Field> val_field(FieldFactory::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: {

                Field* field = new Field(column);

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

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

                return field;

            }

            default:

                return new Field(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<Field> sub_field(

                            FieldFactory::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<Field> item_field(FieldFactory::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<Field> key_field(FieldFactory::create(column.get_sub_column(0)));

                std::unique_ptr<Field> value_field(FieldFactory::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: {

                Field* field = new Field(column);

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

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

                return field;

            }

            default:

                return new Field(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 Field* create_by_type(const FieldType& type) {

        TabletColumn column(FieldAggregationMethod::OLAP_FIELD_AGGREGATION_NONE, type);

        return create(column);

    }

};

#include "common/compile_check_end.h"

} // namespace doris