// Licensed to the Apache Software Foundation (ASF) under one

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// 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/assert_cast.h"

#include "core/data_type/data_type_jsonb.h"

#include "core/data_type/data_type_nullable.h"

#include "core/data_type/primitive_type.h"

#include "core/data_type_serde/data_type_serde.h"

#include "core/string_ref.h"

#include "core/value/jsonb_value.h"

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

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

#include "util/jsonb_utils.h"

#include "util/jsonb_writer.h"

namespace doris::CastWrapper {

struct ConvertImplGenericFromJsonb {

    static Status execute(FunctionContext* context, Block& block, const ColumnNumbers& arguments,

                          uint32_t result, size_t input_rows_count,

                          const NullMap::value_type* null_map = nullptr) {

        auto data_type_to = block.get_by_position(result).type;

        auto data_type_serde_to = data_type_to->get_serde();

        DataTypeSerDe::FormatOptions options;

        options.converted_from_string = true;

        options.escape_char = '\\';

        options.timezone = &context->state()->timezone_obj();

        const auto& col_with_type_and_name = block.get_by_position(arguments[0]);

        const IColumn& col_from = *col_with_type_and_name.column;

        if (const ColumnString* col_from_string = check_and_get_column<ColumnString>(&col_from)) {

            auto col_to = data_type_to->create_column();

            size_t size = col_from.size();

            col_to->reserve(size);

            ColumnUInt8::MutablePtr col_null_map_to = ColumnUInt8::create(size, 0);

            ColumnUInt8::Container* vec_null_map_to = &col_null_map_to->get_data();

            const bool is_complex = is_complex_type(data_type_to->get_primitive_type());

            const bool is_dst_string = is_string_type(data_type_to->get_primitive_type());

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

                if (null_map && null_map[i]) {

                    (*vec_null_map_to)[i] = 1;

                    col_to->insert_default();

                    continue;

                }

                const auto& val = col_from_string->get_data_at(i);

                const JsonbDocument* doc = nullptr;

                auto st = JsonbDocument::checkAndCreateDocument(val.data, val.size, &doc);

                if (!st.ok() || !doc || !doc->getValue()) [[unlikely]] {

                    (*vec_null_map_to)[i] = 1;

                    col_to->insert_default();

                    continue;

                }

                // value is NOT necessary to be deleted since JsonbValue will not allocate memory

                const JsonbValue* value = doc->getValue();

                if (UNLIKELY(!value)) {

                    (*vec_null_map_to)[i] = 1;

                    col_to->insert_default();

                    continue;

                }

                // Note: here we should handle the null element

                if (val.size == 0) {

                    col_to->insert_default();

                    // empty string('') is an invalid format for complex type, set null_map to 1

                    if (is_complex) {

                        (*vec_null_map_to)[i] = 1;

                    }

                    continue;

                }

                // add string to string column

                if (context->jsonb_string_as_string() && is_dst_string && value->isString()) {

                    const auto* blob = value->unpack<JsonbBinaryVal>();

                    assert_cast<ColumnString&, TypeCheckOnRelease::DISABLE>(*col_to).insert_data(

                            blob->getBlob(), blob->getBlobLen());

                    (*vec_null_map_to)[i] = 0;

                    continue;

                }

                std::string input_str;

                if (context->jsonb_string_as_string() && value->isString()) {

                    const auto* blob = value->unpack<JsonbBinaryVal>();

                    input_str = std::string(blob->getBlob(), blob->getBlobLen());

                } else {

                    input_str = JsonbToJson::jsonb_to_json_string(val.data, val.size);

                }

                if (input_str.empty()) {

                    col_to->insert_default();

                    (*vec_null_map_to)[i] = 1;

                    continue;

                }

                StringRef read_buffer((char*)(input_str.data()), input_str.size());

                st = data_type_serde_to->from_string(read_buffer, *col_to, options);

                // if parsing failed, will return null

                (*vec_null_map_to)[i] = !st.ok();

                if (!st.ok()) {

                    col_to->insert_default();

                }

            }

            block.get_by_position(result).column =

                    ColumnNullable::create(std::move(col_to), std::move(col_null_map_to));

        } else {

            return Status::RuntimeError(

                    "Illegal column {} of first argument of conversion function from string",

                    col_from.get_name());

        }

        return Status::OK();

    }

};

inline bool can_cast_json_type(PrimitiveType pt) {

    return is_int_or_bool(pt) || is_float_or_double(pt) || is_string_type(pt) || is_decimal(pt) ||

           pt == TYPE_ARRAY || pt == TYPE_STRUCT;

}

// check jsonb value type and get to_type value

WrapperType create_cast_from_jsonb_wrapper(const DataTypeJsonb& from_type,

                                           const DataTypePtr& to_type,

                                           bool jsonb_string_as_string) {

    if (is_string_type(to_type->get_primitive_type()) && jsonb_string_as_string) {

        return ConvertImplGenericFromJsonb::execute;

    }

    return [](FunctionContext* context, Block& block, const ColumnNumbers& arguments,

              uint32_t result, size_t input_rows_count, const NullMap::value_type* null_map) {

        CastParameters params;

        params.is_strict = context->enable_strict_mode();

        auto data_type_to = remove_nullable(block.get_by_position(result).type);

        auto serde_to = data_type_to->get_serde();

        const auto& col_from_json =

                assert_cast<const ColumnString&>(*block.get_by_position(arguments[0]).column);

        auto column_to = make_nullable(data_type_to)->create_column();

        auto& column_to_nullable = assert_cast<ColumnNullable&>(*column_to);

        RETURN_IF_ERROR(serde_to->deserialize_column_from_jsonb_vector(

                column_to_nullable, col_from_json, params, null_map));

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

        return Status::OK();

    };

}

struct ParseJsonbFromString {

    static Status parse_json(const StringRef& str, ColumnString& column_string) {

        if (str.empty()) {

            return Status::InvalidArgument("Empty string cannot be parsed as jsonb");

        }

        JsonBinaryValue value;

        auto st = (value.from_json_string(str.data, str.size));

        if (!st.ok()) {

            return Status::InvalidArgument("Failed to parse json string: {}, error: {}",

                                           str.to_string(), st.msg());

        }

        column_string.insert_data(value.value(), value.size());

        return Status::OK();

    }

    static Status execute_non_strict(const ColumnString& col_from, size_t size,

                                     ColumnPtr& column_result) {

        auto col_to = ColumnString::create();

        auto col_null = ColumnBool::create(size, 0);

        auto& vec_null_map_to = col_null->get_data();

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

            Status st = parse_json(col_from.get_data_at(i), *col_to);

            vec_null_map_to[i] = !st.ok();

            if (!st.ok()) [[unlikely]] {

                col_to->insert_default();

            }

        }

        column_result = ColumnNullable::create(std::move(col_to), std::move(col_null));

        return Status::OK();

    }

    // in both strict or non-strict mode, the return type is nullable column

    static Status execute_strict(const ColumnString& col_from, const NullMap::value_type* null_map,

                                 size_t size, ColumnPtr& column_result) {

        auto col_to = ColumnString::create();

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

            if (null_map && null_map[i]) {

                col_to->insert_default();

                continue;

            }

            RETURN_IF_ERROR(parse_json(col_from.get_data_at(i), *col_to));

        }

        column_result = ColumnNullable::create(std::move(col_to), ColumnBool::create(size, 0));

        return Status::OK();

    }

    static Status execute(FunctionContext* context, Block& block, const ColumnNumbers& arguments,

                          uint32_t result, size_t input_rows_count,

                          const NullMap::value_type* null_map) {

        const auto& col_from =

                assert_cast<const ColumnString&>(*block.get_by_position(arguments[0]).column);

        const auto size = col_from.size();

        ColumnPtr column_result;

        if (context->enable_strict_mode()) {

            RETURN_IF_ERROR(execute_strict(col_from, null_map, size, column_result));

        } else {

            RETURN_IF_ERROR(execute_non_strict(col_from, size, column_result));

        }

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

        return Status::OK();

    }

};

// create corresponding jsonb value with type to_type

// use jsonb writer to create jsonb value

WrapperType create_cast_to_jsonb_wrapper(const DataTypePtr& from_type, const DataTypeJsonb& to_type,

                                         bool string_as_jsonb_string) {

    // parse string as jsonb

    if (is_string_type(from_type->get_primitive_type()) && !string_as_jsonb_string) {

        return ParseJsonbFromString::execute;

    }

    return [](FunctionContext* context, Block& block, const ColumnNumbers& arguments,

              uint32_t result, size_t input_rows_count, const NullMap::value_type* null_map) {

        // same as to_json function

        auto to_column = ColumnString::create();

        auto from_type_serde = block.get_by_position(arguments[0]).type->get_serde();

        auto from_column = block.get_by_position(arguments[0]).column;

        RETURN_IF_ERROR(from_type_serde->serialize_column_to_jsonb_vector(*from_column, *to_column,

                                                                          null_map));

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

        return Status::OK();

    };

}

} // namespace doris::CastWrapper