// 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.

#include "udf/python/python_udf_meta.h"

#include <arrow/util/base64.h>

#include <fmt/core.h>

#include <rapidjson/stringbuffer.h>

#include <rapidjson/writer.h>

#include <sstream>

#include "common/status.h"

#include "format/arrow/arrow_utils.h"

#include "util/string_util.h"

namespace doris {

Status PythonUDFMeta::convert_types_to_schema(const DataTypes& types, const std::string& timezone,

                                              std::shared_ptr<arrow::Schema>* schema) {

    assert(!types.empty());

    arrow::SchemaBuilder builder;

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

        std::shared_ptr<arrow::DataType> arrow_type;

        RETURN_IF_ERROR(convert_to_arrow_type(types[i], &arrow_type, timezone));

        std::shared_ptr<arrow::Field> field = std::make_shared<arrow::Field>(

                "arg" + std::to_string(i), arrow_type, types[i]->is_nullable());

        RETURN_DORIS_STATUS_IF_ERROR(builder.AddField(field));

    }

    RETURN_DORIS_STATUS_IF_RESULT_ERROR(schema, builder.Finish());

    return Status::OK();

}

Status PythonUDFMeta::serialize_arrow_schema(const std::shared_ptr<arrow::Schema>& schema,

                                             std::shared_ptr<arrow::Buffer>* out) {

    RETURN_DORIS_STATUS_IF_RESULT_ERROR(

            out, arrow::ipc::SerializeSchema(*schema, arrow::default_memory_pool()));

    return Status::OK();

}

/*

    json format:

    {

        "name": "xxx",

        "symbol": "xxx",

        "location": "xxx",

        "udf_load_type": 0 or 1,

        "client_type": 0 (UDF) or 1 (UDAF) or 2 (UDTF),

        "runtime_version": "x.xx.xx",

        "always_nullable": true,

        "inline_code": "base64_inline_code",

        "input_types": "base64_input_types",

        "return_type": "base64_return_type"

    }

*/

Status PythonUDFMeta::serialize_to_json(std::string* json_str) const {

    rapidjson::Document doc;

    doc.SetObject();

    auto& allocator = doc.GetAllocator();

    doc.AddMember("name", rapidjson::Value().SetString(name.c_str(), allocator), allocator);

    doc.AddMember("symbol", rapidjson::Value().SetString(symbol.c_str(), allocator), allocator);

    doc.AddMember("location", rapidjson::Value().SetString(location.c_str(), allocator), allocator);

    doc.AddMember("udf_load_type", rapidjson::Value().SetInt(static_cast<int>(type)), allocator);

    doc.AddMember("client_type", rapidjson::Value().SetInt(static_cast<int>(client_type)),

                  allocator);

    doc.AddMember("runtime_version",

                  rapidjson::Value().SetString(runtime_version.c_str(), allocator), allocator);

    doc.AddMember("always_nullable", rapidjson::Value().SetBool(always_nullable), allocator);

    {

        // Serialize base64 inline code to json

        std::string base64_str = arrow::util::base64_encode(inline_code);

        doc.AddMember("inline_code", rapidjson::Value().SetString(base64_str.c_str(), allocator),

                      allocator);

    }

    {

        // Serialize base64 input types to json

        std::shared_ptr<arrow::Schema> input_schema;

        RETURN_IF_ERROR(convert_types_to_schema(input_types, TimezoneUtils::default_time_zone,

                                                &input_schema));

        std::shared_ptr<arrow::Buffer> input_schema_buffer;

        RETURN_IF_ERROR(serialize_arrow_schema(input_schema, &input_schema_buffer));

        std::string base64_str =

                arrow::util::base64_encode({input_schema_buffer->data_as<char>(),

                                            static_cast<size_t>(input_schema_buffer->size())});

        doc.AddMember("input_types", rapidjson::Value().SetString(base64_str.c_str(), allocator),

                      allocator);

    }

    {

        // Serialize base64 return type to json

        std::shared_ptr<arrow::Schema> return_schema;

        RETURN_IF_ERROR(convert_types_to_schema({return_type}, TimezoneUtils::default_time_zone,

                                                &return_schema));

        std::shared_ptr<arrow::Buffer> return_schema_buffer;

        RETURN_IF_ERROR(serialize_arrow_schema(return_schema, &return_schema_buffer));

        std::string base64_str =

                arrow::util::base64_encode({return_schema_buffer->data_as<char>(),

                                            static_cast<size_t>(return_schema_buffer->size())});

        doc.AddMember("return_type", rapidjson::Value().SetString(base64_str.c_str(), allocator),

                      allocator);

    }

    // Convert document to json string

    rapidjson::StringBuffer buffer;

    rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);

    doc.Accept(writer);

    *json_str = std::string(buffer.GetString(), buffer.GetSize());

    return Status::OK();

}

std::string PythonUDFMeta::to_string() const {

    std::stringstream input_types_ss;

    input_types_ss << "<";

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

        input_types_ss << input_types[i]->get_name();

        if (i != input_types.size() - 1) {

            input_types_ss << ", ";

        }

    }

    input_types_ss << ">";

    return fmt::format(

            "[name: {}, symbol: {}, location: {}, runtime_version: {}, always_nullable: {}, "

            "inline_code: {}][input_types: {}][return_type: {}]",

            name, symbol, location, runtime_version, always_nullable, inline_code,

            input_types_ss.str(), return_type->get_name());

}

Status PythonUDFMeta::check() const {

    if (trim(name).empty()) {

        return Status::InvalidArgument("Python UDF name is empty");

    }

    if (trim(symbol).empty()) {

        return Status::InvalidArgument("Python UDF symbol is empty");

    }

    if (trim(runtime_version).empty()) {

        return Status::InvalidArgument("Python UDF runtime version is empty");

    }

    if (input_types.empty()) {

        return Status::InvalidArgument("Python UDF input types is empty");

    }

    if (!return_type) {

        return Status::InvalidArgument("Python UDF return type is empty");

    }

    if (type == PythonUDFLoadType::UNKNOWN) {

        return Status::InvalidArgument(

                "Python UDF load type is invalid, please check inline code or file path");

    }

    if (type == PythonUDFLoadType::MODULE) {

        if (trim(location).empty()) {

            return Status::InvalidArgument("Non-inline Python UDF location is empty");

        }

        if (trim(checksum).empty()) {

            return Status::InvalidArgument("Non-inline Python UDF checksum is empty");

        }

    }

    return Status::OK();

}

} // namespace doris