// 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 "exprs/table_function/udf_table_function.h"

#include <glog/logging.h>

#include "core/assert_cast.h"

#include "core/block/block.h"

#include "core/block/column_numbers.h"

#include "core/column/column_array.h"

#include "core/column/column_nullable.h"

#include "core/data_type/data_type_array.h"

#include "core/data_type/data_type_factory.hpp"

#include "core/types.h"

#include "exec/connector/jni_connector.h"

#include "exprs/vexpr.h"

#include "exprs/vexpr_context.h"

#include "runtime/user_function_cache.h"

namespace doris {

#include "common/compile_check_begin.h"

const char* EXECUTOR_CLASS = "org/apache/doris/udf/UdfExecutor";

const char* EXECUTOR_CTOR_SIGNATURE = "([B)V";

const char* EXECUTOR_EVALUATE_SIGNATURE = "(Ljava/util/Map;Ljava/util/Map;)J";

const char* EXECUTOR_CLOSE_SIGNATURE = "()V";

UDFTableFunction::UDFTableFunction(const TFunction& t_fn) : TableFunction(), _t_fn(t_fn) {

    _fn_name = _t_fn.name.function_name;

    _return_type = DataTypeFactory::instance().create_data_type(t_fn.ret_type);

    // as the java-utdf function in java code is eg: ArrayList<String>

    // so we need a array column to save the execute result, and make_nullable could help deal with nullmap

    _return_type = make_nullable(std::make_shared<DataTypeArray>(make_nullable(_return_type)));

}

Status UDFTableFunction::open() {

    JNIEnv* env = nullptr;

    RETURN_IF_ERROR(Jni::Env::Get(&env));

    _jni_ctx = std::make_shared<JniContext>();

    std::string local_location;

    auto* function_cache = UserFunctionCache::instance();

    TJavaUdfExecutorCtorParams ctor_params;

    ctor_params.__set_fn(_t_fn);

    if (!_t_fn.hdfs_location.empty() && !_t_fn.checksum.empty()) {

        // get jar path if both file path location and checksum are null

        RETURN_IF_ERROR(function_cache->get_jarpath(_t_fn.id, _t_fn.hdfs_location, _t_fn.checksum,

                                                    &local_location));

        ctor_params.__set_location(local_location);

    }

    RETURN_IF_ERROR(Jni::Util::find_class(env, EXECUTOR_CLASS, &_jni_ctx->executor_cl));

    Jni::LocalArray ctor_params_bytes;

    RETURN_IF_ERROR(Jni::Util::SerializeThriftMsg(env, &ctor_params, &ctor_params_bytes));

    RETURN_IF_ERROR(_jni_ctx->executor_cl.get_method(env, "<init>", EXECUTOR_CTOR_SIGNATURE,

                                                     &_jni_ctx->executor_ctor_id));

    RETURN_IF_ERROR(_jni_ctx->executor_cl.get_method(env, "evaluate", EXECUTOR_EVALUATE_SIGNATURE,

                                                     &_jni_ctx->executor_evaluate_id));

    RETURN_IF_ERROR(_jni_ctx->executor_cl.get_method(env, "close", EXECUTOR_CLOSE_SIGNATURE,

                                                     &_jni_ctx->executor_close_id));

    RETURN_IF_ERROR(_jni_ctx->executor_cl.new_object(env, _jni_ctx->executor_ctor_id)

                            .with_arg(ctor_params_bytes)

                            .call(&_jni_ctx->executor));

    _jni_ctx->open_successes = true;

    return Status::OK();

}

Status UDFTableFunction::process_init(Block* block, RuntimeState* state) {

    auto child_size = _expr_context->root()->children().size();

    ColumnNumbers child_column_idxs;

    child_column_idxs.resize(child_size);

    for (int i = 0; i < child_size; ++i) {

        int result_id = -1;

        RETURN_IF_ERROR(_expr_context->root()->children()[i]->execute(_expr_context.get(), block,

                                                                      &result_id));

        DCHECK_NE(result_id, -1);

        child_column_idxs[i] = result_id;

    }

    JNIEnv* env = nullptr;

    RETURN_IF_ERROR(Jni::Env::Get(&env));

    std::unique_ptr<long[]> input_table;

    RETURN_IF_ERROR(

            JniConnector::to_java_table(block, block->rows(), child_column_idxs, input_table));

    auto input_table_schema = JniConnector::parse_table_schema(block, child_column_idxs, true);

    std::map<String, String> input_params = {

            {"meta_address", std::to_string((long)input_table.get())},

            {"required_fields", input_table_schema.first},

            {"columns_types", input_table_schema.second}};

    Jni::LocalObject input_map;

    RETURN_IF_ERROR(Jni::Util::convert_to_java_map(env, input_params, &input_map));

    _array_result_column = _return_type->create_column();

    _result_column_idx = block->columns();

    block->insert({_array_result_column, _return_type, "res"});

    auto output_table_schema = JniConnector::parse_table_schema(block, {_result_column_idx}, true);

    std::string output_nullable = _return_type->is_nullable() ? "true" : "false";

    std::map<String, String> output_params = {{"is_nullable", output_nullable},

                                              {"required_fields", output_table_schema.first},

                                              {"columns_types", output_table_schema.second}};

    Jni::LocalObject output_map;

    RETURN_IF_ERROR(Jni::Util::convert_to_java_map(env, output_params, &output_map));

    long output_address;

    RETURN_IF_ERROR(_jni_ctx->executor.call_long_method(env, _jni_ctx->executor_evaluate_id)

                            .with_arg(input_map)

                            .with_arg(output_map)

                            .call(&output_address));

    RETURN_IF_ERROR(JniConnector::fill_block(block, {_result_column_idx}, output_address));

    block->erase(_result_column_idx);

    if (!extract_column_array_info(*_array_result_column, _array_column_detail)) {

        return Status::NotSupported("column type {} not supported now",

                                    block->get_by_position(_result_column_idx).column->get_name());

    }

    return Status::OK();

}

void UDFTableFunction::process_row(size_t row_idx) {

    TableFunction::process_row(row_idx);

    if (!_array_column_detail.array_nullmap_data ||

        !_array_column_detail.array_nullmap_data[row_idx]) {

        _array_offset = (*_array_column_detail.offsets_ptr)[row_idx - 1];

        _cur_size = (*_array_column_detail.offsets_ptr)[row_idx] - _array_offset;

    }

    // so when it's NULL of row_idx, will not update _cur_size

    // it's will be _cur_size == 0, and means current_empty.

    // if the fn is outer, will be continue insert_default

    // if the fn is not outer function, will be not insert any value.

}

void UDFTableFunction::process_close() {

    _array_result_column = nullptr;

    _array_column_detail.reset();

    _array_offset = 0;

}

void UDFTableFunction::get_same_many_values(MutableColumnPtr& column, int length) {

    size_t pos = _array_offset + _cur_offset;

    if (current_empty() || (_array_column_detail.nested_nullmap_data &&

                            _array_column_detail.nested_nullmap_data[pos])) {

        column->insert_many_defaults(length);

    } else {

        if (_is_nullable) {

            auto* nullable_column = assert_cast<ColumnNullable*>(column.get());

            auto nested_column = nullable_column->get_nested_column_ptr();

            auto nullmap_column = nullable_column->get_null_map_column_ptr();

            nested_column->insert_many_from(*_array_column_detail.nested_col, pos, length);

            assert_cast<ColumnUInt8*>(nullmap_column.get())->insert_many_defaults(length);

        } else {

            column->insert_many_from(*_array_column_detail.nested_col, pos, length);

        }

    }

}

int UDFTableFunction::get_value(MutableColumnPtr& column, int max_step) {

    max_step = std::min(max_step, (int)(_cur_size - _cur_offset));

    size_t pos = _array_offset + _cur_offset;

    if (current_empty()) {

        column->insert_default();

        max_step = 1;

    } else {

        if (_is_nullable) {

            auto* nullable_column = assert_cast<ColumnNullable*>(column.get());

            auto nested_column = nullable_column->get_nested_column_ptr();

            auto* nullmap_column =

                    assert_cast<ColumnUInt8*>(nullable_column->get_null_map_column_ptr().get());

            nested_column->insert_range_from(*_array_column_detail.nested_col, pos, max_step);

            size_t old_size = nullmap_column->size();

            nullmap_column->resize(old_size + max_step);

            memcpy(nullmap_column->get_data().data() + old_size,

                   _array_column_detail.nested_nullmap_data + pos * sizeof(UInt8),

                   max_step * sizeof(UInt8));

        } else {

            column->insert_range_from(*_array_column_detail.nested_col, pos, max_step);

        }

    }

    forward(max_step);

    return max_step;

}

#include "common/compile_check_end.h"

} // namespace doris