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// 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 "format_v2/table/hudi_reader.h"

#include <utility>

#include "exprs/vexpr_context.h"

#include "format_v2/column_mapper.h"

#include "format_v2/jni/hudi_jni_reader.h"

#include "format_v2/table/schema_history_util.h"

#include "gen_cpp/PlanNodes_types.h"

namespace doris::format::hudi {

Status HudiReader::prepare_split(const format::SplitReadOptions& options) {

    {

        // Derived schema selection is additive to, not nested around, the common base timers.

        SCOPED_TIMER(_profile.total_timer);

        SCOPED_TIMER(_profile.prepare_split_timer);

        _split_schema_id = -1;

        if (options.current_range.__isset.table_format_params &&

            options.current_range.table_format_params.__isset.hudi_params &&

            options.current_range.table_format_params.hudi_params.__isset.schema_id) {

            _split_schema_id = options.current_range.table_format_params.hudi_params.schema_id;

        }

    }

    RETURN_IF_ERROR(format::TableReader::prepare_split(options));

    SCOPED_TIMER(_profile.total_timer);

    SCOPED_TIMER(_profile.prepare_split_timer);

    if (current_split_pruned()) {

        return Status::OK();

    }

    // This native reader only receives Hudi base-file splits that do not require merging delta

    // logs. Hudi creates a new versioned base file for updates and compaction instead of modifying

    // an existing Parquet/ORC base file in place, so missing mtime does not make its page-cache key

    // ambiguous. Merge-on-read log files remain on the JNI path because they may be appended and

    // must never be marked immutable here.

    mark_current_data_file_immutable();

    return Status::OK();

}

format::TableColumnMappingMode HudiReader::mapping_mode() const {

    return format::can_map_by_history_schema(_scan_params, _split_schema_id)

                   ? format::TableColumnMappingMode::BY_FIELD_ID

                   : format::TableColumnMappingMode::BY_NAME;

}

Status HudiReader::annotate_file_schema(std::vector<format::ColumnDefinition>* file_schema) {

    DORIS_CHECK(file_schema != nullptr);

    if (mapping_mode() != format::TableColumnMappingMode::BY_FIELD_ID) {

        return Status::OK();

    }

    return format::annotate_file_schema_from_history(_scan_params, _split_schema_id, file_schema);

}

Status HudiHybridReader::init(format::TableReadOptions&& options) {

    return format::TableReader::init(std::move(options));

}

Status HudiHybridReader::prepare_split(const format::SplitReadOptions& options) {

    // A newly selected child initializes against the same scanner profile. Keep hybrid dispatch

    // outside those shared counters so first-split initialization is counted exactly once.

    RETURN_IF_ERROR(_ensure_current_split_reader(options));

    DORIS_CHECK(_current_split_reader != nullptr);

    return _current_split_reader->prepare_split(options);

}

Status HudiHybridReader::get_block(Block* block, bool* eos) {

    DORIS_CHECK(_current_split_reader != nullptr);

    return _current_split_reader->get_block(block, eos);

}

bool HudiHybridReader::current_split_pruned() const {

    DORIS_CHECK(_current_split_reader != nullptr);

    return _current_split_reader->current_split_pruned();

}

bool HudiHybridReader::current_split_uses_metadata_count() const {

    DORIS_CHECK(_current_split_reader != nullptr);

    return _current_split_reader->current_split_uses_metadata_count();

}

Status HudiHybridReader::abort_split() {

    DORIS_CHECK(_current_split_reader != nullptr);

    return _current_split_reader->abort_split();

}

Status HudiHybridReader::close() {

    Status close_status = Status::OK();

    if (_native_reader != nullptr) {

        close_status = _native_reader->close();

    }

    if (_jni_reader != nullptr) {

        auto status = _jni_reader->close();

        if (!status.ok() && close_status.ok()) {

            close_status = std::move(status);

        }

    }

    _current_split_reader = nullptr;

    return close_status;

}

void HudiHybridReader::set_batch_size(size_t batch_size) {

    format::TableReader::set_batch_size(batch_size);

    if (_native_reader != nullptr) {

        _native_reader->set_batch_size(_batch_size);

    }

    if (_jni_reader != nullptr) {

        _jni_reader->set_batch_size(_batch_size);

    }

}

int64_t HudiHybridReader::condition_cache_hit_count() const {

    // Keep the wrapper count cumulative across native/JNI dispatch so scanner-level delta

    // accounting neither loses a child hit nor observes a counter reset on a split switch.

    return (_native_reader == nullptr ? 0 : _native_reader->condition_cache_hit_count()) +

           (_jni_reader == nullptr ? 0 : _jni_reader->condition_cache_hit_count());

}

Status HudiHybridReader::_ensure_current_split_reader(const format::SplitReadOptions& options) {

    DORIS_CHECK(_scan_params != nullptr);

    if (_is_jni_split(*_scan_params, options.current_range)) {

        if (_jni_reader == nullptr) {

#ifdef BE_TEST

            if (_test_jni_reader_factory) {

                _jni_reader = _test_jni_reader_factory();

            } else {

                _jni_reader = std::make_unique<format::hudi::HudiJniReader>();

            }

#else

            _jni_reader = std::make_unique<format::hudi::HudiJniReader>();

#endif

            RETURN_IF_ERROR(_init_child_reader(_jni_reader.get(), format::FileFormat::JNI));

        }

        _current_split_reader = _jni_reader.get();

    } else {

        format::FileFormat file_format;

        RETURN_IF_ERROR(_to_file_format(*_scan_params, options.current_range, &file_format));

        if (_native_reader == nullptr) {

#ifdef BE_TEST

            if (_test_native_reader_factory) {

                _native_reader = _test_native_reader_factory();

            } else {

                _native_reader = format::hudi::HudiReader::create_unique();

            }

#else

            _native_reader = format::hudi::HudiReader::create_unique();

#endif

            RETURN_IF_ERROR(_init_child_reader(_native_reader.get(), file_format));

        }

        _current_split_reader = _native_reader.get();

    }

    return Status::OK();

}

Status HudiHybridReader::_init_child_reader(format::TableReader* reader,

                                            format::FileFormat file_format) {

    DORIS_CHECK(reader != nullptr);

    VExprContextSPtrs conjuncts;

    RETURN_IF_ERROR(_clone_conjuncts(&conjuncts));

    RETURN_IF_ERROR(reader->init({

            .projected_columns = _projected_columns,

            .conjuncts = std::move(conjuncts),

            .format = file_format,

            .scan_params = _scan_params,

            .io_ctx = _io_ctx,

            .runtime_state = _runtime_state,

            .scanner_profile = _scanner_profile,

            .push_down_agg_type = _push_down_agg_type,

            .push_down_count_columns = _push_down_count_columns,

            .condition_cache_digest = _condition_cache_digest,

    }));

    // Zero means no adaptive prediction has been produced yet. Preserve the child's normal

    // runtime default until FileScannerV2 supplies the first positive prediction.

    if (_batch_size > 0) {

        reader->set_batch_size(_batch_size);

    }

    return Status::OK();

}

Status HudiHybridReader::_clone_conjuncts(VExprContextSPtrs* conjuncts) const {

    DORIS_CHECK(conjuncts != nullptr);

    conjuncts->clear();

    conjuncts->reserve(_conjuncts.size());

    for (const auto& conjunct : _conjuncts) {

        VExprSPtr root;

        RETURN_IF_ERROR(format::clone_table_expr_tree(conjunct->root(), &root));

        conjuncts->push_back(VExprContext::create_shared(std::move(root)));

    }

    return Status::OK();

}

TFileFormatType::type HudiHybridReader::_range_format_type(const TFileScanRangeParams& params,

                                                           const TFileRangeDesc& range) {

    return range.__isset.format_type ? range.format_type : params.format_type;

}

bool HudiHybridReader::_is_jni_split(const TFileScanRangeParams& params,

                                     const TFileRangeDesc& range) {

    return _range_format_type(params, range) == TFileFormatType::FORMAT_JNI;

}

Status HudiHybridReader::_to_file_format(const TFileScanRangeParams& params,

                                         const TFileRangeDesc& range,

                                         format::FileFormat* file_format) {

    DORIS_CHECK(file_format != nullptr);

    const auto format_type = _range_format_type(params, range);

    switch (format_type) {

    case TFileFormatType::FORMAT_PARQUET:

        *file_format = format::FileFormat::PARQUET;

        return Status::OK();

    case TFileFormatType::FORMAT_ORC:

        *file_format = format::FileFormat::ORC;

        return Status::OK();

    default:

        return Status::NotSupported("Unsupported native Hudi file format {}",

                                    to_string(format_type));

    }

}

} // namespace doris::format::hudi