// 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

// IWYU pragma: no_include <bits/chrono.h>

#include <fmt/format.h>

#include <gen_cpp/FrontendService.h>

#include <gen_cpp/FrontendService_types.h>

#include <gen_cpp/PaloInternalService_types.h>

#include <glog/logging.h>

#include <cstdint>

#include <functional>

#include <string>

#include <unordered_set>

#include <vector>

#include "common/status.h"

#include "core/block/block.h"

#include "core/custom_allocator.h"

#include "exec/sink/vtablet_block_convertor.h"

#include "exec/sink/vtablet_finder.h"

#include "exprs/vexpr_context.h"

#include "exprs/vexpr_fwd.h"

#include "runtime/runtime_profile.h"

#include "runtime/runtime_state.h"

#include "storage/tablet_info.h"

namespace doris {

class IndexChannel;

class VNodeChannel;

// <row_idx, partition_id, tablet_id>

class RowPartTabletIds {

public:

    DorisVector<uint32_t> row_ids;

    DorisVector<int64_t> partition_ids;

    DorisVector<int64_t> tablet_ids;

    std::string debug_string() const {

        std::string value;

        value.reserve(row_ids.size() * 15);

        for (int i = 0; i < row_ids.size(); i++) {

            value.append(fmt::format("[{}, {}, {}]", row_ids[i], partition_ids[i], tablet_ids[i]));

        }

        return value;

    }

};

// void* for caller

using CreatePartitionCallback = Status (*)(void*, TCreatePartitionResult*);

class VRowDistribution {

public:

    // only used to pass parameters for VRowDistribution

    struct VRowDistributionContext {

        RuntimeState* state = nullptr;

        OlapTableBlockConvertor* block_convertor = nullptr;

        OlapTabletFinder* tablet_finder = nullptr;

        VOlapTablePartitionParam* vpartition = nullptr;

        RuntimeProfile::Counter* add_partition_request_timer = nullptr;

        int64_t txn_id = -1;

        ObjectPool* pool = nullptr;

        OlapTableLocationParam* location = nullptr;

        const VExprContextSPtrs* vec_output_expr_ctxs = nullptr;

        std::shared_ptr<OlapTableSchemaParam> schema;

        void* caller = nullptr;

        bool write_single_replica = false;

        CreatePartitionCallback create_partition_callback;

    };

    friend class VTabletWriter;

    friend class VTabletWriterV2;

    VRowDistribution() = default;

    virtual ~VRowDistribution() = default;

    void init(VRowDistributionContext ctx) {

        _state = ctx.state;

        _batch_size = std::max(_state->batch_size(), 8192);

        _block_convertor = ctx.block_convertor;

        _tablet_finder = ctx.tablet_finder;

        _vpartition = ctx.vpartition;

        _add_partition_request_timer = ctx.add_partition_request_timer;

        _txn_id = ctx.txn_id;

        _pool = ctx.pool;

        _location = ctx.location;

        _vec_output_expr_ctxs = ctx.vec_output_expr_ctxs;

        _schema = ctx.schema;

        _caller = ctx.caller;

        _write_single_replica = ctx.write_single_replica;

        _create_partition_callback = ctx.create_partition_callback;

    }

    void output_profile_info(RuntimeProfile* profile) {

        if (!_add_partition_request_times.empty()) {

            std::stringstream ss;

            ss << "[";

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

                if (i > 0) {

                    ss << ", ";

                }

                ss << PrettyPrinter::print(_add_partition_request_times[i], TUnit::TIME_NS);

            }

            ss << "]";

            profile->add_info_string("AddPartitionRequestTimeList", ss.str());

        }

    }

    Status open(RowDescriptor* output_row_desc) {

        if (_vpartition->is_auto_partition()) {

            auto [part_ctxs, part_funcs] = _get_partition_function();

            for (auto part_ctx : part_ctxs) {

                RETURN_IF_ERROR(part_ctx->prepare(_state, *output_row_desc));

                RETURN_IF_ERROR(part_ctx->open(_state));

            }

        }

        for (const auto& index : _schema->indexes()) {

            auto& where_clause = index->where_clause;

            if (where_clause != nullptr) {

                RETURN_IF_ERROR(where_clause->prepare(_state, *output_row_desc));

                RETURN_IF_ERROR(where_clause->open(_state));

            }

        }

        return Status::OK();

    }

    // auto partition

    // mv where clause

    // v1 needs index->node->row_ids - tabletids

    // v2 needs index,tablet->rowids

    Status generate_rows_distribution(Block& input_block, std::shared_ptr<Block>& block,

                                      std::vector<RowPartTabletIds>& row_part_tablet_ids,

                                      int64_t& rows_stat_val);

    // have 2 ways remind to deal batching block:

    // 1. in row_distribution, _batching_rows reaches the threshold, this class set _deal_batched = true.

    // 2. in caller, after last block and before close, set _deal_batched = true.

    bool need_deal_batching() const { return _deal_batched && _batching_rows > 0; }

    // create partitions when need for auto-partition table using #_partitions_need_create.

    Status automatic_create_partition();

    void clear_batching_stats();

    const std::vector<bool>& get_skipped() const { return _skip; } // skipped in last round

    // for auto partition

    std::unique_ptr<MutableBlock> _batching_block; // same structure with input_block

    bool _deal_batched = false; // If true, send batched block before any block's append.

private:

    std::pair<VExprContextSPtrs, VExprSPtrs> _get_partition_function();

    Status _save_missing_values(const Block& input_block,

                                std::vector<std::vector<std::string>>& col_strs, int col_size,

                                Block* block, const std::vector<uint32_t>& filter,

                                const std::vector<const NullMap*>& col_null_maps);

    void _get_tablet_ids(Block* block, int32_t index_idx, std::vector<int64_t>& tablet_ids);

    void _filter_block_by_skip(Block* block, RowPartTabletIds& row_part_tablet_id);

    Status _filter_block_by_skip_and_where_clause(Block* block,

                                                  const VExprContextSPtr& where_clause,

                                                  RowPartTabletIds& row_part_tablet_id);

    Status _filter_block(Block* block, std::vector<RowPartTabletIds>& row_part_tablet_ids);

    Status _generate_rows_distribution_for_auto_partition(

            const Block& input_block, Block* block, const std::vector<uint16_t>& partition_col_idx,

            bool has_filtered_rows, std::vector<RowPartTabletIds>& row_part_tablet_ids,

            int64_t& rows_stat_val);

    // the whole process to deal missing rows. will call _save_missing_values

    Status _deal_missing_map(const Block& input_block, Block* block,

                             const std::vector<uint16_t>& partition_cols_idx,

                             int64_t& rows_stat_val);

    Status _generate_rows_distribution_for_non_auto_partition(

            Block* block, bool has_filtered_rows,

            std::vector<RowPartTabletIds>& row_part_tablet_ids);

    Status _generate_rows_distribution_for_auto_overwrite(

            const Block& input_block, Block* block, const std::vector<uint16_t>& partition_cols_idx,

            bool has_filtered_rows, std::vector<RowPartTabletIds>& row_part_tablet_ids,

            int64_t& rows_stat_val);

    Status _replace_overwriting_partition();

    void _reset_row_part_tablet_ids(std::vector<RowPartTabletIds>& row_part_tablet_ids,

                                    int64_t rows);

    void _reset_find_tablets(int64_t rows);

    struct NullableStringListHash {

        std::size_t _hash(const TNullableStringLiteral& arg) const {

            if (arg.is_null) {

                return 0;

            }

            return std::hash<std::string>()(arg.value);

        }

        std::size_t operator()(const std::vector<TNullableStringLiteral>& arg) const {

            std::size_t result = 0;

            for (const auto& v : arg) {

                result = (result << 1) ^ _hash(v);

            }

            return result;

        }

    };

    RuntimeState* _state = nullptr;

    int _batch_size = 0;

    // for auto partitions

    std::vector<std::vector<TNullableStringLiteral>> _partitions_need_create;

    size_t _batching_rows = 0, _batching_bytes = 0;

    std::unordered_set<std::vector<TNullableStringLiteral>, NullableStringListHash> _deduper;

    OlapTableBlockConvertor* _block_convertor = nullptr;

    OlapTabletFinder* _tablet_finder = nullptr;

    VOlapTablePartitionParam* _vpartition = nullptr;

    RuntimeProfile::Counter* _add_partition_request_timer = nullptr;

    int64_t _txn_id = -1;

    ObjectPool* _pool = nullptr;

    OlapTableLocationParam* _location = nullptr;

    // Record each auto-partition request time for detailed profiling

    std::vector<int64_t> _add_partition_request_times;

    // int64_t _number_output_rows = 0;

    const VExprContextSPtrs* _vec_output_expr_ctxs = nullptr;

    // generally it's writer's on_partitions_created

    CreatePartitionCallback _create_partition_callback = nullptr;

    void* _caller = nullptr;

    std::shared_ptr<OlapTableSchemaParam> _schema;

    bool _write_single_replica = false;

    // reuse for find_tablet. save partitions found by find_tablets

    std::vector<VOlapTablePartition*> _partitions;

    std::vector<bool> _skip;

    std::vector<uint32_t> _tablet_indexes;

    std::vector<int64_t> _tablet_ids;

    std::vector<uint32_t> _missing_map; // indice of missing values in partition_col

    // for auto detect overwrite partition

    std::set<int64_t> _new_partition_ids; // if contains, not to replace it again.

};

} // namespace doris