// 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 "exec/pipeline/dependency.h"

#include <memory>
#include <mutex>

#include "common/logging.h"
#include "exec/operator/multi_cast_data_streamer.h"
#include "exec/pipeline/pipeline_fragment_context.h"
#include "exec/pipeline/pipeline_task.h"
#include "exec/spill/spill_file_manager.h"
#include "exprs/vectorized_agg_fn.h"
#include "exprs/vslot_ref.h"
#include "runtime/exec_env.h"

namespace doris {

Dependency* BasicSharedState::create_source_dependency(int operator_id, int node_id,
                                                       const std::string& name) {
    source_deps.push_back(std::make_shared<Dependency>(operator_id, node_id, name + "_DEPENDENCY"));
    source_deps.back()->set_shared_state(this);
    return source_deps.back().get();
}

void BasicSharedState::create_source_dependencies(int num_sources, int operator_id, int node_id,
                                                  const std::string& name) {
    source_deps.resize(num_sources, nullptr);
    for (auto& source_dep : source_deps) {
        source_dep = std::make_shared<Dependency>(operator_id, node_id, name + "_DEPENDENCY");
        source_dep->set_shared_state(this);
    }
}

Dependency* BasicSharedState::create_sink_dependency(int dest_id, int node_id,
                                                     const std::string& name) {
    sink_deps.push_back(std::make_shared<Dependency>(dest_id, node_id, name + "_DEPENDENCY", true));
    sink_deps.back()->set_shared_state(this);
    return sink_deps.back().get();
}

void Dependency::_add_block_task(std::shared_ptr<PipelineTask> task) {
    DCHECK(_blocked_task.empty() || _blocked_task[_blocked_task.size() - 1].lock() == nullptr ||
           _blocked_task[_blocked_task.size() - 1].lock().get() != task.get())
            << "Duplicate task: " << task->debug_string();
    _blocked_task.push_back(task);
}

void Dependency::set_ready() {
    if (_ready) {
        return;
    }
    std::vector<std::weak_ptr<PipelineTask>> local_block_task {};
    {
        std::unique_lock<std::mutex> lc(_task_lock);
        if (_ready) {
            return;
        }
        _watcher.stop();
        _ready = true;
        local_block_task.swap(_blocked_task);
    }
    for (auto task : local_block_task) {
        if (auto t = task.lock()) {
            std::unique_lock<std::mutex> lc(_task_lock);
            t->wake_up(this, lc);
        }
    }
}

Dependency* Dependency::is_blocked_by(std::shared_ptr<PipelineTask> task) {
    std::unique_lock<std::mutex> lc(_task_lock);
    auto ready = _ready.load();
    if (!ready && task) {
        _add_block_task(task);
        start_watcher();
        THROW_IF_ERROR(task->blocked(this, lc));
    }
    return ready ? nullptr : this;
}

std::string Dependency::debug_string(int indentation_level) {
    fmt::memory_buffer debug_string_buffer;
    fmt::format_to(debug_string_buffer, "{}{}: id={}, block task = {}, ready={}, _always_ready={}",
                   std::string(indentation_level * 2, ' '), _name, _node_id, _blocked_task.size(),
                   _ready, _always_ready);
    return fmt::to_string(debug_string_buffer);
}

std::string CountedFinishDependency::debug_string(int indentation_level) {
    fmt::memory_buffer debug_string_buffer;
    fmt::format_to(debug_string_buffer,
                   "{}{}: id={}, block_task={}, ready={}, _always_ready={}, count={}",
                   std::string(indentation_level * 2, ' '), _name, _node_id, _blocked_task.size(),
                   _ready, _always_ready, _counter);
    return fmt::to_string(debug_string_buffer);
}

void RuntimeFilterTimer::call_timeout() {
    _parent->set_ready();
}

void RuntimeFilterTimer::call_ready() {
    _parent->set_ready();
}

// should check rf timeout in two case:
// 1. the rf is ready just remove the wait queue
// 2. if the rf have local dependency, the rf should start wait when all local dependency is ready
bool RuntimeFilterTimer::should_be_check_timeout() {
    if (!_parent->ready() && !_local_runtime_filter_dependencies.empty()) {
        bool all_ready = true;
        for (auto& dep : _local_runtime_filter_dependencies) {
            if (!dep->ready()) {
                all_ready = false;
                break;
            }
        }
        if (all_ready) {
            _local_runtime_filter_dependencies.clear();
            _registration_time = MonotonicMillis();
        }
        return all_ready;
    }
    return true;
}

void RuntimeFilterTimerQueue::start() {
    while (!_stop) {
        std::unique_lock<std::mutex> lk(cv_m);

        while (_que.empty() && !_stop) {
            cv.wait_for(lk, std::chrono::seconds(3), [this] { return !_que.empty() || _stop; });
        }
        if (_stop) {
            break;
        }
        {
            std::unique_lock<std::mutex> lc(_que_lock);
            std::list<std::shared_ptr<RuntimeFilterTimer>> new_que;
            for (auto& it : _que) {
                if (it.use_count() == 1) {
                    // `use_count == 1` means this runtime filter has been released
                } else if (it->should_be_check_timeout()) {
                    if (it->force_wait_timeout() || it->_parent->is_blocked_by()) {
                        // This means runtime filter is not ready, so we call timeout or continue to poll this timer.
                        int64_t ms_since_registration = MonotonicMillis() - it->registration_time();
                        if (ms_since_registration > it->wait_time_ms()) {
                            it->call_timeout();
                        } else {
                            new_que.push_back(std::move(it));
                        }
                    }
                } else {
                    new_que.push_back(std::move(it));
                }
            }
            new_que.swap(_que);
        }
        std::this_thread::sleep_for(std::chrono::milliseconds(interval));
    }
    _shutdown = true;
}

void LocalExchangeSharedState::sub_running_sink_operators() {
    std::unique_lock<std::mutex> lc(le_lock);
    if (exchanger->_running_sink_operators.fetch_sub(1) == 1) {
        _set_always_ready();
    }
}

void LocalExchangeSharedState::sub_running_source_operators() {
    std::unique_lock<std::mutex> lc(le_lock);
    if (exchanger->_running_source_operators.fetch_sub(1) == 1) {
        _set_always_ready();
        exchanger->finalize();
    }
}

LocalExchangeSharedState::LocalExchangeSharedState(int num_instances) {
    source_deps.resize(num_instances, nullptr);
    mem_counters.resize(num_instances, nullptr);
}

MutableColumns AggSharedState::_get_keys_hash_table() {
    return std::visit(
            Overload {[&](std::monostate& arg) {
                          throw doris::Exception(ErrorCode::INTERNAL_ERROR, "uninited hash table");
                          return MutableColumns();
                      },
                      [&](auto&& agg_method) -> MutableColumns {
                          MutableColumns key_columns;
                          for (int i = 0; i < probe_expr_ctxs.size(); ++i) {
                              key_columns.emplace_back(
                                      probe_expr_ctxs[i]->root()->data_type()->create_column());
                          }
                          auto& data = *agg_method.hash_table;
                          bool has_null_key = data.has_null_key_data();
                          const auto size = data.size() - has_null_key;
                          using KeyType = std::decay_t<decltype(agg_method)>::Key;
                          std::vector<KeyType> keys(size);

                          uint32_t num_rows = 0;
                          auto iter = aggregate_data_container->begin();
                          {
                              while (iter != aggregate_data_container->end()) {
                                  keys[num_rows] = iter.get_key<KeyType>();
                                  ++iter;
                                  ++num_rows;
                              }
                          }
                          agg_method.insert_keys_into_columns(keys, key_columns, num_rows);
                          if (has_null_key) {
                              key_columns[0]->insert_data(nullptr, 0);
                          }
                          return key_columns;
                      }},
            agg_data->method_variant);
}

void AggSharedState::build_limit_heap(size_t hash_table_size) {
    limit_columns = _get_keys_hash_table();
    for (size_t i = 0; i < hash_table_size; ++i) {
        limit_heap.emplace(i, limit_columns, order_directions, null_directions);
    }
    while (hash_table_size > limit) {
        limit_heap.pop();
        hash_table_size--;
    }
    limit_columns_min = limit_heap.top()._row_id;
}

bool AggSharedState::do_limit_filter(Block* block, size_t num_rows,
                                     const std::vector<int>* key_locs) {
    if (num_rows) {
        cmp_res.resize(num_rows);
        need_computes.resize(num_rows);
        memset(need_computes.data(), 0, need_computes.size());
        memset(cmp_res.data(), 0, cmp_res.size());

        const auto key_size = null_directions.size();
        for (int i = 0; i < key_size; i++) {
            block->get_by_position(key_locs ? key_locs->operator[](i) : i)
                    .column->compare_internal(limit_columns_min, *limit_columns[i],
                                              null_directions[i], order_directions[i], cmp_res,
                                              need_computes.data());
        }

        auto set_computes_arr = [](auto* __restrict res, auto* __restrict computes, size_t rows) {
            for (size_t i = 0; i < rows; ++i) {
                computes[i] = computes[i] == res[i];
            }
        };
        set_computes_arr(cmp_res.data(), need_computes.data(), num_rows);

        return std::find(need_computes.begin(), need_computes.end(), 0) != need_computes.end();
    }

    return false;
}

Status AggSharedState::reset_hash_table() {
    return std::visit(
            Overload {
                    [&](std::monostate& arg) -> Status {
                        return Status::InternalError("Uninited hash table");
                    },
                    [&](auto& agg_method) {
                        auto& hash_table = *agg_method.hash_table;
                        using HashTableType = std::decay_t<decltype(hash_table)>;

                        agg_method.arena.clear();
                        agg_method.inited_iterator = false;

                        if (!use_simple_count) {
                            hash_table.for_each_mapped([&](auto& mapped) {
                                if (mapped) {
                                    _destroy_agg_status(mapped);
                                    mapped = nullptr;
                                }
                            });

                            if (hash_table.has_null_key_data()) {
                                _destroy_agg_status(
                                        hash_table.template get_null_key_data<AggregateDataPtr>());
                            }

                            aggregate_data_container.reset(new AggregateDataContainer(
                                    sizeof(typename HashTableType::key_type),
                                    ((total_size_of_aggregate_states + align_aggregate_states - 1) /
                                     align_aggregate_states) *
                                            align_aggregate_states));
                        }
                        agg_method.hash_table.reset(new HashTableType());
                        return Status::OK();
                    }},
            agg_data->method_variant);
}

void PartitionedAggSharedState::close() {
    bool false_close = false;
    if (!is_closed.compare_exchange_strong(false_close, true)) {
        return;
    }

    for (auto& partition : _spill_partitions) {
        if (partition) {
            ExecEnv::GetInstance()->spill_file_mgr()->delete_spill_file(partition);
        }
    }
    _spill_partitions.clear();
}

void SpillSortSharedState::close() {
    // need to use CAS instead of only `if (!is_closed)` statement,
    // to avoid concurrent entry of close() both pass the if statement
    bool false_close = false;
    if (!is_closed.compare_exchange_strong(false_close, true)) {
        return;
    }
    DCHECK(!false_close && is_closed);
    sorted_spill_groups.clear();
}

MultiCastSharedState::MultiCastSharedState(ObjectPool* pool, int cast_sender_count, int node_id)
        : multi_cast_data_streamer(
                  std::make_unique<MultiCastDataStreamer>(pool, cast_sender_count, node_id)) {}

int AggSharedState::get_slot_column_id(const AggFnEvaluator* evaluator) {
    auto ctxs = evaluator->input_exprs_ctxs();
    CHECK(ctxs.size() == 1 && ctxs[0]->root()->is_slot_ref())
            << "input_exprs_ctxs is invalid, input_exprs_ctx[0]="
            << ctxs[0]->root()->debug_string();
    return ((VSlotRef*)ctxs[0]->root().get())->column_id();
}

void AggSharedState::_destroy_agg_status(AggregateDataPtr data) {
    for (int i = 0; i < aggregate_evaluators.size(); ++i) {
        aggregate_evaluators[i]->function()->destroy(data + offsets_of_aggregate_states[i]);
    }
}

void BucketedAggSharedState::_destroy_agg_status(AggregateDataPtr data) {
    DCHECK(!use_simple_count) << "should not call _destroy_agg_status when use_simple_count";
    for (int i = 0; i < aggregate_evaluators.size(); ++i) {
        aggregate_evaluators[i]->function()->destroy(data + offsets_of_aggregate_states[i]);
    }
}

LocalExchangeSharedState::~LocalExchangeSharedState() = default;

Status SetSharedState::update_build_not_ignore_null(const VExprContextSPtrs& ctxs) {
    if (ctxs.size() > build_not_ignore_null.size()) {
        return Status::InternalError("build_not_ignore_null not initialized");
    }

    for (int i = 0; i < ctxs.size(); ++i) {
        build_not_ignore_null[i] = build_not_ignore_null[i] || ctxs[i]->root()->is_nullable();
    }

    return Status::OK();
}

size_t SetSharedState::get_hash_table_size() const {
    size_t hash_table_size = 0;
    std::visit(
            [&](auto&& arg) {
                using HashTableCtxType = std::decay_t<decltype(arg)>;
                if constexpr (!std::is_same_v<HashTableCtxType, std::monostate>) {
                    hash_table_size = arg.hash_table->size();
                }
            },
            hash_table_variants->method_variant);
    return hash_table_size;
}

Status SetSharedState::hash_table_init() {
    std::vector<DataTypePtr> data_types;
    for (size_t i = 0; i != child_exprs_lists[0].size(); ++i) {
        auto& ctx = child_exprs_lists[0][i];
        auto data_type = ctx->root()->data_type();
        if (build_not_ignore_null[i]) {
            data_type = make_nullable(data_type);
        }
        data_types.emplace_back(std::move(data_type));
    }
    return init_hash_method<SetDataVariants>(hash_table_variants.get(), data_types, true);
}

void AggSharedState::refresh_top_limit(size_t row_id, const ColumnRawPtrs& key_columns) {
    for (int j = 0; j < key_columns.size(); ++j) {
        limit_columns[j]->insert_from(*key_columns[j], row_id);
    }
    limit_heap.emplace(limit_columns[0]->size() - 1, limit_columns, order_directions,
                       null_directions);

    limit_heap.pop();
    limit_columns_min = limit_heap.top()._row_id;
}

} // namespace doris