#include <sstream>

#include <Common/CurrentThread.h>
#include <Common/Exception.h>
#include <Common/ThreadProfileEvents.h>
#include <Common/TaskStatsInfoGetter.h>
#include <Common/ThreadStatus.h>

#include <Poco/Logger.h>
#include <common/getThreadNumber.h>


namespace DB
{


namespace ErrorCodes
{
    extern const int LOGICAL_ERROR;
    extern const int PTHREAD_ERROR;
}


thread_local ThreadStatus * current_thread = nullptr;


TasksStatsCounters TasksStatsCounters::current()
{
    TasksStatsCounters res;
    CurrentThread::get().taskstats_getter->getStat(res.stat, CurrentThread::get().os_thread_id);
    return res;
}

ThreadStatus::ThreadStatus()
{
    thread_number = getThreadNumber();
    os_thread_id = TaskStatsInfoGetter::getCurrentTID();

    last_rusage = std::make_unique<RUsageCounters>();
    last_taskstats = std::make_unique<TasksStatsCounters>();

    memory_tracker.setDescription("(for thread)");
    log = &Poco::Logger::get("ThreadStatus");

    current_thread = this;

    /// NOTE: It is important not to do any non-trivial actions (like updating ProfileEvents or logging) before ThreadStatus is created
    /// Otherwise it could lead to SIGSEGV due to current_thread dereferencing
}

ThreadStatus::~ThreadStatus()
{
    if (untracked_memory > 0)
        memory_tracker.alloc(untracked_memory);
    else
        memory_tracker.free(-untracked_memory);

    if (deleter)
        deleter();
    current_thread = nullptr;
}

void ThreadStatus::initPerformanceCounters()
{
    performance_counters_finalized = false;

    /// Clear stats from previous query if a new query is started
    /// TODO: make separate query_thread_performance_counters and thread_performance_counters
    performance_counters.resetCounters();
    memory_tracker.resetCounters();
    memory_tracker.setDescription("(for thread)");

    query_start_time_nanoseconds = getCurrentTimeNanoseconds();
    query_start_time = time(nullptr);
    ++queries_started;

    *last_rusage = RUsageCounters::current(query_start_time_nanoseconds);

    try
    {
        if (TaskStatsInfoGetter::checkPermissions())
        {
            if (!taskstats_getter)
                taskstats_getter = std::make_unique<TaskStatsInfoGetter>();

            *last_taskstats = TasksStatsCounters::current();
        }
    }
    catch (...)
    {
        taskstats_getter.reset();
        tryLogCurrentException(__PRETTY_FUNCTION__);
    }
}

void ThreadStatus::updatePerformanceCounters()
{
    try
    {
        RUsageCounters::updateProfileEvents(*last_rusage, performance_counters);
        if (taskstats_getter)
            TasksStatsCounters::updateProfileEvents(*last_taskstats, performance_counters);
    }
    catch (...)
    {
        tryLogCurrentException(log);
    }
}

void ThreadStatus::assertState(const std::initializer_list<int> & permitted_states, const char * description)
{
    for (auto permitted_state : permitted_states)
    {
        if (getCurrentState() == permitted_state)
            return;
    }

    std::stringstream ss;
    ss << "Unexpected thread state " << getCurrentState();
    if (description)
        ss << ": " << description;
    throw Exception(ss.str(), ErrorCodes::LOGICAL_ERROR);
}

void ThreadStatus::attachInternalTextLogsQueue(const InternalTextLogsQueuePtr & logs_queue)
{
    logs_queue_ptr = logs_queue;

    if (!thread_group)
        return;

    std::lock_guard lock(thread_group->mutex);
    thread_group->logs_queue_ptr = logs_queue;
}

}