#include <Columns/ColumnString.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypeTuple.h>
#include <DataStreams/OneBlockInputStream.h>
#include <Interpreters/ProcessList.h>
#include <Storages/System/StorageSystemProcesses.h>
#include <Interpreters/Context.h>
#include <Interpreters/Settings.h>
#include <Interpreters/ProfileEventsExt.h>
#include <Storages/System/VirtualColumnsProcessor.h>
#include <Common/typeid_cast.h>
#include <Columns/ColumnsNumber.h>
#include <Columns/ColumnArray.h>


namespace DB
{


StorageSystemProcesses::StorageSystemProcesses(const std::string & name_)
    : name(name_)
{
    setColumns(ColumnsDescription({
        { "is_initial_query",     std::make_shared<DataTypeUInt8>() },

        { "user",                 std::make_shared<DataTypeString>() },
        { "query_id",             std::make_shared<DataTypeString>() },
        { "address",              std::make_shared<DataTypeString>() },
        { "port",                 std::make_shared<DataTypeUInt16>() },

        { "initial_user",         std::make_shared<DataTypeString>() },
        { "initial_query_id",     std::make_shared<DataTypeString>() },
        { "initial_address",      std::make_shared<DataTypeString>() },
        { "initial_port",         std::make_shared<DataTypeUInt16>() },

        { "interface",            std::make_shared<DataTypeUInt8>() },

        { "os_user",              std::make_shared<DataTypeString>() },
        { "client_hostname",      std::make_shared<DataTypeString>() },
        { "client_name",          std::make_shared<DataTypeString>() },
        { "client_version_major", std::make_shared<DataTypeUInt64>() },
        { "client_version_minor", std::make_shared<DataTypeUInt64>() },
        { "client_revision",      std::make_shared<DataTypeUInt64>() },

        { "http_method",          std::make_shared<DataTypeUInt8>() },
        { "http_user_agent",      std::make_shared<DataTypeString>() },

        { "quota_key",            std::make_shared<DataTypeString>() },

        { "elapsed",              std::make_shared<DataTypeFloat64>() },
        { "is_cancelled",         std::make_shared<DataTypeUInt8>() },
        { "read_rows",            std::make_shared<DataTypeUInt64>() },
        { "read_bytes",           std::make_shared<DataTypeUInt64>() },
        { "total_rows_approx",    std::make_shared<DataTypeUInt64>() },
        { "written_rows",         std::make_shared<DataTypeUInt64>() },
        { "written_bytes",        std::make_shared<DataTypeUInt64>() },
        { "memory_usage",         std::make_shared<DataTypeInt64>() },
        { "peak_memory_usage",    std::make_shared<DataTypeInt64>() },
        { "query",                std::make_shared<DataTypeString>() },

        { "thread_numbers",       std::make_shared<DataTypeArray>(std::make_shared<DataTypeUInt32>()) },
        { "ProfileEvents.Names",  std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>()) },
        { "ProfileEvents.Values", std::make_shared<DataTypeArray>(std::make_shared<DataTypeUInt64>()) },
        { "Settings.Names",       std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>()) },
        { "Settings.Values",      std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>()) }
    }));
}


BlockInputStreams StorageSystemProcesses::read(
    const Names & column_names,
    const SelectQueryInfo &,
    const Context & context,
    QueryProcessingStage::Enum & processed_stage,
    const size_t /*max_block_size*/,
    const unsigned /*num_streams*/)
{
    processed_stage = QueryProcessingStage::FetchColumns;
    check(column_names);

    Block res_block = getSampleBlock().cloneEmpty();
    MutableColumns res_columns = res_block.cloneEmptyColumns();

    ProcessList::Info info = context.getProcessList().getInfo(true, true, true);

    for (const auto & process : info)
    {
        size_t i = 0;
        res_columns[i++]->insert(UInt64(process.client_info.query_kind == ClientInfo::QueryKind::INITIAL_QUERY));
        res_columns[i++]->insert(process.client_info.current_user);
        res_columns[i++]->insert(process.client_info.current_query_id);
        res_columns[i++]->insert(process.client_info.current_address.host().toString());
        res_columns[i++]->insert(UInt64(process.client_info.current_address.port()));
        res_columns[i++]->insert(process.client_info.initial_user);
        res_columns[i++]->insert(process.client_info.initial_query_id);
        res_columns[i++]->insert(process.client_info.initial_address.host().toString());
        res_columns[i++]->insert(UInt64(process.client_info.initial_address.port()));
        res_columns[i++]->insert(UInt64(process.client_info.interface));
        res_columns[i++]->insert(process.client_info.os_user);
        res_columns[i++]->insert(process.client_info.client_hostname);
        res_columns[i++]->insert(process.client_info.client_name);
        res_columns[i++]->insert(process.client_info.client_version_major);
        res_columns[i++]->insert(process.client_info.client_version_minor);
        res_columns[i++]->insert(UInt64(process.client_info.client_revision));
        res_columns[i++]->insert(UInt64(process.client_info.http_method));
        res_columns[i++]->insert(process.client_info.http_user_agent);
        res_columns[i++]->insert(process.client_info.quota_key);
        res_columns[i++]->insert(process.elapsed_seconds);
        res_columns[i++]->insert(UInt64(process.is_cancelled));
        res_columns[i++]->insert(UInt64(process.read_rows));
        res_columns[i++]->insert(UInt64(process.read_bytes));
        res_columns[i++]->insert(UInt64(process.total_rows));
        res_columns[i++]->insert(UInt64(process.written_rows));
        res_columns[i++]->insert(UInt64(process.written_bytes));
        res_columns[i++]->insert(process.memory_usage);
        res_columns[i++]->insert(process.peak_memory_usage);
        res_columns[i++]->insert(process.query);

        {
            Array threads_array;
            threads_array.reserve(process.thread_numbers.size());
            for (const UInt32 thread_number : process.thread_numbers)
                threads_array.emplace_back(UInt64(thread_number));
            res_columns[i++]->insert(threads_array);
        }

        {
            IColumn * column_profile_events_names = res_columns[i++].get();
            IColumn * column_profile_events_values = res_columns[i++].get();

            if (process.profile_counters)
                ProfileEvents::dumpToArrayColumns(*process.profile_counters, column_profile_events_names, column_profile_events_values, true);
            else
            {
                column_profile_events_names->insertDefault();
                column_profile_events_values->insertDefault();
            }
        }

        {
            IColumn * column_settings_names = res_columns[i++].get();
            IColumn * column_settings_values = res_columns[i++].get();

            if (process.query_settings)
                process.query_settings->dumpToArrayColumns(column_settings_names, column_settings_values, true);
            else
            {
                column_settings_names->insertDefault();
                column_settings_values->insertDefault();
            }
        }
    }

    return BlockInputStreams(1, std::make_shared<OneBlockInputStream>(res_block.cloneWithColumns(std::move(res_columns))));
}

}