/* Copyright (C) 2014 InfiniDB, Inc.
   Copyright (C) 2016 MariaDB Corporation

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

#define NEED_CALPONT_INTERFACE
#include "ha_mcs_impl.h"

#include "ha_mcs_impl_if.h"
using namespace cal_impl_if;

#include "configcpp.h"
using namespace config;
#include "brmtypes.h"
using namespace BRM;
#include "bytestream.h"
using namespace messageqcpp;
#include "liboamcpp.h"
using namespace oam;
#include "cacheutils.h"

#include "errorcodes.h"
#include "idberrorinfo.h"
#include "errorids.h"
using namespace logging;

//#include "resourcemanager.h"

#include "columnstoreversion.h"
#include "ha_mcs_sysvars.h"

extern "C"
{
#define MAXSTRINGLENGTH 50

    const char* PmSmallSideMaxMemory = "pmmaxmemorysmallside";

    const char* SetParmsPrelude = "Updated ";
    const char* SetParmsError = "Invalid parameter: ";
    const char* InvalidParmSize = "Invalid parameter size: Input value cannot be larger than ";

    const size_t Plen = strlen(SetParmsPrelude);
    const size_t Elen = strlen(SetParmsError);

    const char* invalidParmSizeMessage(uint64_t size, size_t& len)
    {
        static char str[sizeof(InvalidParmSize) + 12] = {0};
        std::ostringstream os;
        os << InvalidParmSize << size;
        len = os.str().length();
        strcpy(str, os.str().c_str());
        return str;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    const char* calsetparms(UDF_INIT* initid, UDF_ARGS* args,
                            char* result, unsigned long* length,
                            char* is_null, char* error)
    {
        char parameter[MAXSTRINGLENGTH];
        char valuestr[MAXSTRINGLENGTH];
        size_t plen = args->lengths[0];
        size_t vlen = args->lengths[1];

        memcpy(parameter, args->args[0], plen);
        memcpy(valuestr, args->args[1], vlen);

        parameter[plen] = '\0';
        valuestr[vlen] = '\0';

        uint64_t value = Config::uFromText(valuestr);

        THD* thd = current_thd;
        uint32_t sessionID = execplan::CalpontSystemCatalog::idb_tid2sid(thd->thread_id);

        const char* msg = SetParmsError;
        size_t mlen = Elen;
        bool includeInput = true;

        std::string pstr(parameter);
        boost::algorithm::to_lower(pstr);

        if (get_fe_conn_info_ptr() == NULL)
            set_fe_conn_info_ptr((void*)new cal_connection_info());

        cal_connection_info* ci = reinterpret_cast<cal_connection_info*>(get_fe_conn_info_ptr());
        idbassert(ci != 0);

        if (pstr == PmSmallSideMaxMemory)
        {
            joblist::ResourceManager* rm = joblist::ResourceManager::instance();

            if (rm->getHjTotalUmMaxMemorySmallSide() >= value)
            {
                ci->rmParms.push_back(execplan::RMParam(sessionID, execplan::PMSMALLSIDEMEMORY, value));

                msg = SetParmsPrelude;
                mlen = Plen;
            }
            else
            {
                msg = invalidParmSizeMessage(rm->getHjTotalUmMaxMemorySmallSide(), mlen);
                includeInput = false;
            }
        }

        memcpy(result, msg, mlen);

        if (includeInput)
        {
            memcpy(result + mlen, parameter, plen);
            mlen += plen;
            memcpy(result + mlen++, " ", 1);
            memcpy(result + mlen, valuestr, vlen);
            *length = mlen + vlen;
        }
        else
            *length = mlen;

        return result;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool calsetparms_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        if (args->arg_count != 2 || args->arg_type[0] != STRING_RESULT || args->arg_type[1] != STRING_RESULT)
        {
            strcpy(message, "CALSETPARMS() requires two string arguments");
            return 1;
        }

        initid->max_length = MAXSTRINGLENGTH;

        char valuestr[MAXSTRINGLENGTH];
        size_t vlen = args->lengths[1];

        memcpy(valuestr, args->args[1], vlen--);

        for (size_t i = 0; i < vlen; ++i)
            if (!isdigit(valuestr[i]))
            {
                strcpy(message, "CALSETPARMS() second argument must be numeric or end in G, M or K");
                return 1;
            }

        if (!isdigit(valuestr[vlen]))
        {
            switch (valuestr[vlen])
            {
                case 'G':
                case 'g':
                case 'M':
                case 'm':
                case 'K':
                case 'k':
                case '\0':
                    break;

                default:
                    strcpy(message, "CALSETPARMS() second argument must be numeric or end in G, M or K");
                    return 1;
            }
        }

        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void calsetparms_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    const char* calgetstats(UDF_INIT* initid, UDF_ARGS* args,
                            char* result, unsigned long* length,
                            char* is_null, char* error)
    {
        if (get_fe_conn_info_ptr() == NULL)
            set_fe_conn_info_ptr((void*)new cal_connection_info());

        cal_connection_info* ci = reinterpret_cast<cal_connection_info*>(get_fe_conn_info_ptr());

        unsigned long l = ci->queryStats.size();

        if (l == 0)
        {
            *is_null = 1;
            return 0;
        }

        if (l > 255) l = 255;

        memcpy(result, ci->queryStats.c_str(), l);
        *length = l;
        return result;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool calgetstats_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        if (args->arg_count != 0)
        {
            strcpy(message, "CALGETSTATS() takes no arguments");
            return 1;
        }

        initid->maybe_null = 1;
        initid->max_length = 255;

        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void calgetstats_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    long long calsettrace(UDF_INIT* initid, UDF_ARGS* args,
                          char* is_null, char* error)
    {
        if (get_fe_conn_info_ptr() == NULL)
            set_fe_conn_info_ptr((void*)new cal_connection_info());

        cal_connection_info* ci = reinterpret_cast<cal_connection_info*>(get_fe_conn_info_ptr());

        long long oldTrace = ci->traceFlags;
        ci->traceFlags = (uint32_t)(*((long long*)args->args[0]));
        // keep the vtablemode bit
        ci->traceFlags |= (oldTrace & execplan::CalpontSelectExecutionPlan::TRACE_TUPLE_OFF);
        ci->traceFlags |= (oldTrace & execplan::CalpontSelectExecutionPlan::TRACE_TUPLE_AUTOSWITCH);
        return oldTrace;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool calsettrace_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        if (args->arg_count != 1 || args->arg_type[0] != INT_RESULT)
        {
            strcpy(message, "CALSETTRACE() requires one INTEGER argument");
            return 1;
        }

        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void calsettrace_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
// Return 1 if system is ready for reads or 0 if not.
    long long mcssystemready(UDF_INIT* initid, UDF_ARGS* args,
                             char* is_null, char* error)
    {
        long long rtn = 0;
        Oam oam;
        DBRM dbrm(true);
        SystemStatus systemstatus;

        try
        {
            if (dbrm.getSystemReady()
                && dbrm.getSystemQueryReady())
            {
                return 1;
            }
        }
        catch (...)
        {
            *error = 1;
        }

        return rtn;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool mcssystemready_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void mcssystemready_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
// Return non-zero if system is read only; 0 if writeable
    long long mcssystemreadonly(UDF_INIT* initid, UDF_ARGS* args,
                                char* is_null, char* error)
    {
        long long rtn = 0;
        DBRM dbrm(true);

        try
        {
            if (dbrm.getSystemSuspended())
            {
                rtn = 1;
            }

            if (dbrm.isReadWrite() > 0) // Returns 0 for writable, 5 for read only
            {
                rtn = 2;
            }
        }
        catch (...)
        {
            *error = 1;
            rtn = 1;
        }

        return rtn;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool mcssystemreadonly_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void mcssystemreadonly_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
// Return non-zero if this is the primary UM; 0 if not primary
    long long mcssystemprimary(UDF_INIT* initid, UDF_ARGS* args,
                                char* is_null, char* error)
    {
        long long rtn = 0;
        Oam oam;
        std::string PrimaryUMModuleName;
        std::string localModule;
        oamModuleInfo_t st;

        try
        {
            st = oam.getModuleInfo();
            localModule = boost::get<0>(st);
            PrimaryUMModuleName = config::Config::makeConfig()->getConfig("SystemConfig", "PrimaryUMModuleName");

            if (boost::iequals(localModule, PrimaryUMModuleName))
                rtn = 1;
            if (PrimaryUMModuleName == "unassigned")
                rtn = 1;
        }
        catch (std::runtime_error& e)
        {
            // It's difficult to return an error message from a numerical UDF
            //string msg = string("ERROR: Problem getting Primary UM Module Name. ") + e.what();
            *error = 1;
        }
        catch (...)
        {
            *error = 1;
        }
        return rtn;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool mcssystemprimary_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void mcssystemprimary_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool calviewtablelock_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        if (args->arg_count == 2 && (args->arg_type[0] != STRING_RESULT || args->arg_type[1] != STRING_RESULT))
        {
            strcpy(message, "CALVIEWTABLELOCK() requires two string arguments");
            return 1;
        }
        else if ((args->arg_count == 1) && (args->arg_type[0] != STRING_RESULT ) )
        {
            strcpy(message, "CALVIEWTABLELOCK() requires one string argument");
            return 1;
        }
        else if (args->arg_count > 2 )
        {
            strcpy(message, "CALVIEWTABLELOCK() takes one or two arguments only");
            return 1;
        }
        else if (args->arg_count == 0 )
        {
            strcpy(message, "CALVIEWTABLELOCK() requires at least one argument");
            return 1;
        }

        initid->maybe_null = 1;
        initid->max_length = 255;

        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    const char* calviewtablelock(UDF_INIT* initid, UDF_ARGS* args,
                                 char* result, unsigned long* length,
                                 char* is_null, char* error)
    {
        THD* thd = current_thd;

        if (get_fe_conn_info_ptr() == NULL)
            set_fe_conn_info_ptr((void*)new cal_connection_info());

        cal_connection_info* ci = reinterpret_cast<cal_connection_info*>(get_fe_conn_info_ptr());
        execplan::CalpontSystemCatalog::TableName tableName;

        if ( args->arg_count == 2 )
        {
            tableName.schema = args->args[0];
            tableName.table = args->args[1];
        }
        else if ( args->arg_count == 1 )
        {
            tableName.table = args->args[0];

            if (thd->db.length)
            {
                tableName.schema = thd->db.str;
            }
            else
            {
              std::string msg("No schema information provided");
                memcpy(result, msg.c_str(), msg.length());
                *length = msg.length();
                return result;
            }
        }
        if (lower_case_table_names)
        {
            boost::algorithm::to_lower(tableName.schema);
            boost::algorithm::to_lower(tableName.table);
        }

        if ( !ci->dmlProc )
        {
            ci->dmlProc = new MessageQueueClient("DMLProc");
            //cout << "viewtablelock starts a new client " << ci->dmlProc << " for session " << thd->thread_id << endl;
        }

        std::string lockinfo = ha_mcs_impl_viewtablelock(*ci, tableName);

        memcpy(result, lockinfo.c_str(), lockinfo.length());
        *length = lockinfo.length();
        return result;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void calviewtablelock_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool calcleartablelock_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        if ((args->arg_count != 1) || (args->arg_type[0] != INT_RESULT))
        {
            strcpy(message,
                   "CALCLEARTABLELOCK() requires one integer argument (the lockID)");
            return 1;
        }

        initid->maybe_null = 1;
        initid->max_length = 255;

        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    const char* calcleartablelock(UDF_INIT* initid, UDF_ARGS* args,
                                  char* result, unsigned long* length,
                                  char* is_null, char* error)
    {
        if (get_fe_conn_info_ptr() == NULL)
            set_fe_conn_info_ptr((void*)new cal_connection_info());

        cal_connection_info* ci = reinterpret_cast<cal_connection_info*>(
                                      get_fe_conn_info_ptr());
        long long lockID = *reinterpret_cast<long long*>(args->args[0]);

        if ( !ci->dmlProc )
        {
            ci->dmlProc = new MessageQueueClient("DMLProc");
            //cout << "cleartablelock starts a new client " << ci->dmlProc << " for session " << thd->thread_id << endl;
        }

        unsigned long long uLockID = lockID;
        std::string lockinfo = ha_mcs_impl_cleartablelock(*ci, uLockID);

        memcpy(result, lockinfo.c_str(), lockinfo.length());
        *length = lockinfo.length();
        return result;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void calcleartablelock_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool callastinsertid_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        if (args->arg_count == 2 && (args->arg_type[0] != STRING_RESULT || args->arg_type[1] != STRING_RESULT))
        {
            strcpy(message, "CALLASTINSRTID() requires two string arguments");
            return 1;
        }
        else if ((args->arg_count == 1) && (args->arg_type[0] != STRING_RESULT ) )
        {
            strcpy(message, "CALLASTINSERTID() requires one string argument");
            return 1;
        }
        else if (args->arg_count > 2 )
        {
            strcpy(message, "CALLASTINSERTID() takes one or two arguments only");
            return 1;
        }
        else if (args->arg_count == 0 )
        {
            strcpy(message, "CALLASTINSERTID() requires at least one argument");
            return 1;
        }

        initid->maybe_null = 1;
        initid->max_length = 255;

        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    long long callastinsertid(UDF_INIT* initid, UDF_ARGS* args,
                              char* is_null, char* error)
    {
        THD* thd = current_thd;

        execplan::CalpontSystemCatalog::TableName tableName;
        uint64_t nextVal = 0;

        if ( args->arg_count == 2 )
        {
            tableName.schema = args->args[0];
            tableName.table = args->args[1];
        }
        else if ( args->arg_count == 1 )
        {
            tableName.table = args->args[0];

            if (thd->db.length)
                tableName.schema = thd->db.str;
            else
            {
                return -1;
            }
        }
        if (lower_case_table_names)
        {
            boost::algorithm::to_lower(tableName.schema);
            boost::algorithm::to_lower(tableName.table);
        }

        boost::shared_ptr<execplan::CalpontSystemCatalog> csc =
            execplan::CalpontSystemCatalog::makeCalpontSystemCatalog(
                execplan::CalpontSystemCatalog::idb_tid2sid(thd->thread_id));
        csc->identity(execplan::CalpontSystemCatalog::FE);

        try
        {
            nextVal = csc->nextAutoIncrValue(tableName);
        }
        catch (std::exception&)
        {
          std::string msg("No such table found during autincrement");
            setError(thd, ER_INTERNAL_ERROR, msg);
            return nextVal;
        }

        if (nextVal == AUTOINCR_SATURATED)
        {
            setError(thd, ER_INTERNAL_ERROR, IDBErrorInfo::instance()->errorMsg(ERR_EXCEED_LIMIT));
            return nextVal;
        }

        //@Bug 3559. Return a message for table without autoincrement column.
        if (nextVal == 0)
        {
          std::string msg("Autoincrement does not exist for this table.");
            setError(thd, ER_INTERNAL_ERROR, msg);
            return nextVal;
        }

        return (nextVal - 1);
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void callastinsertid_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void calflushcache_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    long long calflushcache(UDF_INIT* initid, UDF_ARGS* args,
                            char* is_null, char* error)
    {
        return static_cast<long long>(cacheutils::flushPrimProcCache());
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool calflushcache_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        if (args->arg_count != 0)
        {
            strcpy(message, "CALFLUSHCACHE() takes no arguments");
            return 1;
        }

        return 0;
    }

    static const unsigned long TraceSize = 16 * 1024;

//mysqld will call this with only 766 bytes available in result no matter what we asked for in calgettrace_init()
// if we return a pointer that is not result, mysqld will take our pointer and use it, freeing up result
#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    const char* calgettrace(UDF_INIT* initid, UDF_ARGS* args,
                            char* result, unsigned long* length,
                            char* is_null, char* error)
    {
        const std::string* msgp;
        int flags = 0;

        if (args->arg_count > 0)
        {
            if (args->arg_type[0] == INT_RESULT)
            {
                flags = *reinterpret_cast<int*>(args->args[0]);
            }
        }

        if (get_fe_conn_info_ptr() == NULL)
            set_fe_conn_info_ptr((void*)new cal_connection_info());

        cal_connection_info* ci = reinterpret_cast<cal_connection_info*>(get_fe_conn_info_ptr());

        if (flags > 0)
            //msgp = &connMap[sessionID].extendedStats;
            msgp = &ci->extendedStats;
        else
            //msgp = &connMap[sessionID].miniStats;
            msgp = &ci->miniStats;

        unsigned long l = msgp->size();

        if (l == 0)
        {
            *is_null = 1;
            return 0;
        }

        if (l > TraceSize) l = TraceSize;

        *length = l;
        return msgp->c_str();
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool calgettrace_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
#if 0

        if (args->arg_count != 0)
        {
            strcpy(message, "CALGETTRACE() takes no arguments");
            return 1;
        }

#endif
        initid->maybe_null = 1;
        initid->max_length = TraceSize;

        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void calgettrace_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    const char* calgetversion(UDF_INIT* initid, UDF_ARGS* args,
                              char* result, unsigned long* length,
                              char* is_null, char* error)
    {
      std::string version(columnstore_version);
        *length = version.size();
        memcpy(result, version.c_str(), *length);
        return result;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool calgetversion_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        if (args->arg_count != 0)
        {
            strcpy(message, "CALGETVERSION() takes no arguments");
            return 1;
        }

        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void calgetversion_deinit(UDF_INIT* initid)
    {
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    const char* calgetsqlcount(UDF_INIT* initid, UDF_ARGS* args,
                               char* result, unsigned long* length,
                               char* is_null, char* error)
    {
        if (get_fe_conn_info_ptr() == NULL)
            set_fe_conn_info_ptr((void*)new cal_connection_info());

        cal_connection_info* ci = reinterpret_cast<cal_connection_info*>(get_fe_conn_info_ptr());
        idbassert(ci != 0);

        MessageQueueClient* mqc = 0;
        mqc = new MessageQueueClient("ExeMgr1");

        ByteStream msg;
        ByteStream::quadbyte runningSql, waitingSql;
        ByteStream::quadbyte qb = 5;
        msg << qb;
        mqc->write(msg);

        //get ExeMgr response
        msg.restart();
        msg = mqc->read();

        if (msg.length() == 0)
        {
            memcpy(result, "Lost connection to ExeMgr", *length);
            return result;
        }

        msg >> runningSql;
        msg >> waitingSql;
        delete mqc;

        char ans[128];
        sprintf(ans, "Running SQL statements %d, Waiting SQL statments %d", runningSql, waitingSql);
        *length = strlen(ans);
        memcpy(result, ans, *length);
        return result;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    my_bool calgetsqlcount_init(UDF_INIT* initid, UDF_ARGS* args, char* message)
    {
        if (args->arg_count != 0)
        {
            strcpy(message, "CALGETSQLCOUNT() takes no arguments");
            return 1;
        }

        return 0;
    }

#ifdef _MSC_VER
    __declspec(dllexport)
#endif
    void calgetsqlcount_deinit(UDF_INIT* initid)
    {
    }


} //extern "C"