/*
 * ZoneMinder Logger Implementation, $Date$, $Revision$
 * Copyright (C) 2001-2008 Philip Coombes
 * 
 * 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; either version 2
 * of the License, or (at your option) any later version.
 * 
 * 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.
*/ 

#include "zm_logger.h"

#include "zm_config.h"
#include "zm_utils.h"
#include "zm_db.h"

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <syslog.h>
#include <signal.h>
#include <stdarg.h>
#include <errno.h>
#include <libgen.h>
#ifdef __FreeBSD__
#include <sys/thr.h>
#endif

bool Logger::smInitialised = false;
Logger *Logger::smInstance = 0;

Logger::StringMap Logger::smCodes;
Logger::IntMap Logger::smSyslogPriorities;

#if 0
static void subtractTime( struct timeval * const tp1, struct timeval * const tp2 ) {
  tp1->tv_sec -= tp2->tv_sec;
  if ( tp1->tv_usec <= tp2->tv_usec ) {
    tp1->tv_sec--;
    tp1->tv_usec = 1000000 - (tp2->tv_usec - tp1->tv_usec);
  } else {
    tp1->tv_usec = tp1->tv_usec - tp2->tv_usec;
  }
}
#endif

void Logger::usrHandler( int sig ) {
  Logger *logger = fetch();
  if ( sig == SIGUSR1 )
    logger->level( logger->level()+1 );
  else if ( sig == SIGUSR2 )
    logger->level( logger->level()-1 );
  Info("Logger - Level changed to %d", logger->level());
}

Logger::Logger() :
  mLevel(INFO),
  mTerminalLevel(NOLOG),
  mDatabaseLevel(NOLOG),
  mFileLevel(NOLOG),
  mSyslogLevel(NOLOG),
  mEffectiveLevel(NOLOG),
  //mLogPath( staticConfig.PATH_LOGS.c_str() ),
  //mLogFile( mLogPath+"/"+mId+".log" ),
  mDbConnected(false),
  mLogFileFP(NULL),
  mHasTerminal(false),
  mFlush(false) {

  if ( smInstance ) {
    Panic( "Attempt to create second instance of Logger class" );
  }

  if ( !smInitialised ) {
    smCodes[INFO] = "INF";
    smCodes[WARNING] = "WAR";
    smCodes[ERROR] = "ERR";
    smCodes[FATAL] = "FAT";
    smCodes[PANIC] = "PNC";
    smCodes[NOLOG] = "OFF";

    smSyslogPriorities[INFO] = LOG_INFO;
    smSyslogPriorities[WARNING] = LOG_WARNING;
    smSyslogPriorities[ERROR] = LOG_ERR;
    smSyslogPriorities[FATAL] = LOG_ERR;
    smSyslogPriorities[PANIC] = LOG_ERR;

    char code[4] = "";
    for ( int i = DEBUG1; i <= DEBUG9; i++ ) {
      snprintf(code, sizeof(code), "DB%d", i);
      smCodes[i] = code;
      smSyslogPriorities[i] = LOG_DEBUG;
    }

    smInitialised = true;
  }

  if ( fileno(stderr) && isatty(fileno(stderr)) )
    mHasTerminal = true;
}

Logger::~Logger() {
  terminate();
  smCodes.clear();
  smSyslogPriorities.clear();
  smInitialised = false;
#if 0
  for ( StringMap::iterator itr = smCodes.begin(); itr != smCodes.end(); itr ++ ) {
      smCodes.erase( itr );
  }
  for ( IntMap::iterator itr = smSyslogPriorities.begin(); itr != smSyslogPriorities.end(); itr ++ ) {
      smSyslogPriorities.erase(itr);
  }
#endif
}

void Logger::initialise(const std::string &id, const Options &options) {
  char *envPtr;

  if ( !id.empty() )
    this->id(id);

  std::string tempLogFile;

  if ( (envPtr = getTargettedEnv("LOG_FILE")) )
    tempLogFile = envPtr;
  else if ( options.mLogFile.size() )
    tempLogFile = options.mLogFile;
  else {
    if ( options.mLogPath.size() ) {
      mLogPath = options.mLogPath;
    }
    tempLogFile = mLogPath+"/"+mId+".log";
  }

  Level tempLevel = INFO;
  Level tempTerminalLevel = mTerminalLevel;
  Level tempDatabaseLevel = mDatabaseLevel;
  Level tempFileLevel = mFileLevel;
  Level tempSyslogLevel = mSyslogLevel;

  if ( options.mTerminalLevel != NOOPT )
    tempTerminalLevel = options.mTerminalLevel;

  if ( options.mDatabaseLevel != NOOPT )
    tempDatabaseLevel = options.mDatabaseLevel;
  else
    tempDatabaseLevel = config.log_level_database >= DEBUG1 ? DEBUG9 : config.log_level_database;

  if ( options.mFileLevel != NOOPT )
    tempFileLevel = options.mFileLevel;
  else
    tempFileLevel = config.log_level_file >= DEBUG1 ? DEBUG9 : config.log_level_file;

  if ( options.mSyslogLevel != NOOPT )
    tempSyslogLevel = options.mSyslogLevel;
  else
    tempSyslogLevel = config.log_level_syslog >= DEBUG1 ? DEBUG9 : config.log_level_syslog;

  // Legacy
  if ( (envPtr = getenv( "LOG_PRINT" )) )
    tempTerminalLevel = atoi(envPtr) ? DEBUG9 : NOLOG;

  if ( (envPtr = getTargettedEnv("LOG_LEVEL")) )
    tempLevel = atoi(envPtr);

  if ( (envPtr = getTargettedEnv("LOG_LEVEL_TERM")) )
    tempTerminalLevel = atoi(envPtr);
  if ( (envPtr = getTargettedEnv("LOG_LEVEL_DATABASE")) )
    tempDatabaseLevel = atoi(envPtr);
  if ( (envPtr = getTargettedEnv("LOG_LEVEL_FILE")) )
    tempFileLevel = atoi(envPtr);
  if ( (envPtr = getTargettedEnv("LOG_LEVEL_SYSLOG")) )
    tempSyslogLevel = atoi(envPtr);

  if ( config.log_debug ) {
    StringVector targets = split(config.log_debug_target, "|");
    for ( unsigned int i = 0; i < targets.size(); i++ ) {
      const std::string &target = targets[i];
      if ( target == mId || target == "_"+mId || target == "_"+mIdRoot || target == "" ) {
        if ( config.log_debug_level > NOLOG ) {
          tempLevel = config.log_debug_level;
          if ( config.log_debug_file[0] ) {
            tempLogFile = config.log_debug_file;
            tempFileLevel = tempLevel;
          }
        }
      }
    } // end foreach target
  } else {
    // if we don't have debug turned on, then the max effective log level is INFO
    if ( tempSyslogLevel > INFO ) tempSyslogLevel = INFO;
    if ( tempFileLevel > INFO ) tempFileLevel = INFO;
    if ( tempTerminalLevel > INFO ) tempTerminalLevel = INFO;
    if ( tempDatabaseLevel > INFO ) tempDatabaseLevel = INFO;
    if ( tempLevel > INFO ) tempLevel = INFO;
  } // end if config.log_debug

  logFile(tempLogFile);

  terminalLevel(tempTerminalLevel);
  databaseLevel(tempDatabaseLevel);
  fileLevel(tempFileLevel);
  syslogLevel(tempSyslogLevel);

  level(tempLevel);

  mFlush = false;
  if ( (envPtr = getenv("LOG_FLUSH")) ) {
    mFlush = atoi( envPtr );
  } else if ( config.log_debug ) {
    mFlush = true;
  }

  {
    struct sigaction action;
    memset(&action, 0, sizeof(action));
    action.sa_handler = usrHandler;
    action.sa_flags = SA_RESTART;

    // Does this REALLY need to be fatal?
    if ( sigaction(SIGUSR1, &action, 0) < 0 ) {
      Fatal("sigaction(), error = %s", strerror(errno));
    }
    if ( sigaction(SIGUSR2, &action, 0) < 0) {
      Fatal("sigaction(), error = %s", strerror(errno));
    }
  }

  mInitialised = true;

  Debug(1, "LogOpts: level=%s/%s, screen=%s, database=%s, logfile=%s->%s, syslog=%s",
      smCodes[mLevel].c_str(),
      smCodes[mEffectiveLevel].c_str(),
      smCodes[mTerminalLevel].c_str(),
      smCodes[mDatabaseLevel].c_str(),
      smCodes[mFileLevel].c_str(),
      mLogFile.c_str(),
      smCodes[mSyslogLevel].c_str()
      );
}

void Logger::terminate() {
  Debug(1, "Terminating Logger");

  if ( mFileLevel > NOLOG )
    closeFile();

  if ( mSyslogLevel > NOLOG )
    closeSyslog();

  if ( mDatabaseLevel > NOLOG )
    closeDatabase();
}

// These don't belong here, they have nothing to do with logging
bool Logger::boolEnv(const std::string &name, bool defaultValue) {
  const char *envPtr = getenv(name.c_str());
  return envPtr ? atoi(envPtr) : defaultValue;
}

int Logger::intEnv(const std::string &name, bool defaultValue) {
  const char *envPtr = getenv(name.c_str());
  return envPtr ? atoi(envPtr) : defaultValue;
}

std::string Logger::strEnv(const std::string &name, const std::string &defaultValue) {
  const char *envPtr = getenv(name.c_str());
  return envPtr ? envPtr : defaultValue;
}

char *Logger::getTargettedEnv(const std::string &name) {
  std::string envName;

  envName = name+"_"+mId;
  char *envPtr = getenv(envName.c_str());
  if ( !envPtr && mId != mIdRoot ) {
    envName = name+"_"+mIdRoot;
    envPtr = getenv(envName.c_str());
  }
  if ( !envPtr )
    envPtr = getenv(name.c_str());
  return envPtr;
}

const std::string &Logger::id(const std::string &id) {
  std::string tempId = id;

  size_t pos;
  // Remove whitespace
  while ( (pos = tempId.find_first_of( " \t" )) != std::string::npos ) {
    tempId.replace(pos, 1, "");
  }
  // Replace non-alphanum with underscore
  while ( (pos = tempId.find_first_not_of("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_")) != std::string::npos ) {
    tempId.replace(pos, 1, "_");
  }
  if ( mId != tempId ) {
    mId = tempId;
    pos = mId.find('_');
    if ( pos != std::string::npos ) {
      mIdRoot = mId.substr(0, pos);
      if ( ++pos < mId.size() )
        mIdArgs = mId.substr(pos);
    }
  }
  return mId;
}

Logger::Level Logger::level(Logger::Level level) {
  if ( level > NOOPT ) {
    level = limit(level);
    if ( mLevel != level )
      mLevel = level;

    mEffectiveLevel = NOLOG;
    if ( mTerminalLevel > mEffectiveLevel )
      mEffectiveLevel = mTerminalLevel;
    if ( mDatabaseLevel > mEffectiveLevel )
      mEffectiveLevel = mDatabaseLevel;
    if ( mFileLevel > mEffectiveLevel )
      mEffectiveLevel = mFileLevel;
    if ( mSyslogLevel > mEffectiveLevel )
      mEffectiveLevel = mSyslogLevel;
    if ( mEffectiveLevel > mLevel)
      mEffectiveLevel = mLevel;
  }
  return mLevel;
}

Logger::Level Logger::terminalLevel( Logger::Level terminalLevel ) {
  if ( terminalLevel > NOOPT ) {
    if ( !mHasTerminal )
      terminalLevel = NOLOG;
    terminalLevel = limit(terminalLevel);
    if ( mTerminalLevel != terminalLevel )
      mTerminalLevel = terminalLevel;
  }
  return mTerminalLevel;
}

Logger::Level Logger::databaseLevel( Logger::Level databaseLevel ) {
  if ( databaseLevel > NOOPT ) {
    databaseLevel = limit(databaseLevel);
    if ( mDatabaseLevel != databaseLevel ) {
      if ( databaseLevel > NOLOG && mDatabaseLevel <= NOLOG ) {
        zmDbConnect();
      } // end if ( databaseLevel > NOLOG && mDatabaseLevel <= NOLOG )
      mDatabaseLevel = databaseLevel;
    } // end if ( mDatabaseLevel != databaseLevel )
  } // end if ( databaseLevel > NOOPT )

  return mDatabaseLevel;
}

Logger::Level Logger::fileLevel( Logger::Level fileLevel ) {
  if ( fileLevel > NOOPT ) {
    fileLevel = limit(fileLevel);
    // Always close, because we may have changed file names
    if ( mFileLevel > NOLOG )
	    closeFile();
    mFileLevel = fileLevel;
    if ( mFileLevel > NOLOG )
	    openFile();
  }
  return mFileLevel;
}

Logger::Level Logger::syslogLevel( Logger::Level syslogLevel ) {
  if ( syslogLevel > NOOPT ) {
    syslogLevel = limit(syslogLevel);
    if ( mSyslogLevel != syslogLevel ) {
      if ( mSyslogLevel > NOLOG )
        closeSyslog();
      mSyslogLevel = syslogLevel;
      if ( mSyslogLevel > NOLOG )
        openSyslog();
    }
  }
  return mSyslogLevel;
}

void Logger::logFile( const std::string &logFile ) {
  bool addLogPid = false;
  std::string tempLogFile = logFile;
  if ( tempLogFile[tempLogFile.length()-1] == '+' ) {
    tempLogFile.resize(tempLogFile.length()-1);
    addLogPid = true;
  }
  if ( addLogPid )
    mLogFile = stringtf( "%s.%05d", tempLogFile.c_str(), getpid() );
  else
    mLogFile = tempLogFile;
}

void Logger::openFile() {
  if ( mLogFile.size() ) {
   if ( (mLogFileFP = fopen(mLogFile.c_str() ,"a")) == (FILE *)NULL ) {
    mFileLevel = NOLOG;
    Fatal( "fopen() for %s, error = %s", mLogFile.c_str(), strerror(errno) );
   }
  } else {
    puts("Called Logger::openFile() without a filename");
  }
}

void Logger::closeFile() {
  if ( mLogFileFP ) {
    fflush( mLogFileFP );
    if ( fclose( mLogFileFP ) < 0 ) {
      Fatal( "fclose(), error = %s",strerror(errno) );
    }
    mLogFileFP = (FILE *)NULL;
  }
}

void Logger::closeDatabase() {
  
}

void Logger::openSyslog() {
  (void) openlog( mId.c_str(), LOG_PID|LOG_NDELAY, LOG_LOCAL1 );
}

void Logger::closeSyslog() {
  (void) closelog();
}

void Logger::logPrint( bool hex, const char * const filepath, const int line, const int level, const char *fstring, ... ) {
  if ( level > mEffectiveLevel ) 
    return;
  char            timeString[64];
  char            logString[8192];
  va_list         argPtr;
  struct timeval  timeVal;

  char *filecopy = strdup(filepath);
  const char * const file = basename(filecopy);
  const char *classString = smCodes[level].c_str();

  if ( level < PANIC || level > DEBUG9 )
    Panic("Invalid logger level %d", level);

  gettimeofday(&timeVal, NULL);

#if 0
  if ( logRuntime ) {
    static struct timeval logStart;

    subtractTime( &timeVal, &logStart );

    snprintf( timeString, sizeof(timeString), "%ld.%03ld", timeVal.tv_sec, timeVal.tv_usec/1000 );
  } else {
#endif
    char *timePtr = timeString;
    timePtr += strftime(timePtr, sizeof(timeString), "%x %H:%M:%S", localtime(&timeVal.tv_sec));
    snprintf(timePtr, sizeof(timeString)-(timePtr-timeString), ".%06ld", timeVal.tv_usec);
#if 0
  }
#endif

  pid_t tid;
#ifdef __FreeBSD__
  long lwpid;
  thr_self(&lwpid);
  tid = lwpid;

  if (tid < 0 ) // Thread/Process id
#else
#ifdef HAVE_SYSCALL
#ifdef __FreeBSD_kernel__
    if ( (syscall(SYS_thr_self, &tid)) < 0 ) // Thread/Process id

# else
      // SOLARIS doesn't have SYS_gettid; don't assume
#ifdef SYS_gettid
      if ( (tid = syscall(SYS_gettid)) < 0 ) // Thread/Process id
#endif // SYS_gettid
#endif
#endif // HAVE_SYSCALL
#endif
        tid = getpid(); // Process id

  char *logPtr = logString;
  logPtr += snprintf( logPtr, sizeof(logString), "%s %s[%d].%s-%s/%d [", 
      timeString,
      mId.c_str(),
      tid,
      classString,
      file,
      line
      );
  char *syslogStart = logPtr;

  va_start( argPtr, fstring );
  if ( hex ) {
    unsigned char *data = va_arg( argPtr, unsigned char * );
    int len = va_arg( argPtr, int );
    int i;
    logPtr += snprintf( logPtr, sizeof(logString)-(logPtr-logString), "%d:", len );
    for ( i = 0; i < len; i++ ) {
      logPtr += snprintf( logPtr, sizeof(logString)-(logPtr-logString), " %02x", data[i] );
    }
  } else {
    logPtr += vsnprintf( logPtr, sizeof(logString)-(logPtr-logString), fstring, argPtr );
  }
  va_end(argPtr);
  char *syslogEnd = logPtr;
  strncpy( logPtr, "]\n", sizeof(logString)-(logPtr-logString) );   

  if ( level <= mTerminalLevel ) {
    puts( logString );
    fflush( stdout );
  }
  if ( level <= mFileLevel ) {
    if ( mLogFileFP ) {
      fputs( logString, mLogFileFP );
      if ( mFlush )
        fflush( mLogFileFP );
    } else {
      puts("Logging to file, but file not open\n");
    }
  }
  *syslogEnd = '\0';
  if ( level <= mDatabaseLevel ) {
    char sql[ZM_SQL_MED_BUFSIZ];
    char escapedString[(strlen(syslogStart)*2)+1];

    if ( ! db_mutex.trylock() ) {
      mysql_real_escape_string( &dbconn, escapedString, syslogStart, strlen(syslogStart) );

      snprintf( sql, sizeof(sql), "insert into Logs ( TimeKey, Component, ServerId, Pid, Level, Code, Message, File, Line ) values ( %ld.%06ld, '%s', %d, %d, %d, '%s', '%s', '%s', %d )", timeVal.tv_sec, timeVal.tv_usec, mId.c_str(), staticConfig.SERVER_ID, tid, level, classString, escapedString, file, line );
      if ( mysql_query(&dbconn, sql) ) {
        Level tempDatabaseLevel = mDatabaseLevel;
        databaseLevel(NOLOG);
        Error("Can't insert log entry: sql(%s) error(%s)", sql, mysql_error(&dbconn));
        databaseLevel(tempDatabaseLevel);
      }
      db_mutex.unlock();
    } else {
      Level tempDatabaseLevel = mDatabaseLevel;
      databaseLevel(NOLOG);
      Error("Can't insert log entry: sql(%s) error(db is locked)", logString);
      databaseLevel(tempDatabaseLevel);
    }
  }
  if ( level <= mSyslogLevel ) {
    int priority = smSyslogPriorities[level];
    //priority |= LOG_DAEMON;
    syslog( priority, "%s [%s] [%s]", classString, mId.c_str(), syslogStart );
  }

  free(filecopy);
  if ( level <= FATAL ) {
    logTerm();
    zmDbClose();
    if ( level <= PANIC )
      abort();
    exit(-1);
  }
}

void logInit( const char *name, const Logger::Options &options ) {
  if ( !Logger::smInstance )
    Logger::smInstance = new Logger();
  Logger::Options tempOptions = options;
  tempOptions.mLogPath = staticConfig.PATH_LOGS;
  Logger::smInstance->initialise( name, tempOptions );
}

void logTerm() {
  if ( Logger::smInstance ) {
    delete Logger::smInstance;
    Logger::smInstance = NULL;
  }
}