/*

 * Hedgewars, a free turn based strategy game

 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>

 *

 * 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 "logging.h"

#include <time.h>

#include <stdio.h>

#include <stdarg.h>

#include <stdlib.h>

static int flib_loglevel = FLIB_LOGLEVEL_INFO;

static FILE *flib_logfile = NULL;

void (*flib_logCallback)(int level, const char *msg) = NULL;

char* flib_format_ip(uint32_t numip) {

    static char ip[16];

    snprintf(ip, 16, "%u.%u.%u.%u", (unsigned)(numip>>24), (unsigned)((numip>>16)&0xff), (unsigned)((numip>>8)&0xff), (unsigned)(numip&0xff));

    return ip;

}

static inline FILE *flib_log_getfile() {

    if(flib_logfile==NULL) {

        return stdout;

    } else {

        return flib_logfile;

    }

}

static int log_time(char *buffer) {

    time_t timer;

    struct tm* tm_info;

    time(&timer);

    tm_info = localtime(&timer);

    return strftime(buffer, 25, "%Y-%m-%d %H:%M:%S", tm_info);

}

static char getPrefix(int level) {

    switch(level) {

    case FLIB_LOGLEVEL_ERROR: return 'E';

    case FLIB_LOGLEVEL_WARNING: return 'W';

    case FLIB_LOGLEVEL_INFO: return 'I';

    case FLIB_LOGLEVEL_DEBUG: return 'D';

    default: return '?';

    }

}

static void _flib_vflog(const char *func, int level, const char *fmt, va_list args) {

    if(level >= flib_loglevel) {

        char logbuffer[1024];

        logbuffer[0] = getPrefix(level);

        logbuffer[1] = ' ';

        int pos = 2;

        int len = log_time(logbuffer+pos);

        if(len>=0) {

            pos += len;

            if(pos>sizeof(logbuffer)-1) pos = sizeof(logbuffer)-1;

        } else {

            return;

        }

        len = snprintf(logbuffer+pos, sizeof(logbuffer)-pos, " [%-30s] ", func);

        if(len>=0) {

            pos += len;

            if(pos>sizeof(logbuffer)-1) pos = sizeof(logbuffer)-1;

        } else {

            return;

        }

        len = vsnprintf(logbuffer+pos, sizeof(logbuffer)-pos, fmt, args);

        if(len>=0) {

            pos += len;

            if(pos>sizeof(logbuffer)-1) pos = sizeof(logbuffer)-1;

        } else {

            return;

        }

        if(flib_logCallback != NULL) {

            flib_logCallback(level, logbuffer);

        } else {

            FILE *logfile = flib_log_getfile();

            fputs(logbuffer, logfile);

            fputc('\n', logfile);

            fflush(logfile);

        }

    }

}

void _flib_flog(const char *func, int level, const char *fmt, ...) {

    va_list argp;

    va_start(argp, fmt);

    _flib_vflog(func, level, fmt, argp);

    va_end(argp);

}

bool _flib_fassert(const char *func, int level, bool cond, const char *fmt, ...) {

    if(!cond) {

        va_list argp;

        va_start(argp, fmt);

        _flib_vflog(func, level, fmt, argp);

        va_end(argp);

    }

    return !cond;

}

int flib_log_getLevel() {

    return flib_loglevel;

}

void flib_log_setLevel(int level) {

    flib_loglevel = level;

}

void flib_log_setFile(FILE *file) {

    flib_logfile = file;

    flib_logCallback = NULL;

}

bool flib_log_isActive(int level) {

    return level >= flib_log_getLevel();

}

void flib_log_setCallback(void (*logCallback)(int level, const char *msg)) {

    flib_logCallback = logCallback;

    flib_logfile = NULL;

}