/* Copyright (C) 2014-2016 Ben Kurtovic <ben.kurtovic@gmail.com>
   Released under the terms of the MIT License. See LICENSE for details. */

#pragma once

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* Internal usage only */

#define LOG_MSG_(dest, level, type, extra, after, ...) \
    do {                                               \
        if (!level || logging_level_ >= level) {       \
            fprintf(dest, type " " __VA_ARGS__);       \
            extra                                      \
            fprintf(dest, "\n");                       \
            after                                      \
        }                                              \
    } while (0);

#define LOG_ERR_(...) LOG_MSG_(stderr, __VA_ARGS__)
#define LOG_OUT_(...) LOG_MSG_(stdout, __VA_ARGS__)

#define PRINT_ERR_ fprintf(stderr, ": %s", strerror(errno));
#define EXIT_FAIL_ exit(EXIT_FAILURE);
#define NO_EOL_    if (0)
#define FLUSH_OUT_ fflush(stdout);

#define FATAL_TEXT_ "\x1b[1m\x1b[31m" "fatal:"   "\x1b[0m"
#define ERROR_TEXT_ "\x1b[1m\x1b[31m" "error:"   "\x1b[0m"
#define  WARN_TEXT_ "\x1b[1m\x1b[33m" "warning:" "\x1b[0m"
#define DEBUG_TEXT_ "\x1b[0m\x1b[37m" "[DEBUG]"  "\x1b[0m"
#define TRACE_TEXT_ "\x1b[1m\x1b[30m" "[TRACE]"  "\x1b[0m"

unsigned logging_level_;

/* Public logging macros */

#define FATAL(...)       LOG_ERR_(0, FATAL_TEXT_, {},         EXIT_FAIL_, __VA_ARGS__)
#define FATAL_ERRNO(...) LOG_ERR_(0, FATAL_TEXT_, PRINT_ERR_, EXIT_FAIL_, __VA_ARGS__)
#define ERROR(...)       LOG_ERR_(0, ERROR_TEXT_, {},         {},         __VA_ARGS__)
#define ERROR_ERRNO(...) LOG_ERR_(0, ERROR_TEXT_, PRINT_ERR_, {},         __VA_ARGS__)
#define WARN(...)        LOG_ERR_(0,  WARN_TEXT_, {},         {},         __VA_ARGS__)
#define WARN_ERRNO(...)  LOG_ERR_(0,  WARN_TEXT_, PRINT_ERR_, {},         __VA_ARGS__)
#define DEBUG(...)       LOG_OUT_(1, DEBUG_TEXT_, {},         {},         __VA_ARGS__)
#define TRACE(...)       LOG_OUT_(2, TRACE_TEXT_, {},         {},         __VA_ARGS__)
#define TRACE_NOEOL(...) LOG_OUT_(2, TRACE_TEXT_, NO_EOL_,    FLUSH_OUT_, __VA_ARGS__)

#define SET_LOG_LEVEL(level) logging_level_ = (level);
#define DEBUG_LEVEL (logging_level_ >= 1)
#define TRACE_LEVEL (logging_level_ >= 2)