/******************************************************************************
 *
 *                Copyright (c) 2017-2019 by Löwenware Ltd
 *             Please, refer LICENSE file for legal information
 *
 ******************************************************************************/

/**
 * @file log.c
 * @author Ilja Kartašov <ik@lowenware.com>
 * @brief cStuff log module source file
 *
 * @see https://lowenware.com/
 */
#include <time.h>
#include "log.h"


void
cstuff_log_init(CStuffLog self, uint8_t level)
{
	self->target = stderr;
	self->level = level;
}


void
cstuff_log_release(CStuffLog self)
{
	if (self->target != stderr)
		fclose(self->target);
}


CStuffRetcode
cstuff_log_set_file(CStuffLog self, const char *filename)
{
	FILE *fp;

	if (!(fp = fopen(filename, "a")))
		return CSTUFF_SYSCALL_ERROR;

	self->target = fp;
	return CSTUFF_SUCCESS;
}


int
cstuff_log_printf(CStuffLog self, int level, const char *format, ...)
{
	int result;
	va_list vl;

	va_start(vl, format);
	result = cstuff_log_vprintf(self, level, format, vl);
	va_end(vl);

	return result;
}


int
cstuff_log_vprintf(CStuffLog self, int level, const char *format, va_list vl)
{
	int result;

	if (self->level & level) {
		FILE *f = self->target;
		char *label;
		time_t rawtime;
		char strtime[32+1];
		struct tm timeinfo;

		time(&rawtime);
		localtime_r(&rawtime, &timeinfo);
		strftime(strtime, 32, "%F %T", &timeinfo);

		switch (level)
		{
		case CSTUFF_LOG_ERROR:
			label = "!!";
			break;
		case CSTUFF_LOG_ALERT:
			label = "~!";
			break;
		case CSTUFF_LOG_DEBUG:
			label = "**";
			break;
		default:
			label = "--";
		}

		result = fprintf(f, "%s %s ", strtime, label);
		result += vfprintf(f, format, vl);
		fputc('\n', f);
		result++;
		fflush(f);
	} else {
		result = 0;
	}

	return result;
}