/* Global Message Reporter ( source code )
 * By Asha Dixon, 2018 */

#include <stdio.h>
#include <stdarg.h>
#include "log_msg.h"

#define LOG_LEVEL_MIN 0
#define LOG_LEVEL_MAX 4

/* log_prefixes: the prefixes to all the messages. This can
 * be indexed with the log_level enum ( see log_msg.h ) */
char * log_prefixes[] = {
	"Error", "Internal Error", "Warning",
	"Information", "DEBUG"
};

/* log_message: outputs a message to the appropriate buffer with
 * the appropriate prefix. */
void log_message ( enum log_level level, char * fmt, ... ) {
	va_list vaa;
	FILE * buffer = NULL;
	char * prefix = NULL;

#ifndef DEBUG
	if ( level == LOG_LEVEL_DEBUG )
		return;
#endif

	if ( level < LOG_LEVEL_MIN || level > LOG_LEVEL_MAX )
		return;

	// select buffer and prefix

	switch ( level ) {
		case LOG_LEVEL_ERROR:
		case LOG_LEVEL_INTERNAL:
			buffer = stderr;
			break;
		default:
			buffer = stdout;
	}

	prefix = log_prefixes[level];

	// output the message

	va_start ( vaa, fmt );

	fprintf ( buffer, "%s: ", prefix );
	vfprintf ( buffer, fmt, vaa );
	fprintf ( buffer, "\n" );

	va_end ( vaa );
}