#include "Logging.h"

#include <iostream>
#include <cstdarg>
#include <cstdlib>
#include <assert.h>

namespace Engine {

static Logging *LoggingInstance = NULL;
static LogLevel requested_level = LOG_DEFAULT_LEVEL;

/*
 * Inherited Module functions
 */
int Logging::OnInit (int argc, char* argv[]) {
	mPrintLevel = requested_level;

	Log (LogLevelDebug, "Logging Init");
	LoggingInstance = this;

	return 0;
}

void Logging::OnDestroy () {
	Log (LogLevelDebug, "Logging Destroy");

	LoggingInstance = NULL;
}

/*
 * Module specific functions
 */
void Logging::Log (LogLevel level, const char *str, ...) {
	if (level < mPrintLevel)
		return;

	static char msg[LOG_MAX_MESSAGE_LENGTH];
	static int last_length = LOG_MAX_MESSAGE_LENGTH;
	static int i;
	
	for (i = 0; i < last_length; i++)
		msg[i] = 0;

	va_list ap;
	va_start(ap, str);
	vsprintf(msg, str, ap);
	va_end(ap);

	last_length = strlen (msg);
	assert (last_length < LOG_MAX_MESSAGE_LENGTH);

	std::cout << msg << std::endl;

	LogEntry log_entry (level, msg);
	mLogEntries.push_back (log_entry);
}

void Logging::SetLogPrintLevel (LogLevel print_level) {
	mPrintLevel = print_level;
}

const LogEntry &Logging::GetLastEntry () {
	static LogEntry null_message (LogLevelMessage, "");

	if (mLogEntries.size() > 0) {
		return mLogEntries[mLogEntries.size() - 1];
	}

	return null_message;
}

/*
 * Globally visible functions 
 */
void SetLogPrintLevel (LogLevel print_level) {
	if (!LoggingInstance) {
		requested_level = print_level;
		return;
	}

	LoggingInstance->SetLogPrintLevel (print_level);
}

void LogError (const char* str, ...) {
	assert (LoggingInstance);

	static char msg[LOG_MAX_MESSAGE_LENGTH];
	static int last_length = LOG_MAX_MESSAGE_LENGTH;
	static int i;
	
	for (i = 0; i < last_length; i++)
		msg[i] = 0;

	va_list ap;
	va_start(ap, str);
	vsprintf(msg, str, ap);
	va_end(ap);

	last_length = strlen (msg);
	assert (last_length < LOG_MAX_MESSAGE_LENGTH);

	LoggingInstance->Log (LogLevelError, msg);
}

void LogWarning (const char* str, ...) {
	assert (LoggingInstance);

	static char msg[LOG_MAX_MESSAGE_LENGTH];
	static int last_length = LOG_MAX_MESSAGE_LENGTH;
	static int i;
	
	for (i = 0; i < last_length; i++)
		msg[i] = 0;

	va_list ap;
	va_start(ap, str);
	vsprintf(msg, str, ap);
	va_end(ap);

	last_length = strlen (msg);
	assert (last_length < LOG_MAX_MESSAGE_LENGTH);

	LoggingInstance->Log (LogLevelWarning, msg);
}

void LogMessage (const char* str, ...) {
	assert (LoggingInstance);

	static char msg[LOG_MAX_MESSAGE_LENGTH];
	static int last_length = LOG_MAX_MESSAGE_LENGTH;
	static int i;
	
	for (i = 0; i < last_length; i++)
		msg[i] = 0;

	va_list ap;
	va_start(ap, str);
	vsprintf(msg, str, ap);
	va_end(ap);

	last_length = strlen (msg);
	assert (last_length < LOG_MAX_MESSAGE_LENGTH);

	LoggingInstance->Log (LogLevelMessage, msg);
}

void LogDebug (const char* str, ...) {
	assert (LoggingInstance);
	static char msg[LOG_MAX_MESSAGE_LENGTH];
	static int last_length = LOG_MAX_MESSAGE_LENGTH;
	static int i;
	
	for (i = 0; i < last_length; i++)
		msg[i] = 0;

	va_list ap;
	va_start(ap, str);
	vsprintf(msg, str, ap);
	va_end(ap);

	last_length = strlen (msg);
	assert (last_length < LOG_MAX_MESSAGE_LENGTH);

	LoggingInstance->Log (LogLevelDebug, msg);
}

const LogEntry& GetLastLogEntry () {
	assert (LoggingInstance);
	return LoggingInstance->GetLastEntry ();
}

}