#pragma once

#include <vector>
#include <set>
#include <ostream>

//#ifndef PROFILER_ENABLED
//#define PROFILER_ENABLED
//#endif

#ifdef PROFILER_ENABLED
#define STRINGIZE(x) #x
#define NAMED_	PERFORMANCE_MARKER(x) PerfMarker x(__FILE__, STRINGIZE(x), __LINE__);
#define END_NAMED_	PERFORMANCE_MARKER(x) x.endMark();
#define PERFORMANCE_MARKER PerfMarker MARK(__FILE__, __FUNCTION__, __LINE__);
#define PERIODIC_PROFILING
#else
#define PERFORMANCE_MARKER
#endif
#pragma warning (disable : 4512)//disables assignment operator could not be generated

struct PerfDatum
{
	PerfDatum(	const char* const fileName, 
				const char* const functionName,
				const int lineNumber,
				__int64 cycles = 0,
				__int64 calls = 0);
	const char* const	_fileName;
	const char* const	_functionName;
	const int			_lineNumber;
	__int64			 _cycles;		//Number of CPU cycles used
	__int64			 _calls;		 //Number of calls to this function
};
#pragma warning (default : 4512)//disables assignment operator could not be generated

class PerfSort
{
public:
	bool operator()(const PerfDatum& lhs, const PerfDatum& rhs) const;
};

class PerfSort2
{
public:
	bool operator()(const PerfDatum& lhs, const PerfDatum& rhs) const;
};


typedef std::set<PerfDatum, PerfSort>		PERF_LOG_T;
typedef std::vector<PerfDatum* >			PERF_STACK_T;

class PerfManager
{
public:
	~PerfManager(void);
	static PerfManager* instance();
	void enterFunction( const char* const fileName, 
						const char* const functionName,
						const int lineNumber);
	void exitFunction();
	void log(std::ostream &os);
private:
	PerfManager(void);
	__int64 getCPUCount(void) const;
	void calibrate(void);
	int getPercision(const double value) const; //used for formatting percentages
	static PerfManager* _instance;
	PERF_LOG_T		_perfLog;
	PERF_STACK_T	_perfStack;
	__int64		 _callTime;	//Time it takes to call the getCPUCount function
	__int64		 _totalTime;
	__int64		 _lastTime;	//The last time we got hte CPU count.
};

class PerfMarker
{
public:
	PerfMarker( const char* const fileName, 
				const char* const functionName,
				const int lineNumber);
	~PerfMarker();
	void endMark();
private:
	bool _onStack;
};