// See the file "COPYING" in the main distribution directory for copyright.

#ifndef REPORTER_H
#define REPORTER_H

#include <stdarg.h>

#include <list>
#include <utility>

#include "util.h"
#include "net_util.h"
#include "EventHandler.h"

class Connection;
class Location;
class Reporter;

// One cannot raise this exception directly, go through the
// Reporter's methods instead.

class ReporterException {
protected:
	friend class Reporter;
	ReporterException()	{}
};

class InterpreterException : public ReporterException {
protected:
	friend class Reporter;
	InterpreterException()	{}
};

// Check printf-style variadic arguments if we can.
#if __GNUC__
#define FMT_ATTR __attribute__((format(printf, 2, 3))) // sic! 1st is "this" I guess.
#else
#define FMT_ATTR
#endif

class Reporter {
public:
	Reporter();
	~Reporter();

	// Report an informational message, nothing that needs specific
	// attention.
	void Info(const char* fmt, ...) FMT_ATTR;

	// Report a warning that may indicate a problem.
	void Warning(const char* fmt, ...) FMT_ATTR;

	// Report a non-fatal error. Processing proceeds normally after the error
	// has been reported.
	void Error(const char* fmt, ...) FMT_ATTR;

	// Returns the number of errors reported so far.
	int Errors()	{ return errors; }

	// Report a fatal error. Bro will terminate after the message has been
	// reported.
	void FatalError(const char* fmt, ...) FMT_ATTR;

	// Report a fatal error. Bro will terminate after the message has been
	// reported and always generate a core dump.
	void FatalErrorWithCore(const char* fmt, ...) FMT_ATTR;

	// Report a runtime error in evaluating a Bro script expression. This
	// function will not return but raise an InterpreterException.
	void ExprRuntimeError(const Expr* expr, const char* fmt, ...);

	// Report a traffic weirdness, i.e., an unexpected protocol situation
	// that may lead to incorrectly processing a connnection.
	void Weird(const char* name);	// Raises net_weird().
	void Weird(Connection* conn, const char* name, const char* addl = "");	// Raises conn_weird().
	void Weird(Val* conn_val, const char* name, const char* addl = "");	// Raises conn_weird().
	void Weird(const uint32* orig, const uint32* resp, const char* name);	// Raises flow_weird().

	// Syslog a message. This methods does nothing if we're running
	// offline from a trace.
	void Syslog(const char* fmt, ...) FMT_ATTR;

	// Report about a potential internal problem. Bro will continue
	// normally.
	void InternalWarning(const char* fmt, ...) FMT_ATTR;

	// Report an internal program error. Bro will terminate with a core
	// dump after the message has been reported.
	void InternalError(const char* fmt, ...) FMT_ATTR;

	// Toggle whether non-fatal messages should be reported through the
	// scripting layer rather on standard output. Fatal errors are always
	// reported via stderr.
	void ReportViaEvents(bool arg_via_events)	 { via_events = arg_via_events; }

	// Associates the given location with subsequent output. We create a
	// stack of location so that the most recent is always the one that
	// will be assumed to be the current one. The pointer must remain
	// valid until the location is popped.
	void PushLocation(const Location* location)
		{ locations.push_back(std::pair<const Location*, const Location*>(location, 0)); }

	void PushLocation(const Location* loc1, const Location* loc2)
		{ locations.push_back(std::pair<const Location*, const Location*>(loc1, loc2)); }

	// Removes the top-most location information from stack.
	void PopLocation()
		{ locations.pop_back(); }

	// Signals that we're entering processing an error handler event.
	void BeginErrorHandler()	{ ++in_error_handler; }

	// Signals that we're done processing an error handler event.
	void EndErrorHandler()	{ --in_error_handler; }

private:
	void DoLog(const char* prefix, EventHandlerPtr event, FILE* out,
		   Connection* conn, val_list* addl, bool location, bool time,
		   const char* postfix, const char* fmt, va_list ap);

	// The order if addl, name needs to be like that since fmt_name can
	// contain format specifiers
	void WeirdHelper(EventHandlerPtr event, Val* conn_val, const char* addl, const char* fmt_name, ...);
	void WeirdFlowHelper(const uint32* orig, const uint32* resp, const char* fmt_name, ...);

	int errors;
	bool via_events;
	int in_error_handler;

	std::list<std::pair<const Location*, const Location*> > locations;
};

extern Reporter* reporter;

#endif