/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 */

#ifndef GUI_DEBUGGER_H
#define GUI_DEBUGGER_H

#include "common/func.h"
#include "common/ptr.h"
#include "common/hashmap.h"
#include "common/hash-str.h"

namespace GUI {

#ifndef USE_TEXT_CONSOLE
class ConsoleDialog;
#endif

class Debugger {
public:
	Debugger();
	virtual ~Debugger();

	int DebugPrintf(const char *format, ...);

	virtual void onFrame();

	virtual void attach(const char *entry = 0);
	bool isAttached() const { return _isAttached; }

protected:
	typedef Common::Functor2<int, const char **, bool> Debuglet;

	// Convenience macro for registering a method of a debugger class
	// as the current command.
	#define WRAP_METHOD(cls, method) \
		new Common::Functor2Mem<int, const char **, bool, cls>(this, &cls::method)

	enum {
		DVAR_BYTE,
		DVAR_INT,
		DVAR_BOOL,
		DVAR_INTARRAY,
		DVAR_STRING
	};

	struct DVar {
		Common::String name;
		void *variable;
		int type;
		int optional;
	};

	int _frame_countdown;
	bool _detach_now;

private:
	Common::Array<DVar> _dvars;

	typedef Common::HashMap<Common::String, Common::SharedPtr<Debuglet>, Common::IgnoreCase_Hash, Common::IgnoreCase_EqualTo> CommandsMap;
	CommandsMap _cmds;

	bool _isAttached;
	char *_errStr;
	bool _firstTime;
#ifndef USE_TEXT_CONSOLE
	GUI::ConsoleDialog *_debuggerDialog;
#endif

protected:
	// Hook for subclasses: Called just before enter() is run
	virtual void preEnter() {}

	// Hook for subclasses: Called just after enter() was run
	virtual void postEnter() {}

	// Hook for subclasses: Process the given command line.
	// Should return true if and only if argv[0] is a known command and was
	// handled, false otherwise.
	virtual bool handleCommand(int argc, const char **argv, bool &keepRunning);


private:
	void detach();
	void enter();

	bool parseCommand(const char *input);
	bool tabComplete(const char *input, Common::String &completion) const;

protected:
	void DVar_Register(const Common::String &varname, void *pointer, int type, int optional);
	void DCmd_Register(const Common::String &cmdname, Debuglet *debuglet);

	bool Cmd_Exit(int argc, const char **argv);
	bool Cmd_Help(int argc, const char **argv);
	bool Cmd_DebugFlagsList(int argc, const char **argv);
	bool Cmd_DebugFlagEnable(int argc, const char **argv);
	bool Cmd_DebugFlagDisable(int argc, const char **argv);

#ifndef USE_TEXT_CONSOLE
private:
	static bool debuggerInputCallback(GUI::ConsoleDialog *console, const char *input, void *refCon);
	static bool debuggerCompletionCallback(GUI::ConsoleDialog *console, const char *input, Common::String &completion, void *refCon);
#elif defined(USE_READLINE)
public:
	char *readlineComplete(const char *input, int state);
#endif

};

}	// End of namespace GUI

#endif