/*!
 * @file shell_command.h
 * Definition of a on-screen-shell
 */

#ifndef _SHELL_COMMAND_H
#define _SHELL_COMMAND_H

#include "base_object.h"

#include "helper_functions.h"
#include "multi_type.h"
#include "substring.h"
#include "functor_list.h"

#include <stdarg.h>

#define     SHELL_COMMAND_MAX_SIZE      //!< The maximum size of a Shell Command



// FORWARD DECLARATION
template<class T> class tList;

/**
 * an easy to use Macro to create a Command
 * @param command the name of the command (without "" around the string)
 * @param class the name of the class to apply this command to (without the "" around the string)
 * @param function the function to call
 *
 * MEANING:
 *  ShellCommandBase* someUniqueVarName =
 *       ShellCommand<ClassName>::registerCommand("commandNameInShell", "ClassName", &ClassName::FunctionToCall);
 *
 * In the Shell you would call this Command using:
 * $ ClassName [ObjectName] commandNameInShell [parameters]
 */
#define SHELL_COMMAND(command, class, function) \
        ShellCommandBase* shell_command_##class##_##command = ShellCommand<class>::registerCommand(#command, #class, &class::function)
/**
 * an easy to use Macro to create a Command
 * @param command the name of the command (without "" around the string)
 * @param class the name of the class to apply this command to (without the "" around the string)
 * @param function the function to call
 *
 * MEANING:
 *  ShellCommandBase* someUniqueVarName =
 *       ShellCommand<ClassName>::registerCommand("commandNameInShell", "ClassName", &ClassName::FunctionToCall);
 *
 * In the Shell you would call this Command using:
 * $ ClassName [ObjectName] commandNameInShell [parameters]
 */
#define SHELL_COMMAND_STATIC(command, class, function) \
                         ShellCommandBase* shell_command_##class##_##command = ShellCommandStatic<class>::registerCommand(#command, #class, function)


//! an enumerator for the definition of the Type.
typedef enum {
  ShellCommand_Objective = 1,
  ShellCommand_Static    = 2,
} ShellCommand_Type;

////////////////
// BASE CLASS //
////////////////
class ShellCommandBase;
class ShellCommandAlias;

//! A class to hold all Classes that have (once) registered Commands.
class ShellCommandClass : public BaseObject
{
  friend class ShellCommandBase;

  public:
    /** @returns the CommandClassList */
    static const tList<ShellCommandClass>* getCommandClassList() { return ShellCommandClass::commandClassList; };
    static bool getCommandListOfClass(const char* className, tList<const char>* stringList);
    static bool getCommandListOfAlias(tList<const char>* aliasList);

    static ShellCommandClass* getCommandClass(const char* className);
    static void unregisterAllCommands();

    static void help (const char* className);

  private:
    ShellCommandClass(const char* className);
    ~ShellCommandClass();

    static const ShellCommandClass* isRegistered(const char* className);
    static void initCommandClassList();

  private:
    const char*                      className;                 //!< The Name of the Class. This should match the ClassName of the Commands Class.
    long                             classID;                   //!< The classID of this Class
    tList<ShellCommandBase>*         commandList;               //!< A list of Commands from this Class
    static tList<ShellCommandClass>* commandClassList;          //!< A list of Classes
    static tList<ShellCommandAlias>* aliasList;                 //!< An Alias to A Command. (only for classes with one Instance)
};


//! a baseClass for all possible ShellCommands
class ShellCommandBase : public BaseObject
{
  friend class ShellCommandClass;
  public:
    static bool execute (const char* executionString);

    ShellCommandBase* describe(const char* description);
    ShellCommandBase* setAlias(const char* alias);
    ShellCommandBase* defaultValues(unsigned int count, ...);

    /** @returns the CommandList of the Shell */
    static void unregisterCommand(const char* commandName, const char* className);

    static void debug();

  protected:
    ShellCommandBase(const char* commandName, const char* className, unsigned int paramCount, ...);
    ~ShellCommandBase();

    /** @returns the Type of this Function (either static or objective) */
    inline ShellCommand_Type getType() { return this->functorType; };

    static bool isRegistered(const char* commandName, const char* className, unsigned int paramCount, ...);
    static const char* paramToString(long parameter);

  private:
    /** executes a Command @param object the object to apply this to @param parameters the parameters the command takes */
    virtual void executeCommand (BaseObject* object, const char* parameters) = 0;

  protected:
    ShellCommand_Type                functorType;                          //!< The type of Function we've got (either static or objective).
    void*                            functionPointer;                      //!< The pointeer to the function of the Class (or static pointer if ClassID == CL_NULL )
    unsigned int                     paramCount;                           //!< the count of parameters.
    unsigned int*                    parameters;                           //!< Parameters the function of this Command takes.
    MultiType*                       defaultValue;                         //!< Default Values.

  private:
    ShellCommandClass*               shellClass;                           //!< A Pointer to the Shell-Class this Command belongs to.
    ShellCommandAlias*               alias;                                //!< An Alias for the Class.

    const char*                      description;                          //!< A description for this commnand. (initially NULL). Assigned with (create)->describe("blablabla");
};

///////////////////////////////////////////////////
///////////////////////////////////////////////////

/////////////////////////////////
// MACRO DEFINITION EXTENSIONS //
/////////////////////////////////
//! where to chek for default BOOL values
#define   l_BOOL_DEFGRAB(i)         this->defaultValue[i].getBool()
//! where to chek for default INT values
#define   l_INT_DEFGRAB(i)          this->defaultValue[i].getInt()
//! where to chek for default UINT values
#define   l_UINT_DEFGRAB(i)         (unsigned int)this->defaultValue[i].getInt()
//! where to chek for default LONG values
#define   l_LONG_DEFGRAB(i)         (long)this->defaultValue[i].getInt()
//! where to chek for default FLOAT values
#define   l_FLOAT_DEFGRAB(i)        this->defaultValue[i].getFloat()
//! where to chek for default STRING values
#define   l_STRING_DEFGRAB(i)       this->defaultValue[i].getString()

//////////////////////////
// COMMAND REGISTRATION //
//////////////////////////
// SHELLCOMMAND can be redefined as ShellCommand or ShellCommandStatic
// SHELLCOMMANDEXECUTER can be redefined too.
// SHELLCOMMANDINCLASS
// SHELLCOMMANDTYPE
//! registers a command without any parameters
#define ShellCommandRegister0() \
  static SHELLCOMMAND<T>* registerCommand(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)()) \
  { \
    if (isRegistered(commandName, className, 0)== true) \
      return NULL; \
    return new SHELLCOMMAND<T>(commandName, className, function); \
  }

//! registers a command with 1 parameter
#define ShellCommandRegister1(t1) \
  static SHELLCOMMAND<T>* registerCommand(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)(t1##_TYPE)) \
  { \
    if (isRegistered(commandName, className, 1, t1##_PARAM)== true) \
      return NULL; \
    return new SHELLCOMMAND<T>(commandName, className, function); \
  }

//! registers a command with 2 parameters
#define ShellCommandRegister2(t1,t2) \
  static SHELLCOMMAND<T>* registerCommand(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)(t1##_TYPE, t2##_TYPE)) \
  { \
    if (isRegistered(commandName, className, 2, t1##_PARAM, t2##_PARAM)== true) \
      return NULL; \
    return new SHELLCOMMAND<T>(commandName, className, function); \
  }

//! registers a command with 3 parameters
#define ShellCommandRegister3(t1,t2,t3) \
  static SHELLCOMMAND<T>* registerCommand(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)(t1##_TYPE, t2##_TYPE, t3##_TYPE)) \
  { \
    if (isRegistered(commandName, className, 3, t1##_PARAM, t2##_PARAM, t3##_PARAM)== true) \
      return NULL; \
    return new SHELLCOMMAND<T>(commandName, className, function); \
  }

//! registers a command with 4 parameters
#define ShellCommandRegister4(t1,t2,t3,t4) \
  static SHELLCOMMAND<T>* registerCommand(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)(t1##_TYPE, t2##_TYPE, t3##_TYPE, t4##_TYPE)) \
  { \
    if (isRegistered(commandName, className, 4, t1##_PARAM, t2##_PARAM, t3##_PARAM, t4##_PARAM)== true) \
      return NULL; \
    return new SHELLCOMMAND<T>(commandName, className, function); \
  }

//! registers a command with 5 parameters
#define ShellCommandRegister5(t1,t2,t3,t4,t5) \
  static SHELLCOMMAND<T>* registerCommand(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)(t1##_TYPE, t2##_TYPE, t3##_TYPE, t4##_TYPE, t5##_TYPE)) \
  { \
    if (isRegistered(commandName, className, 5, t1##_PARAM, t2##_PARAM, t3##_PARAM, t4##_PARAM, t5##_PARAM)== true) \
      return NULL; \
    return new ShellCommand<T>(commandName, className, function); \
  }

///////////////////////
// FUNCTION POINTERS //
///////////////////////
#define ShellCommandFunctionPoiter0() \
  void SHELLCOMMANDINCLASS(*functionPointer_0)();

#define ShellCommandFunctionPoiter1(t1) \
  void SHELLCOMMANDINCLASS(*functionPointer_1_##t1)(t1##_TYPE);

#define ShellCommandFunctionPoiter2(t1, t2) \
  void SHELLCOMMANDINCLASS(*functionPointer_2_##t1##_##t2)(t1##_TYPE, t2##_TYPE);


#define ShellCommandFunctionPoiter3(t1, t2, t3) \
  void SHELLCOMMANDINCLASS(*functionPointer_3_##t1##_##t2##_##t3)(t1##_TYPE, t2##_TYPE, t3##_TYPE);

#define ShellCommandFunctionPoiter4(t1, t2, t3, t4) \
  void SHELLCOMMANDINCLASS(*functionPointer_4_##t1##_##t2##_##t3##_##t4)(t1##_TYPE, t2##_TYPE, t3##_TYPE, t4##_TYPE);


#define ShellCommandFunctionPoiter5(t1, t2, t3, t4, t5) \
  void SHELLCOMMANDINCLASS(*functionPointer_5_##t1##_##t2##_##t3##_##t4##_##t5)(t1##_TYPE, t2##_TYPE, t3##_TYPE, t4##_TYPE, t5##_TYPE); \


//////////////////
// CONSTRUCTORS //
/////////////////
//! creates a command that takes no parameters
#define ShellCommandConstructor0() \
  SHELLCOMMAND(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)()) \
  : ShellCommandBase(commandName, className, 0) \
  { \
    this->functorType = SHELLCOMMANDTYPE; \
    this->fp.functionPointer_0 = function; \
  }

//! creates a command that takes one parameter
#define ShellCommandConstructor1(t1) \
  SHELLCOMMAND(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)(t1##_TYPE)) \
  : ShellCommandBase(commandName, className, 1, t1##_PARAM) \
  { \
    this->functorType = SHELLCOMMANDTYPE; \
    this->fp.functionPointer_1_##t1 = function; \
  }

//! creates a command that takes two parameters
#define ShellCommandConstructor2(t1,t2) \
  SHELLCOMMAND(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)(t1##_TYPE, t2##_TYPE)) \
  : ShellCommandBase(commandName, className, 2, t1##_PARAM, t2##_PARAM) \
  { \
    this->functorType = SHELLCOMMANDTYPE; \
    this->fp.functionPointer_2_##t1##_##t2 = function; \
  }

//! creates a command that takes three parameter
#define ShellCommandConstructor3(t1,t2,t3) \
  SHELLCOMMAND(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)(t1##_TYPE, t2##_TYPE, t3##_TYPE)) \
  : ShellCommandBase(commandName, className, 3, t1##_PARAM, t2##_PARAM, t3##_PARAM) \
  { \
    this->functorType = SHELLCOMMANDTYPE; \
    this->fp.functionPointer_3_##t1##_##t2##_##t3 = function; \
  }

//! creates a command that takes four parameter
#define ShellCommandConstructor4(t1,t2,t3,t4) \
  SHELLCOMMAND(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)(t1##_TYPE, t2##_TYPE, t3##_TYPE, t4##_TYPE)) \
  : ShellCommandBase(commandName, className, 4, t1##_PARAM, t2##_PARAM, t3##_PARAM, t4##_PARAM) \
  { \
    this->functorType = SHELLCOMMANDTYPE; \
    this->fp.functionPointer_4_##t1##_##t2##_##t3##_##t4 = function; \
  }

//! creates a command that takes five parameter
#define ShellCommandConstructor5(t1,t2,t3,t4,t5) \
  SHELLCOMMAND(const char* commandName, const char* className, void SHELLCOMMANDINCLASS(*function)(t1##_TYPE, t2##_TYPE, t3##_TYPE, t4##_TYPE, t5##_TYPE)) \
  : ShellCommandBase(commandName, className, 5, t1##_PARAM, t2##_PARAM, t3##_PARAM, t4##_PARAM, t5##_PARAM) \
  { \
    this->functorType = SHELLCOMMANDTYPE; \
    this->fp.functionPointer_5_##t1##_##t2##_##t3##_##t4##_##t5 = function; \
  }

///////////////
// EXECUTION //
///////////////
//! execute-macro for functions with no parameters
#define ShellCommandExecute0() \
  if (this->paramCount == 0) \
    SHELLCOMMANDEXECUTER(_0)()

//! execute-macro for functions with one parameter
#define ShellCommandExecute1(t1) \
   else if (this->paramCount == 1 && this->parameters[0] == t1##_PARAM) \
    SHELLCOMMANDEXECUTER(_1_##t1)(t1##_FUNC(parameters, t1##_DEFGRAB(0)))

//! execute-macro for functions with two parameters
#define ShellCommandExecute2(t1,t2) \
   else if (this->paramCount == 2 && this->parameters[0] == t1##_PARAM && this->parameters[1] == t2##_PARAM) \
    SHELLCOMMANDEXECUTER(_2_##t1##_##t2)(t1##_FUNC(sub.getString(0), t1##_DEFGRAB(0)), t2##_FUNC(sub.getString(1), t2##_DEFGRAB(1)))

//! execute-macro for functions with three parameters
#define ShellCommandExecute3(t1,t2,t3) \
   else if (this->paramCount == 3 && this->parameters[0] == t1##_PARAM && this->parameters[1] == t2##_PARAM && this->parameters[2] == t3##_PARAM) \
    SHELLCOMMANDEXECUTER(_3_##t1##_##t2##_##t3)(t1##_FUNC(sub.getString(0), t1##_DEFGRAB(0)), t2##_FUNC(sub.getString(1), t2##_DEFGRAB(1)), t3##_FUNC(sub.getString(2), t3##_DEFGRAB(2)))

//! execute-macro for functions with four parameters
#define ShellCommandExecute4(t1,t2,t3,t4) \
   else if (this->paramCount == 4 && this->parameters[0] == t1##_PARAM && this->parameters[1] == t2##_PARAM && this->parameters[2] == t3##_PARAM && this->parameters[3] == t4##_PARAM) \
    SHELLCOMMANDEXECUTER(_4_##t1##_##t2##_##t3##_##t4)(t1##_FUNC(sub.getString(0), t1##_DEFGRAB(0)), t2##_FUNC(sub.getString(1), t2##_DEFGRAB(1)), t3##_FUNC(sub.getString(2), t3##_DEFGRAB(2)), t4##_FUNC(sub.getString(3), t4##_DEFGRAB(3)))

//! execute-macro for functions with five parameters
#define ShellCommandExecute5(t1,t2,t3,t4,t5) \
   else if (this->paramCount == 5 && this->parameters[0] == t1##_PARAM && this->parameters[1] == t2##_PARAM && this->parameters[2] == t3##_PARAM && this->parameters[3] == t4##_PARAM && this->parameters[4] == t5##_PARAM) \
    SHELLCOMMANDEXECUTER(_5_##t1##_##t2##_##t3##_##t4##_##t5)(t1##_FUNC(sub.getString(0), t1##_DEFGRAB(0)), t2##_FUNC(sub.getString(1), t2##_DEFGRAB(1)), t3##_FUNC(sub.getString(2), t3##_DEFGRAB(2)), t4##_FUNC(sub.getString(3), t4##_DEFGRAB(3)), t5##_FUNC(sub.getString(4), t5##_DEFGRAB(4)))


//! keeps information about a ShellCommand
template<class T> class ShellCommand : public ShellCommandBase
{
  public:
#ifdef FUNCTOR_LIST
#undef FUNCTOR_LIST
#endif
#ifdef SHELLCOMMAND
#undef SHELLCOMMAND
#endif
#define SHELLCOMMAND                       ShellCommand
#ifdef SHELLCOMMANDEXECUTER
#undef SHELLCOMMANDEXECUTER
#endif
#define SHELLCOMMANDEXECUTER(nameExt)      (dynamic_cast<T*>(object)->*(fp.functionPointer##nameExt))
#ifdef SHELLCOMMANDINCLASS
#undef SHELLCOMMANDINCLASS
#endif
#define SHELLCOMMANDINCLASS(FUNCTION)      (T::FUNCTION)
#ifdef SHELLCOMMANDTYPE
#undef SHELLCOMMANDTYPE
#endif
#define SHELLCOMMANDTYPE                   ShellCommand_Objective
//! FUNCTOR_LIST is the List of command-registerers
#define FUNCTOR_LIST(x) ShellCommandRegister ## x
#include "functor_list.h"
#undef FUNCTOR_LIST


  private:
//! FUNCTOR_LIST is the List of FunctionPointers
    union FunctionPointers {
#define FUNCTOR_LIST(x) ShellCommandFunctionPoiter ## x
#include "functor_list.h"
#undef FUNCTOR_LIST
    } fp;

//! FUNCTOR_LIST is the List of CommandConstructors
#define FUNCTOR_LIST(x) ShellCommandConstructor ## x
#include "functor_list.h"
#undef FUNCTOR_LIST

    virtual void executeCommand (BaseObject* object, const char* parameters)
    {
      SubString sub(parameters, true);
//! FUNCTOR_LIST is the List of Executive Functions
#define FUNCTOR_LIST(x) ShellCommandExecute ## x
#include "functor_list.h"
#undef FUNCTOR_LIST
    }
};

//! keeps information about a ShellCommand, that points to a Static Function
template<class T> class ShellCommandStatic : public ShellCommandBase
{
  public:
#ifdef FUNCTOR_LIST
#undef FUNCTOR_LIST
#endif
#ifdef SHELLCOMMAND
#undef SHELLCOMMAND
#endif
#define SHELLCOMMAND                      ShellCommandStatic
#ifdef SHELLCOMMANDEXECUTER
#undef SHELLCOMMANDEXECUTER
#endif
#define SHELLCOMMANDEXECUTER(nameExt)     fp.functionPointer##nameExt
#ifdef SHELLCOMMANDINCLASS
#undef SHELLCOMMANDINCLASS
#endif
#define SHELLCOMMANDINCLASS(FUNCTION)     (FUNCTION)
#ifdef SHELLCOMMANDTYPE
#undef SHELLCOMMANDTYPE
#endif
#define SHELLCOMMANDTYPE                   ShellCommand_Static

//! FUNCTOR_LIST is the List of command-registerers
#define FUNCTOR_LIST(x) ShellCommandRegister ## x
#include "functor_list.h"
#undef FUNCTOR_LIST

  private:
//! FUNCTOR_LIST is the List of FunctionPointers
    union FunctionPointers {
#define FUNCTOR_LIST(x) ShellCommandFunctionPoiter ## x
#include "functor_list.h"
#undef FUNCTOR_LIST
    } fp;

//! FUNCTOR_LIST is the List of CommandConstructors
#define FUNCTOR_LIST(x) ShellCommandConstructor ## x
#include "functor_list.h"
#undef FUNCTOR_LIST

    virtual void executeCommand (BaseObject* object, const char* parameters)
    {
  SubString sub(parameters, true);
//! FUNCTOR_LIST is the List of Executive Functions
#define FUNCTOR_LIST(x) ShellCommandExecute ## x
#include "functor_list.h"
#undef FUNCTOR_LIST
    }
};

//! A Class, that handles aliases.
class ShellCommandAlias
{
  friend class ShellCommandBase;
  public:
    /** @returns the Name of the Alias. */
    const char* getName() const { return this->aliasName; };
    /** @returns the Command, this Alias is asociated with */
    ShellCommandBase* getCommand() const { return this->command; };

  private:
    /** @param aliasName the name of the Alias @param command the Command, to associate this alias with */
    ShellCommandAlias(const char* aliasName, ShellCommandBase* command) { this->aliasName = aliasName; this->command = command; };

  private:
    const char*         aliasName;       //!< the name of the Alias
    ShellCommandBase*   command;         //!< a pointer to the command, this alias executes.
};

#endif /* _SHELL_COMMAND_H */