/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   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, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: ...
*/

//#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_

#include "shell_command.h"

#include "list.h"
#include "debug.h"
#include "class_list.h"

#include "key_names.h"
#include <stdarg.h>
#include <stdio.h>
#include <string.h>

using namespace std;

/**
 * creates a new ShellCommandClass
 * @param className the Name of the command-class to create
 */
ShellCommandClass::ShellCommandClass(const char* className)
{
  this->setClassID(CL_SHELL_COMMAND_CLASS, "ShellCommandClass");
  this->setName(className);

  this->className = className;
  this->classID = CL_NULL;
  this->commandList = new tList<ShellCommandBase>;

  ShellCommandClass::commandClassList->add(this);
}

/**
 * destructs the shellCommandClass again
 */
ShellCommandClass::~ShellCommandClass()
{
  tIterator<ShellCommandBase>* iterator = this->commandList->getIterator();
  ShellCommandBase* elem = iterator->firstElement();
  while(elem != NULL)
  {
    delete elem;
    elem = iterator->nextElement();
  }
  delete iterator;
  delete this->commandList;
}

/**
 * collects the Commands registered to some class.
 * @param className the name of the Class to collect the Commands from.
 * @param stringList a List to paste the Commands into.
 * @returns true on success, false otherwise
 */
bool ShellCommandClass::getCommandListOfClass(const char* className, tList<const char>* stringList)
{
  if (stringList == NULL || className == NULL)
    return false;

  tIterator<ShellCommandClass>* iterator = ShellCommandClass::commandClassList->getIterator();
  ShellCommandClass* elem = iterator->firstElement();
  while(elem != NULL)
  {
    if (!strcmp (elem->getName(), className))
    {
      tIterator<ShellCommandBase>* itFkt = elem->commandList->getIterator();
      ShellCommandBase* command = itFkt->firstElement();
      while (command != NULL)
      {
        stringList->add(command->getName());
        command = itFkt->nextElement();
      }
      delete itFkt;
    }

    elem = iterator->nextElement();
  }
  delete iterator;
  return true;
}

/**
 * collects the Aliases registered to the ShellCommands
 * @param stringList a List to paste the Aliases into.
 * @returns true on success, false otherwise
 */
bool ShellCommandClass::getCommandListOfAlias(tList<const char>* stringList)
{
  if (stringList == NULL || ShellCommandClass::aliasList == NULL)
    return false;

  tIterator<ShellCommandAlias>* iterator = ShellCommandClass::aliasList->getIterator();
   ShellCommandAlias* elem = iterator->firstElement();
   while(elem != NULL)
   {
     stringList->add(elem->getName());
     elem = iterator->nextElement();
   }
   delete iterator;
   return true;
}

/**
 * unregisters all Commands that exist
 */
void ShellCommandClass::unregisterAllCommands()
{
  // unregister all commands
  tIterator<ShellCommandClass>* iterator = ShellCommandClass::commandClassList->getIterator();
  ShellCommandClass* elem = iterator->firstElement();
  while(elem != NULL)
  {
    delete elem;

    elem = iterator->nextElement();
  }
  delete iterator;

  delete ShellCommandClass::commandClassList;
  ShellCommandClass::commandClassList = NULL;

  // unregister all aliases (there should be nothing to do here :))
  if (ShellCommandClass::aliasList != NULL)
  {
    tIterator<ShellCommandAlias>* itAL = ShellCommandClass::aliasList->getIterator();
    ShellCommandAlias* elemAL = itAL->firstElement();
    while(elemAL != NULL)
    {
      delete elemAL;
      elemAL = itAL->nextElement();
    }
    delete itAL;
    delete ShellCommandClass::aliasList;
    ShellCommandClass::aliasList = NULL;
  }
}

/**
 * checks if a Class is already registered to the Commands' class-stack
 * @param className the Name of the Class to check for
 * @returns the CommandClass if found, NULL otherwise
 */
const ShellCommandClass* ShellCommandClass::isRegistered(const char* className)
{
  if (ShellCommandClass::commandClassList == NULL)
    initCommandClassList();

  tIterator<ShellCommandClass>* iterator = ShellCommandClass::commandClassList->getIterator();
  ShellCommandClass* elem = iterator->firstElement();
  while(elem != NULL)
  {
    if (!strcmp(className, elem->className))
    {
      if (elem->classID == CL_NULL)
        elem->classID = ClassList::StringToID(className);

      delete iterator;
      return elem;
    }
    elem = iterator->nextElement();
  }
  delete iterator;
  return NULL;
}

/**
 * searches for a CommandClass
 * @param className the name of the CommandClass
 * @returns the CommandClass if found, or a new CommandClass if not
 */
ShellCommandClass* ShellCommandClass::getCommandClass(const char* className)
{
  if (ShellCommandClass::commandClassList == NULL)
    initCommandClassList();

  tIterator<ShellCommandClass>* iterator = ShellCommandClass::commandClassList->getIterator();
  ShellCommandClass* elem = iterator->firstElement();
  while(elem != NULL)
  {
    if (!strcmp(className, elem->className))
    {
      delete iterator;
      return elem;
    }
    elem = iterator->nextElement();
  }
  delete iterator;
  return new ShellCommandClass(className);
}

/**
 * initializes the CommandList (if it is NULL)
 */
void ShellCommandClass::initCommandClassList()
{
  if (ShellCommandClass::commandClassList == NULL)
  {
    ShellCommandClass::commandClassList = new tList<ShellCommandClass>;
    ShellCommandStatic<ShellCommandBase>::registerCommand("debug", "ShellCommand", ShellCommandBase::debug);
  }
}

void ShellCommandClass::help(const char* className)
{
  if (className == NULL)
    return;
  if (likely(ShellCommandClass::commandClassList != NULL))
  {
    tIterator<ShellCommandClass>* itCL = ShellCommandClass::commandClassList->getIterator();
    ShellCommandClass* elemCL = itCL->firstElement();
    while(elemCL != NULL)
    {
      if (elemCL->className && !strcasecmp(className, elemCL->className))
      {
        PRINT(0)("Class:'%s' registered %d commands: \n", elemCL->className, elemCL->commandList->getSize());
        tIterator<ShellCommandBase>* iterator = elemCL->commandList->getIterator();
        const ShellCommandBase* elem = iterator->firstElement();
        while(elem != NULL)
        {
          PRINT(0)("  command:'%s' : params:%d: ", elem->getName(), elem->paramCount);
          for (unsigned int i = 0; i< elem->paramCount; i++)
            PRINT(0)("%s ", ShellCommandBase::paramToString(elem->parameters[i]));
          if (elem->description != NULL)
            PRINT(0)("- %s", elem->description);
          PRINT(0)("\n");
          elem = iterator->nextElement();
        }
        delete iterator;

        delete itCL;
        return;
      }
      elemCL = itCL->nextElement();
    }
    delete itCL;
    PRINTF(3)("Class %s not found in Command's classes\n", className);
  }
  else
  {
    PRINTF(1)("List of commandClasses does not exist");
  }
}

tList<ShellCommandClass>* ShellCommandClass::commandClassList = NULL;
tList<ShellCommandAlias>* ShellCommandClass::aliasList = NULL;










////////////////////////
// SHELL COMMAND BASE //
////////////////////////
/**
 * constructs and registers a new Command
 * @param commandName the name of the Command
 * @param className the name of the class to apply this command to
 * @param paramCount the count of parameters this command takes
 */
ShellCommandBase::ShellCommandBase(const char* commandName, const char* className, unsigned int paramCount, ...)
{
  this->setClassID(CL_SHELL_COMMAND, "ShellCommand");
  this->setName(commandName);
  this->description = NULL;
  this->alias = NULL;

//  this->classID = classID;
  this->shellClass = ShellCommandClass::getCommandClass(className); //ClassList::IDToString(classID);
  if (this->shellClass != NULL)
    this->shellClass->commandList->add(this);
  // handling parameters, and storing them:
  if (paramCount > FUNCTOR_MAX_ARGUMENTS)
    paramCount = FUNCTOR_MAX_ARGUMENTS;
  this->paramCount = paramCount;
  this->parameters = new unsigned int[paramCount];
  this->defaultValue = new MultiType[paramCount];

  va_list parameterList;
  va_start(parameterList, paramCount);

  // What Parameters we have got
  for (unsigned int i = 0; i < paramCount; i++)
    this->parameters[i] = va_arg(parameterList, int);
}

/**
 * deconstructs a ShellCommand
 */
ShellCommandBase::~ShellCommandBase()
{
  delete[] this->parameters;
  delete[] this->defaultValue;
  if (this->alias != NULL && ShellCommandClass::aliasList != NULL)
  {
    ShellCommandClass::aliasList->remove(this->alias);
    delete this->alias;
  }
}

/**
 * unregister an existing commandName
 * @param className the name of the Class the command belongs to.
 * @param commandName the name of the command itself
 */
void ShellCommandBase::unregisterCommand(const char* commandName, const char* className)
{
  if (ShellCommandClass::commandClassList == NULL)
    ShellCommandClass::initCommandClassList();

 const ShellCommandClass* checkClass = ShellCommandClass::isRegistered(className);

 if (checkClass != NULL)
  {
    tIterator<ShellCommandBase>* iterator = checkClass->commandList->getIterator();
    ShellCommandBase* elem = iterator->firstElement();
    while(elem != NULL)
    {
      if (!strcmp(commandName, elem->getName()))
      {
        checkClass->commandList->remove(elem);
        delete elem;
        break;
      }
      elem = iterator->nextElement();
    }
    delete iterator;

    if (checkClass->commandList->getSize() == 0)
    {
      ShellCommandClass::commandClassList->remove(checkClass);
      delete checkClass;
    }
  }
}

/**
 * checks if a command has already been registered.
 * @param commandName the name of the Command
 * @param className the name of the Class the command should apply to.
 * @param paramCount how many arguments the Command takes
 * @returns true, if the command is registered/false otherwise
 *
 * This is used internally, to see, if we have multiple command subscriptions.
 * This is checked in the registerCommand-function.
 */
bool ShellCommandBase::isRegistered(const char* commandName, const char* className, unsigned int paramCount, ...)
{
  if (ShellCommandClass::commandClassList == NULL)
  {
    ShellCommandClass::initCommandClassList();
    return false;
  }

  const ShellCommandClass* checkClass = ShellCommandClass::isRegistered(className);
  if (checkClass != NULL)
  {
    tIterator<ShellCommandBase>* iterator = checkClass->commandList->getIterator();
    ShellCommandBase* elem = iterator->firstElement();
    while(elem != NULL)
   {
     if (!strcmp(commandName, elem->getName()))
     {
       PRINTF(2)("Command already registered\n");
       delete iterator;
       return true;
      }
     elem = iterator->nextElement();
   }
   delete iterator;
   return false;
  }
  else
    return false;
}


/**
 * executes commands
 * @param executionString the string containing the following input
 * ClassName [ObjectName] functionName [parameter1[,parameter2[,...]]]
 * @return true on success, false otherwise.
 */
bool ShellCommandBase::execute(const char* executionString)
{
  if (ShellCommandClass::commandClassList == NULL)
    return false;

  long classID = CL_NULL;                 //< the classID retrieved from the Class.
  ShellCommandClass* commandClass = NULL; //< the command class this command applies to.
  tList<BaseObject>* objectList = NULL;   //< the list of Objects stored in classID
  BaseObject* objectPointer = NULL;       //< a pointer to th Object to Execute the command on
  bool emptyComplete = false;             //< if the completion input is empty string. e.g ""
  unsigned int fktPos = 1;                //< the position of the function (needed for finding it)
//  long completeType = SHELLC_NONE;      //< the Type we'd like to complete.
  SubString inputSplits(executionString, true);

  if (inputSplits.getCount() == 0)
    return false;
  if (inputSplits.getCount() >= 1)
  {
    // CHECK FOR ALIAS
    if (ShellCommandClass::aliasList != NULL)
    {
      tIterator<ShellCommandAlias>* itAL = ShellCommandClass::aliasList->getIterator();
      ShellCommandAlias* elemAL = itAL->firstElement();
      while(elemAL != NULL)
      {
        if (elemAL->getName() != NULL && !strcmp(elemAL->getName(), inputSplits.getString(0)) && elemAL->getCommand() != NULL &&
            elemAL->getCommand()->shellClass != NULL )
        {
          objectList = ClassList::getList(elemAL->getCommand()->shellClass->getName());
          if (objectList != NULL)
          {
            if (inputSplits.getCount() > 1)
              elemAL->getCommand()->executeCommand(objectList->firstElement(), executionString+inputSplits.getOffset(1));
            else
              elemAL->getCommand()->executeCommand(objectList->firstElement(), "");
            delete itAL;
            return true;
          }
        }
        elemAL = itAL->nextElement();
      }
      delete itAL;
    }
    // looking for a Matching Class
    if (likely(ShellCommandClass::commandClassList != NULL))
    {
      tIterator<ShellCommandClass>* itCL = ShellCommandClass::commandClassList->getIterator();
      ShellCommandClass* elemCL = itCL->firstElement();
      while(elemCL != NULL)
      {
        if (elemCL->getName() && !strcasecmp(inputSplits.getString(0), elemCL->getName()))
        {
          //elemCL->getName();
          classID = ClassList::StringToID(elemCL->getName());
          commandClass = elemCL;
          objectList = ClassList::getList(classID);
          break;
        }
        elemCL = itCL->nextElement();
      }
      delete itCL;
    }

    if (commandClass != NULL && inputSplits.getCount() >= 2)
    {
      if (objectList != NULL)
      {
        // Checking for a Match in the Objects of classID (else take the first)
        tIterator<BaseObject>* itBO = objectList->getIterator();
        BaseObject* enumBO = itBO->firstElement();
        while(enumBO)
        {
          if (enumBO->getName() != NULL && !strcasecmp(enumBO->getName(), inputSplits.getString(1)))
          {
            objectPointer = enumBO;
            fktPos = 2;
            break;
          }
          enumBO = itBO->nextElement();
         }
         delete itBO;

      //
        if (objectPointer == NULL)
          objectPointer = objectList->firstElement();
      }
      // match a function.
      if (commandClass != NULL && (fktPos == 1 || (fktPos == 2 && inputSplits.getCount() >= 3)))
      {
        tIterator<ShellCommandBase>* itCMD = commandClass->commandList->getIterator();
        ShellCommandBase* enumCMD = itCMD->firstElement();
        while (enumCMD != NULL)
        {
          if (!strcmp(enumCMD->getName(), inputSplits.getString(fktPos)))
          {
            if (objectPointer == NULL && enumCMD->functorType == ShellCommand_Objective)
            {
              delete itCMD;
              return false;
            }
            if (inputSplits.getCount() > fktPos+1)
              enumCMD->executeCommand(objectPointer, executionString+inputSplits.getOffset(fktPos +1));
            else
              enumCMD->executeCommand(objectPointer, "");
            delete itCMD;
            return true;
          }

          enumCMD = itCMD->nextElement();
        }
        delete itCMD;
      }
    }
  }
}

/**
 * lets a command be described
 * @param description the description of the Given command
 */
ShellCommandBase* ShellCommandBase::describe(const char* description)
{
  if (this == NULL)
    return NULL;
 else
 {
   this->description = description;
   return this;
 }
}

/**
 * adds an Alias to this Command
 * @param alias the name of the Alias to set
 * @returns itself
 */
ShellCommandBase* ShellCommandBase::setAlias(const char* alias)
{
  if (this == NULL)
    return NULL;

  if (this->alias != NULL)
  {
    PRINTF(2)("not more than one Alias allowed for functions (%s::%s)\n", this->getName(), this->shellClass->getName());
  }
  else
  {
    if (ShellCommandClass::aliasList == NULL)
      ShellCommandClass::aliasList = new tList<ShellCommandAlias>;

    ShellCommandAlias* aliasCMD = new ShellCommandAlias(alias, this);
    ShellCommandClass::aliasList->add(aliasCMD);
    this->alias = aliasCMD;
  }
  return this;
}

/**
 * sets default Values of the Commands
 * @param count how many default Values to set.
 * @param ... the default Values in order. They will be cast to the right type
 * @returns itself
 *
 * Be aware, that when you use this Function, you !!MUST!! match the input as
 * count, [EXACTLY THE SAME AS IF YOU WOULD CALL THE FUNCTION UP TO count ARGUMENTS]
 */
ShellCommandBase* ShellCommandBase::defaultValues(unsigned int count, ...)
{
  if (this == NULL)
    return NULL;
  if (count == 0)
    return this;
  if (count > this->paramCount)
    count = this->paramCount;

  va_list defaultList;
  va_start(defaultList, count);

  for (unsigned int i = 0; i < count; i++)
  {


    switch (this->parameters[i])
    {
      case ParameterBool:
        this->defaultValue[i].setInt(va_arg(defaultList, int));
        break;
      case ParameterChar:
        this->defaultValue[i].setChar((char)va_arg(defaultList, int));
        break;
      case ParameterString:
        this->defaultValue[i].setString(va_arg(defaultList, char*));
        break;
      case ParameterInt:
        this->defaultValue[i].setInt(va_arg(defaultList, int));
        break;
      case ParameterUInt:
        this->defaultValue[i].setInt((int)va_arg(defaultList, unsigned int));
        break;
      case ParameterFloat:
        this->defaultValue[i].setFloat(va_arg(defaultList, double));
        break;
      case ParameterLong:
        this->defaultValue[i].setInt((int) va_arg(defaultList, long));
        break;
      default:
        break;
    }
  }
  return this;
}

/**
 * prints out nice information about the Shells Commands
 */
void ShellCommandBase::debug()
{
  if (ShellCommandClass::commandClassList == NULL)
  {
    PRINT(0)("No Command registered.\n");
    return;
  }

  tIterator<ShellCommandClass>* iteratorCL = ShellCommandClass::commandClassList->getIterator();
  ShellCommandClass* elemCL = iteratorCL->firstElement();
  while(elemCL != NULL)
  {
    PRINT(0)("Class:'%s' registered %d commands: \n", elemCL->className, elemCL->commandList->getSize());
    tIterator<ShellCommandBase>* iterator = elemCL->commandList->getIterator();
    const ShellCommandBase* elem = iterator->firstElement();
    while(elem != NULL)
    {
      PRINT(0)("  command:'%s' : params:%d: ", elem->getName(), elem->paramCount);
      for (unsigned int i = 0; i< elem->paramCount; i++)
       printf("%s ", ShellCommandBase::paramToString(elem->parameters[i]));
      if (elem->description != NULL)
       printf("- %s", elem->description);
      printf("\n");

      elem = iterator->nextElement();
    }
    delete iterator;
    elemCL = iteratorCL->nextElement();
  }
  delete iteratorCL;
}

/**
 * converts a Parameter to a String
 * @param parameter the Parameter we have.
 * @returns the Name of the Parameter at Hand
 */
const char* ShellCommandBase::paramToString(long parameter)
{
  switch (parameter)
  {
    case ParameterBool:
      return "BOOL";
      break;
    case ParameterChar:
      return "CHAR";
      break;
    case ParameterString:
      return "STRING";
      break;
    case ParameterInt:
      return "INT";
      break;
    case ParameterUInt:
      return "UINT";
      break;
    case ParameterFloat:
      return "FLOAT";
      break;
    case ParameterLong:
      return "LONG";
      break;
    default:
      return "NULL";
      break;
  }
}