/*
 * ActionSequenze.cpp
 *
 *  Created on: Dec 17, 2009
 *      Author: crueger
 */

#include "Actions/ActionSequence.hpp"
#include "Actions/Action.hpp"

#include "Helpers/Assert.hpp"

using namespace std;

ActionSequence::ActionSequence()
{}

ActionSequence::~ActionSequence()
{}


void ActionSequence::addAction(Action* _action){
  actions.push_back(_action);
}

Action* ActionSequence::removeLastAction(){
  if(actions.empty()) {
    return 0;
  }
  else {
    Action* theAction;
    theAction = actions.back();
    actions.pop_back();
    return theAction;
  }
}

// this method is used outside the ActionModule
// Each action registers itself with the history
void ActionSequence::callAll(){
  for(actionSet::iterator it=actions.begin(); it!=actions.end(); it++){
    // we want to have a global bookkeeping for all actions in the sequence, so
    // we bypass the normal call
    (*it)->call();
  }
}

// This method is used internally when MakroActions are constructed.
// In this case only the makro Action should be registered and
// handle the states
ActionSequence::stateSet ActionSequence::callAll(bool){
  stateSet states;
  for(actionSet::iterator it=actions.begin(); it!=actions.end(); it++){
    // we want to have a global bookkeeping for all actions in the sequence, so
    // we bypass the normal call
    Action::state_ptr state = (*it)->performCall();
    states.push_back(state);
  }
  return states;
}

ActionSequence::stateSet ActionSequence::undoAll(stateSet states){
  ASSERT(canUndo(),"Trying to undo a sequence that contains methods that can't be undone");
  stateSet res;
  actionSet::reverse_iterator actionRit = actions.rbegin();
  stateSet::reverse_iterator stateRit = states.rbegin();
  for(;actionRit!=actions.rend();++actionRit,++stateRit){
    ASSERT(stateRit!=states.rend(),"End of states prematurely reached.");
    if((*actionRit)->shouldUndo()){
      Action::state_ptr newState = (*actionRit)->performUndo(*stateRit);
      // The order of the states has to correspond to the order of the actions
      // this is why we have to add at the beginning
      res.push_front(newState);
    }
    else{
      res.push_front(Action::success);
    }
  }
  return res;
}

ActionSequence::stateSet ActionSequence::redoAll(stateSet states){
  stateSet res;
  actionSet::iterator actionIt = actions.begin();
  stateSet::iterator stateIt = states.begin();
  for(;actionIt!=actions.end();++actionIt,++stateIt){
    ASSERT(stateIt!=states.end(),"End of states prematurely reached.");
    if((*actionIt)->shouldUndo()){
      Action::state_ptr newState =(*actionIt)->performRedo(*stateIt);
      res.push_back(newState);
    }
    else{
      res.push_back(Action::success);
    }
  }
  return res;
}

bool ActionSequence::canUndo(){
  bool canUndo=true;
  for(deque<Action*>::iterator it=actions.begin(); it!=actions.end(); ++it){
    if((*it)->shouldUndo()){
      canUndo &= (*it)->canUndo();
    }
  }
  return canUndo;
}

bool ActionSequence::shouldUndo(){
  bool shouldUndo = false;
  for(deque<Action*>::iterator it=actions.begin();it!=actions.end();++it){
    shouldUndo |= (*it)->shouldUndo();
  }
  return shouldUndo;
}