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#ifndef ROL_SIMCONTROLLER_H
#define ROL_SIMCONTROLLER_H

#include "ROL_Vector.hpp"

namespace ROL {

template <class Real, class Key=std::vector<Real>>
class SimController {
private:
  // Storage
  std::map<Key,int>               indices_;
  std::vector<bool>               flags_;
  std::vector<Ptr<Vector<Real>>>  vectors_;
  int maxIndex_;

  // Update flags
  bool objUpdated_, conUpdated_;

  void reset(const bool flag = true) {
    if ( flag ) {
      typename std::map<Key,int>::iterator it;
      for (it = indices_.begin(); it != indices_.end(); ++it) {
        flags_[it->second] = false;
      }
    }
  }

public:
  /** \brief Constructor.
  */
  SimController(void)
    : maxIndex_(0), objUpdated_(false), conUpdated_(false) { 
    indices_.clear();
    flags_.clear();
    vectors_.clear();
  }

  /** \brief Objective function update for SimController storage.
  */
  void objectiveUpdate(const bool flag = true) {
    if (!conUpdated_) {
      reset(flag);
    }
    objUpdated_ = true;
    if (conUpdated_ && objUpdated_) {
      objUpdated_ = false;
      conUpdated_ = false;
    }
  }

  /** \brief Equality constraint update for SimController storage.
  */
  void equalityConstraintUpdate(const bool flag = true) {
    if (!objUpdated_) {
      reset(flag);
    }
    conUpdated_ = true;
    if (conUpdated_ && objUpdated_) {
      objUpdated_ = false;
      conUpdated_ = false;
    }
  }

  /** \brief Return vector corresponding to input parameter.
  */
  bool get(Vector<Real> &x,
           const Key &param) {
    int count = indices_.count(param);
    bool flag = false;
    int index = maxIndex_;
    if (count) {
      typename std::map<Key,int>::iterator it
        = indices_.find(param);
      index = it->second;
      flag  = flags_[index];
      if (flag) {
        x.set(*vectors_[index]);
      }
    }
    else {
      indices_.insert(
        std::pair<Key,int>(param, index));
      flags_.push_back(false);
      vectors_.push_back(x.clone()); 
      maxIndex_++;
    }
    return flag;
  }

  /** \brief Set vector corresponding to input parameter.
  */
  void set(const Vector<Real> &x,
           const Key &param) {
    int count = indices_.count(param);
    int index = maxIndex_;
    if (count) {
      typename std::map<Key,int>::iterator it
        = indices_.find(param);
      index = it->second;
      flags_[index] = true;
      vectors_[index]->set(x);
    }
    else {
      indices_.insert(
        std::pair<Key,int>(param, index));
      flags_.push_back(true);
      vectors_.push_back(x.clone()); 
      vectors_[index]->set(x);
      maxIndex_++;
    }
  }
}; // class SimController

} // namespace ROL

#endif
