/*
 * ArrayAccessor.h
 *
 *  Created on: Jun 07, 2016
 *      Author: Martin Hierholzer
 */

#ifndef CHIMERATK_ARRAY_ACCESSOR_H
#define CHIMERATK_ARRAY_ACCESSOR_H

#include <string>

#include <boost/smart_ptr/shared_ptr.hpp>
#include <boost/thread.hpp>

#include <ChimeraTK/OneDRegisterAccessor.h>

#include "Application.h"
#include "InversionOfControlAccessor.h"
#include "Profiler.h"

namespace ChimeraTK {

  /********************************************************************************************************************/

  /** Accessor for array variables (i.e. vectors). Note for users: Use the
   * convenience classes ArrayPollInput, ArrayPushInput, ArrayOutput instead of
   * this class directly. */
  template<typename UserType>
  class ArrayAccessor : public ChimeraTK::OneDRegisterAccessor<UserType>,
                        public InversionOfControlAccessor<ArrayAccessor<UserType>> {
   public:
    using InversionOfControlAccessor<ArrayAccessor<UserType>>::operator VariableNetworkNode;
    using InversionOfControlAccessor<ArrayAccessor<UserType>>::operator>>;
    void replace(const ChimeraTK::NDRegisterAccessorAbstractor<UserType>& newAccessor) = delete;
    using InversionOfControlAccessor<ArrayAccessor<UserType>>::replace;
    ArrayAccessor<UserType>& operator=(ArrayAccessor<UserType>& other) = delete;
    using ChimeraTK::OneDRegisterAccessor<UserType>::operator=;

    /** Move constructor */
    ArrayAccessor(ArrayAccessor<UserType>&& other) {
      InversionOfControlAccessor<ArrayAccessor<UserType>>::replace(std::move(other));
    }

    /** Move assignment */
    ArrayAccessor<UserType>& operator=(ArrayAccessor<UserType>&& other) {
      // Having a move-assignment operator is required to use the move-assignment
      // operator of a module containing an accessor.
      InversionOfControlAccessor<ArrayAccessor<UserType>>::replace(std::move(other));
      return *this;
    }

    bool write(ChimeraTK::VersionNumber versionNumber) = delete;

    bool write() {
      auto versionNumber = this->getOwner()->getCurrentVersionNumber();
      bool dataLoss = ChimeraTK::OneDRegisterAccessor<UserType>::write(versionNumber);
      if(dataLoss) Application::incrementDataLossCounter();
      return dataLoss;
    }

    TransferFuture readAsync() {
      throw ChimeraTK::logic_error("ArrayAccessor::readAsync() is currently not "
                                   "supported by ApplicationCore!");
    }

   protected:
    friend class InversionOfControlAccessor<ArrayAccessor<UserType>>;

    ArrayAccessor(Module* owner, const std::string& name, VariableDirection direction, std::string unit,
        size_t nElements, UpdateMode mode, const std::string& description,
        const std::unordered_set<std::string>& tags = {})
    : InversionOfControlAccessor<ArrayAccessor<UserType>>(
          owner, name, direction, unit, nElements, mode, description, &typeid(UserType), tags) {}

    /** Default constructor creates a dysfunctional accessor (to be assigned with
     * a real accessor later) */
    ArrayAccessor() {}
  };

  /********************************************************************************************************************/

  /** Convenience class for input array accessors with UpdateMode::push */
  template<typename UserType>
  struct ArrayPushInput : public ArrayAccessor<UserType> {
    ArrayPushInput(Module* owner, const std::string& name, std::string unit, size_t nElements,
        const std::string& description, const std::unordered_set<std::string>& tags = {})
    : ArrayAccessor<UserType>(
          owner, name, {VariableDirection::consuming, false}, unit, nElements, UpdateMode::push, description, tags) {}
    ArrayPushInput() : ArrayAccessor<UserType>() {}
    using ArrayAccessor<UserType>::operator=;
  };

  /********************************************************************************************************************/

  /** Convenience class for input array accessors with UpdateMode::poll */
  template<typename UserType>
  struct ArrayPollInput : public ArrayAccessor<UserType> {
    ArrayPollInput(Module* owner, const std::string& name, std::string unit, size_t nElements,
        const std::string& description, const std::unordered_set<std::string>& tags = {})
    : ArrayAccessor<UserType>(
          owner, name, {VariableDirection::consuming, false}, unit, nElements, UpdateMode::poll, description, tags) {}
    ArrayPollInput() : ArrayAccessor<UserType>() {}
    void doReadTransfer() { this->doReadTransferLatest(); }
    void read() { this->readLatest(); }
    using ArrayAccessor<UserType>::operator=;
  };

  /********************************************************************************************************************/

  /** Convenience class for output array accessors (always UpdateMode::push) */
  template<typename UserType>
  struct ArrayOutput : public ArrayAccessor<UserType> {
    ArrayOutput(Module* owner, const std::string& name, std::string unit, size_t nElements,
        const std::string& description, const std::unordered_set<std::string>& tags = {})
    : ArrayAccessor<UserType>(
          owner, name, {VariableDirection::feeding, false}, unit, nElements, UpdateMode::push, description, tags) {}
    ArrayOutput() : ArrayAccessor<UserType>() {}
    using ArrayAccessor<UserType>::operator=;
  };

  /********************************************************************************************************************/

  /** Convenience class for input array accessors with return channel ("write
   * back") and UpdateMode::push */
  template<typename UserType>
  struct ArrayPushInputWB : public ArrayAccessor<UserType> {
    ArrayPushInputWB(Module* owner, const std::string& name, std::string unit, size_t nElements,
        const std::string& description, const std::unordered_set<std::string>& tags = {})
    : ArrayAccessor<UserType>(
          owner, name, {VariableDirection::consuming, true}, unit, nElements, UpdateMode::push, description, tags) {}
    ArrayPushInputWB() : ArrayAccessor<UserType>() {}
    using ArrayAccessor<UserType>::operator=;
  };

  /********************************************************************************************************************/

  /** Convenience class for output array accessors with return channel ("read
   * back") (always UpdateMode::push) */
  template<typename UserType>
  struct ArrayOutputRB : public ArrayAccessor<UserType> {
    ArrayOutputRB(Module* owner, const std::string& name, std::string unit, size_t nElements,
        const std::string& description, const std::unordered_set<std::string>& tags = {})
    : ArrayAccessor<UserType>(
          owner, name, {VariableDirection::feeding, true}, unit, nElements, UpdateMode::push, description, tags) {}
    ArrayOutputRB() : ArrayAccessor<UserType>() {}
    using ArrayAccessor<UserType>::operator=;
  };

  /********************************************************************************************************************/

} /* namespace ChimeraTK */

#endif /* CHIMERATK_ARRAY_ACCESSOR_H */