ParamDef.h

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/*
 * Copyright (c) 2018-2020 pongasoft
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 *
 * @author Yan Pujante
 */
#pragma once

#include "ParamConverters.h"
#include "ParamSerializers.h"
#include "Messaging.h"
#include "NormalizedState.h"

#include <base/source/fstreamer.h>
#include <pluginterfaces/vst/vsttypes.h>
#include <pluginterfaces/vst/ivsteditcontroller.h>
#include <pluginterfaces/vst/ivstunits.h>

#include <string>
#include <memory>

namespace pongasoft::VST {

using namespace Steinberg;
using namespace Steinberg::Vst;

// forward declaration required for API
namespace GUI::Params {
class IGUIJmbParameter;
}

class IParamDef : public std::enable_shared_from_this<IParamDef>
{
public:
  enum class Owner
  {
    kRT,
    kGUI
  };

  static constexpr int16 kVersionNotDeprecated = -1;

public:
  IParamDef(ParamID const iParamID,
            VstString16 iTitle,
            Owner const iOwner,
            bool const iTransient,
            int16 const iDeprecatedSince) :
    fParamID{iParamID},
    fTitle{std::move(iTitle)},
    fOwner{iOwner},
    fTransient{iTransient},
    fDeprecatedSince{iDeprecatedSince}
  {}

  virtual ~IParamDef() = default;

  bool isDeprecated() const { return fDeprecatedSince > kVersionNotDeprecated; }

public:
  const ParamID fParamID;
  const VstString16 fTitle;
  const Owner fOwner; // who owns the parameter (and which stream will it be saved if non transient)
  const bool fTransient; // not saved in the stream
  const int16 fDeprecatedSince; // at which version the parameter got deprecated
};


class RawVstParamDef : public IParamDef
{
public:
  RawVstParamDef(ParamID const iParamID,
                 VstString16 iTitle,
                 VstString16 iUnits,
                 ParamValue const iDefaultNormalizedValue,
                 int32 const iStepCount,
                 int32 const iFlags,
                 UnitID const iUnitID,
                 VstString16 iShortTitle,
                 int32 const iPrecision,
                 Owner const iOwner,
                 bool const iTransient,
                 int16 const iDeprecatedSince) :
    IParamDef(iParamID, std::move(iTitle), iOwner, iTransient, iDeprecatedSince),
    fUnits{std::move(iUnits)},
    fDefaultValue{Utils::clampE(iDefaultNormalizedValue, 0.0, 1.0)},
    fStepCount{iStepCount},
    fFlags{iFlags},
    fUnitID{iUnitID},
    fShortTitle{std::move(iShortTitle)},
    fPrecision{iPrecision}
  {}

public:
  // readFromStream
  ParamValue readFromStream(IBStreamer &iStreamer) const
  {
    ParamValue res = fDefaultValue;

    ParamValue value;
    if(IBStreamHelper::readDouble(iStreamer, value) == kResultOk)
      res = value;

    return res;
  }

  ParamValue readFromState(NormalizedState const &iState) const
  {
    ParamValue res = fDefaultValue;
    iState.getNormalizedValue(fParamID, res);
    return res;
  }

  tresult writeToState(ParamValue iValue, NormalizedState &oState) const
  {
    return oState.setNormalizedValue(fParamID, iValue);
  }

  // toString
  virtual void toString(ParamValue iNormalizedValue, String128 iString) const
  {
    RawParamConverter::staticToString(iNormalizedValue, iString, fPrecision);
  }

  virtual std::string toUTF8String(ParamValue iNormalizedValue, int32 iPrecision) const
  {
    String128 s;
    s[0] = 0;
    RawParamConverter::staticToString(iNormalizedValue, s, iPrecision >= 0 ? iPrecision : fPrecision);
    return VstUtils::toUT8String(s);
  }

public:
  const VstString16 fUnits;
  const ParamValue fDefaultValue;
  const int32 fStepCount;
  const int32 fFlags;
  const UnitID fUnitID;
  const VstString16 fShortTitle;
  const int32 fPrecision;
};

template<typename T>
class VstParamDef : public RawVstParamDef
{
public:
  using ParamType = T;

  VstParamDef(ParamID const iParamID,
              VstString16 iTitle,
              VstString16 iUnits,
              ParamType const iDefaultValue,
              int32 const iFlags,
              UnitID const iUnitID,
              VstString16 iShortTitle,
              int32 const iPrecision,
              Owner const iOwner,
              bool const iTransient,
              int16 const iDeprecatedSince,
              std::shared_ptr<IParamConverter<ParamType>> iConverter) :
    RawVstParamDef(iParamID,
                   std::move(iTitle),
                   std::move(iUnits),
                   iConverter ? iConverter->normalize(iDefaultValue) : 0,
                   iConverter ? iConverter->getStepCount() : 0,
                   iFlags,
                   iUnitID,
                   std::move(iShortTitle),
                   iPrecision,
                   iOwner,
                   iTransient,
                   iDeprecatedSince),
    fDefaultValue{iDefaultValue},
    fConverter{std::move(iConverter)}
  {
  }

  ParamType readFromState(NormalizedState const &iState) const
  {
    return denormalize(RawVstParamDef::readFromState(iState));
  }

  tresult writeToState(ParamType const &iValue, NormalizedState &oState) const
  {
    return RawVstParamDef::writeToState(normalize(iValue), oState);
  }

  // getDefaultValue
  ParamType getDefaultValue() const { return fDefaultValue; }

  // shortcut to normalize
  inline ParamValue normalize(ParamType const &iValue) const
  {
    if(fConverter)
      return fConverter->normalize(iValue);
    return 0;
  }

  // shortcut to denormalize
  inline ParamType denormalize(ParamValue iNormalizedValue) const
  {
    if(fConverter)
      return fConverter->denormalize(iNormalizedValue);
    return fDefaultValue;
  }

  void toString(ParamValue iNormalizedValue, String128 iString) const override
  {
    if(fConverter)
      fConverter->toString(fConverter->denormalize(iNormalizedValue), iString, fPrecision);
    else
      RawVstParamDef::toString(iNormalizedValue, iString);
  }

  std::string toUTF8String(ParamValue iNormalizedValue, int32 iPrecision) const override
  {
    if(fConverter)
    {
      String128 s;
      s[0] = 0;
      fConverter->toString(fConverter->denormalize(iNormalizedValue), s, iPrecision >= 0 ? iPrecision : fPrecision);
      return VstUtils::toUT8String(s);
    }
    else
      return RawVstParamDef::toUTF8String(iNormalizedValue, iPrecision);
  }

public:
  const ParamType fDefaultValue;
  const std::shared_ptr<IParamConverter<ParamType>> fConverter;
};

class IJmbParamDef : public IParamDef
{
public:
  IJmbParamDef(const ParamID iParamID,
               VstString16 iTitle,
               Owner const iOwner,
               bool const iTransient,
               int16 const iDeprecatedSince,
               bool const iShared)
    : IParamDef(iParamID, std::move(iTitle), iOwner, iTransient, iDeprecatedSince),
      fShared{iShared}
  {}

  ~IJmbParamDef() override = default;

  // writeDefaultValue
  virtual void writeDefaultValue(std::ostream &oStreamer) const = 0;

  virtual std::shared_ptr<GUI::Params::IGUIJmbParameter> newGUIParam() = 0;

  virtual bool isSerializable() const = 0;

public:
  bool const fShared;
};

template<typename T>
class JmbParamDef : public IJmbParamDef, IParamSerializer<T>
{
public:
  using ParamType = T;

  JmbParamDef(ParamID const iParamID,
              VstString16 iTitle,
              Owner const iOwner,
              bool const iTransient,
              int16 const iDeprecatedSince,
              bool const iShared,
              ParamType const &iDefaultValue,
              std::shared_ptr<IParamSerializer<ParamType>> iSerializer) :
    IJmbParamDef(iParamID, std::move(iTitle), iOwner, iTransient, iDeprecatedSince, iShared),
    fDefaultValue{iDefaultValue},
    fSerializer{std::move(iSerializer)}
  {}

  // readFromStream
  tresult readFromStream(IBStreamer &iStreamer, ParamType &oValue) const override;
  ParamType readFromStream(IBStreamer &iStreamer) const;

  // writeToStream
  tresult writeToStream(ParamType const &iValue, IBStreamer &oStreamer) const override;

  // writeToStream
  void writeToStream(ParamType const &iValue, std::ostream &oStreamer) const override;

  // writeDefaultValue
  void writeDefaultValue(std::ostream &oStreamer) const override;

  // readFromMessage
  tresult readFromMessage(Message const &iMessage, ParamType &oValue) const;

  // writeToMessage
  tresult writeToMessage(ParamType const &iValue, Message &oMessage) const;

  std::string toUTF8String(ParamType const &iValue, int32 iPrecision) const
  {
    if(fSerializer)
      return fSerializer->toString(iValue, iPrecision);
    else
    {
      if constexpr(Utils::is_operator_write_to_ostream_defined<ParamType>)
      {
        std::ostringstream s;
        if(iPrecision >= 0)
        {
          s.precision(iPrecision);
          s.setf(std::ios::fixed);
        }
        s << iValue;
        return s.str();
      }
      else
        return "";
    }
  }

  std::shared_ptr<IDiscreteConverter<T>> getDiscreteConverter() const
  {
    // Implementation note: at this moment, only checks if the serializer also implements the API.
    // But possible to add an additional separate field to set it explicitly if there is a need
    return std::dynamic_pointer_cast<IDiscreteConverter<T>>(fSerializer);
  }

  // computeMessageAttrID
  std::string computeMessageAttrID() const
  {
    return "__param__" + std::to_string(fParamID);
  }

  std::shared_ptr<GUI::Params::IGUIJmbParameter> newGUIParam() override;

  bool isSerializable() const override { return fSerializer != nullptr; }

public:
  const ParamType fDefaultValue;
  const std::shared_ptr<IParamSerializer<ParamType>> fSerializer;
};

//------------------------------------------------------------------------
// JmbParamDef::readFromStream
//------------------------------------------------------------------------
template<typename T>
tresult JmbParamDef<T>::readFromStream(IBStreamer &iStreamer, T &oValue) const
{
  if(fSerializer)
  {
    return fSerializer->readFromStream(iStreamer, oValue);
  }
  else
    return kResultFalse;
}

//------------------------------------------------------------------------
// JmbParamDef::readFromStream
//------------------------------------------------------------------------
template<typename T>
T JmbParamDef<T>::readFromStream(IBStreamer &iStreamer) const
{
  T value;
  if(readFromStream(iStreamer, value) != kResultOk)
    value = fDefaultValue;
  return value;
}


//------------------------------------------------------------------------
// JmbParamDef::writeToStream
//------------------------------------------------------------------------
template<typename T>
tresult JmbParamDef<T>::writeToStream(const T &iValue, IBStreamer &oStreamer) const
{
  if(fSerializer)
    return fSerializer->writeToStream(iValue, oStreamer);
  else
    return kResultFalse;
}

//------------------------------------------------------------------------
// JmbParamDef::writeToStream
//------------------------------------------------------------------------
template<typename T>
void JmbParamDef<T>::writeToStream(const ParamType &iValue, std::ostream &oStream) const
{
  if(fSerializer)
    fSerializer->writeToStream(iValue, oStream);
  else
  {
    if constexpr(Utils::is_operator_write_to_ostream_defined<ParamType>)
    {
      oStream << iValue;
    }
  }
}

//------------------------------------------------------------------------
// JmbParamDef::writeDefaultValue
//------------------------------------------------------------------------
template<typename T>
void JmbParamDef<T>::writeDefaultValue(std::ostream &oStreamer) const
{
  writeToStream(fDefaultValue, oStreamer);
}

//------------------------------------------------------------------------
// JmbParamDef::readFromMessage
//------------------------------------------------------------------------
template<typename T>
tresult JmbParamDef<T>::readFromMessage(Message const &iMessage, ParamType &oValue) const
{
  if(fSerializer)
    return iMessage.getSerializableValue(computeMessageAttrID().c_str(), *this, oValue);
  else
    return kResultFalse;
}

//------------------------------------------------------------------------
// JmbParamDef::writeToMessage
//------------------------------------------------------------------------
template<typename T>
tresult JmbParamDef<T>::writeToMessage(const ParamType &iValue, Message &oMessage) const
{
  if(fSerializer)
    return oMessage.setSerializableValue(computeMessageAttrID().c_str(), *this, iValue);
  else
    return kResultFalse;
}

//------------------------------------------------------------------------
// VstParam - define shortcut notation
//------------------------------------------------------------------------
template<typename T>
using VstParam = std::shared_ptr<VstParamDef<T>>;
using RawVstParam = std::shared_ptr<RawVstParamDef>;

//------------------------------------------------------------------------
// JmbParam - define shortcut notation
//------------------------------------------------------------------------
template<typename T>
using JmbParam = std::shared_ptr<JmbParamDef<T>>;

}