/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

#pragma once

#ifndef GEODE_SERIALIZATIONREGISTRY_H_
#define GEODE_SERIALIZATIONREGISTRY_H_

#include <functional>
#include <iostream>
#include <memory>
#include <mutex>
#include <string>
#include <typeindex>
#include <typeinfo>
#include <unordered_map>

#include <geode/DataOutput.hpp>
#include <geode/DataSerializable.hpp>
#include <geode/Delta.hpp>
#include <geode/ExceptionTypes.hpp>
#include <geode/PdxSerializable.hpp>
#include <geode/PdxSerializer.hpp>
#include <geode/Serializable.hpp>
#include <geode/internal/DataSerializableInternal.hpp>
#include <geode/internal/DataSerializablePrimitive.hpp>
#include <geode/internal/geode_globals.hpp>

#include "MemberListForVersionStamp.hpp"
#include "config.h"

namespace std {

template <>
struct hash<apache::geode::client::internal::DSCode>
    : public std::unary_function<apache::geode::client::internal::DSCode,
                                 size_t> {
  size_t operator()(apache::geode::client::internal::DSCode val) const {
    return std::hash<int32_t>{}(static_cast<int32_t>(val));
  }
};

template <>
struct hash<apache::geode::client::internal::DSFid>
    : public std::unary_function<apache::geode::client::internal::DSFid,
                                 size_t> {
  size_t operator()(apache::geode::client::internal::DSFid val) const {
    return std::hash<int32_t>{}(static_cast<int32_t>(val));
  }
};

}  // namespace std

namespace apache {
namespace geode {
namespace client {

using internal::DataSerializableInternal;
using internal::DataSerializablePrimitive;

class TheTypeMap {
  std::unordered_map<internal::DSCode, TypeFactoryMethod>
      dataSerializablePrimitiveMap_;
  std::unordered_map<int32_t, TypeFactoryMethod> dataSerializableMap_;
  std::unordered_map<internal::DSFid, TypeFactoryMethod>
      dataSerializableFixedIdMap_;
  std::unordered_map<std::string, TypeFactoryMethodPdx> pdxSerializableMap_;
  mutable std::mutex dataSerializablePrimitiveMapMutex_;
  mutable std::mutex dataSerializableMapMutex_;
  mutable std::mutex dataSerializableFixedIdMapMutex_;
  mutable std::mutex pdxSerializableMapMutex_;

 public:
  std::unordered_map<std::type_index, int32_t> typeToClassId_;

  TheTypeMap(const TheTypeMap&) = delete;
  TheTypeMap() { setup(); }

  ~TheTypeMap() noexcept = default;

  void setup();

  void clear();

  void findDataSerializable(int32_t id, TypeFactoryMethod& func) const;

  void bindDataSerializable(TypeFactoryMethod func, int32_t id);

  void rebindDataSerializable(int32_t id, TypeFactoryMethod func);

  void unbindDataSerializable(int32_t id);

  void findDataSerializableFixedId(internal::DSFid id,
                                   TypeFactoryMethod& func) const;

  void bindDataSerializableFixedId(TypeFactoryMethod func);

  void rebindDataSerializableFixedId(internal::DSFid id,
                                     TypeFactoryMethod func);

  void unbindDataSerializableFixedId(internal::DSFid id);

  void bindPdxSerializable(TypeFactoryMethodPdx func);

  TypeFactoryMethodPdx findPdxSerializable(
      const std::string& objFullName) const;

  void unbindPdxSerializable(const std::string& objFullName);

  void rebindPdxSerializable(std::string objFullName,
                             TypeFactoryMethodPdx func);

  void findDataSerializablePrimitive(DSCode dsCode,
                                     TypeFactoryMethod& func) const;

  void bindDataSerializablePrimitive(TypeFactoryMethod func, DSCode id);

  void rebindDataSerializablePrimitive(DSCode dsCode, TypeFactoryMethod func);

 private:
};

class Pool;

/**
 * Used to register handlers for the PDX DsCode. .NET client extends this to
 * intercept PDX (de)serialization.
 */
class PdxTypeHandler {
 public:
  virtual ~PdxTypeHandler() noexcept = default;
  virtual void serialize(
      const std::shared_ptr<PdxSerializable>& pdxSerializable,
      DataOutput& dataOutput) const;
  virtual std::shared_ptr<PdxSerializable> deserialize(
      DataInput& dataInput) const;
};

/**
 * Used to register handlers for the DataSerializable. .NET client extends this
 * to intercept for (de)serialization.
 */
class DataSerializableHandler {
 public:
  virtual ~DataSerializableHandler() noexcept = default;
  virtual void serialize(
      const std::shared_ptr<DataSerializable>& dataSerializable,
      DataOutput& dataOutput, bool isDelta) const;
  virtual std::shared_ptr<DataSerializable> deserialize(DataInput& input,
                                                        DSCode typeId) const;
};

class APACHE_GEODE_EXPORT SerializationRegistry {
 public:
  SerializationRegistry() : theTypeMap_() {}

  /** write the length of the serialization, write the typeId of the object,
   * then write whatever the object's toData requires. The length at the
   * front is backfilled after the serialization.
   */
  inline void serialize(const std::shared_ptr<Serializable>& obj,
                        DataOutput& output, bool isDelta = false) const {
    if (obj == nullptr) {
      output.write(static_cast<int8_t>(DSCode::NullObj));
    } else if (auto&& pdxSerializable =
                   std::dynamic_pointer_cast<PdxSerializable>(obj)) {
      serialize(pdxSerializable, output);
    } else if (const auto&& dataSerializableFixedId =
                   std::dynamic_pointer_cast<DataSerializableFixedId>(obj)) {
      serialize(dataSerializableFixedId, output);
    } else if (const auto&& dataSerializablePrimitive =
                   std::dynamic_pointer_cast<DataSerializablePrimitive>(obj)) {
      serialize(dataSerializablePrimitive, output);
    } else if (const auto&& dataSerializable =
                   std::dynamic_pointer_cast<DataSerializable>(obj)) {
      dataSerializableHandler_->serialize(dataSerializable, output, isDelta);
    } else if (const auto&& dataSerializableInternal =
                   std::dynamic_pointer_cast<DataSerializableInternal>(obj)) {
      serialize(dataSerializableInternal, output);
    } else {
      throw UnsupportedOperationException(
          "SerializationRegistry::serialize: Serialization type not "
          "implemented.");
    }
  }

  inline void serializeWithoutHeader(const std::shared_ptr<Serializable>& obj,
                                     DataOutput& output) const {
    if (const auto&& pdxSerializable =
            std::dynamic_pointer_cast<PdxSerializable>(obj)) {
      serializeWithoutHeader(pdxSerializable, output);
    } else if (const auto&& dataSerializableFixedId =
                   std::dynamic_pointer_cast<DataSerializableFixedId>(obj)) {
      serializeWithoutHeader(dataSerializableFixedId, output);
    } else if (const auto&& dataSerializablePrimitive =
                   std::dynamic_pointer_cast<DataSerializablePrimitive>(obj)) {
      serializeWithoutHeader(dataSerializablePrimitive, output);
    } else if (const auto&& dataSerializable =
                   std::dynamic_pointer_cast<DataSerializable>(obj)) {
      serializeWithoutHeader(dataSerializable, output);
    } else if (const auto&& dataSerializableInternal =
                   std::dynamic_pointer_cast<DataSerializableInternal>(obj)) {
      serializeWithoutHeader(dataSerializableInternal, output);
    } else {
      throw UnsupportedOperationException(
          "SerializationRegistry::serializeWithoutHeader: Serialization type "
          "not implemented.");
    }
  }

  /**
   * Read the length, typeid, and run the objs fromData. Returns the New
   * object.
   */
  std::shared_ptr<Serializable> deserialize(DataInput& input,
                                            int8_t typeId = -1) const;

  void addDataSerializableType(TypeFactoryMethod func, int32_t id);

  void addPdxSerializableType(TypeFactoryMethodPdx func);

  void setPdxSerializer(std::shared_ptr<PdxSerializer> pdxSerializer);

  std::shared_ptr<PdxSerializer> getPdxSerializer();

  void removeDataSerializableType(int32_t id);

  void addDataSerializableFixedIdType(TypeFactoryMethod func);

  void addDataSerializableFixedIdType(internal::DSFid id,
                                      TypeFactoryMethod func);

  void removeDataSerializableFixeIdType(internal::DSFid id);

  void setDataSerializablePrimitiveType(TypeFactoryMethod func, DSCode dsCode);

  int32_t GetPDXIdForType(Pool* pool,
                          std::shared_ptr<Serializable> pdxType) const;

  std::shared_ptr<Serializable> GetPDXTypeById(Pool* pool,
                                               int32_t typeId) const;

  int32_t GetEnumValue(std::shared_ptr<Pool> pool,
                       std::shared_ptr<Serializable> enumInfo) const;

  std::shared_ptr<Serializable> GetEnum(std::shared_ptr<Pool> pool,
                                        int32_t val) const;

  std::shared_ptr<PdxSerializable> getPdxSerializableType(
      const std::string& className) const;

  void setPdxTypeHandler(PdxTypeHandler* handler) {
    this->pdxTypeHandler_ = std::unique_ptr<PdxTypeHandler>(handler);
  }
  void setDataSerializableHandler(DataSerializableHandler* handler) {
    this->dataSerializableHandler_ =
        std::unique_ptr<DataSerializableHandler>(handler);
  }

  TypeFactoryMethod getDataSerializableCreationMethod(int32_t objectId) {
    TypeFactoryMethod createType;
    theTypeMap_.findDataSerializable(objectId, createType);
    return createType;
  }

  int32_t getIdForDataSerializableType(std::type_index objectType) const {
    auto&& typeIterator = theTypeMap_.typeToClassId_.find(objectType);
    auto&& id = typeIterator->second;
    return id;
  }

 private:
  std::unique_ptr<PdxTypeHandler> pdxTypeHandler_;
  std::shared_ptr<PdxSerializer> pdxSerializer_;
  std::unique_ptr<DataSerializableHandler> dataSerializableHandler_;
  TheTypeMap theTypeMap_;

  std::shared_ptr<Serializable> deserializeDataSerializableFixedId(
      DataInput& input, DSCode dsCode) const;

  inline void serialize(const std::shared_ptr<DataSerializableFixedId>& obj,
                        DataOutput& output) const {
    auto id = static_cast<int32_t>(obj->getDSFID());
    if (id <= std::numeric_limits<int8_t>::max() &&
        id >= std::numeric_limits<int8_t>::min()) {
      output.write(static_cast<int8_t>(DSCode::FixedIDByte));
      output.write(static_cast<int8_t>(id));
    } else if (id <= std::numeric_limits<int16_t>::max() &&
               id >= std::numeric_limits<int16_t>::min()) {
      output.write(static_cast<int8_t>(DSCode::FixedIDShort));
      output.writeInt(static_cast<int16_t>(id));
    } else {
      output.write(static_cast<int8_t>(DSCode::FixedIDInt));
      output.writeInt(static_cast<int32_t>(id));
    }

    serializeWithoutHeader(obj, output);
  }

  inline void serializeWithoutHeader(
      const std::shared_ptr<DataSerializableFixedId>& obj,
      DataOutput& output) const {
    obj->toData(output);
  }

  inline void serialize(const std::shared_ptr<DataSerializablePrimitive>& obj,
                        DataOutput& output) const {
    auto id = obj->getDsCode();
    output.write(static_cast<int8_t>(id));

    serializeWithoutHeader(obj, output);
  }

  inline void serializeWithoutHeader(
      const std::shared_ptr<DataSerializablePrimitive>& obj,
      DataOutput& output) const {
    obj->toData(output);
  }

  inline void serialize(const std::shared_ptr<PdxSerializable>& obj,
                        DataOutput& output) const {
    output.write(static_cast<int8_t>(DSCode::PDX));
    serializeWithoutHeader(obj, output);
  }

  void serializeWithoutHeader(const std::shared_ptr<PdxSerializable>& obj,
                              DataOutput& output) const;

  inline void serialize(const std::shared_ptr<DataSerializableInternal>& obj,
                        DataOutput& output) const {
    serializeWithoutHeader(obj, output);
  }

  inline void serializeWithoutHeader(
      const std::shared_ptr<DataSerializableInternal>& obj,
      DataOutput& output) const {
    obj->toData(output);
  }

 public:
  static inline DSCode getSerializableDataDsCode(int32_t classId) {
    if (classId <= std::numeric_limits<int8_t>::max() &&
        classId >= std::numeric_limits<int8_t>::min()) {
      return DSCode::CacheableUserData;
    } else if (classId <= std::numeric_limits<int16_t>::max() &&
               classId >= std::numeric_limits<int16_t>::min()) {
      return DSCode::CacheableUserData2;
    } else {
      return DSCode::CacheableUserData4;
    }
  }

 private:
  void deserialize(DataInput& input,
                   const std::shared_ptr<Serializable>& obj) const;
};

}  // namespace client
}  // namespace geode
}  // namespace apache

#endif  // GEODE_SERIALIZATIONREGISTRY_H_