/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * 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.
 */

#ifndef android_hardware_automotive_vehicle_V2_0_impl_VehicleHalEmulator_H_
#define android_hardware_automotive_vehicle_V2_0_impl_VehicleHalEmulator_H_

#include <log/log.h>
#include <memory>
#include <thread>
#include <vector>

#include <vhal_v2_0/VehicleHal.h>
#include <vhal_v2_0/VehicleServer.h>

#include "CommConn.h"
#include "PipeComm.h"
#include "SocketComm.h"
#include "VehicleHalProto.pb.h"

namespace android {
namespace hardware {
namespace automotive {
namespace vehicle {
namespace V2_0 {

namespace impl {

class VehicleEmulator;  // Forward declaration.

/** An interface used by VehicleEmulator. */
class EmulatedServerIface {
  public:
    using VehiclePropValuePtr = VehicleHal::VehiclePropValuePtr;
    virtual ~EmulatedServerIface() = default;
    virtual bool setPropertyFromVehicle(const VehiclePropValue& propValue) = 0;
    virtual std::vector<VehiclePropValue> getAllProperties() const = 0;
    virtual std::vector<VehiclePropConfig> listProperties() = 0;
    virtual VehiclePropValuePtr get(const VehiclePropValue& requestedPropValue,
                                    StatusCode* outStatus) = 0;
    virtual IVehicleServer::DumpResult debug(const std::vector<std::string>& options) = 0;

    void registerEmulator(VehicleEmulator* emulator) {
        ALOGI("%s, emulator: %p", __func__, emulator);
        std::lock_guard<std::mutex> g(mEmulatorLock);
        mEmulator = emulator;
    }

protected:
    VehicleEmulator* getEmulatorOrDie() {
        std::lock_guard<std::mutex> g(mEmulatorLock);
        if (mEmulator == nullptr) abort();
        return mEmulator;
    }

private:
    mutable std::mutex mEmulatorLock;
    VehicleEmulator* mEmulator;
};

/**
 * Emulates vehicle by providing controlling interface from host side either through ADB or Pipe.
 */
class VehicleEmulator : public MessageProcessor {
   public:
     VehicleEmulator(EmulatedServerIface* hal);
     virtual ~VehicleEmulator();

     void doSetValueFromClient(const VehiclePropValue& propValue);
     void processMessage(const vhal_proto::EmulatorMessage& rxMsg,
                         vhal_proto::EmulatorMessage* respMsg) override;

   private:
    friend class ConnectionThread;
    using EmulatorMessage = vhal_proto::EmulatorMessage;

    void doGetConfig(const EmulatorMessage& rxMsg, EmulatorMessage* respMsg);
    void doGetConfigAll(const EmulatorMessage& rxMsg, EmulatorMessage* respMsg);
    void doGetProperty(const EmulatorMessage& rxMsg, EmulatorMessage* respMsg);
    void doGetPropertyAll(const EmulatorMessage& rxMsg, EmulatorMessage* respMsg);
    void doSetProperty(const EmulatorMessage& rxMsg, EmulatorMessage* respMsg);
    void doDebug(const EmulatorMessage& rxMsg, EmulatorMessage* respMsg);
    void populateProtoVehicleConfig(vhal_proto::VehiclePropConfig* protoCfg,
                                    const VehiclePropConfig& cfg);
    void populateProtoVehiclePropValue(vhal_proto::VehiclePropValue* protoVal,
                                       const VehiclePropValue* val);

private:
  EmulatedServerIface* mHal;
  std::unique_ptr<SocketComm> mSocketComm;
  std::unique_ptr<PipeComm> mPipeComm;
};

// determine if it's running inside Android Emulator
bool isInQEMU();

}  // impl

}  // namespace V2_0
}  // namespace vehicle
}  // namespace automotive
}  // namespace hardware
}  // namespace android

#endif // android_hardware_automotive_vehicle_V2_0_impl_VehicleHalEmulator_H_