/*
 * Copyright (C) 2016 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_AUTOMOTIVE_EVS_V1_0_CAMERAPROXY_H
#define ANDROID_AUTOMOTIVE_EVS_V1_0_CAMERAPROXY_H

#include <android/hardware/evs/1.0/types.h>
#include <android/hardware/evs/1.0/IEvsCamera.h>
#include <ui/GraphicBuffer.h>

#include <thread>
#include <deque>


using namespace ::android::hardware::evs::V1_0;
using ::android::hardware::Return;
using ::android::hardware::Void;
using ::android::hardware::hidl_handle;

namespace android {
namespace automotive {
namespace evs {
namespace V1_0 {
namespace implementation {


// From HalCamera.h
class HalCamera;


// This class represents an EVS camera to the client application.  As such it presents
// the IEvsCamera interface, and also proxies the frame delivery to the client's
// IEvsCameraStream object.
class VirtualCamera : public IEvsCamera {
public:
    explicit VirtualCamera(sp<HalCamera> halCamera) : mHalCamera(halCamera) {};
    virtual ~VirtualCamera();
    void              shutdown();

    sp<HalCamera>     getHalCamera() { return mHalCamera; };
    unsigned          getAllowedBuffers() { return mFramesAllowed; };
    bool              isStreaming()  { return mStreamState == RUNNING; }

    // Proxy to receive frames and forward them to the client's stream
    bool              deliverFrame(const BufferDesc& buffer);

    // Methods from ::android::hardware::evs::V1_0::IEvsCamera follow.
    Return<void>      getId(getId_cb id_cb)  override;
    Return<EvsResult> setMaxFramesInFlight(uint32_t bufferCount)  override;
    Return<EvsResult> startVideoStream(const ::android::sp<IEvsCameraStream>& stream)  override;
    Return<void>      doneWithFrame(const BufferDesc& buffer)  override;
    Return<void>      stopVideoStream()  override;
    Return<int32_t>   getExtendedInfo(uint32_t opaqueIdentifier)  override;
    Return<EvsResult> setExtendedInfo(uint32_t opaqueIdentifier, int32_t opaqueValue)  override;

private:
    sp<HalCamera>           mHalCamera;
    sp<IEvsCameraStream>    mStream;

    std::deque<BufferDesc>  mFramesHeld;
    unsigned                mFramesAllowed  = 1;
    enum {
        STOPPED,
        RUNNING,
        STOPPING,
    }                       mStreamState    = STOPPED;
};

} // namespace implementation
} // namespace V1_0
} // namespace evs
} // namespace automotive
} // namespace android

#endif  // ANDROID_AUTOMOTIVE_EVS_V1_0_CAMERAPROXY_H