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

#include <deque>
#include <thread>

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

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

class HalCamera;  // From HalCamera.h

// 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);
    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::automotive::evs::V1_0::IEvsCamera follow.
    Return<void> getCameraInfo(getCameraInfo_cb _hidl_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;  // The low level camera interface that backs this proxy
    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