// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.

#ifndef __OPENCV_VIDEOIO_VIDEOIO_REGISTRY_HPP__
#define __OPENCV_VIDEOIO_VIDEOIO_REGISTRY_HPP__

#include "opencv2/videoio.hpp"
#include "opencv2/videoio/registry.hpp"
#include "backend.hpp"

namespace cv
{

/** Capabilities bitmask */
enum BackendMode {
    MODE_CAPTURE_BY_INDEX    = 1 << 0,           //!< device index
    MODE_CAPTURE_BY_FILENAME = 1 << 1,           //!< filename or device path (v4l2)
    MODE_WRITER              = 1 << 4,            //!< writer
    MODE_DYNAMIC             = 1 << 5,

    MODE_CAPTURE_ALL = MODE_CAPTURE_BY_INDEX + MODE_CAPTURE_BY_FILENAME,
};

struct VideoBackendInfo {
    VideoCaptureAPIs id;
    BackendMode mode;
    int priority;     // 1000-<index*10> - default builtin priority
                      // 0 - disabled (OPENCV_VIDEOIO_PRIORITY_<name> = 0)
                      // >10000 - prioritized list (OPENCV_VIDEOIO_PRIORITY_LIST)
    const char* name;
    Ptr<IBackend> backendFactory;
};

/** @brief Manages list of enabled backends
 */
class VideoBackendRegistry
{
public:
    typedef std::vector<VideoBackendInfo> BackendsVec;
protected:
    BackendsVec enabledBackends;
    VideoBackendRegistry();
public:
    std::string dumpBackends() const;
    Ptr<IBackend> getBackend(VideoCaptureAPIs api) const;
    BackendsVec getBackends(int capabilityMask, VideoCaptureAPIs filter = CAP_ANY) const;
    bool hasBackend(int mask, VideoCaptureAPIs api) const;

    static VideoBackendRegistry& getInstance();
};

} // namespace
#endif // __OPENCV_VIDEOIO_VIDEOIO_REGISTRY_HPP__