/*
 * Copyright (C) 2018 Metrological Group B.V.
 * Author: Thibault Saunier <tsaunier@igalia.com>
 * Author: Alejandro G. Castro <alex@igalia.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * aint with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#pragma once

#if ENABLE(MEDIA_STREAM) && USE(GSTREAMER)

#include "CaptureDeviceManager.h"
#include "GRefPtrGStreamer.h"
#include "GStreamerCaptureDevice.h"
#include "RealtimeMediaSourceFactory.h"

namespace WebCore {

class GStreamerCaptureDeviceManager : public CaptureDeviceManager {
public:
    ~GStreamerCaptureDeviceManager();
    std::optional<GStreamerCaptureDevice> gstreamerDeviceWithUID(const String&);

    const Vector<CaptureDevice>& captureDevices() final;
    virtual CaptureDevice::DeviceType deviceType() = 0;

private:
    void addDevice(GRefPtr<GstDevice>&&);
    void refreshCaptureDevices();

    GRefPtr<GstDeviceMonitor> m_deviceMonitor;
    Vector<GStreamerCaptureDevice> m_gstreamerDevices;
    Vector<CaptureDevice> m_devices;
};

class GStreamerAudioCaptureDeviceManager final : public GStreamerCaptureDeviceManager {
    friend class NeverDestroyed<GStreamerAudioCaptureDeviceManager>;
public:
    static GStreamerAudioCaptureDeviceManager& singleton();
    CaptureDevice::DeviceType deviceType() final { return CaptureDevice::DeviceType::Microphone; }
private:
    GStreamerAudioCaptureDeviceManager() = default;
};

class GStreamerVideoCaptureDeviceManager final : public GStreamerCaptureDeviceManager {
    friend class NeverDestroyed<GStreamerVideoCaptureDeviceManager>;
public:
    static GStreamerVideoCaptureDeviceManager& singleton();
    static VideoCaptureFactory& videoFactory();
    CaptureDevice::DeviceType deviceType() final { return CaptureDevice::DeviceType::Camera; }
private:
    GStreamerVideoCaptureDeviceManager() = default;
};

class GStreamerDisplayCaptureDeviceManager final : public CaptureDeviceManager {
    friend class NeverDestroyed<GStreamerDisplayCaptureDeviceManager>;
public:
    static GStreamerDisplayCaptureDeviceManager& singleton();
    const Vector<CaptureDevice>& captureDevices() final { return m_devices; };
    void computeCaptureDevices(CompletionHandler<void()>&&) final;
    CaptureSourceOrError createDisplayCaptureSource(const CaptureDevice&, String&&, const MediaConstraints*);

    enum PipeWireOutputType {
        Monitor = 1 << 0,
        Window = 1 << 1
    };

    void stopSource(const String& persistentID);

protected:
    void notifyResponse() { m_currentResponseCallback(); }

private:
    GStreamerDisplayCaptureDeviceManager();
    ~GStreamerDisplayCaptureDeviceManager();

    void waitResponseSignal(const char* objectPath);

    Vector<CaptureDevice> m_devices;

    struct Session {
        WTF_MAKE_STRUCT_FAST_ALLOCATED;
        WTF_MAKE_NONCOPYABLE(Session);
        Session(int fd, String&& path)
            : fd(fd)
            , path(WTFMove(path)) { }

        ~Session()
        {
            close(fd);
        }

        int fd;
        String path;
    };
    HashMap<String, std::unique_ptr<Session>> m_sessions;

    GRefPtr<GDBusProxy> m_proxy;
    CompletionHandler<void()> m_currentResponseCallback;
};
}

#endif // ENABLE(MEDIA_STREAM) && USE(GSTREAMER)