// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#include "btconnectionmonitor_p.h"
#include "btutility_p.h"

#include "qbluetoothaddress.h"

#include <QtCore/qdebug.h>

QT_USE_NAMESPACE

@implementation DarwinBTConnectionMonitor
{
    QT_PREPEND_NAMESPACE(DarwinBluetooth::ConnectionMonitor) *monitor;
    IOBluetoothUserNotification *discoveryNotification;
    NSMutableArray *foundConnections;
}

- (id)initWithMonitor:(DarwinBluetooth::ConnectionMonitor *)aMonitor
{
    Q_ASSERT_X(aMonitor, "-initWithMonitor:", "invalid monitor (null)");

    if (self = [super init]) {
        monitor = aMonitor;
        discoveryNotification = [[IOBluetoothDevice registerForConnectNotifications:self
                                  selector:@selector(connectionNotification:withDevice:)] retain];
        foundConnections = [[NSMutableArray alloc] init];
    }

    return self;
}

- (void)dealloc
{
    Q_ASSERT_X(!monitor, "-dealloc",
               "Connection monitor was not stopped, calling -stopMonitoring is required");
    [super dealloc];
}

- (void)connectionNotification:(IOBluetoothUserNotification *)aNotification
        withDevice:(IOBluetoothDevice *)device
{
    Q_UNUSED(aNotification);

    typedef IOBluetoothUserNotification Notification;

    if (!device)
        return;

    if (!monitor) {
        // Rather surprising: monitor == nullptr means we stopped monitoring.
        // So apparently this thingie is still alive and keeps receiving
        // notifications.
        qCWarning(QT_BT_DARWIN,
                  "Connection notification received in a monitor that was cancelled");
        return;
    }

    QT_BT_MAC_AUTORELEASEPOOL;

    // All Obj-C objects are autoreleased.

    const QBluetoothAddress deviceAddress(DarwinBluetooth::qt_address([device getAddress]));
    if (deviceAddress.isNull())
        return;

    if (foundConnections) {
        Notification *const notification = [device registerForDisconnectNotification:self
                                            selector: @selector(connectionClosedNotification:withDevice:)];
        if (notification)
            [foundConnections addObject:notification];
    }

    Q_ASSERT_X(monitor, "-connectionNotification:withDevice:", "invalid monitor (null)");
    monitor->deviceConnected(deviceAddress);
}

- (void)connectionClosedNotification:(IOBluetoothUserNotification *)notification
        withDevice:(IOBluetoothDevice *)device
{
    QT_BT_MAC_AUTORELEASEPOOL;

    [notification unregister];//?
    [foundConnections removeObject:notification];

    const QBluetoothAddress deviceAddress(DarwinBluetooth::qt_address([device getAddress]));
    if (deviceAddress.isNull())
        return;

    Q_ASSERT_X(monitor, "-connectionClosedNotification:withDevice:", "invalid monitor (null)");
    monitor->deviceDisconnected(deviceAddress);
}

-(void)stopMonitoring
{
    monitor = nullptr;
    [discoveryNotification unregister];
    [discoveryNotification release];
    discoveryNotification = nil;

    for (IOBluetoothUserNotification *n in foundConnections)
        [n unregister];

    [foundConnections release];
    foundConnections = nil;
}

@end