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#ifndef OSXBTCENTRALMANAGER_P_H
#define OSXBTCENTRALMANAGER_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "qlowenergycontroller.h"
#include "qlowenergyservice.h"
#include "osxbtgcdtimer_p.h"
#include "qbluetoothuuid.h"
#include "osxbtutility_p.h"
#include "osxbluetooth_p.h"

#include <QtCore/qbytearray.h>
#include <QtCore/qglobal.h>
#include <QtCore/qqueue.h>
#include <QtCore/qhash.h>

#include <Foundation/Foundation.h>

@class QT_MANGLE_NAMESPACE(OSXBTCentralManager);

QT_BEGIN_NAMESPACE

class QLowEnergyServicePrivate;

namespace OSXBluetooth {

class LECBManagerNotifier;

enum CentralManagerState
{
    // QLowEnergyController already has some of these states,
    // but it's not enough and we need more special states here.
    CentralManagerIdle,
    // Required by CBCentralManager to avoid problems with dangled pointers.
    CentralManagerUpdating,
    CentralManagerConnecting,
    CentralManagerDiscovering,
    CentralManagerDisconnecting
};

enum class OperationTimeout
{
    none,
    serviceDiscovery,
    includedServicesDiscovery,
    characteristicsDiscovery,
    characteristicRead,
    descriptorsDiscovery,
    descriptorRead,
    characteristicWrite
};

// In Qt we work with handles and UUIDs. Core Bluetooth
// has NSArrays (and nested NSArrays inside servces/characteristics).
// To simplify a navigation, I need a simple way to map from a handle
// to a Core Bluetooth object. These are weak pointers,
// will probably require '__weak' with ARC.
typedef QHash<QLowEnergyHandle, CBService *> ServiceHash;
typedef QHash<QLowEnergyHandle, CBCharacteristic *> CharHash;
typedef QHash<QLowEnergyHandle, CBDescriptor *> DescHash;

// Descriptor/charactesirstic read/write requests
// - we have to serialize 'concurrent' requests.
struct LERequest {
    enum RequestType {
        CharRead,
        CharWrite,
        DescRead,
        DescWrite,
        ClientConfiguration,
        Invalid
    };

    LERequest() : type(Invalid),
                  withResponse(false),
                  handle(0)
    {}

    RequestType type;
    bool withResponse;
    QLowEnergyHandle handle;
    QByteArray value;
};

typedef QQueue<LERequest> RequestQueue;

// Core Bluetooth's write confirmation does not provide
// the updated value (characteristic or descriptor).
// But the Qt's Bluetooth API ('write with response')
// expects this updated value as a response, so we have
// to cache this write value and report it back.
// 'NSObject *' will require '__weak' with ARC.
typedef QHash<NSObject *, QByteArray> ValueHash;

}

QT_END_NAMESPACE

@interface QT_MANGLE_NAMESPACE(OSXBTCentralManager) : NSObject<CBCentralManagerDelegate,
                                                               CBPeripheralDelegate,
                                                               QT_MANGLE_NAMESPACE(GCDTimerDelegate)>
{
@private
    CBCentralManager *manager;
    QT_PREPEND_NAMESPACE(OSXBluetooth)::CentralManagerState managerState;
    bool disconnectPending;

    QT_PREPEND_NAMESPACE(QBluetoothUuid) deviceUuid;

    QT_PREPEND_NAMESPACE(OSXBluetooth)::LECBManagerNotifier *notifier;

    // Quite a verbose service discovery machinery
    // (a "graph traversal").
    QT_PREPEND_NAMESPACE(OSXBluetooth)::ObjCStrongReference<NSMutableArray> servicesToVisit;
    // The service we're discovering now (included services discovery):
    NSUInteger currentService;
    // Included services, we'll iterate through at the end of 'servicesToVisit':
    QT_PREPEND_NAMESPACE(OSXBluetooth)::ObjCStrongReference<NSMutableArray> servicesToVisitNext;
    // We'd like to avoid loops in a services' topology:
    QT_PREPEND_NAMESPACE(OSXBluetooth)::ObjCStrongReference<NSMutableSet> visitedServices;

    QT_PREPEND_NAMESPACE(QList)<QT_PREPEND_NAMESPACE(QBluetoothUuid)> servicesToDiscoverDetails;

    QT_PREPEND_NAMESPACE(OSXBluetooth)::ServiceHash serviceMap;
    QT_PREPEND_NAMESPACE(OSXBluetooth)::CharHash charMap;
    QT_PREPEND_NAMESPACE(OSXBluetooth)::DescHash descMap;

    QT_PREPEND_NAMESPACE(QLowEnergyHandle) lastValidHandle;

    bool requestPending;
    QT_PREPEND_NAMESPACE(OSXBluetooth)::RequestQueue requests;
    QT_PREPEND_NAMESPACE(QLowEnergyHandle) currentReadHandle;

    QT_PREPEND_NAMESPACE(OSXBluetooth)::ValueHash valuesToWrite;

    qint64 timeoutMS;
    id objectUnderWatch;
    QT_PREPEND_NAMESPACE(OSXBluetooth)::OperationTimeout timeoutType;
    QT_PREPEND_NAMESPACE(OSXBluetooth)::GCDTimer timeoutWatchdog;

@public
    CBPeripheral *peripheral;
}

- (id)initWith:(QT_PREPEND_NAMESPACE(OSXBluetooth)::LECBManagerNotifier *)notifier;
- (void)dealloc;

// IMPORTANT: _all_ these methods are to be executed on qt_LE_queue,
// when passing parameters - C++ objects _must_ be copied (see the controller's code).
- (void)connectToDevice:(const QT_PREPEND_NAMESPACE(QBluetoothUuid) &)aDeviceUuid;

- (void)disconnectFromDevice;

- (void)discoverServices;
- (void)discoverServiceDetails:(const QT_PREPEND_NAMESPACE(QBluetoothUuid) &)serviceUuid;

- (void)setNotifyValue:(const QT_PREPEND_NAMESPACE(QByteArray) &)value
        forCharacteristic:(QT_PREPEND_NAMESPACE(QLowEnergyHandle))charHandle
        onService:(const QT_PREPEND_NAMESPACE(QBluetoothUuid) &)serviceUuid;

- (void)readCharacteristic:(QT_PREPEND_NAMESPACE(QLowEnergyHandle))charHandle
        onService:(const QT_PREPEND_NAMESPACE(QBluetoothUuid) &)serviceUuid;

- (void)write:(const QT_PREPEND_NAMESPACE(QByteArray) &)value
        charHandle:(QT_PREPEND_NAMESPACE(QLowEnergyHandle))charHandle
        onService:(const QT_PREPEND_NAMESPACE(QBluetoothUuid) &)serviceUuid
        withResponse:(bool)writeWithResponse;

- (void)readDescriptor:(QT_PREPEND_NAMESPACE(QLowEnergyHandle))descHandle
        onService:(const QT_PREPEND_NAMESPACE(QBluetoothUuid) &)serviceUuid;

- (void)write:(const QT_PREPEND_NAMESPACE(QByteArray) &)value
        descHandle:(QT_PREPEND_NAMESPACE(QLowEnergyHandle))descHandle
        onService:(const QT_PREPEND_NAMESPACE(QBluetoothUuid) &)serviceUuid;

- (void)detach;

@end

#endif
