/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"

/* This is the iOS implementation of the SDL joystick API */
#include "SDL_events.h"
#include "SDL_joystick.h"
#include "SDL_hints.h"
#include "SDL_stdinc.h"
#include "../SDL_sysjoystick.h"
#include "../SDL_joystick_c.h"
#include "../hidapi/SDL_hidapijoystick_c.h"
#include "../usb_ids.h"

#include "SDL_mfijoystick_c.h"

#if !SDL_EVENTS_DISABLED
#include "../../events/SDL_events_c.h"
#endif

#if TARGET_OS_IOS
#define SDL_JOYSTICK_iOS_ACCELEROMETER
#import <CoreMotion/CoreMotion.h>
#endif

#if defined(__MACOSX__)
#include <IOKit/hid/IOHIDManager.h>
#include <AppKit/NSApplication.h>
#ifndef NSAppKitVersionNumber10_15
#define NSAppKitVersionNumber10_15 1894
#endif
#endif /* __MACOSX__ */

#ifdef SDL_JOYSTICK_MFI
#import <GameController/GameController.h>

static id connectObserver = nil;
static id disconnectObserver = nil;
static NSString *GCInputXboxShareButton = @"Button Share";

#include <Availability.h>
#include <objc/message.h>

/* remove compilation warnings for strict builds by defining these selectors, even though
 * they are only ever used indirectly through objc_msgSend
 */
@interface GCController (SDL)
#if defined(__MACOSX__) && (__MAC_OS_X_VERSION_MAX_ALLOWED <= 101600)
+ (BOOL)supportsHIDDevice:(IOHIDDeviceRef)device;
#endif
#if !((__IPHONE_OS_VERSION_MAX_ALLOWED >= 130000) || (__APPLETV_OS_VERSION_MAX_ALLOWED >= 130000) || (__MAC_OS_VERSION_MAX_ALLOWED >= 1500000))
@property(nonatomic, readonly) NSString *productCategory;
#endif
#if !((__IPHONE_OS_VERSION_MAX_ALLOWED >= 140500) || (__APPLETV_OS_VERSION_MAX_ALLOWED >= 140500) || (__MAC_OS_X_VERSION_MAX_ALLOWED >= 110300))
@property(class, nonatomic, readwrite) BOOL shouldMonitorBackgroundEvents;
#endif
@end
@interface GCExtendedGamepad (SDL)
#if !((__IPHONE_OS_VERSION_MAX_ALLOWED >= 121000) || (__APPLETV_OS_VERSION_MAX_ALLOWED >= 121000) || (__MAC_OS_VERSION_MAX_ALLOWED >= 1401000))
@property (nonatomic, readonly, nullable) GCControllerButtonInput *leftThumbstickButton;
@property (nonatomic, readonly, nullable) GCControllerButtonInput *rightThumbstickButton;
#endif
#if !((__IPHONE_OS_VERSION_MAX_ALLOWED >= 130000) || (__APPLETV_OS_VERSION_MAX_ALLOWED >= 130000) || (__MAC_OS_VERSION_MAX_ALLOWED >= 1500000))
@property (nonatomic, readonly) GCControllerButtonInput *buttonMenu;
@property (nonatomic, readonly, nullable) GCControllerButtonInput *buttonOptions;
#endif
#if !((__IPHONE_OS_VERSION_MAX_ALLOWED >= 140000) || (__APPLETV_OS_VERSION_MAX_ALLOWED >= 140000) || (__MAC_OS_VERSION_MAX_ALLOWED > 1500000))
@property (nonatomic, readonly, nullable) GCControllerButtonInput *buttonHome;
#endif
@end
@interface GCMicroGamepad (SDL)
#if !((__IPHONE_OS_VERSION_MAX_ALLOWED >= 130000) || (__APPLETV_OS_VERSION_MAX_ALLOWED >= 130000) || (__MAC_OS_VERSION_MAX_ALLOWED >= 1500000))
@property (nonatomic, readonly) GCControllerButtonInput *buttonMenu;
#endif
@end

#if (__IPHONE_OS_VERSION_MAX_ALLOWED >= 140000) || (__APPLETV_OS_VERSION_MAX_ALLOWED >= 140000) || (__MAC_OS_VERSION_MAX_ALLOWED > 1500000) || (__MAC_OS_X_VERSION_MAX_ALLOWED > 101600)
#define ENABLE_MFI_BATTERY
#define ENABLE_MFI_RUMBLE
#define ENABLE_MFI_LIGHT
#define ENABLE_MFI_SENSORS
#define ENABLE_MFI_SYSTEM_GESTURE_STATE
#define ENABLE_PHYSICAL_INPUT_PROFILE
#endif

#ifdef ENABLE_MFI_RUMBLE
#import <CoreHaptics/CoreHaptics.h>
#endif

#endif /* SDL_JOYSTICK_MFI */

#ifdef SDL_JOYSTICK_iOS_ACCELEROMETER
static const char *accelerometerName = "iOS Accelerometer";
static CMMotionManager *motionManager = nil;
#endif /* SDL_JOYSTICK_iOS_ACCELEROMETER */

static SDL_JoystickDeviceItem *deviceList = NULL;

static int numjoysticks = 0;
int SDL_AppleTVRemoteOpenedAsJoystick = 0;

static SDL_JoystickDeviceItem *
GetDeviceForIndex(int device_index)
{
    SDL_JoystickDeviceItem *device = deviceList;
    int i = 0;

    while (i < device_index) {
        if (device == NULL) {
            return NULL;
        }
        device = device->next;
        i++;
    }

    return device;
}

#ifdef SDL_JOYSTICK_MFI
static BOOL
IsControllerPS4(GCController *controller)
{
    if (@available(macOS 10.15, iOS 13.0, tvOS 13.0, *)) {
        if ([controller.productCategory isEqualToString:@"DualShock 4"]) {
            return TRUE;
        }
    } else {
        if ([controller.vendorName containsString: @"DUALSHOCK"]) {
            return TRUE;
        }
    }
    return FALSE;
}
static BOOL
IsControllerPS5(GCController *controller)
{
    if (@available(macOS 10.15, iOS 13.0, tvOS 13.0, *)) {
        if ([controller.productCategory isEqualToString:@"DualSense"]) {
            return TRUE;
        }
    } else {
        if ([controller.vendorName containsString: @"DualSense"]) {
            return TRUE;
        }
    }
    return FALSE;
}
static BOOL
IsControllerXbox(GCController *controller)
{
    if (@available(macOS 10.15, iOS 13.0, tvOS 13.0, *)) {
        if ([controller.productCategory isEqualToString:@"Xbox One"]) {
            return TRUE;
        }
    } else {
        if ([controller.vendorName containsString: @"Xbox"]) {
            return TRUE;
        }
    }
    return FALSE;
}
static BOOL
IsControllerSwitchPro(GCController *controller)
{
    if (@available(macOS 10.15, iOS 13.0, tvOS 13.0, *)) {
        if ([controller.productCategory isEqualToString:@"Switch Pro Controller"]) {
            return TRUE;
        }
    }
    return FALSE;
}
static BOOL
IsControllerSwitchJoyConL(GCController *controller)
{
    if (@available(macOS 10.15, iOS 13.0, tvOS 13.0, *)) {
        if ([controller.productCategory isEqualToString:@"Nintendo Switch Joy-Con (L)"]) {
            return TRUE;
        }
    }
    return FALSE;
}
static BOOL
IsControllerSwitchJoyConR(GCController *controller)
{
    if (@available(macOS 10.15, iOS 13.0, tvOS 13.0, *)) {
        if ([controller.productCategory isEqualToString:@"Nintendo Switch Joy-Con (R)"]) {
            return TRUE;
        }
    }
    return FALSE;
}
static BOOL
IsControllerSwitchJoyConPair(GCController *controller)
{
    if (@available(macOS 10.15, iOS 13.0, tvOS 13.0, *)) {
        if ([controller.productCategory isEqualToString:@"Nintendo Switch Joy-Con (L/R)"]) {
            return TRUE;
        }
    }
    return FALSE;
}
static BOOL
IOS_AddMFIJoystickDevice(SDL_JoystickDeviceItem *device, GCController *controller)
{
    Uint16 vendor = 0;
    Uint16 product = 0;
    Uint8 subtype = 0;
    const char *name = NULL;

    if (@available(macOS 11.3, iOS 14.5, tvOS 14.5, *)) {
        if (!GCController.shouldMonitorBackgroundEvents) {
            GCController.shouldMonitorBackgroundEvents = YES;
        }
    }

    /* Explicitly retain the controller because SDL_JoystickDeviceItem is a
     * struct, and ARC doesn't work with structs. */
    device->controller = (__bridge GCController *) CFBridgingRetain(controller);

    if (controller.vendorName) {
        name = controller.vendorName.UTF8String;
    }

    if (!name) {
        name = "MFi Gamepad";
    }

    device->name = SDL_CreateJoystickName(0, 0, NULL, name);

#ifdef DEBUG_CONTROLLER_PROFILE
    if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
        if (controller.physicalInputProfile) {
            for (id key in controller.physicalInputProfile.buttons) {
                NSLog(@"Button %@ available\n", key);
            }
            for (id key in controller.physicalInputProfile.axes) {
                NSLog(@"Axis %@ available\n", key);
            }
        }
    }
#endif

    if (controller.extendedGamepad) {
        GCExtendedGamepad *gamepad = controller.extendedGamepad;
        BOOL is_xbox = IsControllerXbox(controller);
        BOOL is_ps4 = IsControllerPS4(controller);
        BOOL is_ps5 = IsControllerPS5(controller);
        BOOL is_switch_pro = IsControllerSwitchPro(controller);
        BOOL is_switch_joycon_pair = IsControllerSwitchJoyConPair(controller);
        int nbuttons = 0;
        BOOL has_direct_menu;

#ifdef SDL_JOYSTICK_HIDAPI
        if ((is_xbox && HIDAPI_IsDeviceTypePresent(SDL_CONTROLLER_TYPE_XBOXONE)) ||
            (is_ps4 && HIDAPI_IsDeviceTypePresent(SDL_CONTROLLER_TYPE_PS4)) ||
            (is_ps5 && HIDAPI_IsDeviceTypePresent(SDL_CONTROLLER_TYPE_PS5)) ||
            (is_switch_pro && HIDAPI_IsDeviceTypePresent(SDL_CONTROLLER_TYPE_NINTENDO_SWITCH_PRO))) {
            /* The HIDAPI driver is taking care of this device */
            return FALSE;
        }
#endif

        /* These buttons are part of the original MFi spec */
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_A);
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_B);
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_X);
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_Y);
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_LEFTSHOULDER);
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_RIGHTSHOULDER);
        nbuttons += 6;

        /* These buttons are available on some newer controllers */
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunguarded-availability-new"
        if ([gamepad respondsToSelector:@selector(leftThumbstickButton)] && gamepad.leftThumbstickButton) {
            device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_LEFTSTICK);
            ++nbuttons;
        }
        if ([gamepad respondsToSelector:@selector(rightThumbstickButton)] && gamepad.rightThumbstickButton) {
            device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_RIGHTSTICK);
            ++nbuttons;
        }
        if ([gamepad respondsToSelector:@selector(buttonOptions)] && gamepad.buttonOptions) {
            device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_BACK);
            ++nbuttons;
        }
        /* The Nintendo Switch JoyCon home button doesn't ever show as being held down */
        if ([gamepad respondsToSelector:@selector(buttonHome)] && gamepad.buttonHome && !is_switch_joycon_pair) {
            device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_GUIDE);
            ++nbuttons;
        }
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_START);
        ++nbuttons;

        has_direct_menu = [gamepad respondsToSelector:@selector(buttonMenu)] && gamepad.buttonMenu;
        if (!has_direct_menu) {
            device->uses_pause_handler = SDL_TRUE;
        }
#if TARGET_OS_TV
        /* The single menu button isn't very reliable, at least as of tvOS 16.1 */
        if ((device->button_mask & (1 << SDL_CONTROLLER_BUTTON_BACK)) == 0) {
            device->uses_pause_handler = SDL_TRUE;
        }
#endif

#ifdef ENABLE_PHYSICAL_INPUT_PROFILE
        if ([controller respondsToSelector:@selector(physicalInputProfile)]) {
            if (controller.physicalInputProfile.buttons[GCInputDualShockTouchpadButton] != nil) {
                device->has_dualshock_touchpad = SDL_TRUE;
                device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_MISC1);
                ++nbuttons;
            }
            if (controller.physicalInputProfile.buttons[GCInputXboxPaddleOne] != nil) {
                device->has_xbox_paddles = SDL_TRUE;
                device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_PADDLE1);
                ++nbuttons;
            }
            if (controller.physicalInputProfile.buttons[GCInputXboxPaddleTwo] != nil) {
                device->has_xbox_paddles = SDL_TRUE;
                device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_PADDLE2);
                ++nbuttons;
            }
            if (controller.physicalInputProfile.buttons[GCInputXboxPaddleThree] != nil) {
                device->has_xbox_paddles = SDL_TRUE;
                device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_PADDLE3);
                ++nbuttons;
            }
            if (controller.physicalInputProfile.buttons[GCInputXboxPaddleFour] != nil) {
                device->has_xbox_paddles = SDL_TRUE;
                device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_PADDLE4);
                ++nbuttons;
            }
            if (controller.physicalInputProfile.buttons[GCInputXboxShareButton] != nil) {
                device->has_xbox_share_button = SDL_TRUE;
                device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_MISC1);
                ++nbuttons;
            }
        }
#endif
#pragma clang diagnostic pop

        if (is_xbox) {
            vendor = USB_VENDOR_MICROSOFT;
            if (device->has_xbox_paddles) {
                /* Assume Xbox One Elite Series 2 Controller unless/until GCController flows VID/PID */
                product = USB_PRODUCT_XBOX_ONE_ELITE_SERIES_2_BLUETOOTH;
                subtype = 1;
            } else if (device->has_xbox_share_button) {
                /* Assume Xbox Series X Controller unless/until GCController flows VID/PID */
                product = USB_PRODUCT_XBOX_SERIES_X_BLE;
                subtype = 1;
            } else {
                /* Assume Xbox One S Bluetooth Controller unless/until GCController flows VID/PID */
                product = USB_PRODUCT_XBOX_ONE_S_REV1_BLUETOOTH;
                subtype = 0;
            }
        } else if (is_ps4) {
            /* Assume DS4 Slim unless/until GCController flows VID/PID */
            vendor = USB_VENDOR_SONY;
            product = USB_PRODUCT_SONY_DS4_SLIM;
            if (device->has_dualshock_touchpad) {
                subtype = 1;
            } else {
                subtype = 0;
            }
        } else if (is_ps5) {
            vendor = USB_VENDOR_SONY;
            product = USB_PRODUCT_SONY_DS5;
            subtype = 0;
        } else if (is_switch_pro) {
            vendor = USB_VENDOR_NINTENDO;
            product = USB_PRODUCT_NINTENDO_SWITCH_PRO;
            subtype = 0;
        } else if (is_switch_joycon_pair) {
            vendor = USB_VENDOR_NINTENDO;
            product = USB_PRODUCT_NINTENDO_SWITCH_JOYCON_PAIR;
            subtype = 0;
        } else {
            vendor = USB_VENDOR_APPLE;
            product = 1;
            subtype = 1;
        }

        if (SDL_strcmp(name, "Backbone One") == 0) {
            /* The Backbone app uses share button */
            if ((device->button_mask & (1 << SDL_CONTROLLER_BUTTON_MISC1)) != 0) {
                device->button_mask &= ~(1 << SDL_CONTROLLER_BUTTON_MISC1);
                --nbuttons;
                device->has_xbox_share_button = SDL_FALSE;
            }
        }

        device->naxes = 6; /* 2 thumbsticks and 2 triggers */
        device->nhats = 1; /* d-pad */
        device->nbuttons = nbuttons;

    } else if (controller.gamepad) {
        BOOL is_switch_joyconL = IsControllerSwitchJoyConL(controller);
        BOOL is_switch_joyconR = IsControllerSwitchJoyConR(controller);
        int nbuttons = 0;

        if (is_switch_joyconL) {
            vendor = USB_VENDOR_NINTENDO;
            product = USB_PRODUCT_NINTENDO_SWITCH_JOYCON_LEFT;
            subtype = 0;
        } else if (is_switch_joyconR) {
            vendor = USB_VENDOR_NINTENDO;
            product = USB_PRODUCT_NINTENDO_SWITCH_JOYCON_RIGHT;
            subtype = 0;
        } else {
            vendor = USB_VENDOR_APPLE;
            product = 2;
            subtype = 2;
        }

        /* These buttons are part of the original MFi spec */
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_A);
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_B);
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_X);
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_Y);
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_LEFTSHOULDER);
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_RIGHTSHOULDER);
#if TARGET_OS_TV
        /* The menu button is used by the OS and not available to applications */
        nbuttons += 6;
#else
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_START);
        nbuttons += 7;
        device->uses_pause_handler = SDL_TRUE;
#endif

        device->naxes = 0; /* no traditional analog inputs */
        device->nhats = 1; /* d-pad */
        device->nbuttons = nbuttons;
    }
#if TARGET_OS_TV
    else if (controller.microGamepad) {
        int nbuttons = 0;

        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_A);
        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_B); /* Button X on microGamepad */
        nbuttons += 2;

        device->button_mask |= (1 << SDL_CONTROLLER_BUTTON_START);
        ++nbuttons;
        device->uses_pause_handler = SDL_TRUE;

        vendor = USB_VENDOR_APPLE;
        product = 3;
        subtype = 3;
        device->naxes = 2; /* treat the touch surface as two axes */
        device->nhats = 0; /* apparently the touch surface-as-dpad is buggy */
        device->nbuttons = nbuttons;

        controller.microGamepad.allowsRotation = SDL_GetHintBoolean(SDL_HINT_APPLE_TV_REMOTE_ALLOW_ROTATION, SDL_FALSE);
    }
#endif /* TARGET_OS_TV */

    if (vendor == USB_VENDOR_APPLE) {
        /* Note that this is an MFI controller and what subtype it is */
        device->guid = SDL_CreateJoystickGUID(SDL_HARDWARE_BUS_BLUETOOTH, vendor, product, 0, name, 'm', subtype);
    } else {
        device->guid = SDL_CreateJoystickGUID(SDL_HARDWARE_BUS_BLUETOOTH, vendor, product, 0, name, 0, subtype);
    }

    /* Update the GUID with capability bits */
    {
        Uint16 *guid16 = (Uint16 *)device->guid.data;
        guid16[6] = SDL_SwapLE16(device->button_mask);
    }

    /* This will be set when the first button press of the controller is
     * detected. */
    controller.playerIndex = -1;
    return TRUE;
}
#endif /* SDL_JOYSTICK_MFI */

#if defined(SDL_JOYSTICK_iOS_ACCELEROMETER) || defined(SDL_JOYSTICK_MFI)
static void
IOS_AddJoystickDevice(GCController *controller, SDL_bool accelerometer)
{
    SDL_JoystickDeviceItem *device = deviceList;

#if TARGET_OS_TV
    if (!SDL_GetHintBoolean(SDL_HINT_TV_REMOTE_AS_JOYSTICK, SDL_TRUE)) {
        /* Ignore devices that aren't actually controllers (e.g. remotes), they'll be handled as keyboard input */
        if (controller && !controller.extendedGamepad && !controller.gamepad && controller.microGamepad) {
            return;
        }
    }
#endif

    while (device != NULL) {
        if (device->controller == controller) {
            return;
        }
        device = device->next;
    }

    device = (SDL_JoystickDeviceItem *) SDL_calloc(1, sizeof(SDL_JoystickDeviceItem));
    if (device == NULL) {
        return;
    }

    device->accelerometer = accelerometer;
    device->instance_id = SDL_GetNextJoystickInstanceID();

    if (accelerometer) {
#ifdef SDL_JOYSTICK_iOS_ACCELEROMETER
        device->name = SDL_strdup(accelerometerName);
        device->naxes = 3; /* Device acceleration in the x, y, and z axes. */
        device->nhats = 0;
        device->nbuttons = 0;

        /* Use the accelerometer name as a GUID. */
        SDL_memcpy(&device->guid.data, device->name, SDL_min(sizeof(SDL_JoystickGUID), SDL_strlen(device->name)));
#else
        SDL_free(device);
        return;
#endif /* SDL_JOYSTICK_iOS_ACCELEROMETER */
    } else if (controller) {
#ifdef SDL_JOYSTICK_MFI
        if (!IOS_AddMFIJoystickDevice(device, controller)) {
            SDL_free(device);
            return;
        }
#else
        SDL_free(device);
        return;
#endif /* SDL_JOYSTICK_MFI */
    }

    if (deviceList == NULL) {
        deviceList = device;
    } else {
        SDL_JoystickDeviceItem *lastdevice = deviceList;
        while (lastdevice->next != NULL) {
            lastdevice = lastdevice->next;
        }
        lastdevice->next = device;
    }

    ++numjoysticks;

    SDL_PrivateJoystickAdded(device->instance_id);
}
#endif /* SDL_JOYSTICK_iOS_ACCELEROMETER || SDL_JOYSTICK_MFI */

static SDL_JoystickDeviceItem *
IOS_RemoveJoystickDevice(SDL_JoystickDeviceItem *device)
{
    SDL_JoystickDeviceItem *prev = NULL;
    SDL_JoystickDeviceItem *next = NULL;
    SDL_JoystickDeviceItem *item = deviceList;

    if (device == NULL) {
        return NULL;
    }

    next = device->next;

    while (item != NULL) {
        if (item == device) {
            break;
        }
        prev = item;
        item = item->next;
    }

    /* Unlink the device item from the device list. */
    if (prev) {
        prev->next = device->next;
    } else if (device == deviceList) {
        deviceList = device->next;
    }

    if (device->joystick) {
        device->joystick->hwdata = NULL;
    }

#ifdef SDL_JOYSTICK_MFI
    @autoreleasepool {
        if (device->controller) {
            /* The controller was explicitly retained in the struct, so it
             * should be explicitly released before freeing the struct. */
            GCController *controller = CFBridgingRelease((__bridge CFTypeRef)(device->controller));
            controller.controllerPausedHandler = nil;
            device->controller = nil;
        }
    }
#endif /* SDL_JOYSTICK_MFI */

    --numjoysticks;

    SDL_PrivateJoystickRemoved(device->instance_id);

    SDL_free(device->name);
    SDL_free(device);

    return next;
}

#if TARGET_OS_TV
static void SDLCALL
SDL_AppleTVRemoteRotationHintChanged(void *udata, const char *name, const char *oldValue, const char *newValue)
{
    BOOL allowRotation = newValue != NULL && *newValue != '0';

    @autoreleasepool {
        for (GCController *controller in [GCController controllers]) {
            if (controller.microGamepad) {
                controller.microGamepad.allowsRotation = allowRotation;
            }
        }
    }
}
#endif /* TARGET_OS_TV */

static int
IOS_JoystickInit(void)
{
#if defined(__MACOSX__)
#if _SDL_HAS_BUILTIN(__builtin_available)
    if (@available(macOS 10.16, *)) {
        /* Continue with initialization on macOS 11+ */
    } else {
        return 0;
    }
#else
    /* No @available, must be an older macOS version */
    return 0;
#endif
#endif

    @autoreleasepool {
#ifdef SDL_JOYSTICK_MFI
        NSNotificationCenter *center;
#endif
#ifdef SDL_JOYSTICK_iOS_ACCELEROMETER
        if (SDL_GetHintBoolean(SDL_HINT_ACCELEROMETER_AS_JOYSTICK, SDL_TRUE)) {
            /* Default behavior, accelerometer as joystick */
            IOS_AddJoystickDevice(nil, SDL_TRUE);
        }
#endif

#ifdef SDL_JOYSTICK_MFI
        /* GameController.framework was added in iOS 7. */
        if (![GCController class]) {
            return 0;
        }

        /* For whatever reason, this always returns an empty array on
         macOS 11.0.1 */
        for (GCController *controller in [GCController controllers]) {
            IOS_AddJoystickDevice(controller, SDL_FALSE);
        }

#if TARGET_OS_TV
        SDL_AddHintCallback(SDL_HINT_APPLE_TV_REMOTE_ALLOW_ROTATION,
                            SDL_AppleTVRemoteRotationHintChanged, NULL);
#endif /* TARGET_OS_TV */

        center = [NSNotificationCenter defaultCenter];

        connectObserver = [center addObserverForName:GCControllerDidConnectNotification
                                              object:nil
                                               queue:nil
                                          usingBlock:^(NSNotification *note) {
                                              GCController *controller = note.object;
                                              SDL_LockJoysticks();
                                              IOS_AddJoystickDevice(controller, SDL_FALSE);
                                              SDL_UnlockJoysticks();
                                          }];

        disconnectObserver = [center addObserverForName:GCControllerDidDisconnectNotification
                                                 object:nil
                                                  queue:nil
                                             usingBlock:^(NSNotification *note) {
                                                 GCController *controller = note.object;
                                                 SDL_JoystickDeviceItem *device;
                                                 SDL_LockJoysticks();
                                                 for (device = deviceList; device != NULL; device = device->next) {
                                                     if (device->controller == controller) {
                                                         IOS_RemoveJoystickDevice(device);
                                                         break;
                                                     }
                                                 }
                                                 SDL_UnlockJoysticks();
                                             }];
#endif /* SDL_JOYSTICK_MFI */
    }

    return 0;
}

static int
IOS_JoystickGetCount(void)
{
    return numjoysticks;
}

static void
IOS_JoystickDetect(void)
{
}

static const char *
IOS_JoystickGetDeviceName(int device_index)
{
    SDL_JoystickDeviceItem *device = GetDeviceForIndex(device_index);
    return device ? device->name : "Unknown";
}

static const char *
IOS_JoystickGetDevicePath(int device_index)
{
    return NULL;
}

static int
IOS_JoystickGetDevicePlayerIndex(int device_index)
{
#ifdef SDL_JOYSTICK_MFI
    SDL_JoystickDeviceItem *device = GetDeviceForIndex(device_index);
    if (device && device->controller) {
        return (int)device->controller.playerIndex;
    }
#endif
    return -1;
}

static void
IOS_JoystickSetDevicePlayerIndex(int device_index, int player_index)
{
#ifdef SDL_JOYSTICK_MFI
    SDL_JoystickDeviceItem *device = GetDeviceForIndex(device_index);
    if (device && device->controller) {
        device->controller.playerIndex = player_index;
    }
#endif
}

static SDL_JoystickGUID
IOS_JoystickGetDeviceGUID(int device_index)
{
    SDL_JoystickDeviceItem *device = GetDeviceForIndex(device_index);
    SDL_JoystickGUID guid;
    if (device) {
        guid = device->guid;
    } else {
        SDL_zero(guid);
    }
    return guid;
}

static SDL_JoystickID
IOS_JoystickGetDeviceInstanceID(int device_index)
{
    SDL_JoystickDeviceItem *device = GetDeviceForIndex(device_index);
    return device ? device->instance_id : -1;
}

static int
IOS_JoystickOpen(SDL_Joystick *joystick, int device_index)
{
    SDL_JoystickDeviceItem *device = GetDeviceForIndex(device_index);
    if (device == NULL) {
        return SDL_SetError("Could not open Joystick: no hardware device for the specified index");
    }

    joystick->hwdata = device;
    joystick->instance_id = device->instance_id;

    joystick->naxes = device->naxes;
    joystick->nhats = device->nhats;
    joystick->nbuttons = device->nbuttons;
    joystick->nballs = 0;

    if (device->has_dualshock_touchpad) {
        SDL_PrivateJoystickAddTouchpad(joystick, 2);
    }

    device->joystick = joystick;

    @autoreleasepool {
        if (device->accelerometer) {
#ifdef SDL_JOYSTICK_iOS_ACCELEROMETER
            if (motionManager == nil) {
                motionManager = [[CMMotionManager alloc] init];
            }

            /* Shorter times between updates can significantly increase CPU usage. */
            motionManager.accelerometerUpdateInterval = 0.1;
            [motionManager startAccelerometerUpdates];
#endif
        } else {
#ifdef SDL_JOYSTICK_MFI
            if (device->uses_pause_handler) {
                GCController *controller = device->controller;
                controller.controllerPausedHandler = ^(GCController *c) {
                    if (joystick->hwdata) {
                        ++joystick->hwdata->num_pause_presses;
                    }
                };
            }

#ifdef ENABLE_MFI_SENSORS
            if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
                GCController *controller = joystick->hwdata->controller;
                GCMotion *motion = controller.motion;
                if (motion && motion.hasRotationRate) {
                    SDL_PrivateJoystickAddSensor(joystick, SDL_SENSOR_GYRO, 0.0f);
                }
                if (motion && motion.hasGravityAndUserAcceleration) {
                    SDL_PrivateJoystickAddSensor(joystick, SDL_SENSOR_ACCEL, 0.0f);
                }
            }
#endif /* ENABLE_MFI_SENSORS */

#ifdef ENABLE_MFI_SYSTEM_GESTURE_STATE
            if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
                GCController *controller = joystick->hwdata->controller;
                for (id key in controller.physicalInputProfile.buttons) {
                    GCControllerButtonInput *button = controller.physicalInputProfile.buttons[key];
                    if ([button isBoundToSystemGesture]) {
                        button.preferredSystemGestureState = GCSystemGestureStateDisabled;
                    }
                }
            }
#endif /* ENABLE_MFI_SYSTEM_GESTURE_STATE */

#endif /* SDL_JOYSTICK_MFI */
        }
    }
    if (device->remote) {
        ++SDL_AppleTVRemoteOpenedAsJoystick;
    }

    return 0;
}

static void
IOS_AccelerometerUpdate(SDL_Joystick *joystick)
{
#ifdef SDL_JOYSTICK_iOS_ACCELEROMETER
    const float maxgforce = SDL_IPHONE_MAX_GFORCE;
    const SInt16 maxsint16 = 0x7FFF;
    CMAcceleration accel;

    @autoreleasepool {
        if (!motionManager.isAccelerometerActive) {
            return;
        }

        accel = motionManager.accelerometerData.acceleration;
    }

    /*
     Convert accelerometer data from floating point to Sint16, which is what
     the joystick system expects.

     To do the conversion, the data is first clamped onto the interval
     [-SDL_IPHONE_MAX_G_FORCE, SDL_IPHONE_MAX_G_FORCE], then the data is multiplied
     by MAX_SINT16 so that it is mapped to the full range of an Sint16.

     You can customize the clamped range of this function by modifying the
     SDL_IPHONE_MAX_GFORCE macro in SDL_config_iphoneos.h.

     Once converted to Sint16, the accelerometer data no longer has coherent
     units. You can convert the data back to units of g-force by multiplying
     it in your application's code by SDL_IPHONE_MAX_GFORCE / 0x7FFF.
     */

    /* clamp the data */
    accel.x = SDL_clamp(accel.x, -maxgforce, maxgforce);
    accel.y = SDL_clamp(accel.y, -maxgforce, maxgforce);
    accel.z = SDL_clamp(accel.z, -maxgforce, maxgforce);

    /* pass in data mapped to range of SInt16 */
    SDL_PrivateJoystickAxis(joystick, 0,  (accel.x / maxgforce) * maxsint16);
    SDL_PrivateJoystickAxis(joystick, 1, -(accel.y / maxgforce) * maxsint16);
    SDL_PrivateJoystickAxis(joystick, 2,  (accel.z / maxgforce) * maxsint16);
#endif /* SDL_JOYSTICK_iOS_ACCELEROMETER */
}

#ifdef SDL_JOYSTICK_MFI
static Uint8
IOS_MFIJoystickHatStateForDPad(GCControllerDirectionPad *dpad)
{
    Uint8 hat = 0;

    if (dpad.up.isPressed) {
        hat |= SDL_HAT_UP;
    } else if (dpad.down.isPressed) {
        hat |= SDL_HAT_DOWN;
    }

    if (dpad.left.isPressed) {
        hat |= SDL_HAT_LEFT;
    } else if (dpad.right.isPressed) {
        hat |= SDL_HAT_RIGHT;
    }

    if (hat == 0) {
        return SDL_HAT_CENTERED;
    }

    return hat;
}
#endif

static void
IOS_MFIJoystickUpdate(SDL_Joystick *joystick)
{
#if SDL_JOYSTICK_MFI
    @autoreleasepool {
        GCController *controller = joystick->hwdata->controller;
        Uint8 hatstate = SDL_HAT_CENTERED;
        int i;
        int pause_button_index = 0;

#ifdef DEBUG_CONTROLLER_STATE
        if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
            if (controller.physicalInputProfile) {
                for (id key in controller.physicalInputProfile.buttons) {
                    GCControllerButtonInput *button = controller.physicalInputProfile.buttons[key];
                    if (button.isPressed)
                        NSLog(@"Button %@ = %s\n", key, button.isPressed ? "pressed" : "released");
                }
                for (id key in controller.physicalInputProfile.axes) {
                    GCControllerAxisInput *axis = controller.physicalInputProfile.axes[key];
                    if (axis.value != 0.0f)
                        NSLog(@"Axis %@ = %.2f\n", key, axis.value);
                }
            }
        }
#endif

        if (controller.extendedGamepad) {
            SDL_bool isstack;
            GCExtendedGamepad *gamepad = controller.extendedGamepad;

            /* Axis order matches the XInput Windows mappings. */
            Sint16 axes[] = {
                (Sint16) (gamepad.leftThumbstick.xAxis.value * 32767),
                (Sint16) (gamepad.leftThumbstick.yAxis.value * -32767),
                (Sint16) ((gamepad.leftTrigger.value * 65535) - 32768),
                (Sint16) (gamepad.rightThumbstick.xAxis.value * 32767),
                (Sint16) (gamepad.rightThumbstick.yAxis.value * -32767),
                (Sint16) ((gamepad.rightTrigger.value * 65535) - 32768),
            };

            /* Button order matches the XInput Windows mappings. */
            Uint8 *buttons = SDL_small_alloc(Uint8, joystick->nbuttons, &isstack);
            int button_count = 0;

            if (buttons == NULL) {
                SDL_OutOfMemory();
                return;
            }

            /* These buttons are part of the original MFi spec */
            buttons[button_count++] = gamepad.buttonA.isPressed;
            buttons[button_count++] = gamepad.buttonB.isPressed;
            buttons[button_count++] = gamepad.buttonX.isPressed;
            buttons[button_count++] = gamepad.buttonY.isPressed;
            buttons[button_count++] = gamepad.leftShoulder.isPressed;
            buttons[button_count++] = gamepad.rightShoulder.isPressed;

            /* These buttons are available on some newer controllers */
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunguarded-availability-new"
            if (joystick->hwdata->button_mask & (1 << SDL_CONTROLLER_BUTTON_LEFTSTICK)) {
                buttons[button_count++] = gamepad.leftThumbstickButton.isPressed;
            }
            if (joystick->hwdata->button_mask & (1 << SDL_CONTROLLER_BUTTON_RIGHTSTICK)) {
                buttons[button_count++] = gamepad.rightThumbstickButton.isPressed;
            }
            if (joystick->hwdata->button_mask & (1 << SDL_CONTROLLER_BUTTON_BACK)) {
                buttons[button_count++] = gamepad.buttonOptions.isPressed;
            }
            if (joystick->hwdata->button_mask & (1 << SDL_CONTROLLER_BUTTON_GUIDE)) {
                buttons[button_count++] = gamepad.buttonHome.isPressed;
            }
            /* This must be the last button, so we can optionally handle it with pause_button_index below */
            if (joystick->hwdata->button_mask & (1 << SDL_CONTROLLER_BUTTON_START)) {
                if (joystick->hwdata->uses_pause_handler) {
                    pause_button_index = button_count;
                    buttons[button_count++] = joystick->delayed_guide_button;
                } else {
                    buttons[button_count++] = gamepad.buttonMenu.isPressed;
                }
            }

#ifdef ENABLE_PHYSICAL_INPUT_PROFILE
            if (joystick->hwdata->has_dualshock_touchpad) {
                GCControllerDirectionPad *dpad;
                buttons[button_count++] = controller.physicalInputProfile.buttons[GCInputDualShockTouchpadButton].isPressed;

                dpad = controller.physicalInputProfile.dpads[GCInputDualShockTouchpadOne];
                if (dpad.xAxis.value || dpad.yAxis.value) {
                    SDL_PrivateJoystickTouchpad(joystick, 0, 0, SDL_PRESSED, (1.0f + dpad.xAxis.value) * 0.5f, 1.0f - (1.0f + dpad.yAxis.value) * 0.5f, 1.0f);
                } else {
                    SDL_PrivateJoystickTouchpad(joystick, 0, 0, SDL_RELEASED, 0.0f, 0.0f, 1.0f);
                }

                dpad = controller.physicalInputProfile.dpads[GCInputDualShockTouchpadTwo];
                if (dpad.xAxis.value || dpad.yAxis.value) {
                    SDL_PrivateJoystickTouchpad(joystick, 0, 1, SDL_PRESSED, (1.0f + dpad.xAxis.value) * 0.5f, 1.0f - (1.0f + dpad.yAxis.value) * 0.5f, 1.0f);
                } else {
                    SDL_PrivateJoystickTouchpad(joystick, 0, 1, SDL_RELEASED, 0.0f, 0.0f, 1.0f);
                }
            }

            if (joystick->hwdata->has_xbox_paddles) {
                if (joystick->hwdata->button_mask & (1 << SDL_CONTROLLER_BUTTON_PADDLE1)) {
                    buttons[button_count++] = controller.physicalInputProfile.buttons[GCInputXboxPaddleOne].isPressed;
                }
                if (joystick->hwdata->button_mask & (1 << SDL_CONTROLLER_BUTTON_PADDLE2)) {
                    buttons[button_count++] = controller.physicalInputProfile.buttons[GCInputXboxPaddleTwo].isPressed;
                }
                if (joystick->hwdata->button_mask & (1 << SDL_CONTROLLER_BUTTON_PADDLE3)) {
                    buttons[button_count++] = controller.physicalInputProfile.buttons[GCInputXboxPaddleThree].isPressed;
                }
                if (joystick->hwdata->button_mask & (1 << SDL_CONTROLLER_BUTTON_PADDLE4)) {
                    buttons[button_count++] = controller.physicalInputProfile.buttons[GCInputXboxPaddleFour].isPressed;
                }

                /*
                SDL_Log("Paddles: [%d,%d,%d,%d]",
                    controller.physicalInputProfile.buttons[GCInputXboxPaddleOne].isPressed,
                    controller.physicalInputProfile.buttons[GCInputXboxPaddleTwo].isPressed,
                    controller.physicalInputProfile.buttons[GCInputXboxPaddleThree].isPressed,
                    controller.physicalInputProfile.buttons[GCInputXboxPaddleFour].isPressed);
                */
            }

            if (joystick->hwdata->has_xbox_share_button) {
                buttons[button_count++] = controller.physicalInputProfile.buttons[GCInputXboxShareButton].isPressed;
            }
#endif
#pragma clang diagnostic pop

            hatstate = IOS_MFIJoystickHatStateForDPad(gamepad.dpad);

            for (i = 0; i < SDL_arraysize(axes); i++) {
                SDL_PrivateJoystickAxis(joystick, i, axes[i]);
            }

            for (i = 0; i < button_count; i++) {
                SDL_PrivateJoystickButton(joystick, i, buttons[i]);
            }

#ifdef ENABLE_MFI_SENSORS
            if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
                GCMotion *motion = controller.motion;
                if (motion && motion.sensorsActive) {
                    float data[3];

                    if (motion.hasRotationRate) {
                        GCRotationRate rate = motion.rotationRate;
                        data[0] = rate.x;
                        data[1] = rate.z;
                        data[2] = -rate.y;
                        SDL_PrivateJoystickSensor(joystick, SDL_SENSOR_GYRO, 0, data, 3);
                    }
                    if (motion.hasGravityAndUserAcceleration) {
                        GCAcceleration accel = motion.acceleration;
                        data[0] = -accel.x * SDL_STANDARD_GRAVITY;
                        data[1] = -accel.y * SDL_STANDARD_GRAVITY;
                        data[2] = -accel.z * SDL_STANDARD_GRAVITY;
                        SDL_PrivateJoystickSensor(joystick, SDL_SENSOR_ACCEL, 0, data, 3);
                    }
                }
            }
#endif /* ENABLE_MFI_SENSORS */

            SDL_small_free(buttons, isstack);
        } else if (controller.gamepad) {
            SDL_bool isstack;
            GCGamepad *gamepad = controller.gamepad;

            /* Button order matches the XInput Windows mappings. */
            Uint8 *buttons = SDL_small_alloc(Uint8, joystick->nbuttons, &isstack);
            int button_count = 0;

            if (buttons == NULL) {
                SDL_OutOfMemory();
                return;
            }

            buttons[button_count++] = gamepad.buttonA.isPressed;
            buttons[button_count++] = gamepad.buttonB.isPressed;
            buttons[button_count++] = gamepad.buttonX.isPressed;
            buttons[button_count++] = gamepad.buttonY.isPressed;
            buttons[button_count++] = gamepad.leftShoulder.isPressed;
            buttons[button_count++] = gamepad.rightShoulder.isPressed;
            pause_button_index = button_count;
            buttons[button_count++] = joystick->delayed_guide_button;

            hatstate = IOS_MFIJoystickHatStateForDPad(gamepad.dpad);

            for (i = 0; i < button_count; i++) {
                SDL_PrivateJoystickButton(joystick, i, buttons[i]);
            }

            SDL_small_free(buttons, isstack);
        }
#if TARGET_OS_TV
        else if (controller.microGamepad) {
            GCMicroGamepad *gamepad = controller.microGamepad;

            Sint16 axes[] = {
                (Sint16) (gamepad.dpad.xAxis.value * 32767),
                (Sint16) (gamepad.dpad.yAxis.value * -32767),
            };

            for (i = 0; i < SDL_arraysize(axes); i++) {
                SDL_PrivateJoystickAxis(joystick, i, axes[i]);
            }

            Uint8 buttons[joystick->nbuttons];
            int button_count = 0;
            buttons[button_count++] = gamepad.buttonA.isPressed;
            buttons[button_count++] = gamepad.buttonX.isPressed;
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunguarded-availability-new"
            /* This must be the last button, so we can optionally handle it with pause_button_index below */
            if (joystick->hwdata->button_mask & (1 << SDL_CONTROLLER_BUTTON_START)) {
                if (joystick->hwdata->uses_pause_handler) {
                    pause_button_index = button_count;
                    buttons[button_count++] = joystick->delayed_guide_button;
                } else {
                    buttons[button_count++] = gamepad.buttonMenu.isPressed;
                }
            }
#pragma clang diagnostic pop

            for (i = 0; i < button_count; i++) {
                SDL_PrivateJoystickButton(joystick, i, buttons[i]);
            }
        }
#endif /* TARGET_OS_TV */

        if (joystick->nhats > 0) {
            SDL_PrivateJoystickHat(joystick, 0, hatstate);
        }

        if (joystick->hwdata->uses_pause_handler) {
            for (i = 0; i < joystick->hwdata->num_pause_presses; i++) {
                SDL_PrivateJoystickButton(joystick, pause_button_index, SDL_PRESSED);
                SDL_PrivateJoystickButton(joystick, pause_button_index, SDL_RELEASED);
            }
            joystick->hwdata->num_pause_presses = 0;
        }

#ifdef ENABLE_MFI_BATTERY
        if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
            GCDeviceBattery *battery = controller.battery;
            if (battery) {
                SDL_JoystickPowerLevel ePowerLevel = SDL_JOYSTICK_POWER_UNKNOWN;

                switch (battery.batteryState) {
                case GCDeviceBatteryStateDischarging:
                    {
                        float power_level = battery.batteryLevel;
                        if (power_level <= 0.05f) {
                            ePowerLevel = SDL_JOYSTICK_POWER_EMPTY;
                        } else if (power_level <= 0.20f) {
                            ePowerLevel = SDL_JOYSTICK_POWER_LOW;
                        } else if (power_level <= 0.70f) {
                            ePowerLevel = SDL_JOYSTICK_POWER_MEDIUM;
                        } else {
                            ePowerLevel = SDL_JOYSTICK_POWER_FULL;
                        }
                    }
                    break;
                case GCDeviceBatteryStateCharging:
                    ePowerLevel = SDL_JOYSTICK_POWER_WIRED;
                    break;
                case GCDeviceBatteryStateFull:
                    ePowerLevel = SDL_JOYSTICK_POWER_FULL;
                    break;
                default:
                    break;
                }

                SDL_PrivateJoystickBatteryLevel(joystick, ePowerLevel);
            }
        }
#endif /* ENABLE_MFI_BATTERY */
    }
#endif /* SDL_JOYSTICK_MFI */
}

#ifdef ENABLE_MFI_RUMBLE

@interface SDL_RumbleMotor : NSObject
    @property(nonatomic,strong) CHHapticEngine *engine API_AVAILABLE(macos(10.16), ios(13.0), tvos(14.0));
    @property(nonatomic,strong) id<CHHapticPatternPlayer> player API_AVAILABLE(macos(10.16), ios(13.0), tvos(14.0));
    @property bool active;
@end

@implementation SDL_RumbleMotor {
}

-(void)cleanup
{
    @autoreleasepool {
        if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
            if (self.player != nil) {
                [self.player cancelAndReturnError:nil];
                self.player = nil;
            }
            if (self.engine != nil) {
                [self.engine stopWithCompletionHandler:nil];
                self.engine = nil;
            }
        }
    }
}

-(int)setIntensity:(float)intensity
{
    @autoreleasepool {
        if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
            NSError *error = nil;
            CHHapticDynamicParameter *param;

            if (self.engine == nil) {
                return SDL_SetError("Haptics engine was stopped");
            }

            if (intensity == 0.0f) {
                if (self.player && self.active) {
                    [self.player stopAtTime:0 error:&error];
                }
                self.active = false;
                return 0;
            }

            if (self.player == nil) {
                CHHapticEventParameter *event_param = [[CHHapticEventParameter alloc] initWithParameterID:CHHapticEventParameterIDHapticIntensity value:1.0f];
                CHHapticEvent *event = [[CHHapticEvent alloc] initWithEventType:CHHapticEventTypeHapticContinuous parameters:[NSArray arrayWithObjects:event_param, nil] relativeTime:0 duration:GCHapticDurationInfinite];
                CHHapticPattern *pattern = [[CHHapticPattern alloc] initWithEvents:[NSArray arrayWithObject:event] parameters:[[NSArray alloc] init] error:&error];
                if (error != nil) {
                    return SDL_SetError("Couldn't create haptic pattern: %s", [error.localizedDescription UTF8String]);
                }

                self.player = [self.engine createPlayerWithPattern:pattern error:&error];
                if (error != nil) {
                    return SDL_SetError("Couldn't create haptic player: %s", [error.localizedDescription UTF8String]);
                }
                self.active = false;
            }

            param = [[CHHapticDynamicParameter alloc] initWithParameterID:CHHapticDynamicParameterIDHapticIntensityControl value:intensity relativeTime:0];
            [self.player sendParameters:[NSArray arrayWithObject:param] atTime:0 error:&error];
            if (error != nil) {
                return SDL_SetError("Couldn't update haptic player: %s", [error.localizedDescription UTF8String]);
            }

            if (!self.active) {
                [self.player startAtTime:0 error:&error];
                self.active = true;
            }
        }

        return 0;
    }
}

-(id) initWithController:(GCController*)controller locality:(GCHapticsLocality)locality API_AVAILABLE(macos(10.16), ios(14.0), tvos(14.0))
{
    @autoreleasepool {
        NSError *error;
        __weak __typeof(self) weakSelf;
        self = [super init];
        weakSelf = self;

        self.engine = [controller.haptics createEngineWithLocality:locality];
        if (self.engine == nil) {
            SDL_SetError("Couldn't create haptics engine");
            return nil;
        }

        [self.engine startAndReturnError:&error];
        if (error != nil) {
            SDL_SetError("Couldn't start haptics engine");
            return nil;
        }

        self.engine.stoppedHandler = ^(CHHapticEngineStoppedReason stoppedReason) {
            SDL_RumbleMotor *_this = weakSelf;
            if (_this == nil) {
                return;
            }

            _this.player = nil;
            _this.engine = nil;
        };
        self.engine.resetHandler = ^{
            SDL_RumbleMotor *_this = weakSelf;
            if (_this == nil) {
                return;
            }

            _this.player = nil;
            [_this.engine startAndReturnError:nil];
        };

        return self;
    }
}

@end

@interface SDL_RumbleContext : NSObject
    @property(nonatomic,strong) SDL_RumbleMotor *m_low_frequency_motor;
    @property(nonatomic,strong) SDL_RumbleMotor *m_high_frequency_motor;
    @property(nonatomic,strong) SDL_RumbleMotor *m_left_trigger_motor;
    @property(nonatomic,strong) SDL_RumbleMotor *m_right_trigger_motor;
@end

@implementation SDL_RumbleContext {
}

-(id) initWithLowFrequencyMotor:(SDL_RumbleMotor*)low_frequency_motor
             HighFrequencyMotor:(SDL_RumbleMotor*)high_frequency_motor
               LeftTriggerMotor:(SDL_RumbleMotor*)left_trigger_motor
              RightTriggerMotor:(SDL_RumbleMotor*)right_trigger_motor
{
    self = [super init];
    self.m_low_frequency_motor = low_frequency_motor;
    self.m_high_frequency_motor = high_frequency_motor;
    self.m_left_trigger_motor = left_trigger_motor;
    self.m_right_trigger_motor = right_trigger_motor;
    return self;
}

-(int) rumbleWithLowFrequency:(Uint16)low_frequency_rumble andHighFrequency:(Uint16)high_frequency_rumble
{
    int result = 0;

    result += [self.m_low_frequency_motor setIntensity:((float)low_frequency_rumble / 65535.0f)];
    result += [self.m_high_frequency_motor setIntensity:((float)high_frequency_rumble / 65535.0f)];
    return ((result < 0) ? -1 : 0);
}

-(int) rumbleLeftTrigger:(Uint16)left_rumble andRightTrigger:(Uint16)right_rumble
{
    int result = 0;

    if (self.m_left_trigger_motor && self.m_right_trigger_motor) {
        result += [self.m_left_trigger_motor setIntensity:((float)left_rumble / 65535.0f)];
        result += [self.m_right_trigger_motor setIntensity:((float)right_rumble / 65535.0f)];
    } else {
        result = SDL_Unsupported();
    }
    return ((result < 0) ? -1 : 0);
}

-(void)cleanup
{
    [self.m_low_frequency_motor cleanup];
    [self.m_high_frequency_motor cleanup];
}

@end

static SDL_RumbleContext *IOS_JoystickInitRumble(GCController *controller)
{
    @autoreleasepool {
        if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
            SDL_RumbleMotor *low_frequency_motor = [[SDL_RumbleMotor alloc] initWithController:controller locality:GCHapticsLocalityLeftHandle];
            SDL_RumbleMotor *high_frequency_motor = [[SDL_RumbleMotor alloc] initWithController:controller locality:GCHapticsLocalityRightHandle];
            SDL_RumbleMotor *left_trigger_motor = [[SDL_RumbleMotor alloc] initWithController:controller locality:GCHapticsLocalityLeftTrigger];
            SDL_RumbleMotor *right_trigger_motor = [[SDL_RumbleMotor alloc] initWithController:controller locality:GCHapticsLocalityRightTrigger];
            if (low_frequency_motor && high_frequency_motor) {
                return [[SDL_RumbleContext alloc] initWithLowFrequencyMotor:low_frequency_motor
                                                         HighFrequencyMotor:high_frequency_motor
                                                           LeftTriggerMotor:left_trigger_motor
                                                          RightTriggerMotor:right_trigger_motor];
            }
        }
    }
    return nil;
}

#endif /* ENABLE_MFI_RUMBLE */

static int
IOS_JoystickRumble(SDL_Joystick *joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble)
{
#ifdef ENABLE_MFI_RUMBLE
    SDL_JoystickDeviceItem *device = joystick->hwdata;

    if (device == NULL) {
        return SDL_SetError("Controller is no longer connected");
    }

    if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
        if (!device->rumble && device->controller && device->controller.haptics) {
            SDL_RumbleContext *rumble = IOS_JoystickInitRumble(device->controller);
            if (rumble) {
                device->rumble = (void *)CFBridgingRetain(rumble);
            }
        }
    }

    if (device->rumble) {
        SDL_RumbleContext *rumble = (__bridge SDL_RumbleContext *)device->rumble;
        return [rumble rumbleWithLowFrequency:low_frequency_rumble andHighFrequency:high_frequency_rumble];
    } else {
        return SDL_Unsupported();
    }
#else
    return SDL_Unsupported();
#endif
}

static int
IOS_JoystickRumbleTriggers(SDL_Joystick *joystick, Uint16 left_rumble, Uint16 right_rumble)
{
#ifdef ENABLE_MFI_RUMBLE
    SDL_JoystickDeviceItem *device = joystick->hwdata;

    if (device == NULL) {
        return SDL_SetError("Controller is no longer connected");
    }

    if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
        if (!device->rumble && device->controller && device->controller.haptics) {
            SDL_RumbleContext *rumble = IOS_JoystickInitRumble(device->controller);
            if (rumble) {
                device->rumble = (void *)CFBridgingRetain(rumble);
            }
        }
    }

    if (device->rumble) {
        SDL_RumbleContext *rumble = (__bridge SDL_RumbleContext *)device->rumble;
        return [rumble rumbleLeftTrigger:left_rumble andRightTrigger:right_rumble];
    } else {
        return SDL_Unsupported();
    }
#else
    return SDL_Unsupported();
#endif
}

static Uint32
IOS_JoystickGetCapabilities(SDL_Joystick *joystick)
{
    Uint32 result = 0;

#if defined(ENABLE_MFI_LIGHT) || defined(ENABLE_MFI_RUMBLE)
    @autoreleasepool {
        SDL_JoystickDeviceItem *device = joystick->hwdata;

        if (device == NULL) {
            return 0;
        }

        if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
            GCController *controller = device->controller;
            #ifdef ENABLE_MFI_LIGHT
            if (controller.light) {
                result |= SDL_JOYCAP_LED;
            }
            #endif

            #ifdef ENABLE_MFI_RUMBLE
            if (controller.haptics) {
                for (GCHapticsLocality locality in controller.haptics.supportedLocalities) {
                    if ([locality isEqualToString:GCHapticsLocalityHandles]) {
                        result |= SDL_JOYCAP_RUMBLE;
                    } else if ([locality isEqualToString:GCHapticsLocalityTriggers]) {
                        result |= SDL_JOYCAP_RUMBLE_TRIGGERS;
                    }
                }
            }
            #endif
        }
    }
#endif /* ENABLE_MFI_LIGHT || ENABLE_MFI_RUMBLE */

    return result;
}

static int
IOS_JoystickSetLED(SDL_Joystick *joystick, Uint8 red, Uint8 green, Uint8 blue)
{
#ifdef ENABLE_MFI_LIGHT
    @autoreleasepool {
        SDL_JoystickDeviceItem *device = joystick->hwdata;

        if (device == NULL) {
            return SDL_SetError("Controller is no longer connected");
        }

        if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
            GCController *controller = device->controller;
            GCDeviceLight *light = controller.light;
            if (light) {
                light.color = [[GCColor alloc] initWithRed:(float)red / 255.0f
                                                     green:(float)green / 255.0f
                                                      blue:(float)blue / 255.0f];
                return 0;
            }
        }
    }
#endif /* ENABLE_MFI_LIGHT */

    return SDL_Unsupported();
}

static int
IOS_JoystickSendEffect(SDL_Joystick *joystick, const void *data, int size)
{
    return SDL_Unsupported();
}

static int
IOS_JoystickSetSensorsEnabled(SDL_Joystick *joystick, SDL_bool enabled)
{
#ifdef ENABLE_MFI_SENSORS
    @autoreleasepool {
        SDL_JoystickDeviceItem *device = joystick->hwdata;

        if (device == NULL) {
            return SDL_SetError("Controller is no longer connected");
        }

        if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
            GCController *controller = device->controller;
            GCMotion *motion = controller.motion;
            if (motion) {
                motion.sensorsActive = enabled ? YES : NO;
                return 0;
            }
        }
    }
#endif /* ENABLE_MFI_SENSORS */

    return SDL_Unsupported();
}

static void
IOS_JoystickUpdate(SDL_Joystick *joystick)
{
    SDL_JoystickDeviceItem *device = joystick->hwdata;

    if (device == NULL) {
        return;
    }

    if (device->accelerometer) {
        IOS_AccelerometerUpdate(joystick);
    } else if (device->controller) {
        IOS_MFIJoystickUpdate(joystick);
    }
}

static void
IOS_JoystickClose(SDL_Joystick *joystick)
{
    SDL_JoystickDeviceItem *device = joystick->hwdata;

    if (device == NULL) {
        return;
    }

    device->joystick = NULL;

    @autoreleasepool {
#ifdef ENABLE_MFI_RUMBLE
        if (device->rumble) {
            SDL_RumbleContext *rumble = (__bridge SDL_RumbleContext *)device->rumble;

            [rumble cleanup];
            CFRelease(device->rumble);
            device->rumble = NULL;
        }
#endif /* ENABLE_MFI_RUMBLE */

        if (device->accelerometer) {
#ifdef SDL_JOYSTICK_iOS_ACCELEROMETER
            [motionManager stopAccelerometerUpdates];
#endif
        } else if (device->controller) {
#ifdef SDL_JOYSTICK_MFI
            GCController *controller = device->controller;
            controller.controllerPausedHandler = nil;
            controller.playerIndex = -1;

#ifdef ENABLE_MFI_SYSTEM_GESTURE_STATE
            if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
                for (id key in controller.physicalInputProfile.buttons) {
                    GCControllerButtonInput *button = controller.physicalInputProfile.buttons[key];
                    if ([button isBoundToSystemGesture]) {
                        button.preferredSystemGestureState = GCSystemGestureStateEnabled;
                    }
                }
            }
#endif /* ENABLE_MFI_SYSTEM_GESTURE_STATE */

#endif /* SDL_JOYSTICK_MFI */
        }
    }
    if (device->remote) {
        --SDL_AppleTVRemoteOpenedAsJoystick;
    }
}

static void
IOS_JoystickQuit(void)
{
    @autoreleasepool {
#ifdef SDL_JOYSTICK_MFI
        NSNotificationCenter *center = [NSNotificationCenter defaultCenter];

        if (connectObserver) {
            [center removeObserver:connectObserver name:GCControllerDidConnectNotification object:nil];
            connectObserver = nil;
        }

        if (disconnectObserver) {
            [center removeObserver:disconnectObserver name:GCControllerDidDisconnectNotification object:nil];
            disconnectObserver = nil;
        }

#if TARGET_OS_TV
        SDL_DelHintCallback(SDL_HINT_APPLE_TV_REMOTE_ALLOW_ROTATION,
                            SDL_AppleTVRemoteRotationHintChanged, NULL);
#endif /* TARGET_OS_TV */
#endif /* SDL_JOYSTICK_MFI */

        while (deviceList != NULL) {
            IOS_RemoveJoystickDevice(deviceList);
        }

#ifdef SDL_JOYSTICK_iOS_ACCELEROMETER
        motionManager = nil;
#endif
    }

    numjoysticks = 0;
}

static SDL_bool
IOS_JoystickGetGamepadMapping(int device_index, SDL_GamepadMapping *out)
{
    return SDL_FALSE;
}

#if defined(SDL_JOYSTICK_MFI) && defined(__MACOSX__)
SDL_bool IOS_SupportedHIDDevice(IOHIDDeviceRef device)
{
    if (@available(macOS 10.16, *)) {
        if ([GCController supportsHIDDevice:device]) {
            return SDL_TRUE;
        }

        /* GCController supportsHIDDevice may return false if the device hasn't been
         * seen by the framework yet, so check a few controllers we know are supported.
         */
        {
            Sint32 vendor = 0;
            Sint32 product = 0;
            CFTypeRef refCF = NULL;

            refCF = IOHIDDeviceGetProperty(device, CFSTR(kIOHIDVendorIDKey));
            if (refCF) {
                CFNumberGetValue(refCF, kCFNumberSInt32Type, &vendor);
            }

            refCF = IOHIDDeviceGetProperty(device, CFSTR(kIOHIDProductIDKey));
            if (refCF) {
                CFNumberGetValue(refCF, kCFNumberSInt32Type, &product);
            }

            if (vendor == USB_VENDOR_MICROSOFT && SDL_IsJoystickXboxSeriesX(vendor, product)) {
                return SDL_TRUE;
            }
        }
    }
    return SDL_FALSE;
}
#endif

#if defined(SDL_JOYSTICK_MFI) && defined(ENABLE_PHYSICAL_INPUT_PROFILE)
static void
GetAppleSFSymbolsNameForElement(GCControllerElement *element, char *name)
{
    if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
        if (element) {
            [element.sfSymbolsName getCString: name maxLength: 255 encoding: NSASCIIStringEncoding];
        }
    }
}

static GCControllerDirectionPad *
GetDirectionalPadForController(GCController *controller)
{
    if (controller.extendedGamepad) {
        return controller.extendedGamepad.dpad;
    }

    if (controller.gamepad) {
        return controller.gamepad.dpad;
    }

    if (controller.microGamepad) {
        return controller.microGamepad.dpad;
    }

    return nil;
}
#endif /* SDL_JOYSTICK_MFI && ENABLE_PHYSICAL_INPUT_PROFILE */

static char elementName[256];

const char *
IOS_GameControllerGetAppleSFSymbolsNameForButton(SDL_GameController *gamecontroller, SDL_GameControllerButton button)
{
    elementName[0] = '\0';
#if defined(SDL_JOYSTICK_MFI) && defined(ENABLE_PHYSICAL_INPUT_PROFILE)
    if (gamecontroller && SDL_GameControllerGetJoystick(gamecontroller)->driver == &SDL_IOS_JoystickDriver) {
        if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
            GCController *controller = SDL_GameControllerGetJoystick(gamecontroller)->hwdata->controller;
            if ([controller respondsToSelector:@selector(physicalInputProfile)]) {
                NSDictionary<NSString *,GCControllerElement *> *elements = controller.physicalInputProfile.elements;
                switch (button)
                {
                case SDL_CONTROLLER_BUTTON_A:
                    GetAppleSFSymbolsNameForElement(elements[GCInputButtonA], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_B:
                    GetAppleSFSymbolsNameForElement(elements[GCInputButtonB], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_X:
                    GetAppleSFSymbolsNameForElement(elements[GCInputButtonX], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_Y:
                    GetAppleSFSymbolsNameForElement(elements[GCInputButtonY], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_BACK:
                    GetAppleSFSymbolsNameForElement(elements[GCInputButtonOptions], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_GUIDE:
                    GetAppleSFSymbolsNameForElement(elements[GCInputButtonHome], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_START:
                    GetAppleSFSymbolsNameForElement(elements[GCInputButtonMenu], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_LEFTSTICK:
                    GetAppleSFSymbolsNameForElement(elements[GCInputLeftThumbstickButton], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_RIGHTSTICK:
                    GetAppleSFSymbolsNameForElement(elements[GCInputRightThumbstickButton], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_LEFTSHOULDER:
                    GetAppleSFSymbolsNameForElement(elements[GCInputLeftShoulder], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_RIGHTSHOULDER:
                    GetAppleSFSymbolsNameForElement(elements[GCInputRightShoulder], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_DPAD_UP: {
                    GCControllerDirectionPad * dpad = GetDirectionalPadForController(controller);
                    if (dpad) {
                        GetAppleSFSymbolsNameForElement(dpad.up, elementName);
                        if (SDL_strlen(elementName) == 0) {
                            SDL_strlcpy(elementName, "dpad.up.fill", sizeof(elementName));
                        }
                    }
                    break;
                }
                case SDL_CONTROLLER_BUTTON_DPAD_DOWN: {
                    GCControllerDirectionPad * dpad = GetDirectionalPadForController(controller);
                    if (dpad) {
                        GetAppleSFSymbolsNameForElement(dpad.down, elementName);
                        if (SDL_strlen(elementName) == 0) {
                            SDL_strlcpy(elementName, "dpad.down.fill", sizeof(elementName));
                        }
                    }
                    break;
                }
                case SDL_CONTROLLER_BUTTON_DPAD_LEFT: {
                    GCControllerDirectionPad * dpad = GetDirectionalPadForController(controller);
                    if (dpad) {
                        GetAppleSFSymbolsNameForElement(dpad.left, elementName);
                        if (SDL_strlen(elementName) == 0) {
                            SDL_strlcpy(elementName, "dpad.left.fill", sizeof(elementName));
                        }
                    }
                    break;
                }
                case SDL_CONTROLLER_BUTTON_DPAD_RIGHT: {
                    GCControllerDirectionPad * dpad = GetDirectionalPadForController(controller);
                    if (dpad) {
                        GetAppleSFSymbolsNameForElement(dpad.right, elementName);
                        if (SDL_strlen(elementName) == 0) {
                            SDL_strlcpy(elementName, "dpad.right.fill", sizeof(elementName));
                        }
                    }
                    break;
                }
                case SDL_CONTROLLER_BUTTON_MISC1:
                    GetAppleSFSymbolsNameForElement(elements[GCInputDualShockTouchpadButton], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_PADDLE1:
                    GetAppleSFSymbolsNameForElement(elements[GCInputXboxPaddleOne], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_PADDLE2:
                    GetAppleSFSymbolsNameForElement(elements[GCInputXboxPaddleTwo], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_PADDLE3:
                    GetAppleSFSymbolsNameForElement(elements[GCInputXboxPaddleThree], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_PADDLE4:
                    GetAppleSFSymbolsNameForElement(elements[GCInputXboxPaddleFour], elementName);
                    break;
                case SDL_CONTROLLER_BUTTON_TOUCHPAD:
                    GetAppleSFSymbolsNameForElement(elements[GCInputDualShockTouchpadButton], elementName);
                    break;
                default:
                    break;
                }
            }
        }
    }
#endif
    return elementName;
}

const char *
IOS_GameControllerGetAppleSFSymbolsNameForAxis(SDL_GameController *gamecontroller, SDL_GameControllerAxis axis)
{
    elementName[0] = '\0';
#if defined(SDL_JOYSTICK_MFI) && defined(ENABLE_PHYSICAL_INPUT_PROFILE)
    if (gamecontroller && SDL_GameControllerGetJoystick(gamecontroller)->driver == &SDL_IOS_JoystickDriver) {
        if (@available(macOS 10.16, iOS 14.0, tvOS 14.0, *)) {
            GCController *controller = SDL_GameControllerGetJoystick(gamecontroller)->hwdata->controller;
            if ([controller respondsToSelector:@selector(physicalInputProfile)]) {
                NSDictionary<NSString *,GCControllerElement *> *elements = controller.physicalInputProfile.elements;
                switch (axis)
                {
                case SDL_CONTROLLER_AXIS_LEFTX:
                    GetAppleSFSymbolsNameForElement(elements[GCInputLeftThumbstick], elementName);
                    break;
                case SDL_CONTROLLER_AXIS_LEFTY:
                    GetAppleSFSymbolsNameForElement(elements[GCInputLeftThumbstick], elementName);
                    break;
                case SDL_CONTROLLER_AXIS_RIGHTX:
                    GetAppleSFSymbolsNameForElement(elements[GCInputRightThumbstick], elementName);
                    break;
                case SDL_CONTROLLER_AXIS_RIGHTY:
                    GetAppleSFSymbolsNameForElement(elements[GCInputRightThumbstick], elementName);
                    break;
                case SDL_CONTROLLER_AXIS_TRIGGERLEFT:
                    GetAppleSFSymbolsNameForElement(elements[GCInputLeftTrigger], elementName);
                    break;
                case SDL_CONTROLLER_AXIS_TRIGGERRIGHT:
                    GetAppleSFSymbolsNameForElement(elements[GCInputRightTrigger], elementName);
                    break;
                default:
                    break;
                }
            }
        }
    }
#endif
    return *elementName ? elementName : NULL;
}


SDL_JoystickDriver SDL_IOS_JoystickDriver =
{
    IOS_JoystickInit,
    IOS_JoystickGetCount,
    IOS_JoystickDetect,
    IOS_JoystickGetDeviceName,
    IOS_JoystickGetDevicePath,
    IOS_JoystickGetDevicePlayerIndex,
    IOS_JoystickSetDevicePlayerIndex,
    IOS_JoystickGetDeviceGUID,
    IOS_JoystickGetDeviceInstanceID,
    IOS_JoystickOpen,
    IOS_JoystickRumble,
    IOS_JoystickRumbleTriggers,
    IOS_JoystickGetCapabilities,
    IOS_JoystickSetLED,
    IOS_JoystickSendEffect,
    IOS_JoystickSetSensorsEnabled,
    IOS_JoystickUpdate,
    IOS_JoystickClose,
    IOS_JoystickQuit,
    IOS_JoystickGetGamepadMapping
};

/* vi: set ts=4 sw=4 expandtab: */
