//  HIDExample_IOKit.swift
//  HIDExample_IOKit
//
//  Created by Edgars Klepers on 2/28/25.
//
//   This example demonstrates a method that works fine using IOKit.hid.
//   Required Hardware:  A Logitech G600 Gaming Mouse (https://support.logi.com/hc/en-ca/articles/360023465173-Logitech-G600-MMO-Gaming-Mouse-Technical-Specifications)
//   The purpose is to detect the macro buttons labeled G9-G20 on the side.

import Foundation
import IOKit.hid

let DeviceVendorId: UInt32 = 0x046D // Logitech
let DeviceProductId: UInt32 = 0xC24A // Gaming Mouse G600


@main struct HIDExample_IOKit {

    static func main() throws {
        let matchDict = [kIOHIDVendorIDKey: DeviceVendorId, kIOHIDProductIDKey: DeviceProductId] as Dictionary
        let g600HIDManager = IOHIDManagerCreate(kCFAllocatorDefault, IOOptionBits.zero)
        assert(CFGetTypeID(g600HIDManager) == IOHIDManagerGetTypeID())

        IOHIDManagerSetDeviceMatching(g600HIDManager,matchDict as! CFMutableDictionary)

        let openHidManagerResult = IOHIDManagerOpen(g600HIDManager, IOOptionBits.zero)
        if (openHidManagerResult != kIOReturnSuccess) {
            print("Error loading IOHIDManagerOpen: \(String(format:"0x%X", openHidManagerResult))")
        }
        assert(openHidManagerResult == kIOReturnSuccess)

        IOHIDManagerScheduleWithRunLoop(g600HIDManager, CFRunLoopGetCurrent(), CFRunLoopMode.defaultMode.rawValue)
        IOHIDManagerRegisterInputValueCallback(g600HIDManager,{ _, returnResult, callbackSender, valueRef in

            let elem = IOHIDValueGetElement(valueRef)
            let usage = IOHIDElementGetUsage(elem)
            let value = IOHIDValueGetIntegerValue(valueRef)

            if (usage == 0x80) {
                print("Success!, value: \(String(format:"0x%X", value))") // this is successful.
                return
            }
        }, nil)

        CFRunLoopRun()
    }
}