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import Foundation

import IOKit

let ARM64_DDC_7BIT_ADDRESS: UInt8 = 0x37 // This works with DisplayPort devices

let ARM64_DDC_DATA_ADDRESS: UInt8 = 0x51

class Arm64DDC: NSObject {

#if arch(arm64)

static let isArm64: Bool = true

#else

static let isArm64: Bool = false

#endif

static let MAX_MATCH_SCORE: Int = 20

struct IOregService {

var edidUUID: String = ""

var manufacturerID: String = ""

var productName: String = ""

var serialNumber: Int64 = 0

var alphanumericSerialNumber: String = ""

var location: String = ""

var ioDisplayLocation: String = ""

var transportUpstream: String = ""

var transportDownstream: String = ""

var service: IOAVService?

var serviceLocation: Int = 0

var displayAttributes: NSDictionary?

}

struct Arm64Service {

var displayID: CGDirectDisplayID = 0

var service: IOAVService?

var serviceLocation: Int = 0

var discouraged: Bool = false

var dummy: Bool = false

var serviceDetails: IOregService

var matchScore: Int = 0

}

static func getServiceMatches(displayIDs: [CGDirectDisplayID]) -> [Arm64Service] {

let ioregServicesForMatching = self.getIoregServicesForMatching()

var matchedDisplayServices: [Arm64Service] = []

var scoredCandidateDisplayServices: [Int: [Arm64Service]] = [:]

for displayID in displayIDs {

for ioregServiceForMatching in ioregServicesForMatching {

let score = self.ioregMatchScore(displayID: displayID, ioregEdidUUID: ioregServiceForMatching.edidUUID, ioDisplayLocation: ioregServiceForMatching.ioDisplayLocation, ioregProductName: ioregServiceForMatching.productName, ioregSerialNumber: ioregServiceForMatching.serialNumber, serviceLocation: ioregServiceForMatching.serviceLocation)

let discouraged = self.checkIfDiscouraged(ioregService: ioregServiceForMatching)

let dummy = self.checkIfDummy(ioregService: ioregServiceForMatching)

let displayService = Arm64Service(displayID: displayID, service: ioregServiceForMatching.service, serviceLocation: ioregServiceForMatching.serviceLocation, discouraged: discouraged, dummy: dummy, serviceDetails: ioregServiceForMatching, matchScore: score)

if scoredCandidateDisplayServices[score] == nil {

scoredCandidateDisplayServices[score] = []

}

scoredCandidateDisplayServices[score]?.append(displayService)

}

var takenServiceLocations: [Int] = []

var takenDisplayIDs: [CGDirectDisplayID] = []

for score in stride(from: self.MAX_MATCH_SCORE, to: 0, by: -1) {

if let scoredCandidateDisplayService = scoredCandidateDisplayServices[score] {

for candidateDisplayService in scoredCandidateDisplayService where !(takenDisplayIDs.contains(candidateDisplayService.displayID) || takenServiceLocations.contains(candidateDisplayService.serviceLocation)) {

takenDisplayIDs.append(candidateDisplayService.displayID)

takenServiceLocations.append(candidateDisplayService.serviceLocation)

matchedDisplayServices.append(candidateDisplayService)

}

return matchedDisplayServices

}

static func read(service: IOAVService?, command: UInt8, writeSleepTime: UInt32? = nil, numOfWriteCycles: UInt8? = nil, readSleepTime: UInt32? = nil, numOfRetryAttemps: UInt8? = nil, retrySleepTime: UInt32? = nil) -> (current: UInt16, max: UInt16)? {

var values: (UInt16, UInt16)?

var send: [UInt8] = [command]

var reply = [UInt8](repeating: 0, count: 11)

if Self.performDDCCommunication(service: service, send: &send, reply: &reply, writeSleepTime: writeSleepTime, numOfWriteCycles: numOfWriteCycles, readSleepTime: readSleepTime, numOfRetryAttemps: numOfRetryAttemps, retrySleepTime: retrySleepTime) {

let max = UInt16(reply[6]) * 256 + UInt16(reply[7])

let current = UInt16(reply[8]) * 256 + UInt16(reply[9])

values = (current, max)

} else {

values = nil

}

return values

}

static func write(service: IOAVService?, command: UInt8, value: UInt16, writeSleepTime: UInt32? = nil, numOfWriteCycles: UInt8? = nil, numOfRetryAttemps: UInt8? = nil, retrySleepTime: UInt32? = nil) -> Bool {

var send: [UInt8] = [command, UInt8(value >> 8), UInt8(value & 255)]

var reply: [UInt8] = []

return Self.performDDCCommunication(service: service, send: &send, reply: &reply, writeSleepTime: writeSleepTime, numOfWriteCycles: numOfWriteCycles, numOfRetryAttemps: numOfRetryAttemps, retrySleepTime: retrySleepTime)

}

static func performDDCCommunication(service: IOAVService?, send: inout [UInt8], reply: inout [UInt8], writeSleepTime: UInt32? = nil, numOfWriteCycles: UInt8? = nil, readSleepTime: UInt32? = nil, numOfRetryAttemps: UInt8? = nil, retrySleepTime: UInt32? = nil) -> Bool {

let dataAddress = ARM64_DDC_DATA_ADDRESS

var success = false

guard service != nil else {

return success

}

var packet: [UInt8] = [UInt8(0x80 | (send.count + 1)), UInt8(send.count)] + send + [0] // Note: the last byte is the place of the checksum, see next line!

packet[packet.count - 1] = self.checksum(chk: send.count == 1 ? ARM64_DDC_7BIT_ADDRESS << 1 : ARM64_DDC_7BIT_ADDRESS << 1 ^ dataAddress, data: &packet, start: 0, end: packet.count - 2)

for _ in 1 ... (numOfRetryAttemps ?? 4) + 1 {

for _ in 1 ... max((numOfWriteCycles ?? 2) + 0, 1) {

usleep(writeSleepTime ?? 10000)

success = IOAVServiceWriteI2C(service, UInt32(ARM64_DDC_7BIT_ADDRESS), UInt32(dataAddress), &packet, UInt32(packet.count)) == 0

}

if !reply.isEmpty {

usleep(readSleepTime ?? 50000)

if IOAVServiceReadI2C(service, UInt32(ARM64_DDC_7BIT_ADDRESS), 0, &reply, UInt32(reply.count)) == 0 {

success = self.checksum(chk: 0x50, data: &reply, start: 0, end: reply.count - 2) == reply[reply.count - 1]

}

if success {

return success

}

usleep(retrySleepTime ?? 20000)

}

return success

}

/// DDC checksum calculator

static func checksum(chk: UInt8, data: inout [UInt8], start: Int, end: Int) -> UInt8 {

var chkd: UInt8 = chk

for i in start ... end {

chkd ^= data[i]

}

return chkd

}

static func ioregMatchScore(displayID: CGDirectDisplayID, ioregEdidUUID: String, ioDisplayLocation: String = "", ioregProductName: String = "", ioregSerialNumber: Int64 = 0, serviceLocation _: Int = 0) -> Int {

var matchScore = 0

if let dictionary = CoreDisplay_DisplayCreateInfoDictionary(displayID)?.takeRetainedValue() as NSDictionary? {

if let kDisplayYearOfManufacture = dictionary[kDisplayYearOfManufacture] as? Int64, let kDisplayWeekOfManufacture = dictionary[kDisplayWeekOfManufacture] as? Int64, let kDisplayVendorID = dictionary[kDisplayVendorID] as? Int64, let kDisplayProductID = dictionary[kDisplayProductID] as? Int64, let kDisplayVerticalImageSize = dictionary[kDisplayVerticalImageSize] as? Int64, let kDisplayHorizontalImageSize = dictionary[kDisplayHorizontalImageSize] as? Int64 {

struct KeyLoc {

var key: String

var loc: Int

}

let edidUUIDSearchKeys: [KeyLoc] = [

// Vendor ID

KeyLoc(key: String(format: "%04x", UInt16(max(0, min(kDisplayVendorID, 256 * 256 - 1)))).uppercased(), loc: 0),

// Product ID

KeyLoc(key: String(format: "%02x", UInt8((UInt16(max(0, min(kDisplayProductID, 256 * 256 - 1))) >> (0 * 8)) & 0xFF)).uppercased()

+ String(format: "%02x", UInt8((UInt16(max(0, min(kDisplayProductID, 256 * 256 - 1))) >> (1 * 8)) & 0xFF)).uppercased(), loc: 4),

// Manufacture date

KeyLoc(key: String(format: "%02x", UInt8(max(0, min(kDisplayWeekOfManufacture, 256 - 1)))).uppercased()

+ String(format: "%02x", UInt8(max(0, min(kDisplayYearOfManufacture - 1990, 256 - 1)))).uppercased(), loc: 19),

// Image size

KeyLoc(key: String(format: "%02x", UInt8(max(0, min(kDisplayHorizontalImageSize / 10, 256 - 1)))).uppercased()

+ String(format: "%02x", UInt8(max(0, min(kDisplayVerticalImageSize / 10, 256 - 1)))).uppercased(), loc: 30),

]

for searchKey in edidUUIDSearchKeys where searchKey.key != "0000" && searchKey.key == ioregEdidUUID.prefix(searchKey.loc + 4).suffix(4) {

matchScore += 1

}

if ioDisplayLocation != "", let kIODisplayLocation = dictionary[kIODisplayLocationKey] as? String, ioDisplayLocation == kIODisplayLocation {

matchScore += 10

}

if ioregProductName != "", let nameList = dictionary["DisplayProductName"] as? [String: String], let name = nameList["en_US"] ?? nameList.first?.value, name.lowercased() == ioregProductName.lowercased() {

matchScore += 1

}

if ioregSerialNumber != 0, let serial = dictionary[kDisplaySerialNumber] as? Int64, serial == ioregSerialNumber {

matchScore += 1

}

return matchScore

}

static func ioregIterateToNextObjectOfInterest(interests: [String], iterator: inout io_iterator_t) -> (name: String, entry: io_service_t, preceedingEntry: io_service_t)? {

var entry: io_service_t = IO_OBJECT_NULL

var preceedingEntry: io_service_t = IO_OBJECT_NULL

let name = UnsafeMutablePointer<CChar>.allocate(capacity: MemoryLayout<io_name_t>.size)

defer {

name.deallocate()

}

while true {

preceedingEntry = entry

entry = IOIteratorNext(iterator)

guard IORegistryEntryGetName(entry, name) == KERN_SUCCESS, entry != MACH_PORT_NULL else {

break

}

let nameString = String(cString: name)

for interest in interests where entry != IO_OBJECT_NULL && nameString.contains(interest) {

return (nameString, entry, preceedingEntry)

}

return nil

}

static func getIORegServiceAppleCDC2Properties(entry: io_service_t) -> IOregService {

var ioregService = IOregService()

if let unmanagedEdidUUID = IORegistryEntryCreateCFProperty(entry, "EDID UUID" as CFString, kCFAllocatorDefault, IOOptionBits(kIORegistryIterateRecursively)), let edidUUID = unmanagedEdidUUID.takeRetainedValue() as? String {

ioregService.edidUUID = edidUUID

}

let cpath = UnsafeMutablePointer<CChar>.allocate(capacity: MemoryLayout<io_string_t>.size)

IORegistryEntryGetPath(entry, kIOServicePlane, cpath)

ioregService.ioDisplayLocation = String(cString: cpath)

if let unmanagedDisplayAttrs = IORegistryEntryCreateCFProperty(entry, "DisplayAttributes" as CFString, kCFAllocatorDefault, IOOptionBits(kIORegistryIterateRecursively)), let displayAttrs = unmanagedDisplayAttrs.takeRetainedValue() as? NSDictionary {

ioregService.displayAttributes = displayAttrs

if let productAttrs = displayAttrs.value(forKey: "ProductAttributes") as? NSDictionary {

if let manufacturerID = productAttrs.value(forKey: "ManufacturerID") as? String {

ioregService.manufacturerID = manufacturerID

}

if let productName = productAttrs.value(forKey: "ProductName") as? String {

ioregService.productName = productName

}

if let serialNumber = productAttrs.value(forKey: "SerialNumber") as? Int64 {

ioregService.serialNumber = serialNumber

}

if let alphanumericSerialNumber = productAttrs.value(forKey: "AlphanumericSerialNumber") as? String {

ioregService.alphanumericSerialNumber = alphanumericSerialNumber

}

if let unmanagedTransport = IORegistryEntryCreateCFProperty(entry, "Transport" as CFString, kCFAllocatorDefault, IOOptionBits(kIORegistryIterateRecursively)), let transport = unmanagedTransport.takeRetainedValue() as? NSDictionary {

if let upstream = transport.value(forKey: "Upstream") as? String {

ioregService.transportUpstream = upstream

}

if let downstream = transport.value(forKey: "Downstream") as? String {

ioregService.transportDownstream = downstream

}

return ioregService

}

static func setIORegServiceDCPAVServiceProxy(entry: io_service_t, ioregService: inout IOregService) {

if let unmanagedLocation = IORegistryEntryCreateCFProperty(entry, "Location" as CFString, kCFAllocatorDefault, IOOptionBits(kIORegistryIterateRecursively)), let location = unmanagedLocation.takeRetainedValue() as? String {

ioregService.location = location

if location == "External" {

ioregService.service = IOAVServiceCreateWithService(kCFAllocatorDefault, entry)?.takeRetainedValue() as IOAVService

}

static func getIoregServicesForMatching() -> [IOregService] {

var serviceLocation = 0

var ioregServicesForMatching: [IOregService] = []

let ioregRoot: io_registry_entry_t = IORegistryGetRootEntry(kIOMasterPortDefault)

defer {

IOObjectRelease(ioregRoot)

}

var iterator = io_iterator_t()

defer {

IOObjectRelease(iterator)

}

var ioregService = IOregService()

guard IORegistryEntryCreateIterator(ioregRoot, "IOService", IOOptionBits(kIORegistryIterateRecursively), &iterator) == KERN_SUCCESS else {

return ioregServicesForMatching

}

let keyDCPAVServiceProxy = "DCPAVServiceProxy"

let keysFramebuffer = ["AppleCLCD2", "IOMobileFramebufferShim"]

while true {

guard let objectOfInterest = ioregIterateToNextObjectOfInterest(interests: [keyDCPAVServiceProxy] + keysFramebuffer, iterator: &iterator) else {

break

}

if keysFramebuffer.contains(objectOfInterest.name) {

ioregService = self.getIORegServiceAppleCDC2Properties(entry: objectOfInterest.entry)

serviceLocation += 1

ioregService.serviceLocation = serviceLocation

} else if objectOfInterest.name == keyDCPAVServiceProxy {

self.setIORegServiceDCPAVServiceProxy(entry: objectOfInterest.entry, ioregService: &ioregService)

ioregServicesForMatching.append(ioregService)

}

return ioregServicesForMatching

}

static func checkIfDummy(ioregService: IOregService) -> Bool {

if ioregService.manufacturerID == "AOC", ioregService.productName == "28E850" {

return true

}

return false

}

static func checkIfDiscouraged(ioregService _: IOregService) -> Bool {

false

}