# HomeKit + Matter Extended Patterns

Overflow reference for the `homekit-matter` skill. Contains advanced patterns
that exceed the main skill file's scope.

## Contents

- [SwiftUI HomeKit Integration](#swiftui-homekit-integration)
- [Full Delegate Wiring](#full-delegate-wiring)
- [Service Type Discovery](#service-type-discovery)
- [Advanced Matter Extension Handler](#advanced-matter-extension-handler)
- [Testing with HomeKit Accessory Simulator](#testing-with-homekit-accessory-simulator)

## SwiftUI HomeKit Integration

### HomeKit Store with @Observable

```swift
import HomeKit
import SwiftUI

@Observable
@MainActor
final class HomeStore: NSObject {
    static let shared = HomeStore()

    let homeManager = HMHomeManager()

    var homes: [HMHome] = []
    var primaryHome: HMHome?
    var isAuthorized = false

    override init() {
        super.init()
        homeManager.delegate = self
    }

    var accessories: [HMAccessory] {
        primaryHome?.accessories ?? []
    }

    var rooms: [HMRoom] {
        primaryHome?.rooms ?? []
    }

    func addHome(name: String) async throws {
        try await withCheckedThrowingContinuation { (continuation: CheckedContinuation<Void, Error>) in
            homeManager.addHome(withName: name) { home, error in
                if let error {
                    continuation.resume(throwing: error)
                } else {
                    continuation.resume()
                }
            }
        }
    }
}

extension HomeStore: HMHomeManagerDelegate {
    nonisolated func homeManagerDidUpdateHomes(_ manager: HMHomeManager) {
        Task { @MainActor in
            homes = manager.homes
            primaryHome = manager.primaryHome
        }
    }

    nonisolated func homeManager(
        _ manager: HMHomeManager,
        didUpdate status: HMHomeManagerAuthorizationStatus
    ) {
        Task { @MainActor in
            isAuthorized = status.contains(.authorized)
        }
    }

    nonisolated func homeManager(
        _ manager: HMHomeManager,
        didAdd home: HMHome
    ) {
        Task { @MainActor in
            homes = manager.homes
        }
    }

    nonisolated func homeManager(
        _ manager: HMHomeManager,
        didRemove home: HMHome
    ) {
        Task { @MainActor in
            homes = manager.homes
        }
    }
}
```

### Accessory List View

```swift
struct AccessoryListView: View {
    @State private var homeStore = HomeStore.shared

    var body: some View {
        NavigationStack {
            Group {
                if !homeStore.isAuthorized {
                    ContentUnavailableView(
                        "HomeKit Access Required",
                        systemImage: "house.fill",
                        description: Text("Grant access in Settings to manage your home.")
                    )
                } else if homeStore.accessories.isEmpty {
                    ContentUnavailableView(
                        "No Accessories",
                        systemImage: "lightbulb",
                        description: Text("Add accessories using the Home app.")
                    )
                } else {
                    accessoryList
                }
            }
            .navigationTitle(homeStore.primaryHome?.name ?? "Home")
        }
    }

    private var accessoryList: some View {
        List {
            ForEach(homeStore.rooms, id: \.uniqueIdentifier) { room in
                Section(room.name) {
                    let roomAccessories = homeStore.accessories.filter {
                        $0.room?.uniqueIdentifier == room.uniqueIdentifier
                    }
                    ForEach(roomAccessories, id: \.uniqueIdentifier) { accessory in
                        AccessoryRow(accessory: accessory)
                    }
                }
            }
        }
    }
}

struct AccessoryRow: View {
    let accessory: HMAccessory

    var body: some View {
        HStack {
            Image(systemName: iconName)
            VStack(alignment: .leading) {
                Text(accessory.name)
                    .font(.headline)
                Text(accessory.isReachable ? "Reachable" : "Not Reachable")
                    .font(.caption)
                    .foregroundStyle(accessory.isReachable ? .green : .secondary)
            }
        }
    }

    private var iconName: String {
        switch accessory.category.categoryType {
        case HMAccessoryCategoryTypeLightbulb: return "lightbulb.fill"
        case HMAccessoryCategoryTypeThermostat: return "thermometer"
        case HMAccessoryCategoryTypeLock: return "lock.fill"
        case HMAccessoryCategoryTypeSwitch: return "light.switch.2"
        default: return "house.fill"
        }
    }
}
```

### Light Control View

```swift
struct LightControlView: View {
    let accessory: HMAccessory

    @State private var isOn = false
    @State private var brightness: Double = 100

    private var lightbulbService: HMService? {
        accessory.services.first {
            $0.serviceType == HMServiceTypeLightbulb
        }
    }

    private var powerCharacteristic: HMCharacteristic? {
        lightbulbService?.characteristics.first {
            $0.characteristicType == HMCharacteristicTypePowerState
        }
    }

    private var brightnessCharacteristic: HMCharacteristic? {
        lightbulbService?.characteristics.first {
            $0.characteristicType == HMCharacteristicTypeBrightness
        }
    }

    var body: some View {
        VStack(spacing: 20) {
            Toggle("Power", isOn: $isOn)
                .onChange(of: isOn) { _, newValue in
                    powerCharacteristic?.writeValue(newValue) { _ in }
                }

            if isOn {
                Slider(value: $brightness, in: 0...100, step: 1)
                    .onChange(of: brightness) { _, newValue in
                        brightnessCharacteristic?.writeValue(
                            Int(newValue)
                        ) { _ in }
                    }
                Text("Brightness: \(Int(brightness))%")
            }
        }
        .padding()
        .task { await readCurrentState() }
    }

    private func readCurrentState() async {
        powerCharacteristic?.readValue { _ in
            if let value = powerCharacteristic?.value as? Bool {
                isOn = value
            }
        }
        brightnessCharacteristic?.readValue { _ in
            if let value = brightnessCharacteristic?.value as? Int {
                brightness = Double(value)
            }
        }
    }
}
```

## Full Delegate Wiring

### HMHomeDelegate

```swift
extension HomeStore: HMHomeDelegate {
    nonisolated func home(
        _ home: HMHome,
        didAdd accessory: HMAccessory
    ) {
        accessory.delegate = self
        Task { @MainActor in
            // Refresh accessory list
        }
    }

    nonisolated func home(
        _ home: HMHome,
        didRemove accessory: HMAccessory
    ) {
        Task { @MainActor in
            // Refresh accessory list
        }
    }

    nonisolated func home(
        _ home: HMHome,
        didAdd room: HMRoom
    ) {
        Task { @MainActor in
            // Refresh room list
        }
    }

    nonisolated func home(
        _ home: HMHome,
        didUpdateNameFor room: HMRoom
    ) {
        Task { @MainActor in
            // Update room name display
        }
    }
}
```

### HMAccessoryDelegate

```swift
extension HomeStore: HMAccessoryDelegate {
    nonisolated func accessory(
        _ accessory: HMAccessory,
        service: HMService,
        didUpdateValueFor characteristic: HMCharacteristic
    ) {
        Task { @MainActor in
            // Update UI for the changed characteristic
            let newValue = characteristic.value
            print("\(accessory.name).\(characteristic.characteristicType) = \(newValue ?? "nil")")
        }
    }

    nonisolated func accessoryDidUpdateReachability(
        _ accessory: HMAccessory
    ) {
        Task { @MainActor in
            print("\(accessory.name) reachable: \(accessory.isReachable)")
        }
    }

    nonisolated func accessoryDidUpdateName(
        _ accessory: HMAccessory
    ) {
        Task { @MainActor in
            // Refresh name display
        }
    }
}
```

## Service Type Discovery

### Finding Specific Service Types

```swift
// Find all thermostats in the home
let thermostats = home.servicesWithTypes([HMServiceTypeThermostat]) ?? []

for service in thermostats {
    let currentTemp = service.characteristics.first {
        $0.characteristicType == HMCharacteristicTypeCurrentTemperature
    }
    let targetTemp = service.characteristics.first {
        $0.characteristicType == HMCharacteristicTypeTargetTemperature
    }

    currentTemp?.readValue { _ in
        print("Current: \(currentTemp?.value ?? "?")")
    }
}
```

### Common Service Types

| Constant | Description |
|---|---|
| `HMServiceTypeLightbulb` | Light control (on/off, brightness, color) |
| `HMServiceTypeThermostat` | Temperature control |
| `HMServiceTypeLockMechanism` | Door lock |
| `HMServiceTypeGarageDoorOpener` | Garage door |
| `HMServiceTypeSwitch` | Generic on/off switch |
| `HMServiceTypeMotionSensor` | Motion detection |
| `HMServiceTypeTemperatureSensor` | Temperature reading |
| `HMServiceTypeContactSensor` | Door/window open/close |

### Common Characteristic Types

| Constant | Value Type | Description |
|---|---|---|
| `HMCharacteristicTypePowerState` | Bool | On/off |
| `HMCharacteristicTypeBrightness` | Int (0-100) | Light brightness |
| `HMCharacteristicTypeHue` | Float (0-360) | Light hue |
| `HMCharacteristicTypeSaturation` | Float (0-100) | Light saturation |
| `HMCharacteristicTypeCurrentTemperature` | Float | Celsius reading |
| `HMCharacteristicTypeTargetTemperature` | Float | Celsius target |
| `HMCharacteristicTypeLockCurrentState` | Int | Lock state (0=unsecured) |
| `HMCharacteristicTypeLockTargetState` | Int | Lock target state |

## Advanced Matter Extension Handler

### Full Handler with Network Selection

```swift
import MatterSupport

final class MyMatterHandler: MatterAddDeviceExtensionRequestHandler {

    override func validateDeviceCredential(
        _ deviceCredential: DeviceCredential
    ) async throws {
        // Validate the Device Attestation Certificate (DAC) against
        // your Product Attestation Authority (PAA) root certificates.
        let dac = deviceCredential.deviceAttestationCertificate
        let pai = deviceCredential.productAttestationIntermediateCertificate
        let cd = deviceCredential.certificationDeclaration

        // If validation fails, throw an error to reject the device
        guard isValidCertificateChain(dac: dac, pai: pai, cd: cd) else {
            throw MatterCommissioningError.invalidCredential
        }
    }

    override func rooms(
        in home: MatterAddDeviceRequest.Home?
    ) async -> [MatterAddDeviceRequest.Room] {
        // Fetch rooms from your backend for the given home
        guard let home else { return [] }

        let roomNames = await fetchRoomsFromBackend(homeName: home.displayName)
        return roomNames.map { MatterAddDeviceRequest.Room(displayName: $0) }
    }

    override func configureDevice(
        named name: String,
        in room: MatterAddDeviceRequest.Room?
    ) async {
        // Save device configuration to your ecosystem backend
        await saveDeviceToBackend(
            deviceName: name,
            roomName: room?.displayName
        )
    }

    override func commissionDevice(
        in home: MatterAddDeviceRequest.Home?,
        onboardingPayload: String,
        commissioningID: UUID
    ) async throws {
        // Commission the device into your Matter fabric
        // using the Matter framework (MTRDeviceController)
        try await commissionToFabric(
            payload: onboardingPayload,
            commissioningID: commissioningID
        )
    }

    override func selectWiFiNetwork(
        from networks: [WiFiScanResult]
    ) async throws -> WiFiNetworkAssociation {
        // Use the system default network or specify one
        return .defaultSystemNetwork
    }

    override func selectThreadNetwork(
        from networks: [ThreadScanResult]
    ) async throws -> ThreadNetworkAssociation {
        return .defaultSystemNetwork
    }
}
```

## Testing with HomeKit Accessory Simulator

1. Download **Additional Tools for Xcode** from Apple's developer downloads page
2. Launch **HomeKit Accessory Simulator**
3. Create simulated accessories (lights, locks, sensors)
4. Pair them with your app running in Simulator or on device

```swift
// Enable verbose logging during development
#if DEBUG
import os
let homeKitLog = Logger(subsystem: "com.example.app", category: "HomeKit")

func logAccessories() {
    guard let home = homeManager.primaryHome else { return }
    for accessory in home.accessories {
        homeKitLog.debug("Accessory: \(accessory.name), reachable: \(accessory.isReachable)")
        for service in accessory.services {
            homeKitLog.debug("  Service: \(service.localizedDescription ?? service.serviceType)")
        }
    }
}
#endif
```
