🏃 Delivery Tracking Live Activity
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import ActivityKit

struct DeliveryAttributes: ActivityAttributes {
    // Static: 변경 불가
    let orderNumber: String
    let storeName: String
    
    // ContentState: 실시간 업데이트
    struct ContentState: Codable, Hashable {
        let status: DeliveryStatus
        let estimatedArrival: Date
        let driverName: String?
    }
}

enum DeliveryStatus: String, Codable {
    case preparing  // 준비 중
    case pickedUp   // 픽업 완료
    case nearby     // 근처 도착
    case delivered  // 배달 완료
}

struct DeliveryLiveActivity: Widget {
    var body: some WidgetConfiguration {
        ActivityConfiguration(for: DeliveryAttributes.self) { context in
            // 잠금 화면
            LockScreenView(context: context)
        } dynamicIsland: { context in
            DynamicIsland {
                // Expanded
                DynamicIslandExpandedRegion(.leading) {
                    Image(systemName: "person.circle")
                }
                DynamicIslandExpandedRegion(.trailing) {
                    Image(systemName: context.state.status.symbol)
                }
                DynamicIslandExpandedRegion(.center) {
                    Text(context.attributes.storeName)
                }
                DynamicIslandExpandedRegion(.bottom) {
                    ProgressView(value: context.state.progress)
                }
            } compactLeading: {
                Image(systemName: "bicycle")
            } compactTrailing: {
                Text(context.state.estimatedArrival, style: .timer)
            } minimal: {
                Image(systemName: "bicycle")
            }
        }
    }
}

struct LockScreenView: View {
    let context: ActivityViewContext<DeliveryAttributes>

    var body: some View {
        HStack(spacing: 12) {
            // 상태 아이콘
            Image(systemName: context.state.status.symbol)
                .font(.title2)
                .foregroundStyle(.blue)

            VStack(alignment: .leading, spacing: 4) {
                Text(context.attributes.storeName)
                    .font(.headline)

                Text(context.state.status.description)
                    .font(.caption)
                    .foregroundStyle(.secondary)

                // 도착 예정 시간
                Text(context.state.estimatedArrival, style: .relative)
                    .font(.caption2)
                    .foregroundStyle(.blue)
            }

            Spacer()

            // 진행률
            ProgressView(value: context.state.progress)
                .progressViewStyle(.circular)
        }
        .padding(16)
    }
}

class DeliveryActivityManager {
    private var currentActivity: Activity<DeliveryAttributes>?

    // 1. Activity 시작
    func startActivity(orderNumber: String, storeName: String) async throws {
        let attributes = DeliveryAttributes(
            orderNumber: orderNumber,
            storeName: storeName
        )

        let initialState = DeliveryAttributes.ContentState(
            status: .preparing,
            estimatedArrival: Date().addingTimeInterval(1800),
            driverName: nil
        )

        currentActivity = try Activity.request(
            attributes: attributes,
            content: ActivityContent(state: initialState, staleDate: nil),
            pushType: .token  // Push Notification 지원
        )
    }

    // 2. 상태 업데이트
    func updateStatus(_ status: DeliveryStatus, driverName: String? = nil) async {
        let newState = DeliveryAttributes.ContentState(
            status: status,
            estimatedArrival: Date().addingTimeInterval(600),
            driverName: driverName
        )

        await currentActivity?.update(
            ActivityContent(state: newState, staleDate: nil)
        )
    }

    // 3. Activity 종료
    func endActivity() async {
        let finalState = DeliveryAttributes.ContentState(
            status: .delivered,
            estimatedArrival: Date(),
            driverName: nil
        )

        await currentActivity?.end(
            ActivityContent(state: finalState, staleDate: nil),
            dismissalPolicy: .after(Date().addingTimeInterval(3600))  // 1시간 후 자동 제거
        )
    }
}

<key>NSSupportsLiveActivities</key>
<true/>

// Push Token 가져오기
for await pushToken in Activity<DeliveryAttributes>.pushToStartTokenUpdates {
    // 서버로 Push Token 전송
    await sendTokenToServer(pushToken)
}