import BackgroundTasks
import Foundation

enum BackgroundRefreshService {
    static let taskIdentifier = "com.danghuaiyu.ShaanxiUnionMonitor.refresh"

    static func register() {
        BGTaskScheduler.shared.register(forTaskWithIdentifier: taskIdentifier, using: nil) { task in
            guard let refreshTask = task as? BGAppRefreshTask else {
                task.setTaskCompleted(success: false)
                return
            }
            handle(refreshTask)
        }
    }

    static func schedule() {
        let request = BGAppRefreshTaskRequest(identifier: taskIdentifier)
        request.earliestBeginDate = Date(timeIntervalSinceNow: 10)
        try? BGTaskScheduler.shared.submit(request)
    }

    private static func handle(_ task: BGAppRefreshTask) {
        schedule()

        let runner = Task {
            do {
                _ = try await VideoCheckService().checkForCSVChange(sendNotification: false)
                task.setTaskCompleted(success: true)
            } catch {
                task.setTaskCompleted(success: false)
            }
        }

        task.expirationHandler = {
            runner.cancel()
        }
    }
}