Strategy Game Timeline Sample

struct Provider: TimelineProvider {
    func placeholder(in context: Context) -> SimpleEntry {
        SimpleEntry(date: Date(), building: .barrack)
    }

    func getSnapshot(in context: Context, completion: @escaping (SimpleEntry) -> ()) {
        let entry = SimpleEntry(date: Date(), building: .barrack)
        completion(entry)
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<Entry>) -> ()) {
        let endDate = selectedBuilding.completionDate
        let oneMinute: TimeInterval = 60
        var currentDate = Date()
        var entries: [SimpleEntry] = []
        
        while currentDate < endDate {
            let progress = selectedBuilding.getCurrentProgress(startDate, endDate)
            let entry = SimpleEntry(date: currentDate, progress: progress)
            
            currentDate += oneMinute
            entries.append(entry)
        }
        
        let timeline = Timeline(entries: entries, policy: .atEnd)
        
        completion(timeline)
    }
}