import WidgetKit
import SwiftUI

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

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

    func getTimeline(in context: Context, completion: @escaping (Timeline<SimpleEntry>) -> Void) {
        var entries: [SimpleEntry] = []
        let currentDate = Date()
        for hourOffset in 0 ..< 5 {
            let entryDate = Calendar.current.date(byAdding: .hour, value: hourOffset, to: currentDate)!
            let entry = SimpleEntry(date: entryDate)
            entries.append(entry)
        }
        let timeline = Timeline(entries: entries, policy: .atEnd)
        completion(timeline)
    }
}

struct SimpleEntry: TimelineEntry {
    let date: Date
}

struct PlatformWidgetEntryView: View {
    var entry: Provider.Entry

    var body: some View {
        VStack {
            Text("Platform")
                .font(.headline)
            Text(entry.date, style: .time)
                .font(.caption)
        }
    }
}

struct PlatformWidget: Widget {
    let kind: String = "PlatformWidget"

    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: Provider()) { entry in
            PlatformWidgetEntryView(entry: entry)
                .containerBackground(.fill.tertiary, for: .widget)
        }
        .configurationDisplayName("Platform")
        .description("Platform widget.")
        .supportedFamilies([.systemSmall, .systemMedium])
    }
}

#Preview(as: .systemSmall) {
    PlatformWidget()
} timeline: {
    SimpleEntry(date: .now)
}