import WidgetKit
import SwiftUI
import UIKit

struct BanYaroEntry: TimelineEntry {
    let date: Date
    let data: HomeWidgetData?
}

struct BanYaroProvider: TimelineProvider {
    func placeholder(in context: Context) -> BanYaroEntry {
        BanYaroEntry(date: Date(), data: nil)
    }

    func getSnapshot(in context: Context, completion: @escaping (BanYaroEntry) -> Void) {
        completion(BanYaroEntry(date: Date(), data: HomeWidgetStore.load()))
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<BanYaroEntry>) -> Void) {
        let entry = BanYaroEntry(date: Date(), data: HomeWidgetStore.load())
        // Die App pusht bei Updates reloadAllTimelines(); als Sicherheitsnetz
        // stündlich neu laden.
        let next = Calendar.current.date(byAdding: .hour, value: 1, to: Date())
            ?? Date().addingTimeInterval(3600)
        completion(Timeline(entries: [entry], policy: .after(next)))
    }
}

struct BanYaroHomeWidgetEntryView: View {
    @Environment(\.widgetFamily) private var family
    let entry: BanYaroEntry

    var body: some View {
        VStack(alignment: .leading, spacing: 4) {
            Spacer()
            Text(entry.data?.dogName ?? "Ban Yaro")
                .font(family == .systemSmall ? .headline : .title3)
                .bold()
                .foregroundStyle(.white)
                .shadow(radius: 3)
            if family != .systemSmall {
                if let appt = entry.data?.nextAppointment, !appt.isEmpty {
                    Label(appt, systemImage: "calendar")
                        .font(.caption)
                        .foregroundStyle(.white)
                        .shadow(radius: 3)
                } else if let n = entry.data?.diaryCount, n > 0 {
                    Label("\(n) Tagebuch-Einträge", systemImage: "book")
                        .font(.caption)
                        .foregroundStyle(.white.opacity(0.9))
                        .shadow(radius: 3)
                } else {
                    Text("Schön, dass du da bist 🐾")
                        .font(.caption)
                        .foregroundStyle(.white.opacity(0.9))
                        .shadow(radius: 3)
                }
            }
        }
        .frame(maxWidth: .infinity, alignment: .leading)
    }
}

struct BanYaroHomeWidget: Widget {
    let kind = "BanYaroHomeWidget"

    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: BanYaroProvider()) { entry in
            BanYaroHomeWidgetEntryView(entry: entry)
                .containerBackground(for: .widget) {
                    if let jpeg = entry.data?.photoJPEG, let ui = UIImage(data: jpeg) {
                        ZStack {
                            Image(uiImage: ui).resizable().scaledToFill()
                            LinearGradient(
                                colors: [.black.opacity(0.0), .black.opacity(0.55)],
                                startPoint: .center, endPoint: .bottom
                            )
                        }
                    } else {
                        Color.accentColor.opacity(0.25)
                    }
                }
        }
        .configurationDisplayName("Ban Yaro")
        .description("Tagesfoto deines Hundes und nächster Termin.")
        .supportedFamilies([.systemSmall, .systemMedium])
    }
}