onyx/Onyx/WidgetOptionsView.swift

import SwiftUI
import CalendarProvider
import WeatherProvider
import ShelfProvider

/// Die Stellschrauben der einzelnen Widgets, an einem Ort.
///
/// Vorher hieß der Bereich „Quellen" und enthielt nur die Kalenderquelle. Das
/// war die Sicht des Programmierers: für den Nutzer ist die Quelle eine
/// Einstellung **des Kalenderwidgets** unter mehreren — welche Kalender
/// mitzählen, gehört genauso dazu, und beim Wetter der Ort. Ein Abschnitt je
/// Widget ist die Ordnung, die man sucht.
struct WidgetOptionsView: View {
    let calendarModel: CalendarModel
    let weatherModel: WeatherModel
    let shelfStore: ShelfStore?

    var body: some View {
        Form {
            Section("options.calendar") {
                CalendarOptions(model: calendarModel)
            }

            Section("options.weather") {
                WeatherOptions(model: weatherModel)
            }

            if let shelfStore {
                Section("options.shelf") {
                    ShelfOptions(store: shelfStore)
                }
            }
        }
        .formStyle(.grouped)
        .padding()
    }
}

// MARK: - Kalender

private struct CalendarOptions: View {
    @Bindable var model: CalendarModel
    @State private var calendarrState: CalendarSourceState?

    var body: some View {
        Picker(selection: $model.kind) {
            ForEach(CalendarSourceKind.allCases, id: \.self) { kind in
                Text(kind.localizedName).tag(kind)
            }
        } label: {
            Text("options.calendar.source")
        }
        .pickerStyle(.menu)

        Picker(selection: $model.showsMonthGrid) {
            Text("options.calendar.agenda").tag(false)
            Text("options.calendar.month").tag(true)
        } label: {
            Text("options.calendar.display")
        }
        .pickerStyle(.menu)

        // Welche Kalender mitzählen. Gespeichert werden die **abgewählten**:
        // kommt ein neuer dazu, ist er automatisch dabei, statt dass man ihn
        // suchen muss, ohne zu wissen, dass es ihn gibt.
        if model.availableCalendars.isEmpty {
            Text("options.calendar.noneFound")
                .font(.callout).foregroundStyle(.secondary)
        } else {
            ForEach(model.availableCalendars) { calendar in
                Toggle(isOn: Binding(
                    get: { !model.hiddenCalendarIDs.contains(calendar.id) },
                    set: { shown in
                        if shown { model.hiddenCalendarIDs.remove(calendar.id) }
                        else { model.hiddenCalendarIDs.insert(calendar.id) }
                    })) {
                        Label {
                            Text(calendar.title)
                        } icon: {
                            Circle()
                                .fill(Color(hex: calendar.colorHex) ?? .secondary)
                                .frame(width: 9, height: 9)
                        }
                    }
            }
        }

        if model.kind != .appleCalendar {
            CalendarrStatus(state: calendarrState)
                .task(id: model.kind) {
                    guard model.kind != .appleCalendar else { return }
                    let now = Date()
                    calendarrState = await CalendarrSource().load(
                        DateInterval(start: now.addingTimeInterval(-14 * 86_400),
                                     end: now.addingTimeInterval(60 * 86_400)))
                }
        }
    }
}

/// Was Calendarr gerade liefert. Bleibt das Widget leer, steht hier das Warum.
private struct CalendarrStatus: View {
    let state: CalendarSourceState?

    var body: some View {
        switch state {
        case .ready(let window):
            LabeledContent {
                Text(window.asOf?.formatted(date: .abbreviated, time: .shortened) ?? "–")
                    .foregroundStyle(.secondary)
            } label: {
                Text("options.calendar.calendarrEvents \(window.events.count)")
            }
        case .neverWritten:
            Text("calendar.source.status.neverWritten").font(.callout).foregroundStyle(.secondary)
        case .loggedOut:
            Text("calendar.source.status.loggedOut").font(.callout).foregroundStyle(.secondary)
        case .incompatible:
            Text("calendar.source.status.incompatible").font(.callout).foregroundStyle(.orange)
        case .unreadable(let reason):
            Text(reason).font(.callout).foregroundStyle(.orange)
        case .denied, .none:
            ProgressView().controlSize(.small)
        }
    }
}

// MARK: - Wetter

private struct WeatherOptions: View {
    let model: WeatherModel
    @State private var query = ""
    @State private var searching = false
    @State private var notFound = false

    private var usesCurrentLocation: Bool { model.place.isCurrent }

    var body: some View {
        Toggle(isOn: Binding(
            get: { usesCurrentLocation },
            set: { model.place = $0 ? .current : model.place })) {
                Text("options.weather.automatic")
            }
            .disabled(usesCurrentLocation)

        if usesCurrentLocation {
            // Ohne Ortungsberechtigung nützt die Automatik nichts — und das
            // steht hier, statt dass das Widget stumm leer bleibt.
            if model.locationIsDenied {
                Text("options.weather.needsLocation")
                    .font(.callout).foregroundStyle(.orange)
                    .fixedSize(horizontal: false, vertical: true)
            }
        } else if case .fixed(let name, _, _) = model.place {
            LabeledContent {
                Text(name).foregroundStyle(.secondary)
            } label: {
                Text("options.weather.place")
            }
        }

        HStack {
            TextField("options.weather.search", text: $query)
                .textFieldStyle(.roundedBorder)
                .onSubmit { Task { await search() } }
            if searching {
                ProgressView().controlSize(.small)
            } else {
                Button("options.weather.set") { Task { await search() } }
                    .disabled(query.trimmingCharacters(in: .whitespaces).isEmpty)
            }
        }

        if notFound {
            Text("options.weather.notFound").font(.callout).foregroundStyle(.orange)
        }
    }

    private func search() async {
        searching = true
        notFound = false
        defer { searching = false }
        if let found = await model.selectPlace(named: query) {
            query = ""
            _ = found
        } else {
            notFound = true
        }
    }
}

// MARK: - Ablage

private struct ShelfOptions: View {
    @Bindable var store: ShelfStore

    private static let choices: [Int?] = [nil, 1, 7, 30, 90]

    var body: some View {
        Picker(selection: $store.autoCleanupDays) {
            ForEach(Self.choices, id: \.self) { days in
                if let days {
                    Text("settings.shelf.days \(days)").tag(Optional(days))
                } else {
                    Text("settings.shelf.never").tag(Int?.none)
                }
            }
        } label: {
            Text("settings.shelf.cleanup")
        }

        HStack {
            Text("settings.shelf.count \(store.items.count)").foregroundStyle(.secondary)
            Spacer()
            Button("settings.shelf.reveal") { store.revealInFinder() }
                .buttonStyle(.borderless)
        }
    }
}

private extension Color {
    /// Die Farbe eines Kalenders, wie die Quelle sie liefert.
    init?(hex: String?) {
        guard let hex, hex.hasPrefix("#"), hex.count == 7,
              let value = Int(hex.dropFirst(), radix: 16) else { return nil }
        self.init(red: Double((value >> 16) & 0xFF) / 255,
                  green: Double((value >> 8) & 0xFF) / 255,
                  blue: Double(value & 0xFF) / 255)
    }
}