import SwiftUI

public struct CalendarSettingsView: View {
  @AppStorage("calendar.timeZoneOverride") private var override = ""
  @AppStorage("calendar.showMenuBar") private var showMenuBar = true
  public init() {}
  public var body: some View {
    Form {
      #if os(macOS)
      Section { Toggle("Show calendar in menu bar", isOn: $showMenuBar) }
      #endif
      Section {
        Toggle("Use system time zone", isOn: Binding(
          get: { override.isEmpty },
          set: { override = $0 ? "" : TimeZone.current.identifier }))
        if override.isEmpty {
          LabeledContent("Time zone", value: TimeZone.current.identifier.replacingOccurrences(of: "_", with: " "))
        } else {
          Picker("Time zone", selection: $override) {
            ForEach(Array(Set(TimeZone.knownTimeZoneIdentifiers + ["UTC", TimeZone.current.identifier])).sorted(), id: \.self) { zone in
              Text(zone.replacingOccurrences(of: "_", with: " ")).tag(zone)
            }
          }
        }
      } footer: {
        Text("Used for your agenda, new events and quick-add on this device. Existing events keep their original time zones.")
      }
    }.formStyle(.grouped).navigationTitle("Calendar settings")
    #if os(macOS)
    .frame(width: 460, height: 300)
    #endif
  }
}