import Commanding
import SwiftUI
import WidgetKit

/// The timer of the elapsed recording time, formatted as `mm:ss`: counted up by the system from the content state's anchor when
/// one is given, and frozen at the reported elapsed time otherwise.
struct RecordingTimerText: View {

    // MARK: Properties

    /// The dynamic content of the Live Activity to render.
    let state: RecordingActivityAttributes.ContentState

    // MARK: Body

    var body: some View {
        if let anchor = state.anchor {
            Text(
                .durationOffset(to: anchor),
                format: timerFormat
            )
            .multilineTextAlignment(.center)
        }
        else {
            Text(
                Duration
                    .seconds(state.elapsed)
                    .formatted(timerFormat)
            )
        }
    }

}

// MARK: - Helpers

private extension RecordingTimerText {

    // MARK: Properties

    /// The format of the timer: minutes and seconds, as `mm:ss`.
    var timerFormat: Duration.TimeFormatStyle {
        .time(pattern: .minuteSecond(padMinuteToLength: 2))
    }

}

// MARK: - Previews

#Preview(
    "Recording Timer text",
    as: .dynamicIsland(.compact),
    using: RecordingActivityAttributes()
) {
    RecordingLiveActivity()
} contentStates: {
    RecordingActivityAttributes.ContentState(
        state: .recording,
        anchor: .now,
        elapsed: 0
    )
    RecordingActivityAttributes.ContentState(
        state: .paused,
        anchor: nil,
        elapsed: 325
    )
    RecordingActivityAttributes.ContentState(
        state: .processing,
        anchor: nil,
        elapsed: 325
    )
}