struct CompactCountdownFormatStyle: DiscreteFormatStyle {
    func discreteInput(before input: Duration) -> Duration? {
        // This should be the upper bound of the countdown, in other words, what's the highest start time
        // we support.

        // If our input it already a minute or less then that's our cap
        guard input > .seconds(60) else { return nil }

        // Since our boundary is minutes, what the next minute smaller than our input?
        let minutes = Int(input.components.seconds) / 60

        if minutes <= 1 {
            return nil
        } else {
            return .seconds((minutes - 1) * 60)
        }
    }

    func discreteInput(after input: Duration) -> Duration? {
        if input > .seconds(60 * 60 * 8) {
            return nil
        } else {
            // One minute over the given duration?
            return input + .seconds(60)
        }
    }

    func format(_ value: Duration) -> String {
        let hoursRemaining = Int(value.components.seconds) / 60 / 60
        let minutesRemaining = Int(value.components.seconds) / 60 % 60

        if hoursRemaining > 0 {
            return "\(hoursRemaining):\(minutesRemaining.formatted(.number.precision(.integerLength(2))))h"
        } else {
            return "\(minutesRemaining)m"
        }
    }
}