// Example 2 — Weather Station domain demo of Slice with Lambda (C#)
//
// Condensed mechanics: https://sammancoaching.org/refactorings/slice.html
// (where that page says mock, we use a lambda instead).
//
// Cast (Head First Design Patterns Weather Station, reduced):
//   LightSensor      — hardware-ish dependency. Read() returns a byte.
//   SunExposure      — enum. Reading > 128 => Sunny, otherwise Shady.
//   WateringDuration — enum. None / Medium / Short.
//                      (Long is YAGNI until the for-loop version of this
//                      exercise exists.)
//   SprinklerController — the client. Owns the _wateredToday flag, so the
//                      guard is about client state, not sensor state.

using System;

public enum SunExposure
{
    Shady,
    Sunny
}

public enum WateringDuration
{
    None,
    Medium,
    Short
}

public class LightSensor
{
    private readonly Random _rng = new Random();    // stand-in for hardware noise

    public byte Read()
    {
        return (byte)_rng.Next(256);
    }
}

public class SprinklerController
{
    private readonly LightSensor _lightSensor;
    private bool _wateredToday;                     // event-style client state

    public SprinklerController(LightSensor lightSensor)
    {
        _lightSensor = lightSensor;
    }

    public WateringDuration ScheduleWatering()
    {
        if (_wateredToday)                          // guard: client state, stays
        {
            return WateringDuration.None;
        }

        _wateredToday = true;                       // set only after watering
        byte reading = _lightSensor.Read();         // middle: unwanted dependency
        SunExposure exposure = ToSunExposure(reading);
        if (exposure == SunExposure.Sunny)          // tail: complex behaviour below
        {                                           // the extraction point
            return WateringDuration.Medium;
        }
        return WateringDuration.Short;
    }

    private static SunExposure ToSunExposure(byte reading)
    {
        return reading > 128 ? SunExposure.Sunny : SunExposure.Shady;
    }
}