import static java.lang.Math.max;
import static java.lang.Math.min;

public class TV implements RemoteControl {
  public TV(String make, int screensize) {
    this.make = make;
    this.screensize = screensize;
    // In practice you would probably have more
    // arguments to set the max and min channel
    // and volume here plus other characteristics for a particular TV.
  }

  public boolean powerOnOff() {
    power = !power;
    System.out.println(make + " "+ screensize + " inch TV power "
                    + (power ? "on.":"off."));
    return power;
  }

  public int volumeUp(int increment) {
    if(!power) {                                                       // If the power is off
      return 0;                                                        // Nothing works
    }

    // Set volume – must not be greater than the maximum
    volume += increment;
    volume = min(volume, MAX_VOLUME);
    System.out.println(make + " "+ screensize + " inch TV volume level: "
                     + volume);
    return volume;
  }

  public int volumeDown(int decrement) {
    if(!power) {                                                       // If the power is off
      return 0;                                                        // Nothing works
    }

    // Set volume – must not be less than the minimum
    volume -= decrement;
    volume = max(volume, MIN_VOLUME);
    System.out.println(make + " "+ screensize + " inch TV volume level: " + volume);
    return volume;
  }

  public void mute() {
    if(!power) {                                                       // If the power is off
      return;                                                          // Nothing works
    }

    volume = MIN_VOLUME;
    System.out.println(make + " "+ screensize + " inch TV volume level: " + volume);
  }

  public int setChannel(int newChannel) {
    if(!power) {                                                       // If the power is off
      return 0;                                                        // Nothing works
    }

    // Channel must be from MIN_CHANNEL to MAX_CHANNEL
    if(newChannel>=MIN_CHANNEL && newChannel<=MAX_CHANNEL)
      channel = newChannel;
    System.out.println(make + " "+ screensize + " inch TV tuned to channel: " + channel);
    return channel;
  }

  public int channelUp() {
    if(!power) {                                                       // If the power is off
      return 0;                                                        // Nothing works
    }

    // Wrap channel up to MIN_CHANNEL when MAX_CHANNEL is reached
    channel = channel<MAX_CHANNEL ? ++channel : MIN_CHANNEL;
    System.out.println(make + " "+ screensize + " inch TV tuned to channel: " + channel);
    return channel;
  }

  public int channelDown() {
    if(!power)  {                                                      // If the power is off
      return 0;                                                        // Nothing works
    }

    // Wrap channel down to MAX_CHANNEL when MIN_CHANNEL is reached
    channel = channel>MIN_CHANNEL ? --channel : MAX_CHANNEL;
    System.out.println(make + " "+ screensize + " inch TV tuned to channel: " + channel);
    return channel;
  }

  private String make = null;
  private int screensize = 0;
  private boolean power = false;

  private final int MIN_VOLUME = 0;
  private final int MAX_VOLUME = 100;
  private int volume = MIN_VOLUME;

  private final int MIN_CHANNEL = 0;
  private final int MAX_CHANNEL = 999;
  private int channel = MIN_CHANNEL;
}