using System;

  using System.Collections.Generic;

  namespace StatePattern {

    // State Pattern               D-J Miller and Judith Bishop  Sept 2007

    // Simple game where the context changes the state based on user input

    // Has four states, each with 6 operations

      

    abstract class IState {

      public virtual string Move(Context context) {return "";}

      public virtual string Attack(Context context) {return "";}

      public virtual string Stop(Context context) {return "";}

      public virtual string Run(Context context) {return "";}

      public virtual string Panic(Context context) {return "";}

      public virtual string CalmDown(Context context) {return "";}

    }

    // There are four States

    class RestingState : IState {

      public override string Move(Context context) {

        context.State = new MovingState();

        return "You start moving";

      }

      public override string Attack(Context context) {

        context.State = new AttackingState();

        return "You start attacking the darkness";

      }

      public override string Stop(Context context) {

        return "You are already stopped!";

      }

      public override string Run(Context context) {

        return "You cannot run unless you are moving";

      }

      public override string Panic(Context context) {

        context.State = new PanickingState();

        return "You start Panicking and begin seeing things";

      }

      public override string CalmDown(Context context) {

        return "You are already relaxed";

      }

    }

  class AttackingState : IState {

    public override string Move(Context context) {

      return "You need to stop attacking first";

    }

    public override string Attack(Context context) {

      return "You attack the darkness for " +

           (new Random().Next(20) + 1) + " damage";

    }

    public override string Stop(Context context) {

      context.State = new RestingState();

      return "You are calm down and come to rest";

    }

    public override string Run(Context context) {

      context.State = new MovingState();

      return "You Run away from the fray";

    }

     public override string Panic(Context context) {

       context.State = new PanickingState();

       return "You start Panicking and begin seeing things";

    }

    public override string CalmDown(Context context) {

      context.State = new RestingState();

      return "You fall down and sleep";

    }

  }

  class PanickingState : IState {

    public override string Move(Context context) {

      return "You move around randomly in a blind panic";

    }

    public override string Attack(Context context) {

      return "You start attacking the darkness, but keep on missing";

    }

    public override string Stop(Context context) {

      context.State = new MovingState();

      return "You are start relaxing, but keep on moving";

    }

    public override string Run(Context context) {

      return "You run around in your panic";

    }

    public override string Panic(Context context) {

      return "You are already in a panic";

    }

    public override string CalmDown(Context context) {

      context.State = new RestingState();

      return "You relax and calm down";

    }

  }

  class MovingState : IState {

    public override string Move(Context context) {

      return"You move around randomly";

    }

    public override string Attack(Context context) {

      return"You need to stop moving first";

    }

    public override string Stop(Context context) {

      context.State = new RestingState();

      return"You stand still in a dark room";

    }

    public override string Run(Context context) {

      return"You run around in cirles";

    }

    public override string Panic(Context context) {

      context.State = new PanickingState();

      return"You start Panicking and begin seeing things";

    }

    public override string CalmDown(Context context) {

      context.State = new RestingState();

      return"You stand still and relax";

    }

  }

   

   class Context {

    public IState State {get; set; }

    public void Request(char c) {

      string result;

      switch (char.ToLower(c)) {

        case 'm' : result = State.Move(this);

             break;

        case 'a' : result = State.Attack(this);

            break;

        case 's' : result = State.Stop(this);

            break;

        case 'r' : result = State.Run(this);

           break;

        case 'p' : result = State.Panic(this);

           break;

        case 'c' : result = State.CalmDown(this);

            break;

        case 'e' : result = "Thank you for playing \"The RPC Game\"";

            break;

        default : result = "Error, try again";

           break;

      }

      Console.WriteLine(result);

    }

  }

  static class Program {

    // The user interface

    static void Main () {

      // context.s are States

      // Decide on a starting state and hold onto the Context thus established

      Context context = new Context();

      context.State = new RestingState();

      char command = ' ';

      Console.WriteLine("Welcome to \"The State Game\"!");

      Console.WriteLine("You are standing here looking relaxed!");

      while (char.ToLower(command) != 'e') {

        Console.WriteLine("\nWhat would you like to do now?");

        Console.Write("   Move    Attack    Stop    Run    Panic    CalmDown    Exit the game: ==>");

        string choice;

        do

          choice = Console.ReadLine();

          while (choice==null);

          command = choice[0];

          context.Request(command);

        }

      }

    }

  }