import SimpleOutput;
import SimpleInput;
import NumberGameOracle;	// The oracle knows the answer.
import NumberGameGuesser;	// The guesser does not.

/**
 * Let the computer play the number game.  The user tells the computer
 * which number, and then the guesser tries to guess.
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of January 1999
 */
public class NumberGame {
  /**
   * Play the game.
   */
  public static void main(String[] args) {
    // A game with no output is fairly boring.
    SimpleOutput out = new SimpleOutput();
    // We'll need to read a number to guess.
    SimpleInput in = new SimpleInput();
    // Our intelligent guesser.
    NumberGameGuesser guesser = new NumberGameGuesser();
    // And our even more intelligent oracle.  We'll create the oracle once
    // we know the solution.
    NumberGameOracle oracle;
    // The number to guess.
    long solution;
    // The lower bound of the range.
    long lower;
    // The upper bound of the range.
    long upper;
    // The minimum lower and maximum upper bounds (required by the guesser).
    long min_lower = Long.MIN_VALUE/2;
    long max_upper = Long.MAX_VALUE/2;
    // Describe the game.
    out.println("Welcome to the amazing number game.  You will give me");
    out.println("a range of numbers and a number to guess.  I will tell");
    out.println("my friend to guess the number, and we'll see how it does.");
    out.println();
    // Ask for the range.
    out.print("Enter the smallest possible answer " + 
              "(at least " + min_lower + "): ");
    lower = in.readLong();
    if (in.hadError()) { lower = min_lower; }
    out.print("Enter the largest possible answer " + 
              "(at most " + max_upper + "): ");
    upper = in.readLong();
    if (in.hadError()) { upper = max_upper; }
    // Validate the range.
    if (lower < min_lower) {
      out.println("Your smallest number is too small.");
      return;
    }
    if (upper > max_upper) {
      out.println("Your largest number is too large.");
      return;
    }
    if (upper < lower) {
      out.println("The smallest number is larger than the largest number.");
      return;
    }
    // Ask for input.
    out.print("Please enter the number to guess: " +
              "(between " + lower + " and " + upper + "): ");
    solution = in.readLong();
    // Validate the solution.
    if (solution < lower) {
      out.println("Your solution is less than the smallest number.");
      return;
    }
    if (solution > upper) {
      out.println("Your solution is larger than the largest number.");
      return;
    }
    // Create the oracle.
    oracle = new NumberGameOracle(solution);
    // Okay, let's play the game.
    guesser.guessNumber(lower,upper,out,oracle);  
    // We're done.
  } // main(String[])
} // class NumberGame