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package stdlib;
import java.util.function.*;

public class DoublingTest {
  private static double time;
  private static long ops;
  /**
   * During a doubling test, the provided code may call <code>incOps</code> and/or <code>addOps</code>.
   * If either is called, then the number of operations so recorded will be reported by <code>run</code>.
   */
  public static void incOps () { ops++; }
  /**
   * During a doubling test, the provided code may call <code>incOps</code> and/or <code>addOps</code>.
   * If either is called, then the number of operations so recorded will be reported by <code>run</code>.
   */
  public static void addOps (int count) {
    if (count < 1) throw new IllegalArgumentException ();
    ops += count;
  }
  /**
   * See fully parameterized <code>run</code> for a description.
   * In this abbreviated form, <code>numTestsPerValue</code> is 1.
   * <code>setup</code> does nothing, therefore no value is provided to <code>timed</code>.
   */
  public static void run (int initialValue, int numValues, Consumer<Integer> timed) {
      run (initialValue, numValues, 1, x -> {}, timed);
  }
  /**
   * See fully parameterized <code>run</code> for a description.
   * In this abbreviated form, <code>numTestsPerValue</code> is 1.
   * No value is passed from <code>setup</code> to <code>timed</code>.
   */
  public static void run (int initialValue, int numValues, Consumer<Integer> setup, Consumer<Integer> timed) {
    run (initialValue, numValues, 1, setup, timed);
  }
  /**
   * See fully parameterized <code>run</code> for a description.
   * In this abbreviated form, no value is passed from <code>setup</code> to <code>timed</code>.
   */
  public static void run (int initialValue, int numValues, int numTestsPerValue, Consumer<Integer> setup, Consumer<Integer> timed) {
    run (initialValue, numValues, numTestsPerValue, (Integer x) -> { setup.accept (x); return null; }, (x,t) -> timed.accept (x));
  }
  /**
   * See fully parameterized <code>run</code> for a description.
   * In this abbreviated form, <code>numTestsPerValue</code> is 1.
   */
  public static <T> void run (int initialValue, int numValues, Function<Integer,T> setup, BiConsumer<Integer,T> timed) {
    run (initialValue, numValues, 1, setup, timed);
  }
  /**
   * See fully parameterized <code>run</code> for a description.
   * In this abbreviated form, the integer value is not passed to <code>timed</code>.
   */
  public static <T> void run (int initialValue, int numValues, int numTestsPerValue, Function<Integer,T> setup, Consumer<T> timed) {
    run (initialValue, numValues, numTestsPerValue, setup, (x,t) -> timed.accept (t));
  }
  /**
   * See fully parameterized <code>run</code> for a description.
   * In this abbreviated form, <code>numTestsPerValue</code> is 1.
   * The integer value is not passed to <code>timed</code>.
   */
  public static <T> void run (int initialValue, int numValues, Function<Integer,T> setup, Consumer<T> timed) {
    run (initialValue, numValues, 1, setup, timed);
  }
  /**
   * Run the function <code>timed</code> with increasing large values for the first integer parameter (N).
   * Running time is reported to the console.
   * Initial value of N is given by <code>initialValue</code>.
   * N doubles each time the test is run.
   * The number of different values for N is given by <code>numValues</code>.
   * If <code>numTestsPerValue</code> is larger than one, then the test will be run multiple times for each N, and the average time reported.
   * The <code>setup</code> function is called before <code>timed</code>, and the result (of type T) is provided to <code>timed</code> as the second parameter.
   * <code>setup</code> is called once before each call to <code>timed</code>.
   */
  public static <T> void run (int initialValue, int numValues, int numTestsPerValue, Function<Integer,T> setup, BiConsumer<Integer,T> timed) {
    int value = initialValue;
    runOnce (value, numTestsPerValue, setup, timed);
    if (ops != 0) {
      System.out.format("N=%10d, ops=%10d,             seconds=%5.3f\n", value, ops/numTestsPerValue, time/numTestsPerValue);
    } else {
      System.out.format("N=%10d, seconds=%5.3f\n", value, time/numTestsPerValue);
    }
    double prevOps = ops;
    double prevTime = time;
    for (int i=1; i<numValues; i++) {
      value *= 2;
      runOnce (value, numTestsPerValue, setup, timed);
      if (ops != 0) {
        System.out.format("N=%10d, ops=%10d ratio=%5.1f, seconds=%5.3f ratio=%5.3f\n", value, ops/numTestsPerValue, ops/prevOps, time/numTestsPerValue, time/prevTime);
      } else {
        System.out.format("N=%10d, seconds=%5.3f ratio=%5.3f\n", value, time/numTestsPerValue, time/prevTime);
      }
      prevOps = ops;
      prevTime = time;
    }
  }
  private static <T> void runOnce (int value, int numTestsPerValue, Function<Integer,T> setup, BiConsumer<Integer,T> timed) {
    ops = 0;
    time = 0;
    for (int testNum = 0; testNum < numTestsPerValue; testNum++) {
      T setupResult = setup.apply (value);
      Stopwatch sw = new Stopwatch ();
      timed.accept (value, setupResult);
      time += sw.elapsedTime ();
    }
  }

  // Now repeat everything with Long, rather than Integer

  /**
   * See fully parameterized <code>runLong</code> for a description.
   * In this abbreviated form, <code>numTestsPerValue</code> is 1.
   * <code>setup</code> does nothing, therefore no value is provided to <code>timed</code>.
   */
  public static void runLong (long initialValue, int numValues, Consumer<Long> timed) {
    runLong (initialValue, numValues, 1, x -> {}, timed);
  }
  /**
   * See fully parameterized <code>runLong</code> for a description.
   * In this abbreviated form, <code>numTestsPerValue</code> is 1.
   * No value is passed from <code>setup</code> to <code>timed</code>.
   */
  public static void runLong (long initialValue, int numValues, Consumer<Long> setup, Consumer<Long> timed) {
    runLong (initialValue, numValues, 1, setup, timed);
  }
  /**
   * See fully parameterized <code>runLong</code> for a description.
   * In this abbreviated form, no value is passed from <code>setup</code> to <code>timed</code>.
   */
  public static void runLong (long initialValue, int numValues, int numTestsPerValue, Consumer<Long> setup, Consumer<Long> timed) {
    runLong (initialValue, numValues, numTestsPerValue, (Long x) -> { setup.accept (x); return null; }, (x,t) -> timed.accept (x));
  }
  /**
   * See fully parameterized <code>runLong</code> for a description.
   * In this abbreviated form, <code>numTestsPerValue</code> is 1.
   */
  public static <T> void runLong (long initialValue, int numValues, Function<Long,T> setup, BiConsumer<Long,T> timed) {
    runLong (initialValue, numValues, 1, setup, timed);
  }
  /**
   * See fully parameterized <code>runLong</code> for a description.
   * In this abbreviated form, the integer value is not passed to <code>timed</code>.
   */
  public static <T> void runLong (long initialValue, int numValues, int numTestsPerValue, Function<Long,T> setup, Consumer<T> timed) {
    runLong (initialValue, numValues, numTestsPerValue, setup, (x,t) -> timed.accept (t));
  }
  /**
   * See fully parameterized <code>runLong</code> for a description.
   * In this abbreviated form, <code>numTestsPerValue</code> is 1.
   * The integer value is not passed to <code>timed</code>.
   */
  public static <T> void runLong (long initialValue, int numValues, Function<Long,T> setup, Consumer<T> timed) {
    runLong (initialValue, numValues, 1, setup, timed);
  }
  /**
   * Run the function <code>timed</code> with increasing large values for the first integer parameter (N).
   * Running time is reported to the console.
   * Initial value of N is given by <code>initialValue</code>.
   * N doubles each time the test is runLong.
   * The number of different values for N is given by <code>numValues</code>.
   * If <code>numTestsPerValue</code> is larger than one, then the test will be runLong multiple times for each N, and the average time reported.
   * The <code>setup</code> function is called before <code>timed</code>, and the result (of type T) is provided to <code>timed</code> as the second parameter.
   * <code>setup</code> is called once before each call to <code>timed</code>.
   */
  public static <T> void runLong (long initialValue, int numValues, int numTestsPerValue, Function<Long,T> setup, BiConsumer<Long,T> timed) {
    long value = initialValue;
    runOnce (value, numTestsPerValue, setup, timed);
    if (ops != 0) {
      System.out.format("N=%10d, ops=%10d,             seconds=%5.3f\n", value, ops/numTestsPerValue, time/numTestsPerValue);
    } else {
      System.out.format("N=%10d, seconds=%5.3f\n", value, time/numTestsPerValue);
    }
    double prevOps = ops;
    double prevTime = time;
    for (int i=1; i<numValues; i++) {
      value *= 2;
      runOnce (value, numTestsPerValue, setup, timed);
      if (ops != 0) {
        System.out.format("N=%10d, ops=%10d ratio=%5.1f, seconds=%5.3f ratio=%5.3f\n", value, ops/numTestsPerValue, ops/prevOps, time/numTestsPerValue, time/prevTime);
      } else {
        System.out.format("N=%10d, seconds=%5.3f ratio=%5.3f\n", value, time/numTestsPerValue, time/prevTime);
      }
      prevOps = ops;
      prevTime = time;
    }
  }
  private static <T> void runOnce (long value, int numTestsPerValue, Function<Long,T> setup, BiConsumer<Long,T> timed) {
    ops = 0;
    time = 0;
    for (int testNum = 0; testNum < numTestsPerValue; testNum++) {
      T setupResult = setup.apply (value);
      Stopwatch sw = new Stopwatch ();
      timed.accept (value, setupResult);
      time += sw.elapsedTime ();
    }
  }
}