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// Modified or written by Object Mentor, Inc. for inclusion with FitNesse.
// Copyright (c) 2002 Cunningham & Cunningham, Inc.
// Released under the terms of the GNU General Public License version 2 or later.
// Copyright (C) 2003,2004 by Object Mentor, Inc. All rights reserved.
// Released under the terms of the GNU General Public License version 2 or
// later.
package util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class GracefulNamer {
  private static final Pattern disgracefulNamePattern = Pattern
    .compile("\\w(?:[.]|\\w)*[^.]");

  public static boolean isGracefulName(String fixtureName) {
    Matcher matcher = disgracefulNamePattern.matcher(fixtureName);
    return !matcher.matches();
  }

  public static String disgrace(String fixtureName) {
    GracefulNamer namer = new GracefulNamer();

    for (int i = 0; i < fixtureName.length(); i++) {
      char c = fixtureName.charAt(i);
      if (Character.isLetter(c))
        namer.currentState.letter(c);
      else if (Character.isDigit(c))
        namer.currentState.digit(c);
      else
        namer.currentState.other(c);
    }

    return namer.finalName.toString();
  }

  //todo OH FRATZ!  Graceful names was for java method and instance names, not wiki page names!  Get all this wiki page name stuff out of here.
  public static String regrace(String disgracefulName) {
    final char separator = '.';
    char c = '?';
    GracefulNamer namer = new GracefulNamer();
    if (!disgracefulName.isEmpty())
      namer.finalName.append(c = disgracefulName.charAt(0));

    boolean isGrabbingDigits = false;
    boolean wasSeparator = c == '.' || c == '<' || c == '>';
    for (int i = 1; i < disgracefulName.length(); i++) {
      c = disgracefulName.charAt(i);
      if ((Character.isUpperCase(c))
        || (Character.isDigit(c) && !isGrabbingDigits)
        || (c == separator)
        ) {
        if (!wasSeparator) namer.finalName.append(" ");
        wasSeparator = (c == separator);
      }

      isGrabbingDigits = (Character.isDigit(c));
      namer.finalName.append(c);
    }

    return namer.finalName.toString();
  }

  private StringBuffer finalName = new StringBuffer();

  private GracefulNameState currentState = new OutOfWordState();

  private GracefulNamer() {
  }

  private interface GracefulNameState {
    void letter(char c);

    void digit(char c);

    void other(char c);
  }

  private class InWordState implements GracefulNameState {
    @Override
    public void letter(char c) {
      finalName.append(c);
    }

    @Override
    public void digit(char c) {
      finalName.append(c);
      currentState = new InNumberState();
    }

    @Override
    public void other(char c) {
      currentState = new OutOfWordState();
    }
  }

  private class InNumberState implements GracefulNameState {
    @Override
    public void letter(char c) {
      finalName.append(Character.toUpperCase(c));
      currentState = new InWordState();
    }

    @Override
    public void digit(char c) {
      finalName.append(c);
    }

    @Override
    public void other(char c) {
      currentState = new OutOfWordState();
    }
  }

  private class OutOfWordState implements GracefulNameState {
    @Override
    public void letter(char c) {
      finalName.append(Character.toUpperCase(c));
      currentState = new InWordState();
    }

    @Override
    public void digit(char c) {
      finalName.append(c);
      currentState = new InNumberState();
    }

    @Override
    public void other(char c) {
    }
  }
}