/*
 * Copyright (c) 2003-2004, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.bundle.desktopawt;

import org.osgi.framework.*;

import java.awt.*;

public class Util {
  public static Color rgbInterpolate(Color c1, Color c2, double k) {
    
    if(c1 == null || c2 == null) {
      return Color.gray;
    }
    
    if(k <= 0.0) return c1;
    if(k >= 1.0) return c2;

    int r1 = c1.getRed();
    int g1 = c1.getGreen();
    int b1 = c1.getBlue();
    int r2 = c2.getRed();
    int g2 = c2.getGreen();
    int b2 = c2.getBlue();

    int r = (int)(r1 + k * (double)(r2 - r1));
    int g = (int)(g1 + k * (double)(g2 - g1));
    int b = (int)(b1 + k * (double)(b2 - b1));

    Color c = new Color(r, g, b);
    return c;
  }

 public static String stateName(int state) {
    switch(state) {
    case Bundle.ACTIVE:
      return "active";
    case Bundle.INSTALLED:
      return "installed";
    case Bundle.UNINSTALLED:
      return "uninstalled";
    case Bundle.RESOLVED:
      return "resolved";
    case Bundle.STARTING:
      return "starting";
    case Bundle.STOPPING:
      return "stopping";
    default:
      return "unknown " + state;
    }
  }

  public static String getHeader(Bundle b, String name) {
    return getHeader(b, name, null);
  }

  public static String getHeader(Bundle b, String name, String def) {
    String s = b != null
      ? (String)b.getHeaders().get(name)
      : def;

    return s;
  }
  
  public static String getBundleName(Bundle b) {
    String s = getHeader(b, "Bundle-Name", "");
    if(s == null || "".equals(s) || s.startsWith("%")) {
      s = shortLocation(b.getLocation());
    }

    return s;
  }

  public static boolean canBeStarted(Bundle b) {
    return hasActivator(b) || hasMainClass(b);
  }

  public static boolean hasActivator(Bundle b) {
    return null != getHeader(b, "Bundle-Activator");
  }

  public static boolean hasMainClass(Bundle b) {
    return null != getHeader(b, "Main-class");
  }

 public static String shortLocation(String s) {
    int ix = s.lastIndexOf("/");

    // handle eclipse extended location directory syntax
    if(s.endsWith("/")) {
      ix = s.lastIndexOf("/", ix - 1);
    }

    if(ix == -1) {
      ix = s.lastIndexOf("\\");
    }
    if(ix != -1) {
      return s.substring(ix + 1);
    }
    return s;
  }

  // String replace functions below by Erik Wistrand

  /**
   * Replace all occurances of a substring with another string.
   *
   * <p>
   * The returned string will shrink or grow as necessary, depending on
   * the lengths of <tt>v1</tt> and <tt>v2</tt>.
   * </p>
   *
   * <p>
   * Implementation note: This method avoids using the standard String
   * manipulation methods to increase execution speed. 
   * Using the <tt>replace</tt> method does however
   * include two <tt>new</tt> operations in the case when matches are found.
   * </p>
   *
   *
   * @param s  Source string.
   * @param v1 String to be replaced with <code>v2</code>.
   * @param v2 String replacing <code>v1</code>. 
   * @return Modified string. If any of the input strings are <tt>null</tt>,
   *         the source string <tt>s</tt> will be returned unmodified. 
   *         If <tt>v1.length == 0</tt>, <tt>v1.equals(v2)</tt> or
   *         no occurances of <tt>v1</tt> is found, also 
   *         return <tt>s</tt> unmodified.
   */
  public static String replace(final String s, 
			       final String v1, 
			       final String v2) {
    
    // return quick when nothing to do
    if(s == null 
       || v1 == null 
       || v2 == null 
       || v1.length() == 0 
       || v1.equals(v2)) {
      return s;
    }

    int ix       = 0;
    int v1Len    = v1.length(); 
    int n        = 0;

    // count number of occurances to be able to correctly size
    // the resulting output char array
    while(-1 != (ix = s.indexOf(v1, ix))) {
      n++;
      ix += v1Len;
    }

    // No occurances at all, just return source string
    if(n == 0) {
      return s;
    }

    // Set up an output char array of correct size
    int     start  = 0;
    int     v2Len  = v2.length();
    char[]  r      = new char[s.length() + n * (v2Len - v1Len)];
    int     rPos   = 0;

    // for each occurance, copy v2 where v1 used to be
    while(-1 != (ix = s.indexOf(v1, start))) {
      while(start < ix) r[rPos++] = s.charAt(start++);
      for(int j = 0; j < v2Len; j++) {
	r[rPos++] = v2.charAt(j);
      }
      start += v1Len;
    }

    // ...and add all remaining chars
    ix = s.length(); 
    while(start < ix) r[rPos++] = s.charAt(start++);
    
    // ..ouch. this hurts.
    return new String(r);
  }

}