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/*
 * Copyright (c) 1998-2018 John Caron and University Corporation for Atmospheric Research/Unidata
 * See LICENSE for license information.
 */
package ucar.nc2.util.reflect;

import java.lang.reflect.*;
import java.io.*;
import java.util.*;

public class PublicInterfaceGenerator {

  static void generate(Class c, boolean doAllMethods, PrintStream out) throws SecurityException {

    Class sc = c.getSuperclass();

    out.print("public class " + makeClassName(c));
    if (sc != Object.class)
      out.print(" extends " + makeClassName(sc));
    out.println(" {");

    ArrayList allMethods = new ArrayList();
    addAllMethods(allMethods, c, doAllMethods);
    allMethods.sort(new MethodComparator());
    for (Object allMethod : allMethods) {
      genMethod((Method) allMethod, out);
    }

    out.println("}");
  }

  private static void addAllMethods(ArrayList allMethods, Class c, boolean doAllMethods) {
    if (c == null)
      return;
    if (c == Object.class)
      return;
    Method[] methodsArray = doAllMethods ? c.getMethods() : c.getDeclaredMethods();
    allMethods.addAll(Arrays.asList(methodsArray));

    // addAllMethods( allMethods, c.getSuperclass());
  }

  static void genMethod(Method m, PrintStream out) throws SecurityException {
    int mods = m.getModifiers();
    if (Modifier.isPrivate(mods) || Modifier.isProtected(mods))
      return;

    out.print("  " + Modifier.toString(mods));
    out.print(" " + makeClassName(m.getReturnType()));
    out.print(" " + m.getName() + "(");

    Class[] params = m.getParameterTypes();
    for (int i = 0; i < params.length; i++) {
      if (i > 0)
        out.print(", ");
      out.print(makeClassName(params[i]) + " p" + i);
    }
    out.print(")");

    Class[] ex = m.getExceptionTypes();
    if (ex.length > 0) {
      out.print(" throws ");
      for (int i = 0; i < ex.length; i++) {
        if (i > 0)
          out.print(", ");
        out.print(ex[i].getName());
      }
    }

    out.println(";");
  }

  static String makeClassName(Class c) {
    if (c.isArray()) {
      return makeClassName(c.getComponentType()) + "[]";
    }

    String name = c.getName();
    Package p = c.getPackage();
    if (p == null)
      return name;
    String packageName = p.getName();
    return name.substring(packageName.length() + 1);
  }

  public static class MethodComparator implements java.util.Comparator {
    public int compare(Object o1, Object o2) {
      Method t1 = (Method) o1;
      Method t2 = (Method) o2;
      return t1.getName().compareTo(t2.getName());
    }

    public boolean equals(Object obj) {
      return obj == this;
    }
  }

  public static void showMethods(Class c, PrintStream out) {

    out.println("Methods for class " + c.getName());

    Method[] methodsArray = c.getDeclaredMethods();

    for (Method m : methodsArray) {
      System.out.println(" " + m.getName());
    }
  }
}