/*
 * Copyright (C) 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.doclava;

import com.google.clearsilver.jsilver.data.Data;

import java.util.HashMap;
import java.util.TreeSet;
import java.util.Set;

public class Hierarchy {
  public static void makeHierarchy(Data hdf, ClassInfo[] classes) {
    HashMap<String, TreeSet<String>> nodes = new HashMap<String, TreeSet<String>>();

    for (ClassInfo cl : classes) {
      String name = cl.qualifiedName();

      TreeSet<String> me = nodes.get(name);
      if (me == null) {
        me = new TreeSet<String>();
        nodes.put(name, me);
      }

      ClassInfo superclass = cl.superclass();
      String sname = superclass != null ? superclass.qualifiedName() : null;
      if (sname != null) {
        TreeSet<String> s = nodes.get(sname);
        if (s == null) {
          s = new TreeSet<String>();
          nodes.put(sname, s);
        }
        s.add(name);
      }
    }

    /*
     * Set<String> keys = nodes.keySet(); for (String n: keys) { System.out.println("class: " + n);
     * 
     * TreeSet<String> values = nodes.get(n); for (String v: values) {
     * System.out.println("       - " + v); } }
     */

    int depth = depth(nodes, "java.lang.Object");

    hdf.setValue("classes.0", "");
    hdf.setValue("colspan", "" + depth);

    recurse(nodes, "java.lang.Object", hdf.getChild("classes.0"), depth, depth);

    if (false) {
      Set<String> keys = nodes.keySet();
      if (keys.size() > 0) {
        System.err.println("The following classes are hidden but"
            + " are superclasses of not-hidden classes");
        for (String n : keys) {
          System.err.println("  " + n);
        }
      }
    }
  }

  private static int depth(HashMap<String, TreeSet<String>> nodes, String name) {
    int d = 0;
    TreeSet<String> derived = nodes.get(name);
    if (derived != null && derived.size() > 0) {
      for (String s : derived) {
        int n = depth(nodes, s);
        if (n > d) {
          d = n;
        }
      }
    }
    return d + 1;
  }

  private static boolean exists(ClassInfo cl) {
    return cl != null && !cl.isHiddenOrRemoved() && cl.isIncluded();
  }

  private static void recurse(HashMap<String, TreeSet<String>> nodes, String name, Data hdf,
      int totalDepth, int remainingDepth) {
    int i;

    hdf.setValue("indent", "" + (totalDepth - remainingDepth - 1));
    hdf.setValue("colspan", "" + remainingDepth);

    ClassInfo cl = Converter.obtainClass(name);

    hdf.setValue("class.label", cl.name());
    hdf.setValue("class.qualified", cl.qualifiedName());
    if (cl.checkLevel()) {
      hdf.setValue("class.link", cl.htmlPage());
    }

    if (exists(cl)) {
      hdf.setValue("exists", "1");
    }

    i = 0;
    for (ClassInfo iface : cl.interfaces()) {
      hdf.setValue("interfaces." + i + ".class.label", iface.name());
      hdf.setValue("interfaces." + i + ".class.qualified", iface.qualifiedName());
      if (iface.checkLevel()) {
        hdf.setValue("interfaces." + i + ".class.link", iface.htmlPage());
      }
      if (exists(cl)) {
        hdf.setValue("interfaces." + i + ".exists", "1");
      }
      i++;
    }

    TreeSet<String> derived = nodes.get(name);
    if (derived != null && derived.size() > 0) {
      hdf.setValue("derived", "");
      Data children = hdf.getChild("derived");
      i = 0;
      remainingDepth--;
      for (String s : derived) {
        String index = "" + i;
        children.setValue(index, "");
        recurse(nodes, s, children.getChild(index), totalDepth, remainingDepth);
        i++;
      }
    }

    nodes.remove(name);
  }
}