/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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 org.jetbrains.java.decompiler.struct;

import org.jetbrains.java.decompiler.main.extern.IDecompilatSaver;
import org.jetbrains.java.decompiler.struct.lazy.LazyLoader;
import org.jetbrains.java.decompiler.struct.lazy.LazyLoader.Link;
import org.jetbrains.java.decompiler.util.DataInputFullStream;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.jar.Manifest;

public class ContextUnit {

  public static final int TYPE_FOLDER = 0;
  public static final int TYPE_JAR = 1;
  public static final int TYPE_ZIP = 2;

  private static final String MANIFEST_ENTRY = "META-INF/MANIFEST.MF";

  // *****************************************************************************
  // private fields
  // *****************************************************************************

  private int type;

  // relative path to jar/zip
  private String archivepath;

  // folder: relative path
  // archive: file name
  private String filename;

  private List<StructClass> classes = new ArrayList<StructClass>();

  // class file or jar/zip entry. Should, but doesn't have to be the same as qualifiedName of the class
  private List<String> classentries = new ArrayList<String>();

  private List<String> direntries = new ArrayList<String>();

  private List<String[]> otherentries = new ArrayList<String[]>();

  private Manifest manifest;

  private IDecompilatSaver decompilatSaver;

  private IDecompiledData decompiledData;

  private boolean own = true;

  // *****************************************************************************
  // constructors
  // *****************************************************************************

  public ContextUnit(int type, String archivepath, String filename, boolean own,
                     IDecompilatSaver decompilatSaver, IDecompiledData decompiledData) {
    this.type = type;
    this.own = own;
    this.archivepath = archivepath;
    this.filename = filename;
    this.decompilatSaver = decompilatSaver;
    this.decompiledData = decompiledData;
  }

  // *****************************************************************************
  // public methods
  // *****************************************************************************

  public void addClass(StructClass cl, String entryname) {
    classes.add(cl);
    classentries.add(entryname);
  }

  public void addDirEntry(String entry) {
    direntries.add(entry);
  }

  public void addOtherEntry(String fullpath, String entry) {
    otherentries.add(new String[]{fullpath, entry});
  }

  public void reload(LazyLoader loader) throws IOException {

    List<StructClass> lstClasses = new ArrayList<StructClass>();
    for (StructClass cl : classes) {
      String oldname = cl.qualifiedName;

      StructClass newcl;
      DataInputFullStream in = loader.getClassStream(oldname);
      try {
        newcl = new StructClass(in, cl.isOwn(), loader);
      }
      finally {
        in.close();
      }

      lstClasses.add(newcl);

      Link lnk = loader.getClassLink(oldname);
      loader.removeClassLink(oldname);
      loader.addClassLink(newcl.qualifiedName, lnk);
    }

    classes = lstClasses;
  }

  public void save() {

    switch (type) {
      case TYPE_FOLDER:

        // create folder
        decompilatSaver.saveFolder(filename);

        // non-class files
        for (String[] arr : otherentries) {
          decompilatSaver.copyFile(arr[0], filename, arr[0]);
        }

        // classes
        for (int i = 0; i < classes.size(); i++) {

          StructClass cl = classes.get(i);
          String entryname = classentries.get(i);

          entryname = decompiledData.getClassEntryName(cl, entryname);
          if (entryname != null) {
            String content = decompiledData.getClassContent(cl);
            if (content != null) {
              decompilatSaver.saveClassFile(filename, cl.qualifiedName, entryname, content);
            }
          }
        }

        break;
      case TYPE_JAR:
      case TYPE_ZIP:

        // create archive file
        decompilatSaver.saveFolder(archivepath);
        decompilatSaver.createArchive(archivepath, filename, manifest);

        // directory entries
        for (String direntry : direntries) {
          decompilatSaver.saveEntry(archivepath, filename, direntry, null);
        }

        // non-class entries
        for (String[] arr : otherentries) {
          // manifest was defined by constructor invocation
          if (type != TYPE_JAR || !MANIFEST_ENTRY.equalsIgnoreCase(arr[1])) {
            decompilatSaver.copyEntry(arr[0], archivepath, filename, arr[1]);
          }
        }

        // classes
        for (int i = 0; i < classes.size(); i++) {

          StructClass cl = classes.get(i);
          String entryname = classentries.get(i);

          entryname = decompiledData.getClassEntryName(cl, entryname);
          if (entryname != null) {
            String content = decompiledData.getClassContent(cl);
            decompilatSaver.saveClassEntry(archivepath, filename, cl.qualifiedName, entryname, content);
          }
        }

        decompilatSaver.closeArchive(archivepath, filename);
    }
  }

  // *****************************************************************************
  // private methods
  // *****************************************************************************

  // *****************************************************************************
  // getter and setter methods
  // *****************************************************************************

  public void setManifest(Manifest manifest) {
    this.manifest = manifest;
  }

  public boolean isOwn() {
    return own;
  }

  public List<StructClass> getClasses() {
    return classes;
  }

  public int getType() {
    return type;
  }

  public void setDecompilatSaver(IDecompilatSaver decompilatSaver) {
    this.decompilatSaver = decompilatSaver;
  }

  public void setDecompiledData(IDecompiledData decompiledData) {
    this.decompiledData = decompiledData;
  }
}