/*
 *    Fernflower - The Analytical Java Decompiler
 *    http://www.reversed-java.com
 *
 *    (C) 2008 - 2010, Stiver
 *
 *    This software is NEITHER public domain NOR free software 
 *    as per GNU License. See license.txt for more details.
 *
 *    This software is distributed WITHOUT ANY WARRANTY; without 
 *    even the implied warranty of MERCHANTABILITY or FITNESS FOR 
 *    A PARTICULAR PURPOSE. 
 */

package org.jetbrains.java.decompiler.struct;

import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import org.jetbrains.java.decompiler.main.DecompilerContext;
import org.jetbrains.java.decompiler.main.extern.IDecompilatSaver;
import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
import org.jetbrains.java.decompiler.struct.lazy.LazyLoader;


public class StructContext {

	// *****************************************************************************
	// private fields
	// *****************************************************************************
	
	private LazyLoader loader;
	
	private HashMap<String, StructClass> classes = new HashMap<String, StructClass>();
	
	private HashMap<String, ContextUnit> units = new HashMap<String, ContextUnit>();
	
	private ContextUnit defaultUnit;  

	private IDecompilatSaver saver; 
	
	private IDecompiledData decdata;
	
	public StructContext(IDecompilatSaver saver, IDecompiledData decdata, LazyLoader loader) {
		
		this.saver = saver;
		this.decdata = decdata;
		this.loader = loader;
		
		defaultUnit = new ContextUnit(ContextUnit.TYPE_FOLDER, null, "", true, saver, decdata);
		units.put("", defaultUnit);
	}
	
	// *****************************************************************************
	// public methods
	// *****************************************************************************
	
	public StructClass getClass(String name) {
		return classes.get(name);
	}
	
	public void reloadContext() throws IOException {
		
		for(ContextUnit unit: units.values()) {
			
			for(StructClass cl : unit.getClasses()) {
				classes.remove(cl.qualifiedName);
			}
			
			unit.reload(loader);
			
			// adjust lobal class collection
			for(StructClass cl : unit.getClasses()) {
				classes.put(cl.qualifiedName, cl);
			}
		}
	}
	
	public void saveContext() {
		
		for(ContextUnit unit: units.values()) {
			if(unit.isOwn()) {
				unit.save();
			}
		}
	}
	
	public void addSpace(File file, boolean isOwn) throws IOException {
		addSpace("", file, isOwn); 
	}
	
	private void addSpace(String path, File file, boolean isOwn) throws IOException {

		if(file.isDirectory()) {

			File[] files = file.listFiles();
			path += "/" + (path.length()==0?"":file.getName());

			for(int i=files.length-1;i>=0;i--) {
				addSpace(path, files[i], isOwn);
			}

		} else {

			String filename = file.getName();

			boolean isArchive = false;

			try {
				if(filename.endsWith(".jar")) {
					addArchive(path, file, ContextUnit.TYPE_JAR, isOwn);
					isArchive = true;
				} else if(filename.endsWith(".zip")) {
					addArchive(path, file, ContextUnit.TYPE_ZIP, isOwn);
					isArchive = true;
				}
			} catch(IOException ex) {
				DecompilerContext.getLogger()
								.writeMessage("Invalid archive file: "+(path.length()>0?path+"/":"")+filename, IFernflowerLogger.ERROR);
			}

			if(!isArchive) {
				ContextUnit unit = units.get(path);
				if(unit == null) {
					unit = new ContextUnit(ContextUnit.TYPE_FOLDER, null, path, isOwn, saver, decdata);
					units.put(path, unit);
				}

				boolean isClass = false;

				if(filename.endsWith(".class")) {
					try {
						StructClass cl = new StructClass(loader.getClassStream(file.getAbsolutePath(), null), isOwn, loader);
						
						classes.put(cl.qualifiedName, cl);
						unit.addClass(cl, filename);
						loader.addClassLink(cl.qualifiedName, new LazyLoader.Link(LazyLoader.Link.CLASS, file.getAbsolutePath(), null));
						
						isClass = true;
					} catch(IOException ex) {
						DecompilerContext.getLogger()
								.writeMessage("Invalid class file: "+(path.length()>0?path+"/":"")+filename, IFernflowerLogger.ERROR);
					}
				}
				
				if(!isClass) {
					unit.addOtherEntry(file.getAbsolutePath(), filename);
				}
			}
		}
	}
	
	
	private void addArchive(String path, File file, int type, boolean isOwn) throws IOException {

		ZipFile archive;
		
		if(type == ContextUnit.TYPE_JAR) {  // jar
			archive = new JarFile(file);
		} else {  // zip
			archive = new ZipFile(file);
		}
		
		Enumeration<? extends ZipEntry> en = archive.entries();
		while(en.hasMoreElements()) {
			ZipEntry entr = en.nextElement();
			
			ContextUnit unit = units.get(path+"/"+file.getName());
			if(unit == null) {
				unit = new ContextUnit(type, path, file.getName(), isOwn, saver, decdata);
				if(type == ContextUnit.TYPE_JAR) {
					unit.setManifest(((JarFile)archive).getManifest());
				}
				units.put(path+"/"+file.getName(), unit);
			}
			
			String name = entr.getName();
			if(!entr.isDirectory()) {
				if(name.endsWith(".class")) {
					StructClass cl = new StructClass(archive.getInputStream(entr), isOwn, loader);
					classes.put(cl.qualifiedName, cl);
					
					unit.addClass(cl, name);
					
					if(loader != null) {
						loader.addClassLink(cl.qualifiedName, new LazyLoader.Link(LazyLoader.Link.ENTRY, file.getAbsolutePath(), name));
					}
					
				} else {
					unit.addOtherEntry(file.getAbsolutePath(), name);
				}
			} else if(entr.isDirectory()) {
				unit.addDirEntry(name);
			}
		}
	}
	
	// *****************************************************************************
	// getter and setter methods
	// *****************************************************************************
	
	public HashMap<String, StructClass> getClasses() {
		return classes;
	}

}