/*******************************************************************************
 * Copyright (c) 2006, 2011 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.apt.util;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.Charset;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import javax.lang.model.element.Modifier;
import javax.lang.model.element.NestingKind;
import javax.tools.JavaFileObject;

import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException;

/**
 * Implementation of a Java file object that corresponds to an entry in a zip/jar file
 */
public class ArchiveFileObject implements JavaFileObject {
	private ZipEntry zipEntry;
	private ZipFile zipFile;
	private String entryName;
	private File file;
	private Charset charset;
	
	public ArchiveFileObject(File file, ZipFile zipFile, String entryName, Charset charset) {
		this.zipFile = zipFile;
		this.zipEntry = zipFile.getEntry(entryName);
		this.entryName = entryName;
		this.file = file;
		this.charset = charset;
	}

	/* (non-Javadoc)
	 * @see javax.tools.JavaFileObject#getAccessLevel()
	 */
	public Modifier getAccessLevel() {
		// cannot express multiple modifier
		if (getKind() != Kind.CLASS) {
			return null;
		}
		ClassFileReader reader = null;
		try {
			reader = ClassFileReader.read(this.zipFile, this.entryName);
		} catch (ClassFormatException e) {
			// ignore
		} catch (IOException e) {
			// ignore
		}
		if (reader == null) {
			return null;
		}
		final int accessFlags = reader.accessFlags();
		if ((accessFlags & ClassFileConstants.AccPublic) != 0) {
			return Modifier.PUBLIC;
		}
		if ((accessFlags & ClassFileConstants.AccAbstract) != 0) {
			return Modifier.ABSTRACT;
		}
		if ((accessFlags & ClassFileConstants.AccFinal) != 0) {
			return Modifier.FINAL;
		}
		return null;
	}

	/* (non-Javadoc)
	 * @see javax.tools.JavaFileObject#getKind()
	 */
	public Kind getKind() {
		String name = this.entryName.toLowerCase();
		if (name.endsWith(Kind.CLASS.extension)) {
			return Kind.CLASS;
		} else if (name.endsWith(Kind.SOURCE.extension)) {
			return Kind.SOURCE;
		} else if (name.endsWith(Kind.HTML.extension)) {
			return Kind.HTML;
		}
		return Kind.OTHER;
	}

	/* (non-Javadoc)
	 * @see javax.tools.JavaFileObject#getNestingKind()
	 */
	public NestingKind getNestingKind() {
		switch(getKind()) {
			case SOURCE :
				return NestingKind.TOP_LEVEL;
			case CLASS :
        		ClassFileReader reader = null;
        		try {
        			reader = ClassFileReader.read(this.zipFile, this.entryName);
        		} catch (ClassFormatException e) {
        			// ignore
        		} catch (IOException e) {
        			// ignore
        		}
        		if (reader == null) {
        			return null;
        		}
        		if (reader.isAnonymous()) {
        			return NestingKind.ANONYMOUS;
        		}
        		if (reader.isLocal()) {
        			return NestingKind.LOCAL;
        		}
        		if (reader.isMember()) {
        			return NestingKind.MEMBER;
        		}
        		return NestingKind.TOP_LEVEL;
        	default:
        		return null;
		}
	}

	/* (non-Javadoc)
	 * @see javax.tools.JavaFileObject#isNameCompatible(java.lang.String, javax.tools.JavaFileObject.Kind)
	 */
	public boolean isNameCompatible(String simpleName, Kind kind) {
		return this.zipEntry.getName().endsWith(simpleName + kind.extension);
	}

	/* (non-Javadoc)
	 * @see javax.tools.FileObject#delete()
	 */
	public boolean delete() {
		throw new UnsupportedOperationException();
	}

	public boolean equals(Object o) {
		if (!(o instanceof ArchiveFileObject)) {
			return false;
		}
		ArchiveFileObject archiveFileObject = (ArchiveFileObject) o;
		return archiveFileObject.toUri().equals(this.toUri());
	}

	/* (non-Javadoc)
	 * @see javax.tools.FileObject#getCharContent(boolean)
	 */
	public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
		if (getKind() == Kind.SOURCE) {
			return Util.getCharContents(this, ignoreEncodingErrors, org.eclipse.jdt.internal.compiler.util.Util.getZipEntryByteContent(this.zipEntry, this.zipFile), this.charset.name());
		}
		return null;
	}

	/* (non-Javadoc)
	 * @see javax.tools.FileObject#getLastModified()
	 */
	public long getLastModified() {
		return this.zipEntry.getTime(); // looks the closest from the last modification
	}

	/* (non-Javadoc)
	 * @see javax.tools.FileObject#getName()
	 */
	public String getName() {
		return this.zipEntry.getName();
	}

	/* (non-Javadoc)
	 * @see javax.tools.FileObject#openInputStream()
	 */
	public InputStream openInputStream() throws IOException {
		return this.zipFile.getInputStream(this.zipEntry);
	}

	/* (non-Javadoc)
	 * @see javax.tools.FileObject#openOutputStream()
	 */
	public OutputStream openOutputStream() throws IOException {
		throw new UnsupportedOperationException();
	}

	/* (non-Javadoc)
	 * @see javax.tools.FileObject#openReader(boolean)
	 */
	public Reader openReader(boolean ignoreEncodingErrors) throws IOException {
		throw new UnsupportedOperationException();
	}

	/* (non-Javadoc)
	 * @see javax.tools.FileObject#openWriter()
	 */
	public Writer openWriter() throws IOException {
		throw new UnsupportedOperationException();
	}

	/* (non-Javadoc)
	 * @see javax.tools.FileObject#toUri()
	 */
	public URI toUri() {
		try {
			return new URI("jar:" + this.file.toURI().getPath() + "!" + this.zipEntry.getName()); //$NON-NLS-1$//$NON-NLS-2$
		} catch (URISyntaxException e) {
			return null;
		}
	}
	

    @Override
    public String toString() {
        return this.file.getAbsolutePath() + "[" + this.zipEntry.getName() + "]";//$NON-NLS-1$//$NON-NLS-2$
    }	
}