/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.catalina.webresources;

import java.io.File;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.security.cert.Certificate;
import java.util.jar.Manifest;

import org.apache.catalina.WebResourceRoot;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;

/**
 * Represents a JAR file as a resource root within a web application.
 */
public class JarResourceRoot extends AbstractResource {

    private static final Log log = LogFactory.getLog(JarResourceRoot.class);

    private final File base;
    private final String baseUrl;
    private final String name;

    /**
     * Constructs a new JarResourceRoot.
     *
     * @param root the resource root
     * @param base the base file
     * @param baseUrl the base URL
     * @param webAppPath the web application path
     */
    public JarResourceRoot(WebResourceRoot root, File base, String baseUrl, String webAppPath) {
        super(root, webAppPath);
        // Validate the webAppPath before going any further
        if (!webAppPath.endsWith("/")) {
            throw new IllegalArgumentException(sm.getString("jarResourceRoot.invalidWebAppPath", webAppPath));
        }
        this.base = base;
        this.baseUrl = "jar:" + baseUrl;
        // Extract the name from the webAppPath
        // Strip the trailing '/' character
        String resourceName = webAppPath.substring(0, webAppPath.length() - 1);
        int i = resourceName.lastIndexOf('/');
        if (i > -1) {
            resourceName = resourceName.substring(i + 1);
        }
        name = resourceName;
    }

    @Override
    public long getLastModified() {
        return base.lastModified();
    }

    @Override
    public boolean exists() {
        return true;
    }

    @Override
    public boolean isVirtual() {
        return false;
    }

    @Override
    public boolean isDirectory() {
        return true;
    }

    @Override
    public boolean isFile() {
        return false;
    }

    @Override
    public boolean delete() {
        return false;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public long getContentLength() {
        return -1;
    }

    @Override
    public String getCanonicalPath() {
        return null;
    }

    @Override
    public boolean canRead() {
        return true;
    }

    @Override
    protected InputStream doGetInputStream() {
        return null;
    }

    @Override
    public byte[] getContent() {
        return null;
    }

    @Override
    public long getCreation() {
        return base.lastModified();
    }

    @Override
    public URL getURL() {
        String url = baseUrl + "!/";
        try {
            return new URI(url).toURL();
        } catch (MalformedURLException | URISyntaxException | IllegalArgumentException e) {
            if (log.isDebugEnabled()) {
                log.debug(sm.getString("fileResource.getUrlFail", url), e);
            }
            return null;
        }
    }

    @Override
    public URL getCodeBase() {
        try {
            return new URI(baseUrl).toURL();
        } catch (MalformedURLException | URISyntaxException e) {
            if (getLog().isDebugEnabled()) {
                getLog().debug(sm.getString("fileResource.getUrlFail", baseUrl), e);
            }
            return null;
        }
    }

    @Override
    protected Log getLog() {
        return log;
    }

    @Override
    public Certificate[] getCertificates() {
        return null;
    }

    @Override
    public Manifest getManifest() {
        return null;
    }
}
