package org.apache.axis2.deployment.resolver;

import org.apache.axis2.deployment.DeploymentConstants;
import org.apache.axis2.deployment.util.Utils;
import org.apache.ws.commons.schema.resolver.DefaultURIResolver;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.xml.sax.InputSource;

import java.io.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.net.URI;
/*
 * Copyright 2004,2005 The Apache Software Foundation.
 *
 * 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.
 */

/**
 * A custom URI resolver that can
 */
public class AARFileBasedURIResolver extends DefaultURIResolver {

    protected static final Log log = LogFactory
            .getLog(AARFileBasedURIResolver.class);

    private File aarFile;
    private URI lastImportLocation;

    public AARFileBasedURIResolver(File aarFile) {
        this.aarFile = aarFile;
    }

    public InputSource resolveEntity(
            String targetNamespace,
            String schemaLocation,
            String baseUri) {
        //no issue with
        if (isAbsolute(schemaLocation)) {
            return super.resolveEntity(
                    targetNamespace, schemaLocation, baseUri);
        } else {
            //validate
            if ((baseUri == null || "".equals(baseUri)) && schemaLocation.startsWith("..")) {
                throw new RuntimeException(
                        "Unsupported schema location " + schemaLocation);
            }

            lastImportLocation = URI.create(baseUri).resolve(schemaLocation);
            ZipInputStream zin = null;
            try {
                zin = new ZipInputStream(new FileInputStream(aarFile));

                ZipEntry entry;
                byte[] buf = new byte[1024];
                int read;
                ByteArrayOutputStream out;
                String searchingStr = lastImportLocation.toString();
                while ((entry = zin.getNextEntry()) != null) {
                    String entryName = entry.getName().toLowerCase();
                    if (entryName.equalsIgnoreCase(searchingStr)) {
                        out = new ByteArrayOutputStream();
                        while ((read = zin.read(buf)) > 0) {
                            out.write(buf, 0, read);
                        }
                        ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
                        return new InputSource(in);
                    }
                }


            } catch (IOException e) {
                throw new RuntimeException(e);
            } finally {
                try {
                    if (zin != null) zin.close();
                } catch (IOException e) {
                    log.debug(e);
                }
            }

        }

        log.info("AARFileBasedURIResolver: Unable to resolve" + lastImportLocation);
        return null;
    }
}