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package org.opengis.cite.ogcapitiles10.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.util.logging.Level;

import javax.ws.rs.core.HttpHeaders;

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;

/**
 * Provides a collection of utility methods for manipulating or resolving URI references.
 */
public class URIUtils {

	/**
	 * Dereferences the given URI and stores the resulting resource representation in a
	 * local file. The file will be located in the default temporary file directory.
	 * @param uriRef An absolute URI specifying the location of some resource.
	 * @return A File containing the content of the resource; it may be empty if
	 * resolution failed for any reason.
	 * @throws IOException If an IO error occurred.
	 */
	public static File dereferenceURI(URI uriRef) throws IOException {
		if ((null == uriRef) || !uriRef.isAbsolute()) {
			throw new IllegalArgumentException("Absolute URI is required, but received " + uriRef);
		}
		if (uriRef.getScheme().equalsIgnoreCase("file")) {
			return new File(uriRef);
		}
		Client client = Client.create();
		WebResource webRes = client.resource(uriRef);
		ClientResponse rsp = webRes.get(ClientResponse.class);
		String suffix = null;
		if (rsp.getHeaders().getFirst(HttpHeaders.CONTENT_TYPE).endsWith("xml")) {
			suffix = ".xml";
		}
		File destFile = File.createTempFile("entity-", suffix);
		if (rsp.hasEntity()) {
			InputStream is = rsp.getEntityInputStream();
			OutputStream os = new FileOutputStream(destFile);
			byte[] buffer = new byte[8 * 1024];
			int bytesRead;
			while ((bytesRead = is.read(buffer)) != -1) {
				os.write(buffer, 0, bytesRead);
			}
			is.close();
			os.flush();
			os.close();
		}
		TestSuiteLogger.log(Level.FINE,
				"Wrote " + destFile.length() + " bytes to file at " + destFile.getAbsolutePath());
		return destFile;
	}

}