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/*
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 */
package socket_programming;

/**
 *
 * @author sozen
 */
import java.io.* ;
import java.net.* ;
import java.util.* ;

final class HttpRequest implements Runnable {
    final static String CRLF = "\r\n";
    Socket socket;

    // Constructor
    public HttpRequest(Socket socket) throws Exception {
	this.socket = socket;
    }

    // Implement the run() method of the Runnable interface.
    public void run() {
	try {
	    processRequest();
	} catch (Exception e) {
	    System.out.println(e);
	}
    }

    private void processRequest() throws Exception {
	// Get a reference to the socket's input and output streams.
	InputStream is = ........................................;
	DataOutputStream os = ........................................;

	// Set up input stream filters.
	BufferedReader br = ........................................;

        // Get the request line of the HTTP request message.
        String requestLine = ........................................;

        // Extract the filename from the request line.
        StringTokenizer tokens = new StringTokenizer(requestLine);
        tokens.nextToken();  // skip over the method, which should be "GET"
        String fileName = tokens.nextToken();

        // Prepend a "." so that file request is within the current directory.
        fileName = "." + fileName ;

	// Open the requested file.
        FileInputStream fis = null ;
        boolean fileExists = true ;
        try {
	    fis = new FileInputStream(fileName);
        } catch (FileNotFoundException e) {
	    fileExists = false ;
        }

	// Debug info for private use
	System.out.println("Incoming!!!");
	System.out.println(requestLine);
	String headerLine = null;
	while ((headerLine = br.readLine()).length() != 0) {
	    System.out.println(headerLine);
	}

	// Construct the response message.
        String statusLine = null;
        String contentTypeLine = null;
        String entityBody = null;
        if (fileExists) {
	    statusLine = "HTTP/1.0 200 OK" + CRLF;
	    contentTypeLine = "Content-Type: " +
		contentType(fileName) + CRLF;
        } else {
	    statusLine = "HTTP/1.0 " + CRLF;
	    contentTypeLine = "Content-Type: text/html" + CRLF;
	    entityBody = "<HTML>" +
		"<HEAD><TITLE>FILE COULD NOT BE FOUND</TITLE></HEAD>" +
		"<BODY></BODY></HTML>";
        }
	// Send the status line.
        os.writeBytes(statusLine);


        // Send the content type line.
        os.writeBytes(contentTypeLine);

        // Send a blank line to indicate the end of the header lines.
        os.writeBytes(CRLF);

        // Send the entity body.
        if (fileExists) {
	    sendBytes(fis, os);
	    fis.close();
        } else {
	    os.writeBytes(entityBody) ;
            os.writeBytes("<html><body><h1>FILE DOES NOT EXIST </h1><p>TRY AGAIN</p></body></html>");
        }

        // Close streams and socket.
        os.close();
        br.close();
        socket.close();
    }

    private static void sendBytes(FileInputStream fis,
				  OutputStream os) throws Exception {
	// Construct a 1K buffer to hold bytes on their way to the socket.
	byte[] buffer = new byte[1024];
	int bytes = 0;

	// Copy requested file into the socket's output stream.
	while ((bytes = fis.read(buffer)) != -1) {
	    os.write(buffer, 0, bytes);
	}
    }

    private static String contentType(String fileName) {
	if(fileName.endsWith(".htm") || fileName.endsWith(".html")) {
	    return "text/html";
	}
	if(fileName.endsWith(".ram") || fileName.endsWith(".ra")) {
	    return "audio/x-pn-realaudio";
	}
	return "application/octet-stream" ;
    }
}