package org.hwo.net.http;

import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.Properties;

public class HttpServerRequest {

	public static class Factory implements HttpServerRequestFactory
	{
		@Override
		public HttpServerRequest createRequest(HttpServerConnection connection) throws IOException {
			return new HttpServerRequest(connection);
		}
	}
	
	HttpServerConnection connection;
	
	String	requestLine;
	String	requestMethod;
	String	requestProtocol;
	HttpRequestURI
			requestURI;
	
	Properties header;
	
	Integer		resultCode;
	Properties	responseHeader;
	byte[]		responseBody;
	
	ByteArrayOutputStream
				responseOutputStream;
	BufferedWriter
				responseBufferedWriter;
	
	boolean		responseSent;
	
	
	public HttpServerRequest(HttpServerConnection httpServerConnection) throws IOException
	{
		this.connection = httpServerConnection;
		this.header = new Properties();
		
		readRequest();
		readHeader();
		
		requestURI.decode();
		
		resultCode = 400;
		responseHeader = new Properties();
		responseOutputStream = new ByteArrayOutputStream();
		responseBufferedWriter = new BufferedWriter(new OutputStreamWriter(responseOutputStream));
		
	}
	
	public boolean isResponseSent()
	{
		return responseSent;
	}
	
	private void readRequest() throws IOException
	{
		this.requestLine = connection.getBufferedReader().readLine();
		String[] tokens = this.requestLine.split(" ",3);
		requestMethod = tokens[0];
		if (tokens.length > 1)
			requestURI = new HttpRequestURI(this,tokens[1]);
		if (tokens.length > 2)
			requestProtocol = tokens[2];
		
	}
	
	private void readHeader() throws IOException
	{
		String line;
		String headerName = null;
		StringBuilder headerValue = new StringBuilder();
		
		while (true)
		{
			line = connection.getBufferedReader().readLine();
			if ((line.length() == 0) || (line.charAt(0) > 32))
			{
				if (headerName != null)
				{
					header.setProperty(headerName, headerValue.toString());
				}
				if (line.length() > 0)
				{
					headerName = line.substring(0,line.indexOf(':'));
					headerValue = new StringBuilder();
					headerValue.append(line.substring(line.indexOf(':')+1).trim());
				} else
					return;
			} else
			{
				if (headerName != null)
					headerValue.append(line.trim());
			}
			
			
		}
	}
	
	public HttpRequestURI getRequestURI()
	{
		return requestURI;
	}

	public String getRequestHeader(String headerName)
	{
		return header.getProperty(headerName);
	}
	
	
	public OutputStream getResponseOutputStream()
	{
		return responseOutputStream;
	}
	public BufferedWriter getResponseWriter()
	{
		return responseBufferedWriter;
	}
	
	public void setResponseHeader(String headerName,String headerValue)
	{
		responseHeader.setProperty(headerName, headerValue);
	}
	
	
	public void sendResponse(int code,byte[] responseBody) throws IOException
	{
		this.responseBody = responseBody;
		this.resultCode = code;
		sendResponse();
	}
	
	public void sendResponse(int code) throws IOException
	{
		this.resultCode = code;		
		sendResponse();
	}
	
	
	public void sendResponse() throws IOException
	{
		if (responseSent)
			throw new IOException("The Response has already been sent.");
		
		responseSent = true;
		
		if (responseBody == null)
		{
			responseBufferedWriter.flush();
			if (responseOutputStream.size() > 0)
			{
				responseBody = responseOutputStream.toByteArray();
			} else
				responseBody = new byte[0];
		}
		
		responseHeader.setProperty("Content-Length", String.format("%d", responseBody.length));

		String protocol = "HTTP/1.0";
		if (requestProtocol != null)
			protocol = requestProtocol;
		
		connection.getBufferedWriter().write(String.format("%s %d\r\n", protocol, resultCode));

		Enumeration<?> headerEnum = responseHeader.keys();
		
		while (headerEnum.hasMoreElements())
		{
			String headerName = (String)headerEnum.nextElement();
			connection.getBufferedWriter().write(String.format("%s: %s\r\n", headerName, responseHeader.getProperty(headerName)));
		}
		
		connection.getBufferedWriter().write("\r\n");
		connection.getBufferedWriter().flush();
		connection.getClientSocket().getOutputStream().write(responseBody);
	}
	
}