import synthesijer.lib.upl.UPLInputPort;
import synthesijer.lib.upl.UPLOutputPort;


public class SimpleHttpServer {
	
	UPLInputPort inport = new UPLInputPort();
	UPLOutputPort outport = new UPLOutputPort();

	private int[] data = new int[1024];
	
	private int pack(char a, char b, char c, char d){
		return (((int)a&0xFF) << 24) + (((int)b&0xFF) << 16) + (((int)c&0xFF) << 8) + ((int)d&0xFF);
	}
	
	private final HttpResponseHeader resp = new HttpResponseHeader();
	
	private int content_words = 8;
	private int content_length_field = 0x33322020; // "32  " 
	
	private void init(){
		
		data[0] = pack('<', 'h', 't', 'm');
		data[1] = pack('l', '>', '<', 'b');
		data[2] = pack('o', 'd', 'y', '>');
		data[3] = pack('T', 'e', 's', 't');
		data[4] = pack('<', '/', 'b', 'o');
		data[5] = pack('d', 'y', '>', '<');
		data[6] = pack('/', 'h', 't', 'm');
		data[7] = pack('l', '>', '\n', '\n');
		
		content_words = 8; 
		content_length_field = 0x33322020; // "32  " 
		
	}
		
	private void run(){
		
		outport.kick = false;

		while(inport.ready == false){;}
		
		int ip_src = inport.data[0];
		int ip_dest = inport.data[1];
		int port_src_dest = inport.data[2];
		int length = inport.data[3] & 0x0000FFFF;
		
		if(length == 0){
			inport.done = true;
			inport.done = false;
			return; // should be fin, nothing to do. 
		}
		
		// header
		for(int i = 0; i < resp.length; i++){
			int v = resp.data[i];
			outport.data[i+4] = v;
		}
		outport.data[8+4] = content_length_field;
		
		// data
		int offset = resp.length;
		for(int i = 0; i < content_words; i++){
			int v = data[i];
			outport.data[i+4+offset] = v;
		}
		
		outport.data[0] = ip_src;
		outport.data[1] = ip_dest;
		outport.data[2] = port_src_dest;
		outport.data[3] = (resp.length + content_words) << 2;
		outport.send_length = 4 + resp.length + content_words;
		inport.done = true;
		inport.done = false;
		outport.kick = true;
		outport.kick = false;
	}
	
	public void main(){
		init();
		while(true){
			run();
		}
	}
	
	

}