import std.file;
import std.string;
import std.stdio;
import std.stream;
import std.socketstream;
import std.socket;

class HttpDownload {	
	public:
		this() {}
		
		void downloadFile(char[] domain, char[] dir, char[] file, int port = 80) {
			Socket sock = new TcpSocket(new InternetAddress(domain, port));
			SocketStream ss = new SocketStream(sock);
			
			// we prepare the request
			if ( port != 80 )
				domain = domain ~ ":" ~ cast(char)port;
			
			char[] request = "GET " ~ dir ~ "/" ~ file ~ " HTTP/1.1\r\n"
				~ "Connection: Keep-Alive\r\n"
				~ "User-Agent: Mozilla 5.0\r\n"
				~ "Host: " ~ domain ~ "\r\n"
				~ "\r\n";
			
			// we send the request
			ss.writeString(request);
			
			// this for removes the HTTP header and looks for a positive response
			// from the webserver
			for(;;) {
				char[] response = ss.readLine();
				char[] RESPONSE = "HTTP/1.1 ";
				
				if(!response.length) {
					break;
				} else {
					if (response.length > RESPONSE.length && !icmp(RESPONSE, response[0 .. RESPONSE.length])) {
						char[] code;
						code = response[RESPONSE.length .. response.length];
						int i = ifind(code, "200 OK");
						if ( i != -1 ) {
							writefln("---> Received a 200 OK");
						} else {
							throw new Exception("Webserver has replied with an error");
							return;
						}
					}
				}
			}
			
			// write file
			BufferedFile s = new BufferedFile();
			s.create(getcwd() ~ "/" ~ file);
			ubyte[1] b;
			while(ss.read(b) != 0){
				s.write(b);
			}
			ss.close();
			s.close();
		}
}

int main() {
	HttpDownload download = new HttpDownload();
	download.downloadFile("www.capponcino.it", "/tremulous/dl/pk3", "highrise-b4.pk3", 80);
	return 0;
}