package protocolP2P;
import java.util.ArrayList;
import protocolP2P.Payload;
import protocolP2P.RequestResponseCode;
import exception.ProtocolError;
import exception.InternalError;

public class FileList extends Payload {
	private final static RequestResponseCode requestResponseCode = RequestResponseCode.LIST_RESPONSE;
	private ArrayList<String> content;

	public FileList(ArrayList<String> content) {
		this.content = content;
	}

	public FileList(byte[] datagram) throws ProtocolError, InternalError {
		//TODO
		/* assert to help debugging */
		assert RequestResponseCode.fromCode(datagram[RequestResponseCode.RRCODE_POSITION]) == RequestResponseCode.LIST_RESPONSE : "FileList subclass is incompatible with this datagram, request/response code must be checked before using this constructor";
		/* InternalErrorException */
		if (RequestResponseCode.fromCode(datagram[RequestResponseCode.RRCODE_POSITION]) != RequestResponseCode.LIST_RESPONSE) {
			throw new InternalError();
		}
		int size = (datagram[PAYLOAD_SIZE_POSITON] << (8*3)) | (datagram[PAYLOAD_SIZE_POSITON+1] << (8*2)) | (datagram[PAYLOAD_SIZE_POSITON+2] << 8) | datagram[PAYLOAD_SIZE_POSITON+3];
	
	}

	/** To datagram with padding */
	public byte[] toDatagram() {
		byte[] datagram; // java initialize all to zero
		// size is keep blank (ProtocolP2PDatagram will handle it)
		// set request/response code
		datagram[RequestResponseCode.RRCODE_POSITION] = requestResponseCode.codeValue;
		// bits 16-31 are reserved for future use
		//TODO size
		int size = ;
		for(i=0;i<4;i++) {
			datagram[Payload.PAYLOAD_SIZE_POSITON + i] = (byte) (size >> (8 * (3 - i)) & 0xFF);
		}
		//TODO content
	}
}