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package com.fireflysource.net.http.common.v2.decoder;

import com.fireflysource.common.io.BufferUtils;
import com.fireflysource.common.slf4j.LazyLogger;
import com.fireflysource.common.sys.SystemLogger;
import com.fireflysource.net.http.common.v2.frame.ErrorCode;
import com.fireflysource.net.http.common.v2.frame.PrefaceFrame;

import java.nio.ByteBuffer;

public class PrefaceParser {
    public static final LazyLogger LOG = SystemLogger.create(PrefaceParser.class);

    private final Parser.Listener listener;
    private int cursor;

    public PrefaceParser(Parser.Listener listener) {
        this.listener = listener;
    }

    /**
     * Advances this parser after the {@link PrefaceFrame#PREFACE_PREAMBLE_BYTES}.
     * This allows the HTTP/1.1 parser to parse the preamble of the preface,
     * which is a legal HTTP/1.1 request, and this parser will parse the remaining
     * bytes, that are not parseable by a HTTP/1.1 parser.
     */
    protected void directUpgrade() {
        if (cursor != 0)
            throw new IllegalStateException();
        cursor = PrefaceFrame.PREFACE_PREAMBLE_BYTES.length;
    }

    public boolean parse(ByteBuffer buffer) {
        while (buffer.hasRemaining()) {
            int currByte = buffer.get();
            if (currByte != PrefaceFrame.PREFACE_BYTES[cursor]) {
                BufferUtils.clear(buffer);
                notifyConnectionFailure(ErrorCode.PROTOCOL_ERROR.code, "invalid_preface");
                return false;
            }
            ++cursor;
            if (cursor == PrefaceFrame.PREFACE_BYTES.length) {
                cursor = 0;
                if (LOG.isDebugEnabled())
                    LOG.debug("Parsed preface bytes from {}", buffer);
                return true;
            }
        }
        return false;
    }

    protected void notifyConnectionFailure(int error, String reason) {
        try {
            listener.onConnectionFailure(error, reason);
        } catch (Throwable x) {
            LOG.info("Failure while notifying listener " + listener, x);
        }
    }
}