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/****************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one   *
 * or more contributor license agreements.  See the NOTICE file *
 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
 * with the License.  You may obtain a copy of the License at   *
 *                                                              *
 *   http://www.apache.org/licenses/LICENSE-2.0                 *
 *                                                              *
 * Unless required by applicable law or agreed to in writing,   *
 * software distributed under the License is distributed on an  *
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
 * KIND, either express or implied.  See the License for the    *
 * specific language governing permissions and limitations      *
 * under the License.                                           *
 ****************************************************************/
package org.apache.james.imapserver.netty;

import java.io.IOException;
import java.io.InputStream;

import org.apache.james.imap.api.display.HumanReadableText;
import org.apache.james.imap.decode.DecodingException;
import org.apache.james.imap.decode.base.EolInputStream;
import org.apache.james.imap.decode.base.FixedLengthInputStream;
import org.jboss.netty.channel.Channel;

public class NettyStreamImapRequestLineReader extends AbstractNettyImapRequestLineReader {

    private InputStream in;

    public NettyStreamImapRequestLineReader(Channel channel, InputStream in, boolean retry) {
        super(channel, retry);
        this.in = in;
    }

    /**
     * Reads the next character in the current line. This method will continue
     * to return the same character until the {@link #consume()} method is
     * called.
     * 
     * @return The next character TODO: character encoding is variable and
     *         cannot be determine at the token level; this char is not accurate
     *         reported; should be an octet
     * @throws DecodingException
     *             If the end-of-stream is reached.
     */
    public char nextChar() throws DecodingException {
        if (!nextSeen) {
            int next = -1;

            try {
                next = in.read();
            } catch (IOException e) {
                throw new DecodingException(HumanReadableText.SOCKET_IO_FAILURE, "Error reading from stream.", e);
            }
            if (next == -1) {
                throw new DecodingException(HumanReadableText.ILLEGAL_ARGUMENTS, "Unexpected end of stream.");
            }

            nextSeen = true;
            nextChar = (char) next;
        }
        return nextChar;
    }

    /**
     * Reads and consumes a number of characters from the underlying reader,
     * filling the char array provided. TODO: remove unnecessary copying of
     * bits; line reader should maintain an internal ByteBuffer;
     * 
     * @param size
     *            number of characters to read and consume
     * @param extraCRLF
     *            Add extra CRLF
     * @throws DecodingException
     *             If a char can't be read into each array element.
     */
    public InputStream read(int size, boolean extraCRLF) throws DecodingException {

        // Unset the next char.
        nextSeen = false;
        nextChar = 0;
        FixedLengthInputStream fin = new FixedLengthInputStream(this.in, size);
        if (extraCRLF) {
            return new EolInputStream(this, fin);
        } else {
            return fin;
        }
    }

    public void dispose() throws IOException {
        in.close();
    }

}