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/*
    This file is part of sdmx-sax.

Copyright 2015 James Stanley Gardner
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
DEALINGS IN THE SOFTWARE.

*/
package sdmx.version.common;

import java.io.*;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;

public class SOAPStrippingInputStream extends FilterInputStream {

    LinkedList inQueue = new LinkedList();
    LinkedList outQueue = new LinkedList();
    final byte[] stripStart, stripEnd;
    boolean started = false;
    boolean finished = false;

    public SOAPStrippingInputStream(InputStream in, String stripStart,
            String stripEnd) {
        super(in);
        this.stripStart = stripStart.getBytes();
        this.stripEnd = stripEnd.getBytes();
        //System.out.println("StartTag=" + stripStart);
        try {
            readToStart();
        } catch (IOException ex) {
            Logger.getLogger(SOAPStrippingInputStream.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    private boolean isMatchFound() {
        if (!started) {
            Iterator inIter = inQueue.iterator();
            for (int i = 0; i < stripStart.length; i++) {
                if (!inIter.hasNext() || stripStart[i] != inIter.next()) {
                    return false;
                }
            }
            return true;
        } else {
            Iterator inIter = inQueue.iterator();
            for (int i = 0; i < stripEnd.length; i++) {
                if (!inIter.hasNext() || stripEnd[i] != inIter.next()) {
                    return false;
                }
            }
            return true;
        }
    }

    private void readAhead() throws IOException {
        // Work up some look-ahead.
        // main difference here is the length we look ahead by
        // if we have started, we look at the stripEnd length
        // if we haven't started we look at the stripStart length
        if (started) {
            while (inQueue.size() < stripEnd.length) {
                int next = super.read();
            //System.out.print((char)next);
                //System.out.print((char)next);
                inQueue.offer(next);
                if (next == -1) {
                    throw new IOException("Stream Closed");
                }
            }
        } else {
            while (inQueue.size() < stripStart.length) {
                int next = super.read();
            //System.out.print((char)next);
                //System.out.print((char)next);
                inQueue.offer(next);
                if (next == -1) {
                    throw new IOException("Stream Closed");
                }
            }
        }
    }

    public void readToStart() throws IOException {
        char c = (char) read();
        while (!started) {
            c = (char) read();
        }
        while (c == '\r' || c == '\n') {
            c = (char) read();
        }
        if (c != '\r' && c != '\n') {
        outQueue.addFirst((int) c);
        }
    }

    @Override
    public int read() throws IOException {

        // Next byte already determined.
        if (outQueue.isEmpty()) {

            readAhead();

            if (isMatchFound()) {
                if (started) {
                    finished = true;
                }
                if (!started) {
                    started = true;
                }
                if (!finished) {
                    for (int i = 0; i < stripStart.length; i++) {
                        inQueue.remove();
                    }
                    readAhead();
                    Iterator it = inQueue.iterator();
                    while (it.hasNext()) {
                        outQueue.add((Integer) it.next());
                        it.remove();
                    }
                } else {
                    Iterator it = inQueue.iterator();
                    while (it.hasNext()) {
                        it.next();
                        it.remove();
                    }
                    return -1;
                }
            } else {
                outQueue.add(inQueue.remove());
            }
        }
        if (finished) {
            return -1;
        }
        int k = outQueue.remove();
        return k;
    }

    public int read(byte[] b) throws IOException {
        int i = 0;
        while (i < b.length) {
            int r = read();
            if (r == -1) {
                if (i == 0) {
                    return -1;
                }
                return i;
            }
            b[i] = (byte) r;
            i++;
        }
        return i;
    }

    public int read(byte[] b, int off, int len) throws IOException {
        int i = off;
        int read = 0;
        while (read < len) {
            int r = read();
            if (r == -1) {
                if (read == 0) {
                    return -1;
                }
                return read;
            }
            b[i++] = (byte) r;
            read++;
        }
        return read;
    }
    // TODO: Override the other read methods.
}