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/*
 * Created on 16/02/2005
 *
 * Copyright (c) 2005, Zur Aougav, [email protected]
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice, this list 
 * of conditions and the following disclaimer. 
 * 
 * Redistributions in binary form must reproduce the above copyright notice, this 
 * list of conditions and the following disclaimer in the documentation and/or 
 * other materials provided with the distribution. 
 * 
 * Neither the name of the Zur Aougav nor the names of its contributors may be 
 * used to endorse or promote products derived from this software without specific 
 * prior written permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.fasteasytrade.jrandtest.io;

import java.io.DataInputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * This class represents an encrypted or random source HTTP Url source.
 * 
 * Data, bytes or int32, are read from url.
 * 
 * @author Zur Aougav
 *  
 */
public class HttpGetUrlRandomStream implements RandomStream {

    boolean open = false;

    DataInputStream infile = null;

    String filename = null; // the url string name

    URL url = null;

    URLConnection con = null;

    int lengthOfData = 0; // length of data return from htpp get request

    int count = 0;

    int countLastRead = 0;

    final int SIZE = 4096 * 4;

    byte[] buffer = new byte[SIZE];

    public HttpGetUrlRandomStream() {
    }

    public HttpGetUrlRandomStream(String s) {
        filename = s;
    }

    @Override
    public String getFilename() {
        return filename;
    }

    @Override
    public void setFilename(String s) {
        filename = s;
    }

    @Override
    public boolean isOpen() {
        return open;
    }

    @Override
    public boolean openInputStream() {
        open = false;
        if (filename == null) {
            return false;
        }

        try {
            url = new URL(filename);
            con = url.openConnection();
            con.connect();
            lengthOfData = con.getContentLength();

            /*
             * debugging: list http headers returned from http get request
             */
            System.out.println(" headers for url: " + url);
            System.out.println(" lengthOfData = " + lengthOfData);
            Map> m = con.getHeaderFields();
            Set s = m.keySet();
            for (String x: s) {
                Object o = m.get(x);
                String y = null;
                if (o instanceof String) {
                    y = (String)o;
                } else if (o instanceof Collection) {
                    y = "" + o;
                } else if (o instanceof Integer) {
                    y = "" + o;
                } else {
                    y = o.getClass().getName();
                }
                System.out.println(" header " + x + " = " + y);
            }

            infile = new DataInputStream(con.getInputStream());
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
        open = true;
        count = 0;
        countLastRead = 0;
        return true;
    }

    @Override
    public boolean closeInputStream() {
        try {
            infile.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        open = false;
        return true;
    }

    @Override
    public byte readByte() {
        if (!isOpen()) {
            return -1;
        }

        try {
            if (count >= countLastRead) {
                count = 0;
                countLastRead = infile.read(buffer);
                if (countLastRead < 0) {
                    open = false;
                    return -1;
                }
            }
            byte temp = buffer[count];
            count++;
            return temp;
        } catch (Exception e) {
            open = false;
        }

        // passed end of file
        return -1;

    }

    @Override
    public int readInt() {
        int result = 0;
        for (int i = 0; i < 4; i++) {
            result = (result << 8) | (0xff & readByte());
            if (!isOpen()) {
                return -1;
            }
        }
        return result;
    }

    @Override
    public long readLong() {
        int result = 0;
        for (int i = 0; i < 8; i++) {
            result = (result << 8) | (0xff & readByte());
            if (!isOpen()) {
                return -1;
            }
        }
        return result;
    }

    /**
     * read one int from registered input random stream and divide it by
     * (2^32 - 1).
     * 
     * @return double number netween 0 and 1.
     */
    @Override
    public double read32BitsAsDouble() {
        return ((double)(0x00ffffffffL & readInt())) / (double)0x0ffffffffL;
    }

}