/**

 * Back 2 Browser Bytecode Translator

 * Copyright (C) 2012-2015 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 2 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. Look for COPYING file in the top folder.

 * If not, see http://opensource.org/licenses/GPL-2.0.

 */

package org.apidesign.bck2brwsr.emul.zip;

import java.io.IOException;

import java.io.InputStream;

import java.util.zip.ZipEntry;

/**

 *

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 */

final class ZipArchive {

    private Entry first;

    public static ZipArchive createZip(InputStream is) throws IOException {

        ZipArchive a = new ZipArchive();

        readZip(is, a);

        return a;

    }

    public static ZipArchive createReal(InputStream is) throws IOException {

        ZipArchive a = new ZipArchive();

        realZip(is, a);

        return a;

    }

    /**

     * Registers entry name and data

     */

    final void register(String entry, InputStream is) throws IOException {

        byte[] arr = new byte[12 * 4096];

        for (int i = 0; i < arr.length; i++) {

            int ch = is.read();

            if (ch == -1) {

                byte[] tmp = new byte[i];

                FastJar.arraycopy(arr, 0, tmp, 0, i);

                arr = tmp;

                break;

            }

            arr[i] = (byte) ch;

        }

        first = new Entry (entry, arr, first);

    }

    @Override

    public String toString() {

        StringBuilder sb = new StringBuilder();

        Entry e = first;

        while (e != null) {

            String string = e.name;

            byte[] bs = e.arr;

            sb.append(string).append(" = ").append(toString(bs)).append("\n");

            e = e.next;

        }

        return sb.toString();

    }

    public void assertEquals(ZipArchive zip, String msg) {

        boolean ok = true;

        StringBuilder sb = new StringBuilder();

        sb.append(msg);

        Entry e = first;

        while (e != null) {

            String string = e.name;

            byte[] bs = e.arr;

            byte[] other = zip.find(string);

            e = e.next;

            sb.append("\n");

            if (other == null) {

                sb.append("EXTRA ").append(string).append(" = ").append(toString(bs));

                ok = false;

                continue;

            }

            if (equals(bs, other)) {

                sb.append("OK    ").append(string);

                continue;

            } else {

                sb.append("DIFF  ").append(string).append(" = ").append(toString(bs)).append("\n");

                sb.append("    TO").append(string).append(" = ").append(toString(other)).append("\n");

                ok = false;

                continue;

            }

        }

        e = zip.first;

        while (e != null) {

            String string = e.name;

            if (find(string) == null) {

                sb.append("MISS  ").append(string).append(" = ").append(toString(e.arr));

                ok = false;

            }

            e = e.next;

        }

        if (!ok) {

            assert false : sb.toString();

        }

    }

    public static void readZip(InputStream is, ZipArchive data) throws IOException {

        ZipInputStream zip = new org.apidesign.bck2brwsr.emul.zip.ZipInputStream(is);

        for (;;) {

            ZipEntry en = zip.getNextEntry();

            if (en == null) {

                return;

            }

            data.register(en.getName(), zip);

        }

    }

    public static void realZip(InputStream is, ZipArchive data) throws IOException {

        java.util.zip.ZipInputStream zip = new java.util.zip.ZipInputStream(is);

        for (;;) {

            ZipEntry en = zip.getNextEntry();

            if (en == null) {

                return;

            }

            data.register(en.getName(), zip);

        }

    }

    private byte[] find(String name) {

        Entry e = first;

        while (e != null) {

            if (e.name.equals(name)) {

                return e.arr;

            }

            e = e.next;

        }

        return null;

    }

    private boolean equals(byte[] bs, byte[] other) {

        if (bs.length != other.length) {

            return false;

        }

        for (int i = 0; i < bs.length; i++) {

            if (bs[i] != other[i]) {

                return false;

            }

        }

        return true;

    }

    private Object toString(byte[] arr) {

        StringBuilder sb = new StringBuilder();

        sb.append("[");

        String sep = "";

        for (int i = 0; i < arr.length; i++) {

            sb.append(sep).append(arr[i]);

            sep = ", ";

        }

        sb.append("]");

        return sb.toString();

    }

    private static final class Entry {

        final String name;

        final byte[] arr;

        final Entry next;

        public Entry(String name, byte[] arr, Entry next) {

            this.name = name;

            this.arr = arr;

            this.next = next;

        }

    }

}