/*

 * Copyright (C) 2010 The IDEAL Group

 *

 * Licensed 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 com.ideal.webaccess;



import android.os.Environment;



import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.zip.ZipEntry;

import java.util.zip.ZipInputStream;



/**

 * Utility class for unzipping the JavaScript files.

 */

public class Unzipper {

    public static boolean unzip(InputStream stream) {

        String rootDirectory = Environment.getExternalStorageDirectory() + "/";

        FileOutputStream out;

        byte buf[] = new byte[16384];

        try {

            ZipInputStream zis = new ZipInputStream(stream);

            ZipEntry entry = zis.getNextEntry();

            while (entry != null) {

                if (entry.isDirectory()) {

                    File newDir = new File(rootDirectory + entry.getName());

                    newDir.mkdir();

                } else {

                    String name = entry.getName();

                    File outputFile = new File(rootDirectory + name);

                    String outputPath = outputFile.getCanonicalPath();

                    name = outputPath.substring(outputPath.lastIndexOf("/") + 1);

                    outputPath = outputPath.substring(0, outputPath.lastIndexOf("/"));

                    File outputDir = new File(outputPath);

                    outputDir.mkdirs();

                    outputFile = new File(outputPath, name);

                    outputFile.createNewFile();

                    out = new FileOutputStream(outputFile);



                    int numread = 0;

                    do {

                        numread = zis.read(buf);

                        if (numread <= 0) {

                            break;

                        } else {

                            out.write(buf, 0, numread);

                        }

                    } while (true);

                    out.close();

                }

                entry = zis.getNextEntry();

            }

            return true;

        } catch (IOException e) {

            e.printStackTrace();

            return false;

        }



    }



    public static boolean doDataCheckAndUnzip(InputStream dataSourceStream) {

        final String basePath = Environment.getExternalStorageDirectory() + "/ideal-webaccess/js/";



        final String[] dataFiles = {

                "clc-domUtils.js", "ideal-dom.js", "ideal-globals.js", "ideal-interface.js",

                "ideal-keyhandler.js", "ideal-lens.js", "ideal-loader.js",

                "ideal-loader_webreader.js", "ideal-nav.js", "ideal-styler.js", "ideal-tts.js",

                "ideal-webaccess.user.js", "sitescripts/googlesearch/mgws.js"

        };



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

            if (!(new File(basePath + dataFiles[i])).exists()) {

                return unzip(dataSourceStream);

            }

        }

        return true;

    }

}