import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.zip.ZipEntry;

import java.util.zip.ZipInputStream;

import android.os.AsyncTask;

import android.util.Log;

/**

 * This is an AsyncTask which will download a zip from an URL and unzip it to a specified path

 * 

 *  a typical call to start the task would be new DownloadAsyncTask().execute(getExternalStorage(), "www.hedgewars.org/data.zip");

 * @author Xeli

 *

 */

public class DownloadAsyncTask extends AsyncTask<String, Object, Long> {

	private DownloadService service;

	private long lastUpdateMillis = 0;

	public DownloadAsyncTask(DownloadService _service){

		service = _service;

	}

	/**

	 * 

	 * @param params - 2 Strings, first is the path where the unzipped files will be stored, second is the URL to download from

	 */

	protected Long doInBackground(String... params) {

		HttpURLConnection conn = null;

		try {

			String rootZipDest = params[0];

			URL url = new URL(params[1]);

			conn = (HttpURLConnection)url.openConnection();

			String contentType = conn.getContentType();

			if(contentType == null || contentType.contains("zip")){ //Seeing as we provide the url if the contentType is unknown lets assume zips

				ZipInputStream input = new ZipInputStream(conn.getInputStream());

				int bytesDecompressed = 0;

				final int kbytesToProcess = conn.getContentLength()/1024;

				service.start(kbytesToProcess);

				ZipEntry entry = null;

				while((entry = input.getNextEntry()) != null){

					String fileName = entry.getName();

					if(isCancelled()) break;

					else if(System.currentTimeMillis() - lastUpdateMillis > 1000){

						lastUpdateMillis = System.currentTimeMillis();

						publishProgress(bytesDecompressed, kbytesToProcess, fileName);

					}

					bytesDecompressed += entry.getCompressedSize();

					File f = new File(rootZipDest + fileName);

					if(entry.isDirectory()){

						f.mkdir();

					}else{

						if(f.exists()){

							f.delete();

						}

						try {

							f.createNewFile();

							FileOutputStream out = new FileOutputStream(f);

							byte[] buffer = new byte[1024];

							int count = 0;

							while((count = input.read(buffer)) != -1){

								out.write(buffer, 0, count);

							}

							out.flush();

							out.close();

							input.closeEntry();

						} catch (FileNotFoundException e) {

							e.printStackTrace();

						} catch (IOException e) {

							e.printStackTrace();

						}

					}

				}

				input.close();

			}else{

				Log.e("bla", "contenttype = " + contentType);

			}

		} catch (IOException e) {

			e.printStackTrace();

		}finally{

			if(conn != null) conn.disconnect();

		}

		return null;

	}

	//TODO propper result handling

	protected void onPostExecute(Long result){

		service.done(true);

	}

	protected void onProgressUpdate(Object...objects){

		service.update((Integer)objects[0], (Integer)objects[1], (String)objects[2]);

	}

}