/*

 * Hedgewars for Android. An Android port of Hedgewars, a free turn based strategy game

 * Copyright (c) 2011-2012 Richard Deurwaarder <xeli@xelification.com>

 *

 * 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; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 */

package org.hedgewars.hedgeroid;

import java.io.Closeable;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.ArrayList;

import java.util.List;

import android.annotation.TargetApi;

import android.content.Context;

import android.content.res.Resources;

import android.content.res.TypedArray;

import android.os.Build;

import android.os.Environment;

import android.util.Log;

public class Utils {

	private static final String ROOT_DIR = "Data";

	private static final String TAG = "org.hedgewars.hedgeroid";

	/**

	 * @return true if the data path is currently available. However, it can vanish at any time so

	 * normally you should just try to use it and rely on the exceptions.

	 */

	public static boolean isDataPathAvailable() {

		return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());

	}

	/**

	 * get the path to which we should download all the data files

	 * @param c context 

	 * @return The directory

	 * @throws FileNotFoundException if external storage is not avaliable at the moment

	 */

	public static File getCachePath(Context c) throws FileNotFoundException {

		File cachePath = null;

		if(Build.VERSION.SDK_INT < 8){//8 == Build.VERSION_CODES.FROYO

			cachePath = PreFroyoSDCardDir.getDownloadPath(c);

		} else {

			cachePath = FroyoSDCardDir.getDownloadPath(c);

		}

		if(cachePath==null) {

			throw new FileNotFoundException("External storage is currently unavailable");

		} else {

			return cachePath;

		}

	}

	public static File getDataPathFile(Context c) throws FileNotFoundException {

		return new File(getCachePath(c), ROOT_DIR);

	}

	// TODO Several callers are unaware that this may fail, so it throws an RTE now.

	// Should be handled better though.

	@Deprecated

	public static String getDataPath(Context c) {

		try {

			return getDataPathFile(c).getAbsolutePath()+"/";

		} catch(FileNotFoundException e) {

			throw new RuntimeException(e);

		}

	}

	@TargetApi(8)

	private static class FroyoSDCardDir{

		public static File getDownloadPath(Context c){

			return c.getExternalCacheDir();

		}

	}

	private static class PreFroyoSDCardDir{

		public static File getDownloadPath(Context c){

			if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){

				File extStorageDir = Environment.getExternalStorageDirectory();

				if(extStorageDir != null) {

					return new File(extStorageDir, "Hedgewars");

				}

			}

			return null;

		}

	}

	/**

	 * Get files from dirName, dir name is relative to {@link getDownloadPath}

	 * @param dirName

	 * @param c context

	 * @return string of files

	 */

	public static String[] getFileNamesFromRelativeDir(Context c, String dirName){

		String prefix = getDataPath(c);

		File f = new File(prefix + dirName);

		if(f.exists() && f.isDirectory()) return f.list();

		else{

			Log.e("Utils::", "Couldn't find dir: " + dirName);

			return new String[0];

		}

	}

	/**

	 * Return a File array with all the files from dirName

	 * @param c

	 * @param dirName

	 * @return

	 */

	public static File[] getFilesFromRelativeDir(Context c, String dirName){

		String prefix = getDataPath(c);

		File f = new File(prefix + dirName);

		if(f.exists() && f.isDirectory()) return f.listFiles();

		else {

			Log.e("Utils::", "Dir not found: " + dirName);

			return new File[0];

		}

	}

	/**

	 * Checks if this directory has a file with suffix suffix

	 * @param f - directory

	 * @return

	 */

	public static boolean hasFileWithSuffix(File f, String suffix){

		if(f.isDirectory()){

			for(String s : f.list()){

				if(s.endsWith(suffix)) return true;

			}

			return false;

		}else{

			return false;

		}

	}

	/**

	 * Gives back all dirs which contain a file with suffix fileSuffix

	 * @param c

	 * @param path

	 * @param fileSuffix

	 * @return

	 */

	public static List<String> getDirsWithFileSuffix(Context c, String path, String fileSuffix){

		File[] files = getFilesFromRelativeDir(c,path);

		ArrayList<String> ret = new ArrayList<String>();

		for(File f : files){

			if(hasFileWithSuffix(f, fileSuffix)) ret.add(f.getName());

		}

		return ret;

	}

	/**

	 * Get all files from directory dir which have the given suffix

	 * @param c

	 * @param dir

	 * @param suffix

	 * @param removeSuffix

	 * @return

	 */

	public static ArrayList<String> getFilesFromDirWithSuffix(Context c, String dir, String suffix, boolean removeSuffix){

		String[] files = Utils.getFileNamesFromRelativeDir(c, dir);

		ArrayList<String> ret = new ArrayList<String>();

		for(String s : files){

			if(s.endsWith(suffix)){

				if(removeSuffix) ret.add(s.substring(0, s.length()-suffix.length()));

				else ret.add(s);

			}

		}

		return ret;

	}

	/**

	 * Close a resource (possibly null), ignoring any IOException.

	 */

	public static void closeQuietly(Closeable c) {

		if(c!=null) {

			try {

				c.close();

			} catch(IOException e) {

				Log.w(TAG, e);

			}

		}

	}

	/**

	 * Write all data from the input stream to the file, creating or overwriting it.

	 * The input stream will be closed.

	 * 

	 * @throws IOException

	 */

	public static void writeStreamToFile(InputStream is, File file) throws IOException {

		OutputStream os = null;

		byte[] buffer = new byte[8192];

		try {

			os = new FileOutputStream(file);

			int size;

			while((size=is.read(buffer)) != -1) {

				os.write(buffer, 0, size);

			}

			os.close(); // Important to close this non-quietly, in case of exceptions when flushing

		} finally {

			Utils.closeQuietly(is);

			Utils.closeQuietly(os);

		}

	}

	/**

	 * Moves resources pointed to by sourceResId (from @res/raw/) to the app's private data directory

	 * @param c

	 * @param sourceResId

	 * @param directory

	 */

	public static void resRawToFilesDir(Context c, int sourceResId, String directory) throws IOException {

		File targetDir = new File(c.getFilesDir(), directory);

		targetDir.mkdirs();

		//Get an array with the resource files ID

		Resources resources = c.getResources();

		TypedArray ta = resources.obtainTypedArray(sourceResId);

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

			int resId =  ta.getResourceId(i, 0);

			String fileName = resources.getResourceEntryName(resId);

			File f = new File(targetDir, fileName);

			writeStreamToFile(resources.openRawResource(resId), f);

		}

	}

	/**

	 * Crashing - at least it's better than ignoring errors.

	 */

	public static void assertZero(int value, String text) {

		if(value != 0) {

			throw new RuntimeException("Result is not zero: " + text);

		}

	}

}