package org.hedgewars.mobile;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.ArrayList;

import android.content.Context;

import android.content.res.TypedArray;

import android.widget.Toast;

public class Utils {

	/**

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

	 * @param c context 

	 * @return absolute path

	 */

	public static String getDownloadPath(Context c){

		File f =  c.getExternalCacheDir();

		if(f != null){

			return f.getAbsolutePath() + "/Data/";

		}else{

			Toast.makeText(c, R.string.sdcard_not_mounted, Toast.LENGTH_LONG);

			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 = getDownloadPath(c);

		File f = new File(prefix + dirName);

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

		else throw new IllegalArgumentException("File not a directory or doesn't exist dirName = " + f.getAbsolutePath());

	}

	/**

	 * 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 = getDownloadPath(c);

		File f = new File(prefix + dirName);

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

		else throw new IllegalArgumentException("File not a directory or doesn't exist dirName = " + f.getAbsolutePath());

	}

	/**

	 * 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 String[] getDirsWithFileSuffix(Context c, String path, String fileSuffix){

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

		String[] validFiles = new String[files.length];

		int validCounter = 0;

		for(File f : files){

			if(hasFileWithSuffix(f, fileSuffix)) validFiles[validCounter++] = f.getName();

		}

		String[] ret = new String[validCounter];

		System.arraycopy(validFiles, 0, ret, 0, validCounter);

		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;

	}

    /**

     * 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){

		byte[] buffer = new byte[1024];

		InputStream bis = null;

		BufferedOutputStream bos = null;

		File schemesDirFile = new File(c.getFilesDir().getAbsolutePath() + '/' + directory);

		schemesDirFile.mkdirs();

		String schemesDirPath = schemesDirFile.getAbsolutePath() + '/';

		//Get an array with the resource files ID

		TypedArray ta = c.getResources().obtainTypedArray(sourceResId);

		int[] resIds = new int[ta.length()];

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

			resIds[i] = ta.getResourceId(i, 0);

		}

		for(int id : resIds){

			String fileName = c.getResources().getResourceEntryName(id);

			File f = new File(schemesDirPath + fileName);

			try {

				if(!f.createNewFile()){

					f.delete();

					f.createNewFile();

				}

				bis = c.getResources().openRawResource(id);

				bos = new BufferedOutputStream(new FileOutputStream(f), 1024);

				int read = 0;

				while((read = bis.read(buffer)) != -1){

					bos.write(buffer, 0, read);

				}

			} catch (IOException e) {

				e.printStackTrace();

			}finally{

				if(bis != null)

					try { 

						bis.close();

					} catch (IOException e) {

						e.printStackTrace();

					}

				if(bos != null)

					try {

						bos.close();

					} catch (IOException e) {

						e.printStackTrace();

					}

			}

		}

	}

}