/*
 * WineActivity class
 *
 * Copyright 2013-2017 Alexandre Julliard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

package org.winehq.wine;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.SharedPreferences;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class WineActivity extends Activity
{
    private final String LOGTAG = "wine";
    private ProgressDialog progress_dialog;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate( savedInstanceState );

        requestWindowFeature( android.view.Window.FEATURE_NO_TITLE );

        new Thread( new Runnable() { public void run() { loadWine(); }} ).start();
    }

    private void loadWine()
    {
        copyAssetFiles();
        runOnUiThread( new Runnable() { public void run() { progress_dialog.dismiss(); }});
    }

    private void createProgressDialog( final int max, final String message )
    {
        runOnUiThread( new Runnable() { public void run() {
            if (progress_dialog != null) progress_dialog.dismiss();
            progress_dialog = new ProgressDialog( WineActivity.this );
            progress_dialog.setProgressStyle( max > 0 ? ProgressDialog.STYLE_HORIZONTAL
                                              : ProgressDialog.STYLE_SPINNER );
            progress_dialog.setTitle( "Wine" );
            progress_dialog.setMessage( message );
            progress_dialog.setCancelable( false );
            progress_dialog.setMax( max );
            progress_dialog.show();
        }});

    }

    private final boolean isFileWanted( String name )
    {
        if (name.equals( "files.sum" )) return true;
        if (name.startsWith( "share/" )) return true;
        if (name.startsWith( Build.CPU_ABI + "/system/" )) return false;
        if (name.startsWith( Build.CPU_ABI + "/" )) return true;
        if (name.startsWith( "x86/" )) return true;
        return false;
    }

    private final boolean isFileExecutable( String name )
    {
        return name.startsWith( Build.CPU_ABI + "/" ) || name.startsWith( "x86/" );
    }

    private final HashMap<String,String> readMapFromInputStream( InputStream in )
    {
        HashMap<String,String> map = new HashMap<String,String>();
        String str;

        try
        {
            BufferedReader reader = new BufferedReader( new InputStreamReader( in, "UTF-8" ));
            while ((str = reader.readLine()) != null)
            {
                String entry[] = str.split( "\\s+", 2 );
                if (entry.length == 2 && isFileWanted( entry[1] )) map.put( entry[1], entry[0] );
            }
        }
        catch( IOException e ) { }
        return map;
    }

    private final HashMap<String,String> readMapFromDiskFile( String file )
    {
        try
        {
            return readMapFromInputStream( new FileInputStream( new File( getFilesDir(), file )));
        }
        catch( IOException e ) { return new HashMap<String,String>(); }
    }

    private final HashMap<String,String> readMapFromAssetFile( String file )
    {
        try
        {
            return readMapFromInputStream( getAssets().open( file ) );
        }
        catch( IOException e ) { return new HashMap<String,String>(); }
    }

    private final void copyAssetFile( String src )
    {
        File dest = new File( getFilesDir(), src );
        try
        {
            Log.i( LOGTAG, "extracting " + dest );
            dest.getParentFile().mkdirs();
            dest.delete();
            if (dest.createNewFile())
            {
                InputStream in = getAssets().open( src );
                FileOutputStream out = new FileOutputStream( dest );
                int read;
                byte[] buffer = new byte[65536];

                while ((read = in.read( buffer )) > 0) out.write( buffer, 0, read );
                out.close();
                if (isFileExecutable( src )) dest.setExecutable( true, true );
            }
            else
                Log.i( LOGTAG, "Failed to create file "  + dest );
        }
        catch( IOException e )
        {
            Log.i( LOGTAG, "Failed to copy asset file to " + dest );
            dest.delete();
        }
    }

    private final void deleteAssetFile( String src )
    {
        File dest = new File( getFilesDir(), src );
        Log.i( LOGTAG, "deleting " + dest );
        dest.delete();
    }

    private final void copyAssetFiles()
    {
        String new_sum = readMapFromAssetFile( "sums.sum" ).get( "files.sum" );
        if (new_sum == null) return;  // no assets

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences( this );
        String old_sum = prefs.getString( "files.sum", "" );
        if (old_sum.equals( new_sum )) return;  // no change
        prefs.edit().putString( "files.sum", new_sum ).apply();

        HashMap<String,String> existing_files = readMapFromDiskFile( "files.sum" );
        HashMap<String,String> new_files = readMapFromAssetFile( "files.sum" );
        ArrayList<String> copy_files = new ArrayList<String>();
        copy_files.add( "files.sum" );

        for (Map.Entry<String, String> entry : new_files.entrySet())
        {
            String name = entry.getKey();
            if (!entry.getValue().equals( existing_files.remove( name ))) copy_files.add( name );
        }

        createProgressDialog( copy_files.size(), "Extracting files..." );

        for (String name : existing_files.keySet()) deleteAssetFile( name );

        for (String name : copy_files)
        {
            copyAssetFile( name );
            runOnUiThread( new Runnable() { public void run() {
                progress_dialog.incrementProgressBy( 1 ); }});
        }
    }
}