/android/import-contacts

/*

 * ImportContacts.java

 *

 * Copyright (C) 2009 Tim Marston <edam@waxworlds.org>

 *

 * This file is part of the Import Contacts program (hereafter referred

 * to as "this program"). For more information, see

 * http://www.waxworlds.org/edam/software/android/import-contacts

 *

 * 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, either version 3 of the License, or

 * (at your option) any later version.

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */

package org.waxworlds.importcontacts;

import java.util.Stack;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

public class ImportContacts extends Activity

{

	public static final int STATE_NONE = 0;

	public static final int STATE_INTRO = 1;

	public static final int STATE_CONFIGURE_VCF = 3;

	public static final int STATE_MERGE = 4;

	public static final int STATE_DOIT = 5;

	private Stack< Integer > _stateStack;

	/** Called when the activity is first created. */

	@Override

	public void onCreate( Bundle savedInstanceState )

	{

		super.onCreate(savedInstanceState);

		_stateStack = new Stack< Integer >();

		if( savedInstanceState == null )

		{

			startState( STATE_INTRO );

		}

		else

		{

			int[] stack = savedInstanceState.getIntArray( "_stateStack" );

			for( int n = 0; n < stack.length; n++ )

				_stateStack.push( stack[ n ] );

			int lastState = _stateStack.pop();

			startState( lastState );

		}

	}

	@Override

	protected void onSaveInstanceState(Bundle outState) {

		super.onSaveInstanceState(outState);

		int[] stack = new int[ _stateStack.size() ];

		for( int n = 0; n < _stateStack.size(); n++ )

			stack[ n ] = _stateStack.elementAt( n );

		outState.putIntArray( "_stateStack", stack );

	}

	@Override

	protected void onActivityResult(int requestCode, int resultCode, Intent data)

	{

		super.onActivityResult(requestCode, resultCode, data);

		// quit?

		if( resultCode == RESULT_CANCELED ) {

			finish();

		}

		else {

			int newState = STATE_NONE;

			if( data != null ) {

				Bundle extras = data.getExtras();

				if( extras != null ) {

					Integer tmp = extras.getInt( "nextstate" );

					if( tmp != null ) {

						newState = tmp.intValue();

					}

				}

			}

			startState( newState );

		}

	}

	private void startState( int newState )

	{

		if( newState == STATE_NONE )

		{

			// we're going back, so pop top state off stack

			_stateStack.pop();

			newState = ( (Integer)_stateStack.peek() ).intValue();

		}

		else

		{

			// push new state on state

			_stateStack.push( new Integer( newState ) );

		}

		// figure out the class

		Class cls = null;

		switch( newState ) {

		case STATE_INTRO: cls = Intro.class; break;

		case STATE_CONFIGURE_VCF: cls = ConfigureVCF.class; break;

		case STATE_MERGE: cls = Merge.class; break;

		case STATE_DOIT: cls = Doit.class; break;

		}

		// start activity

		Intent i = new Intent( this, cls );

		if( _stateStack.size() > 1 ) i.putExtra( "backstate", true );

		startActivityForResult( i, 0 );

	}

}