/* ownCloud Android client application
 *   Copyright (C) 2011 Bartek Przybylski
 *
 *   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 eu.alefzero.owncloud.ui.activity;

import com.actionbarsherlock.app.SherlockFragmentActivity;

import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.Toast;
import eu.alefzero.owncloud.R;
import eu.alefzero.owncloud.authenticator.AccountAuthenticator;
import eu.alefzero.owncloud.ui.adapter.LandingScreenAdapter;

/**
 * This activity is used as a landing page when the user first opens this app.
 * @author Lennart Rosam
 * 
 */
public class LandingActivity extends SherlockFragmentActivity implements OnClickListener, OnItemClickListener {

	public static final int DIALOG_SETUP_ACCOUNT = 1;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		
		// Fill the grid view that is only available in portrait mode
		GridView landingScreenItems = (GridView) findViewById(R.id.homeScreenGrid);
		if(landingScreenItems != null){
			landingScreenItems.setAdapter(new LandingScreenAdapter(this));
			landingScreenItems.setOnItemClickListener(this);
		}
		
		// Check, if there are ownCloud accounts
		if(!accountsAreSetup()){
			showDialog(DIALOG_SETUP_ACCOUNT);
		}

	}
	
	@Override
	protected void onRestart() {
		super.onRestart();
		// Check, if there are ownCloud accounts
		if(!accountsAreSetup()){
			showDialog(DIALOG_SETUP_ACCOUNT);
		}
	}

	@Override
	protected void onRestoreInstanceState(Bundle savedInstanceState) {
		super.onRestoreInstanceState(savedInstanceState);
		// Check, if there are ownCloud accounts
		if(!accountsAreSetup()){
			showDialog(DIALOG_SETUP_ACCOUNT);
		}
	}

	@Override
	protected Dialog onCreateDialog(int id) {
		Dialog dialog;
		switch(id){
		case DIALOG_SETUP_ACCOUNT:
			AlertDialog.Builder builder = new AlertDialog.Builder(this);
			builder.setTitle(R.string.main_tit_accsetup);
			builder.setMessage(R.string.main_wrn_accsetup);
			builder.setCancelable(false);
			builder.setPositiveButton(R.string.common_ok, this);
			builder.setNegativeButton(R.string.common_cancel, this);
			dialog = builder.create();
			break;
		default: 
			dialog = null;
		}
			
		return dialog;
	}

	public void onClick(DialogInterface dialog, int which) {
		// In any case - we won't need it anymore
		dialog.dismiss();
		switch(which){
		case DialogInterface.BUTTON_POSITIVE:
			Intent intent = new Intent("android.settings.ADD_ACCOUNT_SETTINGS");
			intent.putExtra("authorities",
					new String[] { AccountAuthenticator.AUTH_TOKEN_TYPE });
			startActivity(intent);
			break;
		case DialogInterface.BUTTON_NEGATIVE:
			finish();
		}
		
	}
	
	@Override
	/**
	 * Start an activity based on the selection
	 * the user made
	 */
	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
		Intent intent;
		intent = (Intent) parent.getAdapter().getItem(position);
		if(intent != null ){
			startActivity(intent);
		} else {
			Toast toast = Toast.makeText(this, "Not yet implemented!", Toast.LENGTH_SHORT);
			toast.show();
		} 
	}
	
	/**
	 * Checks, whether or not there are any ownCloud accounts 
	 * setup. 
	 *  
	 * @return true, if there is at least one account.
	 */
	private boolean accountsAreSetup() {
		AccountManager accMan = AccountManager.get(this);
		Account[] accounts = accMan
				.getAccountsByType(AccountAuthenticator.ACCOUNT_TYPE); 
		return accounts.length > 0;
	}

	
}