package se.leap.leapclient;

import org.apache.http.cookie.Cookie;
import org.apache.http.impl.cookie.BasicClientCookie;
import org.json.JSONException;
import org.json.JSONObject;

import se.leap.leapclient.ProviderAPIResultReceiver.Receiver;
import se.leap.openvpn.AboutFragment;
import se.leap.openvpn.LogWindow;
import se.leap.openvpn.MainActivity;
import se.leap.openvpn.OpenVPN;
import se.leap.openvpn.OpenVPN.StateListener;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.DialogFragment;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.os.ResultReceiver;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewStub;
import android.widget.CompoundButton;
import android.widget.RelativeLayout;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.Toast;

/**
 * The main user facing Activity of LEAP Android, consisting of status, controls,
 * and access to preferences.
 * 
 * @author Sean Leonard <meanderingcode@aetherislands.net>
 */
public class Dashboard extends Activity implements LogInDialog.LogInDialogInterface,Receiver,StateListener {

	protected static final int CONFIGURE_LEAP = 0;
	
	private static Context app;
	private static SharedPreferences preferences;
	private static Provider provider;

	private TextView providerNameTV;
	private TextView eipTypeTV;
	private Switch eipSwitch;
	private View eipDetail;
	private TextView eipStatus;
	
	private boolean mEipWait = false;

    public ProviderAPIResultReceiver providerAPI_result_receiver;
    private EIPReceiver mEIPReceiver;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		app = this;
		
		setContentView(R.layout.client_dashboard);

		ConfigHelper.setSharedPreferences(getSharedPreferences(ConfigHelper.PREFERENCES_KEY, MODE_PRIVATE));
		if(ConfigHelper.shared_preferences == null)
			ConfigHelper.setSharedPreferences(preferences);
		
		if (ConfigHelper.getStringFromSharedPref(ConfigHelper.PROVIDER_KEY).isEmpty())
			startActivityForResult(new Intent(this,ConfigurationWizard.class),CONFIGURE_LEAP);
		else
			buildDashboard();
	}

	@Override
	protected void onStop() {
		super.onStop();
		if (provider != null)
			if (provider.hasEIP() && provider.getEIPType() == "OpenVPN")
				OpenVPN.removeStateListener(this);
	}
	
	@Override
	protected void onResume() {
		super.onResume();
		
		if (provider != null)
			if (provider.hasEIP() && provider.getEIPType() == "OpenVPN")
				OpenVPN.addStateListener(this);
	}
	
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data){
		if ( requestCode == CONFIGURE_LEAP ) {
			if ( resultCode == RESULT_OK ){
				buildDashboard();
				if(data != null && data.hasExtra(ConfigHelper.LOG_IN)) {
					View view = ((ViewGroup)findViewById(android.R.id.content)).getChildAt(0);
					logInDialog(view);
				}
			} else
				configErrorDialog();
		}
	}
	
	/**
	 * Dialog shown when encountering a configuration error.  Such errors require
	 * reconfiguring LEAP or aborting the application.
	 */
	private void configErrorDialog() {
		AlertDialog.Builder alertBuilder = new AlertDialog.Builder(getAppContext());
		alertBuilder.setTitle(getResources().getString(R.string.setup_error_title));
		alertBuilder
			.setMessage(getResources().getString(R.string.setup_error_text))
			.setCancelable(false)
			.setPositiveButton(getResources().getString(R.string.setup_error_configure_button), new DialogInterface.OnClickListener() {
				@Override
				public void onClick(DialogInterface dialog, int which) {
					startActivityForResult(new Intent(getAppContext(),ConfigurationWizard.class),CONFIGURE_LEAP);
				}
			})
			.setNegativeButton(getResources().getString(R.string.setup_error_close_button), new DialogInterface.OnClickListener() {
				@Override
				public void onClick(DialogInterface dialog, int which) {
					SharedPreferences.Editor prefsEdit = getSharedPreferences(ConfigHelper.PREFERENCES_KEY, MODE_PRIVATE).edit();
					prefsEdit.remove(ConfigHelper.PROVIDER_KEY).commit();
					finish();
				}
			});
	}
	
	/**
	 * Inflates permanent UI elements of the View and contains logic for what
	 * service dependent UI elements to include.
	 */
	private void buildDashboard() {
		provider = Provider.getInstance();
		provider.init( this );

		providerNameTV = (TextView) findViewById(R.id.providerName);
		providerNameTV.setText(provider.getName());
		providerNameTV.setTextSize(28);

		if ( provider.hasEIP() ){
			startService( new Intent(EIP.ACTION_UPDATE_EIP_SERVICE) );
			if (provider.getEIPType() == "OpenVPN")
				OpenVPN.addStateListener(this);
			serviceItemEIP();
		}
	}

	/**
	 * Builds the UI for the EIP service Dashboard component
	 */
	private void serviceItemEIP() {
		mEIPReceiver = new EIPReceiver(new Handler());
		mEIPReceiver.setReceiver(this);

		Intent intent = new Intent(this,EIP.class);
		intent.setAction(EIP.ACTION_IS_EIP_RUNNING);
		intent.putExtra(ConfigHelper.RECEIVER_TAG, mEIPReceiver);
		startService(intent);
		
		((ViewStub) findViewById(R.id.eipOverviewStub)).inflate();

		eipTypeTV = (TextView) findViewById(R.id.eipType);
		eipTypeTV.setText(provider.getEIPType());
		
		eipDetail = ((RelativeLayout) findViewById(R.id.eipDetail));
		View eipSettings = findViewById(R.id.eipSettings);
		eipSettings.setVisibility(View.GONE); // FIXME too!
		eipDetail.setVisibility(View.VISIBLE);
		eipStatus = (TextView) findViewById(R.id.eipStatus);

		eipSwitch = (Switch) findViewById(R.id.eipSwitch);
		eipSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
			@Override
			public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
				if (!mEipWait){
					buttonView.setClickable(false);
					mEipWait = true;
					
					Intent vpnIntent;
					if (isChecked){
						vpnIntent = new Intent(EIP.ACTION_START_EIP);
					} else {
						vpnIntent = new Intent(EIP.ACTION_STOP_EIP);
					}
					vpnIntent.putExtra(ConfigHelper.RECEIVER_TAG, mEIPReceiver);
					startService(vpnIntent);
				}
			}
		});
	}
	
	/**
	 * Expands the EIP Dashboard component for extra details view.
	 * Called by onClick property in client_dashboard.xml layout.
	 * 
	 * @param view (Unused) The View calling this method by its onClick property
	 */
	public void toggleEipOverview(View view) {
		if (eipDetail.isShown())
			eipDetail.setVisibility(View.GONE);
		else
			eipDetail.setVisibility(View.VISIBLE);
	}
	
	/**
	 * Launches the se.leap.openvpn.LogWindow Activity showing detailed OpenVPN log
	 * 
	 * @param view (Unused) The View calling this method by its onClick property
	 */
	public void showEIPLog(View view){
		Intent intent = new Intent(getBaseContext(),LogWindow.class);
		intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
		startActivity(intent);
	}

	@Override
	public boolean onPrepareOptionsMenu(Menu menu) {
		JSONObject provider_json;
		try {
			provider_json = ConfigHelper.getJsonFromSharedPref(ConfigHelper.PROVIDER_KEY);
			JSONObject service_description = provider_json.getJSONObject(ConfigHelper.SERVICE_KEY);
			if(service_description.getBoolean(ConfigHelper.ALLOW_REGISTRATION_KEY)) {
				menu.findItem(R.id.login_button).setVisible(true);
				menu.findItem(R.id.logout_button).setVisible(true);
			}
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
		return true;
	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.client_dashboard, menu);
		return true;
	}
	
	@Override
	public boolean onOptionsItemSelected(MenuItem item){
		Intent intent;
		switch (item.getItemId()){
		case R.id.about_leap:
			Fragment aboutFragment = new AboutFragment();
			FragmentTransaction trans = getFragmentManager().beginTransaction();
			trans.replace(R.id.dashboardLayout, aboutFragment);
			trans.addToBackStack(null);
			trans.commit();
			return true;
		case R.id.legacy_interface:
			intent = new Intent(this,MainActivity.class);
			startActivity(intent);
			return true;
		case R.id.login_button:
			View view = ((ViewGroup)findViewById(android.R.id.content)).getChildAt(0);
			logInDialog(view);
			return true;
		case R.id.logout_button:
			logOut();
			return true;
		default:
				return super.onOptionsItemSelected(item);
		}
		
	}

	@Override
	public void authenticate(String username, String password) {
		providerAPI_result_receiver = new ProviderAPIResultReceiver(new Handler());
		providerAPI_result_receiver.setReceiver(this);
		
		Intent provider_API_command = new Intent(this, ProviderAPI.class);

		Bundle method_and_parameters = new Bundle();
		method_and_parameters.putString(ConfigHelper.USERNAME_KEY, username);
		method_and_parameters.putString(ConfigHelper.PASSWORD_KEY, password);

		JSONObject provider_json;
		try {
			provider_json = new JSONObject(preferences.getString(ConfigHelper.PROVIDER_KEY, ""));
			method_and_parameters.putString(ConfigHelper.API_URL_KEY, provider_json.getString(ConfigHelper.API_URL_KEY) + "/" + provider_json.getString(ConfigHelper.API_VERSION_KEY));
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		provider_API_command.putExtra(ConfigHelper.SRP_AUTH, method_and_parameters);
		provider_API_command.putExtra(ConfigHelper.RECEIVER_KEY, providerAPI_result_receiver);
		
		startService(provider_API_command);
	}
	
	/**
	 * Asks ProviderAPI to log out.
	 */
	public void logOut() {
		providerAPI_result_receiver = new ProviderAPIResultReceiver(new Handler());
		providerAPI_result_receiver.setReceiver(this);
		Intent provider_API_command = new Intent(this, ProviderAPI.class);

		Bundle method_and_parameters = new Bundle();

		JSONObject provider_json;
		try {
			provider_json = new JSONObject(preferences.getString(ConfigHelper.PROVIDER_KEY, ""));
			method_and_parameters.putString(ConfigHelper.API_URL_KEY, provider_json.getString(ConfigHelper.API_URL_KEY) + "/" + provider_json.getString(ConfigHelper.API_VERSION_KEY));
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		provider_API_command.putExtra(ConfigHelper.LOG_OUT, method_and_parameters);
		provider_API_command.putExtra(ConfigHelper.RECEIVER_KEY, providerAPI_result_receiver);
		
		startService(provider_API_command);
	}
	
	/**
	 * Shows the log in dialog.
	 * @param view from which the dialog is created.
	 */
	public void logInDialog(View view) {
		FragmentTransaction fragment_transaction = getFragmentManager().beginTransaction();
	    Fragment previous_log_in_dialog = getFragmentManager().findFragmentByTag(ConfigHelper.LOG_IN_DIALOG);
	    if (previous_log_in_dialog != null) {
	        fragment_transaction.remove(previous_log_in_dialog);
	    }
	    fragment_transaction.addToBackStack(null);

	    DialogFragment newFragment = LogInDialog.newInstance();
	    newFragment.show(fragment_transaction, ConfigHelper.LOG_IN_DIALOG);
	}

	/**
	 * Asks ProviderAPI to download an authenticated OpenVPN certificate.
	 * @param session_id cookie for the server to allow us to download the certificate.
	 */
	private void downloadAuthedUserCertificate(Cookie session_id) {
		providerAPI_result_receiver = new ProviderAPIResultReceiver(new Handler());
		providerAPI_result_receiver.setReceiver(this);
		
		Intent provider_API_command = new Intent(this, ProviderAPI.class);

		Bundle method_and_parameters = new Bundle();
		method_and_parameters.putString(ConfigHelper.TYPE_OF_CERTIFICATE, ConfigHelper.AUTHED_CERTIFICATE);
		method_and_parameters.putString(ConfigHelper.SESSION_ID_COOKIE_KEY, session_id.getName());
		method_and_parameters.putString(ConfigHelper.SESSION_ID_KEY, session_id.getValue());

		provider_API_command.putExtra(ConfigHelper.DOWNLOAD_CERTIFICATE, method_and_parameters);
		provider_API_command.putExtra(ConfigHelper.RECEIVER_KEY, providerAPI_result_receiver);
		
		startService(provider_API_command);
	}

	@Override
	public void onReceiveResult(int resultCode, Bundle resultData) {
		if(resultCode == ConfigHelper.SRP_AUTHENTICATION_SUCCESSFUL){
			String session_id_cookie_key = resultData.getString(ConfigHelper.SESSION_ID_COOKIE_KEY);
			String session_id_string = resultData.getString(ConfigHelper.SESSION_ID_KEY);
			setResult(RESULT_OK);
			Toast.makeText(getApplicationContext(), R.string.succesful_authentication_message, Toast.LENGTH_LONG).show();

			Cookie session_id = new BasicClientCookie(session_id_cookie_key, session_id_string);
			downloadAuthedUserCertificate(session_id);
		} else if(resultCode == ConfigHelper.SRP_AUTHENTICATION_FAILED) {
        	setResult(RESULT_CANCELED);
			Toast.makeText(getApplicationContext(), R.string.authentication_failed_message, Toast.LENGTH_LONG).show();
		} else if(resultCode == ConfigHelper.LOGOUT_SUCCESSFUL) {
			setResult(RESULT_OK);
			Toast.makeText(getApplicationContext(), R.string.successful_log_out_message, Toast.LENGTH_LONG).show();
		} else if(resultCode == ConfigHelper.LOGOUT_FAILED) {
			setResult(RESULT_CANCELED);
			Toast.makeText(getApplicationContext(), R.string.log_out_failed_message, Toast.LENGTH_LONG).show();
		} else if(resultCode == ConfigHelper.CORRECTLY_DOWNLOADED_CERTIFICATE) {
        	setResult(RESULT_CANCELED);
			Toast.makeText(getApplicationContext(), R.string.successful_authed_cert_downloaded_message, Toast.LENGTH_LONG).show();
		} else if(resultCode == ConfigHelper.INCORRECTLY_DOWNLOADED_CERTIFICATE) {
        	setResult(RESULT_CANCELED);
			Toast.makeText(getApplicationContext(), R.string.authed_cert_download_failed_message, Toast.LENGTH_LONG).show();
		}
	}

	/**
	 * For retrieving the base application Context in classes that don't extend
	 * Android's Activity class
	 * 
	 * @return Application Context as defined by <code>this</code> for Dashboard instance
	 */
	public static Context getAppContext() {
		return app;
	}
	
	@Override
	public void updateState(final String state, final String logmessage, final int localizedResId) {
		// Note: "states" are not organized anywhere...collected state strings:
		//		NOPROCESS,NONETWORK,BYTECOUNT,AUTH_FAILED + some parsing thing ( WAIT(?),AUTH,GET_CONFIG,ASSIGN_IP,CONNECTED(?) )
		runOnUiThread(new Runnable() {

			@Override
			public void run() {
				if (eipStatus != null) {
					String prefix = getString(localizedResId) + ":";
					if (state.equals("BYTECOUNT") || state.equals("NOPROCESS"))
						prefix = "";
					eipStatus.setText(prefix + logmessage);
				}
			}
		});
	}

	/**
	 * Inner class for handling messages related to EIP status and control requests
	 * 
	 * @author Sean Leonard <meanderingcode@aetherislands.net>
	 */
	protected class EIPReceiver extends ResultReceiver {
		
		Dashboard mDashboard;
		
		protected EIPReceiver(Handler handler){
			super(handler);
		}
		
		public void setReceiver(Dashboard receiver) {
			mDashboard = receiver;
		}

		@Override
		protected void onReceiveResult(int resultCode, Bundle resultData) {
			super.onReceiveResult(resultCode, resultData);
			
			String request = resultData.getString(ConfigHelper.REQUEST_TAG);
			mEipWait = true;
			boolean checked = false;
			
			if (request == EIP.ACTION_IS_EIP_RUNNING) {
				switch (resultCode){
				case RESULT_OK:
					checked = true;
					break;
				case RESULT_CANCELED:
					checked = false;
					break;
				}
			} else if (request == EIP.ACTION_START_EIP) {
				switch (resultCode){
				case RESULT_OK:
					checked = true;
					break;
				case RESULT_CANCELED:
					checked = false;
					break;
				}
			} else if (request == EIP.ACTION_STOP_EIP) {
				switch (resultCode){
				case RESULT_OK:
					checked = false;
					break;
				case RESULT_CANCELED:
					checked = true;
					break;
				}
			} else if (request == EIP.EIP_NOTIFICATION) {
				switch  (resultCode){
				case RESULT_OK:
					checked = true;
					break;
				case RESULT_CANCELED:
					checked = false;
					break;
				}
			}
			
			Switch eipS = ((Switch) mDashboard.findViewById(R.id.eipSwitch));
			eipS.setChecked(checked);
			eipS.setClickable(true);
			mEipWait = false;
		}
	}
}