/**
 *   Copyright 2011 Guenther Hoelzl
 *
 *   This file is part of MINDdroid.
 *
 *   MINDdroid 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.
 *
 *   MINDdroid 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 MINDdroid.  If not, see <http://www.gnu.org/licenses/>.
**/

package com.lego.minddroid;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

/** 
 * This class is for uploading programs to the NXT brick via Bluetooth.
 * Special programs will be able to communicate with MINDdroid, so no PC
 * is required for playing with a robot.
 */
public class NXJUploader extends Activity implements UploadThreadListener, DialogListener, BTConnectable
{
    private static final int DIALOG_NXT = 0;
    private static final int DIALOG_FILE = 1;

    // preinstalled modules on res/raw/directoy
    private static String[] preinstalledNXJstring = new String[] 
        { "AlphaRex.nxj",
          "MINDGameZ.nxj"
        };

    private static final int REQUEST_CONNECT_DEVICE = 1000;
    private static final int REQUEST_ENABLE_BT = 2000;

    private BTCommunicator mNXT;
	private UploadThread uploadThread;
	private Handler handler;
    private ProgressDialog progressDialog;
    private int uploadStatus;
    private int runningDialog;
    private boolean pairing;
    private boolean btErrorPending = false;
    private static boolean btOnByUs = false;
        
    /** 
     * Called when the activity is first created. 
     */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.nxjuploader);
        initLayout();
        
        // Create objects for communication
        mNXT = new BTCommunicator(this, null, BluetoothAdapter.getDefaultAdapter(), getResources());
        handler = new Handler();   
        // Create and launch the upload thread
        uploadThread = new UploadThread(this, getResources());
        uploadThread.setBluetoothCommunicator(mNXT);
        uploadThread.start();
    }

    @Override
    protected void onStart() {
        super.onStart();

        if (!BluetoothAdapter.getDefaultAdapter().isEnabled()) {
            Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
        }
    }

    /** 
     * Called when the activity is destroyed. 
     */
    @Override
	protected void onDestroy() {
		super.onDestroy();
				
		// request the uploadthread to stop
		uploadThread.requestStop();	
    }

    /**
     * Asks if bluetooth was switched on during the runtime of the app. For saving 
     * battery we switch it off when the app is terminated.
     * @return true, when bluetooth was switched on by the app
     */
    public static boolean isBtOnByUs() {
        return btOnByUs;
    }

    /**
     * Sets a flag when bluetooth was switched on durin runtime
     * @param btOnByUs true, when bluetooth was switched on by the app
     */
    public static void setBtOnByUs(boolean btOnByUs) {
        NXJUploader.btOnByUs = btOnByUs;
    }

    /**
     * @return true, when currently pairing 
     */
    @Override
    public boolean isPairing() {
        return pairing;
    }

    /**
     * Displays a message as a toast
     */        
    public void showToast(String message) {
        Toast toast = Toast.makeText(this, message, Toast.LENGTH_SHORT);
        toast.show();
        return;
    }

    /**
     * Displays a message from resID as a toast
     */        
    public void showToast(int resID) {
        Toast toast = Toast.makeText(this, resID, Toast.LENGTH_SHORT);
        toast.show();
        return;
    }

    /**
     * Displays resp. updates a progress dialog
     */        
    public void showProgressDialog(String message, int maxProgress, int currentProgress) {
        boolean initialized = false;
        if (progressDialog == null) {
            initialized = true;
            progressDialog = new ProgressDialog(this);
            progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            progressDialog.setCancelable(false);
            progressDialog.setMessage(message);
        }
        progressDialog.setMax(maxProgress);
        progressDialog.setProgress(currentProgress);
        if (initialized) 
            progressDialog.show();
    }

    /**
     * Displays resp. updates a progress dialog
     */        
    public void showProgressDialog(String message) {
        if (progressDialog == null) {
            progressDialog = new ProgressDialog(this);
            progressDialog.setCancelable(false);
            progressDialog.setMessage(message);
            progressDialog.show();
        }
    }

    /**
     * Dismisses an existing progress dialog
     */        
    public void dismissProgressDialog() {
        if (progressDialog != null) {
            progressDialog.dismiss();
            progressDialog = null;
        }
    }
            
    /**
     * Initializes the values on the main screen
     */    
    private void initLayout() {
        initNXTButton();
        initFileButton();
        initUploadButton();
    }

    /**
     * Initializes the "SELECT NXT" button
     */        
    private void initNXTButton() {
        Button fileButton = (Button) findViewById(R.id.nxt_button);
        fileButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                selectNXT();
            }
        }); 
    }

    /**
     * Initializes the "SELECT FILE" button
     */        
    private void initFileButton() {
        Button fileButton = (Button) findViewById(R.id.file_button);
        fileButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                showFileDialog();
            }
        }); 
    }

    /**
     * Starts the NXT selection activity
     */            
    private void selectNXT() {
        Intent serverIntent = new Intent(this, DeviceListActivity.class);
        startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE);
    }

    /**
     * Shows the file dialog
     */            
    private void showFileDialog() {
        NXJFileDialog fileDialog = new NXJFileDialog(this, this);
        if (fileDialog.refreshFileList(preinstalledNXJstring) == 0) 
            showToast(R.string.nxj_no_files);
        else {
            runningDialog = DIALOG_FILE;
            fileDialog.show();
        }
    }

    /* 
     * This is the method for returning values of dialogs
     * @param the selected text
     */
    @Override
    public void dialogUpdate(String text) {
        TextView textView;
        switch (runningDialog) {
            case DIALOG_NXT:
                textView = (TextView) findViewById(R.id.nxt_name);
                textView.setText(text);
                break;

            case DIALOG_FILE:
                textView = (TextView) findViewById(R.id.nxj_file_name);
                textView.setText(text);
                break;
        }
    }

    /**
     * Initializes the "UPLOAD" button
     */        
    private void initUploadButton() {
        Button uploadButton = (Button) findViewById(R.id.upload_button);
        uploadButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {                
                TextView nxtTextView = (TextView) findViewById(R.id.nxt_name);
                String macAddress = nxtTextView.getText().toString();
                if (macAddress.compareTo("") == 0) {
                    showToast(R.string.nxj_please_select_nxt);
                    return;
                }
                macAddress = macAddress.substring(macAddress.lastIndexOf('-')+1);
                TextView nxjTextView = (TextView) findViewById(R.id.nxj_file_name);
                String fileName = nxjTextView.getText().toString();
                if (fileName.compareTo("") == 0) {
                    showToast(R.string.nxj_please_select_file);
                    return;
                }
                uploadThread.enqueueUpload(macAddress, fileName); 
            }
        }); 
    }

    /**
     * This will be called by the UploadThread to signal an update of the 
     * current status. 
     * @param status The current state of the UploadThread
     */        
	@Override
	public void handleUploadThreadUpdate(final int status) {
		handler.post(new Runnable() {
			@Override
			public void run() {
                if (status != uploadStatus) {
                    dismissProgressDialog();
                    uploadStatus = status;
                }
                showUploadStatus();
			}
		});
	}

    /**
     * Shows the current status of the uploader either in 
     * a progress bar or in toast in case of an error.
     */        
    private void showUploadStatus() {

        switch (uploadStatus) {
            case UploadThread.CONNECTING:
                showProgressDialog(getResources().getString(R.string.nxj_connecting));
                break;
            case UploadThread.UPLOADING:
                showProgressDialog(getResources().getString(R.string.nxj_uploading), 
                    uploadThread.getFileLength(), 
                    uploadThread.getBytesUploaded());
                break;
            default:
                dismissProgressDialog();
        }

        switch (uploadThread.getErrorCode()) {
            case UploadThread.NO_ERROR:
                break;
            case UploadThread.OPEN_BT_ERROR:
                if (pairing)
                    showToast(R.string.nxj_bluetooth_pairing);
                else
                    showBTErrorDialog();
                break;
            case UploadThread.CLOSE_BT_ERROR:
                showBTErrorDialog();
                break;
            case UploadThread.OPEN_FILE_ERROR:
                showToast(R.string.nxj_file_open_error);
                break;
            case UploadThread.UPLOAD_ERROR:
                showBTErrorDialog();
                break;
            default:
                showToast(R.string.nxj_other_error);
        }
        uploadThread.resetErrorCode();
    }

    /**
     * Shows an error dialog when there's an error regarding
     * bluettooth transfer.
     */        
    private void showBTErrorDialog() {
        if (btErrorPending == false) {
            btErrorPending = true;
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle(getResources().getString(R.string.bt_error_dialog_title))
            .setMessage(getResources().getString(R.string.bt_error_dialog_message)).setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    btErrorPending = false;
                    dialog.cancel();
                }
            });
            builder.create().show();
        }
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case REQUEST_CONNECT_DEVICE:
                // When DeviceListActivity returns with a device to connect
                if (resultCode == Activity.RESULT_OK) {
                    // Get the device infos
                    String infos = data.getExtras().getString(DeviceListActivity.DEVICE_NAME_AND_ADDRESS);
                    pairing = data.getExtras().getBoolean(DeviceListActivity.PAIRING);
                    TextView textView = (TextView) findViewById(R.id.nxt_name);
                    textView.setText(infos);
                }
                break;

            case REQUEST_ENABLE_BT:
                // When the request to enable Bluetooth returns
                switch (resultCode) {
                    case Activity.RESULT_OK:
                        btOnByUs = true;
                        break;
                    case Activity.RESULT_CANCELED:
                        showToast(R.string.bt_needs_to_be_enabled);
                        finish();
                        break;
                }
                break;
        }                
    }

}