/**
* @author Twenty Codes
* @author ricky barrette
*/

package com.TwentyCodes.android.DroidFinderFull;

import java.util.InputMismatchException;
import java.util.Scanner;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.telephony.gsm.SmsManager;
import android.telephony.gsm.SmsMessage;
import android.util.Log;

/**
 * this class will handle all receiving and sending of SMS messages
 * @author ricky barrette
 */
public class SMS extends BroadcastReceiver{
	
	protected static final String DELETE_CONFIRMATION = "delete_comfirmation";
	protected static final String RETURN_ADDRESS = "return_address";
	protected static final String NUMBERS = "numbers";
	protected static final String LAT = "lat";
	protected static final String LON = "lon";
	protected static final String ACCURACY = "accuracy";	
	
	private SharedPreferences numbers;
	private SharedPreferences settings;
	private String tag = "SmsReceiver";

	/**
	 * checks the md5 hash code of a string msg to the saved md5 hash code of a password
	 * @param msg
	 * @param key
	 * @return true if the md5 hash code matches the saved md5 hash code saved in the passwords.xml
	 * @author ricky barrette
	 */
//	private boolean checkmd5sum(String msg, String key){
//	    String correctMd5 = passwords.getString(key,null);
//	    if (correctMd5 != null) {
//    		String md5hash = DroidFinder.getMd5Hash(msg);
//    		if (md5hash.equals(correctMd5)) {
//    			return true;                                            
//            }
//	    }
//	    return false;
//	}  

	@Override
	public void onReceive(Context context, Intent intent) {
		Log.i(tag,"onRecive()");
		
		settings = context.getSharedPreferences(SettingsActivity.SETTINGS, 0);
		numbers = context.getSharedPreferences(NUMBERS, 0);
		
		//get the SMS message
        Bundle bundle = intent.getExtras();        
        
        if (bundle != null)
        {
        	SmsMessage[] msgs = null;
            StringBuilder smsMsg = new StringBuilder();
            StringBuilder phoneNumber = new StringBuilder();
            
            //read the SMS message received
            Object[] pdus = (Object[]) bundle.get("pdus");
            msgs = new SmsMessage[pdus.length];
            for (int i=0; i<msgs.length; i++){
                msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);                
                smsMsg.append(msgs[i].getMessageBody().toString()); 
                phoneNumber.append(msgs[i].getOriginatingAddress());
            }
            
            String msg = smsMsg.toString();
            
            /*
             * locate
             * if the SMS message matches a specified string (ignoring case)
             * then do something
             */
            if (msg.equalsIgnoreCase(settings.getString(SettingsActivity.LOCATE_PASS, null)) && 
            		settings.getBoolean(SettingsActivity.LOCATE_ENABLED, false)){
            	
            	if (phoneNumber.toString().length() > 0 && storeNumber(phoneNumber.toString())){
            		Log.i(tag, "saved number successfuly!");
            		
            		Log.i(tag,"sending phone location to sender");
            		
            		LocationManager lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
                	Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                	String number = numbers.getString(RETURN_ADDRESS, null);
                	if (number != null){
                		sendSMS(number,
                			"DroidFinder: " +
    	    				location.getLatitude() + ", " + location.getLongitude()
    	    				+ "\n Accuracy (meters)= " + location.getAccuracy());
//    	    				+ "\n Speed (meters/second) = "
//    	    				+ location.getSpeed());
                	}
            		
            	} else {
            		Log.w(tag, "did not save number successfuly");
            	}
            }
        	
        	/*
        	 * if the sms msg contains the char sequence "DroidFinder: " then save the 3 floats
        	 * for lat, lon, and accuracy.
        	 */
        	if (msg.startsWith("DroidFinder")){
        		Log.i(tag,"recived a droidfinder message");
        		Scanner scan = new Scanner(msg);
        		int index = 0;
        		Editor editor = settings.edit();
        		
        		/*
        		 * loops though a human readable message than contains a lat, lon, and accuracy in a specific order.
        		 * 
        		 * while the is a other token in the string, try to save it as lat, lon, or accuracy (based on what has been already saved)
        		 * if we cant save due to an InputMismatchException, then log it and skip over the token.
        		 */
        		do { 
        			try {
	        			switch (index){
	        				case 0:
								Log.i(tag,"tring to save token as lat");
								editor.putInt(LAT, (int) (scan.nextDouble() * 1e6));
								index++;
								Log.i(tag,"save success");
	        					break;
	        				case 1:
								Log.i(tag,"tring to save token as lon");
								editor.putInt(LON, (int) (scan.nextDouble() * 1e6));
								index++;
								Log.i(tag,"save success");
	        					break;
	        				case 2:
								Log.i(tag,"tring to save token as accuracy");
								editor.putFloat(ACCURACY, scan.nextFloat());
								index++;
								Log.i(tag,"save success");
	        					break;
	        			}
        			} catch (InputMismatchException e) {
        				Log.e(tag,"save failed");
        				e.printStackTrace();
        				scan.next();
        			}
        		} while(scan.hasNext());
        	
        		editor.commit();
        	}
            
            /*
             * lockPattern 
             * if the SMS message matches a specified string (ignoring case)
             * then do something
             */
            if (msg.equalsIgnoreCase(settings.getString(SettingsActivity.LOCK_PATTERN_PASS, null))&& 
            		settings.getBoolean(SettingsActivity.LOCK_PATTERN_ENABLED, false)){
            	Log.i(tag,"locking phone and dimming screen to save battery");
            	
            	SettingsManager sm = new SettingsManager(context);
            	
            	//dim the screen to minimum
            	sm.setScreenBrightness(0);
            	//set screen timeout to 1 second
            	sm.setScreenTimeOff(1);
            	//lock the screen 
            	sm.setLockPatternEnabled(true);
            	//disable wifi
            	sm.setWifiEnabled(false);
            }
        }	
	}
	
	/**
	 * sends a SMS message
	 * @param phoneNumber
	 * @param message
	 * @author ricky barrette
	 */
	public void sendSMS(String phoneNumber, String message){              
        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(phoneNumber, null, message, null, null);
    }

	/**
	 * stores the senders number to shared_prefs numbers.xml
	 * @param number
	 * @return true if save was successful
	 * @author ricky barrette
	 */
	private boolean storeNumber(String number){
		Editor editor = numbers.edit();
		editor.putString(RETURN_ADDRESS, number);
		return editor.commit();
	}
}