/*
    	John Long
    	-Checks for a valid date
    */
    	public static boolean isValidDate(String userInput)
    	{
    		String dateElements[];
    		int ddInt, mmInt, yyInt;
    		int[] daysArray = {31,28,31,30,31,30,31,31,30,31,30,31};
    		boolean dateIsValid = true;
    		dateElements = userInput.split("/");
    		ddInt = Integer.parseInt(dateElements[0]);
    		mmInt = Integer.parseInt(dateElements[1]);
    		yyInt = Integer.parseInt(dateElements[2]);
    		if((ddInt == 0) || (mmInt == 0) || (yyInt == 0))
    			dateIsValid = false;
    		else if(mmInt > 12)
    			dateIsValid = false;
    		else if((ddInt == 29) && (mmInt == 2) && ((((yyInt % 4 == 0) && (yyInt % 100 != 0)) || (yyInt % 400 = 0))))
    			dateIsValid = true;
    		else if(ddInt > daysArray[mmInt - 1])
    			dateIsValid = false;
    		return dateIsValid;
    	}

/*
		John Long
		-This method searches for flights by departing airport and destination airport and prints the details of all
		 relevant flights
		-It takes 2 arguments, the source and destination airports as Strings
		-It returns void
	*/
	public static void searchFlightsSF(String source, String destination)
	{
		String aSource = "";
		String aDestination = "";
		int matches = 0;

		aSource = getAirportCode(source);
		aDestination = getAirportCode(destination);

		for(int i=0; i<flights.get(0).size(); i++)
		{
			if(aSource.equalsIgnoreCase(flights.get(1).get(i)) && aDestination.equalsIgnoreCase(flights.get(2).get(i)))
			{
				// Display flight details
				for(int j=0; j<8; j++)
				{
					System.out.print(flights.get(j).get(i));
				}
				System.out.println("");
				matches++;
			}
		}
		if (matches == 0)
			displayMessage(10);

	}

	/*
		John Long
		-This method searches for flights by departing airport, destination airport and departure date and prints the details of all
		 relevant flights
		-It takes 3 arguments, the source and destination airports as Strings and the departure date as a String
		-It returns void
	*/

	public static void searchFlightsSD(String source, String destination, String date) throws ParseException
	{
		String aSource = "";
		String aDestination = "";
		int matches = 0;

		SimpleDateFormat sdf = new SimpleDateFormat("dd/mm/yyyy");
		Date date1 = sdf.parse(date);

		aSource = getAirportCode(source);
		aDestination = getAirportCode(destination);
		boolean display1;
		boolean display2;

		for(int i=0; i<flights.get(0).size(); i++)
		{
			Date date2 = sdf.parse(flights.get(6).get(i));
			display1 = false;
		    display2 = false;
			if(aSource.equalsIgnoreCase(flights.get(1).get(i)) && aDestination.equalsIgnoreCase(flights.get(2).get(i)))
			{
				display1 = true;
			}

			if(date1.equals(date2))
				display2 = true;

			if(display1 == true && display2 == true)
			{
				// Display flight details
				for(int j=0; j<8; j++)
				{
					System.out.print(flights.get(j).get(i));
				}
				System.out.println("");
				matches++;
			}
		}

		if(matches==0)
			displayMessage(10);
	}

	/*
		John Long
		-This method gets the airport code for a particular airport name
		-It returns a String and takes 1 parameter, a String which is the name of the airport
	*/
	public static String getAirportCode(String name)
	{
		boolean found = false;
		String airportCode = "";
		for(int i = 0; i<airports.get(0).size() && !found; i++)
		{
			if(name.equalsIgnoreCase(airports.get(0).get(i)))
			{
				airportCode = airports.get(0).get(i);
				found = true;
			}
		}
		return airportCode;
	}