//Mitchell Smith
//Homework 2 - Performing and formatting weather calculations
package homework2;
import java.io.File;
import java.io.IOException;
import java.util.Scanner;

public class Homework_2 {

	public static void main(String[] args) throws IOException {

	System.out.println("Mitchell Smith\nCOS225 Assgn2\nThis program computes temperature statistics\n");

	String town,														//Town weather was reported in
	date = null,														//Date weather was reported. MM/DD/YY format
	direction,															//Direction of wind
	weather_data,														//Entire line of weather data
	temp_type,															//C or F degrees
	avgmon;																//Months used in averages.txt
	double temp = 0,													//Temperature in weather.txt
	wind = 0,															//Speed of wind in weather.txt
	celcius,															//Temperature in celcius
	fahrenheit,															//Temperature in fahrenheit
	chill,																//Result of chill equation
	windavg = 0,														//Average of all wind
	favg = 0,															//Average of fahrenheit temp
	cavg = 0,															//Average of celcius temp
	avgtemp,															//Average temps per month from averages.txt
	realavgtemp = 0;													//Average temp of month used
	int count = 0,														//A count to keep track of # of lines in weather.txt
	istrue = 1,															//If everything works this value is 1, if something fails value is 0 and prints N/A for values
	month;																//Numerical month, 1-12



	String divider = "-------------------------------------------------------------------------------------------------";

	Scanner file_reader = new Scanner(new File("weather.txt"));
	Scanner average_reader = new Scanner(new File("averages.txt"));


	System.out.println("Town      	   Date        Wind Speed       Direction      F              C          Wind Chill");
	System.out.println(divider);

	while(file_reader.hasNext())										//If the next line exists
	{
		weather_data = file_reader.nextLine();
		Scanner line_scanner = new Scanner(weather_data);				//Search the next line

		while(line_scanner.hasNext()){
			town = line_scanner.next();
			date = line_scanner.next();

			if (line_scanner.hasNextDouble()){
			wind = line_scanner.nextDouble();
			}

			else{														//If data isn't there set istrue to not 1
				wind = 404;												//Set wind to 404 to ensure user knows error
				istrue = 0;
				}

			direction = line_scanner.next();

			if (line_scanner.hasNextDouble()){
				temp = line_scanner.nextDouble();
				}

			else{
				temp = 404;												//If data isn't there set istrue to not 1
				istrue = 0;												//Set temp to 404 to show error
				}
			temp_type = line_scanner.next();
			String weatherManFirst = line_scanner.next();               //These aren't used, I just can't work around it...
			String weatherManLast = line_scanner.next();				//...without killing the entire program
			count++;

			if (temp_type.equals("C")){        							//Converts C -> F and assigns both to seperate doubles
				celcius= temp;
				fahrenheit = toFahrenheit(celcius);
			}
			else{                                                     	//Converts F-> C and assigns both to seperate doubles
				fahrenheit = temp;
				celcius = toCelsius(fahrenheit);
			}
			windavg += wind;											//Gets the sum of the wind
			favg += fahrenheit;
			cavg += celcius;
			chill = getWindChill(celcius, wind);

			System.out.printf("%-17s %4s %10.2f %13s %13.2f %14.2f %15.2f\n",town, date, wind, direction, fahrenheit, celcius, chill);

		}
		line_scanner.close();
	}
	String[] parts = date.split("/");									//Splits into MM, DD, YY
	date = parts[0]; 													//Grabs the first chunk, aka MM
	month = Integer.parseInt(date);										//Saves as an int
	date = checkMonth(month);											//Changes int month to string
	System.out.println("\n\nAll readings taken for month: "+date);
	System.out.println("Number of readings: "+count);

	if( istrue == 1)													//If everything works as intended give the averages
	{
	windavg = Double.parseDouble(getAverage(count,windavg));
	favg = Double.parseDouble(getAverage(count,favg));
	cavg = Double.parseDouble(getAverage(count,cavg));
	System.out.printf("Average wind speed: %.2f",windavg);
	System.out.printf("\nAverage temperature (F): %.2f ",favg);
	System.out.printf("\nAverage temperature (C): %.2f",cavg);
	}
	else																//Print N/A if a data type is non-existant
	{
	System.out.println("Average wind speed: N/A");
	System.out.println("Average temperature (F): N/A");
	System.out.println("Average temperature (C): N/A");
	}
	System.out.println(" \n");
	System.out.println("Historical Averages");
	System.out.println("Month                          Temp Average (F)");
	System.out.println("-------------------------------------------------");
	for(int ct1= 0; ct1 <=11;ct1++){									//1-12
        avgmon = average_reader.next();
        avgtemp = average_reader.nextDouble();
        if(month-1 == ct1)												//ct1 starts at 0 so month-1 is just setting both to start at 0
        {
        	realavgtemp = avgtemp;										//If ct1 and month-1 coincide assign avgtemp to a more perminent state
        }
        System.out.printf("%-10s                %10.2f \n",avgmon,avgtemp);
}
	if (istrue == 1)													//If all values were there continue as normal
    {
		favg -= realavgtemp;
    	System.out.printf("\nThe difference this "+date+" from historical average is %.2f",favg);
    }
    else																//If a value was missing
    {
    	System.out.println("\nThe difference this "+date+" from historical average is N/A");
    }
	file_reader.close();
	average_reader.close();
	}


	private static double getWindChill(double celcius, double wind) {	//POST: Will return value of windchill
		return 33 - ((10*(Math.sqrt(wind))-wind+10.5)*(33-celcius)/23.1);
	}

	private static double toCelsius(double fahrenheit) {				//POST: Will return celcius degrees
		return (5.0/9.0)*(fahrenheit-32.0);
	}

	private static double toFahrenheit(double celcius) {				//POST: Will return fahrenheit degrees
		return 1.8*celcius+32.0;
	}
	private static String getAverage(int count, double sum){			//PRE: Count has to be greater than 0
		double avg;														//POST: Will return average
		String outavg;
		{
			avg = sum/count;
			outavg = String.valueOf(avg);
			return outavg;
		}
	}
	private static String checkMonth(int month)							//PRE: Int from 1-12
	{																	//POST: Return a string for the month
		String[] months = {"January","Febuary","March","April","May","June","July",
				"August","September","October","November","December"};
		return months[month-1];
	}
}