public class Ratuski_Nicholas_A5Q1 {
    /*
     * PURPOSE: calculate population change
     */
    
    //Count between start and end
    public static int countInRange(String text, char start, char end) {

        char[] textArray = text.toCharArray(); //Convert the string to an array
        int count; //How much in range?

        count = 0;
        for (int i=0;i<textArray.length;i++) {
        	if (((int)textArray[i] >= (int)start) && ((int)textArray[i] <= (int)end)) {
        		count++;
        	}
        }
        return count;
    }
    
    //Count between start and end
    public static long[] readLongData(int years, int start) {
    	String temp;
    	int numDigits;
    	int startYear;
        long[] yearArray = new long[years];
        
        for (int i=0; i<yearArray.length; i++) {
        	
        	yearArray[i] = start + i;
        	temp = JOptionPane.showInputDialog
	        ("Enter the population for year " + (start+i));
	        
	        numDigits = countInRange(temp,'0','9');
	        
	        while (numDigits < temp.length()) {
	        	temp = JOptionPane.showInputDialog
	        	("Enter the population for " + (start+i));
	       		numDigits = countInRange(temp,'0','9');
	        }
	        yearArray[i] = Long.parseLong(temp); 
	        System.out.println(yearArray[i]);
        }
        return yearArray;
    }
    
    public static double[] findChanges( long[] yearArray ) {
    	double[] percentChange = new double[yearArray.length - 1];
    	for (int i=1; i<yearArray.length; i++) {
    		percentChange[i-1] = (double)((yearArray[i] - yearArray[i-1])/yearArray[i-1]) * 100.0;  
    		System.out.println("VALUES FOR SLOT "+i+": initial: "+yearArray[i-1]+" final: "+yearArray[i]+" percent change: "+percentChange[i-1]);  		
    	}
    	return percentChange;
    }
    
    public static String getSpaces(int spaces) {
    	String line;
    	line = " ";
    	for (int i=0; i<spaces; i++) {
    		line = line + " ";
    	}
    	return line;
    }
    
    public static void printTable( double[] popChange, String name, int year ) {
    	int numStars,numSpaces;
    	String stars;
    	
    	numSpaces = 20; //default amount of spaces.
    	
    	System.out.println("Population change in "+name+": ("+year+" - "+(year+popChange.length)+").\n");
    	System.out.println("year|                     |");
    	
    	for (int i=0; i<popChange.length; i++) {
    		
    		numStars = (int) popChange[i];
    		stars = "";
    		for (int j=0; j<numStars; j++) {
    			stars = stars+"*";
    		}
    		if (numStars < 0) {
    			numSpaces += numStars;
    			System.out.println((year+i)+"|"+getSpaces(numSpaces)+stars+"|");
    		} else if (numStars > 0) {
    			numSpaces = numSpaces - numStars;
    			System.out.println((year+i)+"|"+getSpaces(20)+"|"+stars+getSpaces(numSpaces));
    		} else {
    			System.out.println((year+i)+"|"+getSpaces(20)+"|");
    		}	
    	}
    }
     
    public static void main (String [] args) {

        String temp;                           //temporary input string
        String name;                           //city name
       	int numCities;                         //how many cities to work with?
       	int numYears;                          //amount of years
       	int startYear;                         //year to start at
       	long[] yearArray;                      //array of years
       	double[] percentArray;                 //array of percent changes
     
        numCities = 1;
		temp = JOptionPane.showInputDialog
	    ("Enter how many cities you want to calculate the population changes for.");
	    numCities = Integer.parseInt(temp);
		
		for (int i=0; i<numCities; i++) {
		
		 	temp = JOptionPane.showInputDialog
	    	("Enter the name of the city.");
	    	name = temp;
	    	
	    	temp = JOptionPane.showInputDialog
	    	("Enter the number of years.");
	    	numYears = Integer.parseInt(temp);
	    	
	    	temp = JOptionPane.showInputDialog
	    	("Enter the starting year. (eg. 1989)");
	    	startYear = Integer.parseInt(temp);
	    	
	    	yearArray = readLongData(numYears, startYear);
	    	percentArray = findChanges(yearArray);
	    	printTable(percentArray, name, startYear);
		 	
		}
		System.out.println("\n\nProgrammed by Nick Ratuski");
   		System.out.println("Date: Saturday, November 17");
	}
}