/**  
 * 
 * This is a http://en.wikipedia.org/wiki/MACD
 *  http://investexcel.net/how-to-calculate-macd-in-excel/
 *  
 *  @author Freeman Lo
 *  @version 0.0.1 Build 1 April 1, 2014.
 *  Limitations - 
 * 
 *
 */

import java.util.ArrayList;

public class ProcessEMA12 {
	
	ArrayList <String> sArrList = new ArrayList <String> ();
	ArrayList <Double> ema12 = new ArrayList <Double> ();
		
	public ProcessEMA12 (ArrayList<String> sArrList) {
		this.sArrList = sArrList;
	}	
	
	private ArrayList <String> getCloseValues() {
		
		ArrayList <String> closeValues = new ArrayList <String> ();
		String [] words = new String[6];
				
		int a=0;
		while ( a < this.sArrList.size() ) {
			String line = this.sArrList.get(a);
			words = line.split(",");
			for (int x = 0; x < words.length; x++){
				if ( x == 4 ) {
					closeValues.add(words[4]);
				}
			}
			a+=1;
		}
		
		return closeValues;
	}
	
	private double getAverage() {
		
		ArrayList <String> closeValues = getCloseValues();
		
		double avgValue = 0.00;
		
		for ( int item = 0; item < 12; item++ ) {
			avgValue += Double.parseDouble(closeValues.get(item));
		}
		avgValue = avgValue / 12.00;

		return avgValue;
	}
	
	public ArrayList<Double> computeEMAValues() {
		
		ArrayList <String> closeValues = getCloseValues(); 
		double avgvalue = 0.00;
		double result = 0.00;
	
		avgvalue = getAverage();
		this.ema12.add(avgvalue);
		
		for ( int item = 0; item < closeValues.size()-12; item++ ) {
			// starts with 0, so 12 is actually 13th place
			// Formular to compute EMA12
			result = (( Double.parseDouble(closeValues.get(item+12))* (2.00 / (12.00+1.00))) + (this.ema12.get(item)) * ((1.00 - (2.00 / (12.00+1.00) ))));
			
			this.ema12.add(result);
		}
		
		return ema12;
	}
}