package cse308.swift.tool;

import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.sql.Timestamp;

/**
 * SwiftToolBox is a utility that aids in mundane tasks such as conversions.
 * To obtain a toolbox, it must be requested statically as it is a singleton.
 * 
 * @author Kenny Law
 *
 */
public class SwiftToolBox {
	
	/**
	 * Instance of this SwiftToolBox singleton
	 */
	private static SwiftToolBox instance;
	
	/**
	 * Money formatter (possible round off error)
	 */
	NumberFormat moneyFormatter = new DecimalFormat("#.00"); //NOTE POSSIBLE ROUND OFF AMBIGUITY
	
	private SwiftToolBox ()	{}
	
	public static SwiftToolBox getInstance() 
	{
		if (instance == null)	{
			instance = new SwiftToolBox();
		}
		
		return instance;
	}
	
	/**
	 * Returns a timestamp given a properly formatted string.
	 * @author Chun Li
	 * @param datetime is the string to be converted to a Timestamp
	 * @return The timestamp representative of the string: Timestamp
	 * @throws ParseException If the string is not parseable
	 */
	public Timestamp getTimeStampFromString(String datetime) throws ParseException	
	{
		SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
		java.util.Date parsedDate = null;
		
		parsedDate = dateFormat.parse(datetime);

		Timestamp timestamp = new Timestamp(parsedDate.getTime());
		return timestamp;
	}
	
	/**
	 * Returns a double properly money formatted
	 * @param amount The amount of money as a double
	 * @return A double formatted for currency: double
	 */
	public double moneyFormatt(double amount)	
	{
		return Double.parseDouble(moneyFormatter.format(amount));
	}
	
	/**
	 * Returns a double properly money formatted
	 * @param amount The amount of money as a string
	 * @return A double formatted for currency: double
	 * @throws NumberFormatException If the string is not completely numeric
	 */
	public double moneyFormatt(String amount) throws NumberFormatException	
	{
		return Double.parseDouble(moneyFormatter.format(Double.parseDouble(amount)));
	}
}