//Author: ^-^Veerle^-^
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JComboBox;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JOptionPane;
import javax.swing.BorderFactory;
import javax.swing.DefaultComboBoxModel;
import java.text.DecimalFormat;

public class calculatorPanCurrency extends JPanel
{
	
	private final Color clrBackground = new Color(75,141,221);
	private final Color clrForeground = new Color(255,255,255);
	private final DecimalFormat decFormat = new DecimalFormat("#0.00");
	
	private JComboBox cboxSource, cboxDes;
	private JButton cmdConvert;
	private JLabel lblSource, lblDes;
	private JPanel panRoot, panGrid, panSouthArea, panConvert;
	
	private String[] strCurrencies;
	private float[] conversionsFrom, conversionsTo;
	
	public calculatorPanCurrency (ActionListener mainApp)
	{

		lblSource = new JLabel("Convert From", JLabel.CENTER);
		lblDes = new JLabel("Convert To", JLabel.CENTER);
		
		cboxSource = new JComboBox();
		cboxDes = new JComboBox();
		
		cmdConvert = new JButton("Convert");
		cmdConvert.setActionCommand("currency");
		cmdConvert.addActionListener(mainApp);
		
		//Parses the xml file and gets the currencies and conversion rates, returns false if an error occurs
		//Could had put this in the if statement without the boolean, but it might be confusing for others as it wouldn't be apprant about an error
		boolean isError = setupXML();
		
		if (isError)
		{
			
			cboxSource.setEnabled(false); //stops the user from using the application
			cboxDes.setEnabled(false);
			cmdConvert.setEnabled(false);
			
		}
		else
		{
			
			cboxSource.setModel(getComboModel());
			cboxDes.setModel(getComboModel());
						
			if (strCurrencies.length > 1) //if more then one currency is used, set the second combo box to the next currency, instead of e.g. Pound to Pound
			{
				cboxDes.setSelectedIndex(1);
			}
			
		}
		
		panRoot = new JPanel(new BorderLayout());
		panGrid = new JPanel(new GridLayout(3,2,3,3));
		panSouthArea = new JPanel(new BorderLayout());
		panConvert = new JPanel();
		
		this.add(panRoot, BorderLayout.CENTER);
			panRoot.add(panGrid, BorderLayout.NORTH);
				panGrid.add(lblSource);
				panGrid.add(lblDes);
				panGrid.add(cboxSource);
				panGrid.add(cboxDes);
			panRoot.add(panSouthArea, BorderLayout.SOUTH);
				panSouthArea.add(panConvert, BorderLayout.NORTH);
					panConvert.add(cmdConvert);
				
		this.setBackground(clrBackground);
		panRoot.setBackground(clrBackground);
		panGrid.setBackground(clrBackground);
		panSouthArea.setBackground(clrBackground);
		panConvert.setBackground(clrBackground);
		
		panRoot.setBorder(BorderFactory.createEmptyBorder(3,3,3,3));
						
	}
	
	private DefaultComboBoxModel getComboModel ()
	{
		return new DefaultComboBoxModel(strCurrencies);
	}
	
	private boolean setupXML ()
	{
		
		boolean isError = false;
		
		calcReadXML conversionFile = new calcReadXML();
		
		try
		{
			conversionFile.parseConversionFile("conversions.xml");
		}
		catch (Exception ex)
		{
			
			JOptionPane.showMessageDialog(null, ex.getMessage(), "conversions.xml syntax error", JOptionPane.ERROR_MESSAGE);
			
			if (!conversionFile.getSecondChance())
			{
				isError = true;
			}		
			
		}
		
		if (!isError)
		{
		
			strCurrencies = conversionFile.getCurrencies();
			conversionsFrom = conversionFile.getConversionsFrom();
			conversionsTo = conversionFile.getConversionsTo();
			
		}
		
		return isError;
		
	}
	
	public String performConversion (float amount)
	{
		return "" + decFormat.format(((amount * conversionsFrom[cboxSource.getSelectedIndex()]) * conversionsTo[cboxDes.getSelectedIndex()]));		
	}
	
	public void setLanguage (String strLanguage)
	{
		
		if (strLanguage.equalsIgnoreCase("Dutch"))
		{
			
			lblSource.setText("Omwisselen van");
			lblDes.setText("Omwisselen tot");
			cmdConvert.setText("Omwisselen");
			cmdConvert.setToolTipText("Omwisselen van één tot andere");

		}
		else if (strLanguage.equalsIgnoreCase("Spanish"))
		{
			
			lblSource.setText("Convierta de");
			lblDes.setText("Convierta a");
			cmdConvert.setText("Convierta");
			cmdConvert.setToolTipText("Convierta de uno a otro");

		}
		else
		{
			
			lblSource.setText("Convert from");
			lblDes.setText("Convert to");
			cmdConvert.setText("Convert");
			cmdConvert.setToolTipText("Convert from one currency to the other");
			
		}
		
	}	
	
}