import java.awt.GridLayout;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTextField;

/**
 * This is the view for the Unit Converter application.
 */
public class UnitConvView extends JFrame
{
	private JMenuBar menuBar;
	private JMenu fileMenu;
	private JMenuItem saveItem;
	private JMenuItem resetItem;
	private JTextField inputValue;
	private JTextField resultValue;
	private JButton cmToInches;
	private JButton inchesToCm;
	private JButton cToF;
	private JButton fToC;
	private JButton lbsToKg;	
	private JButton kgToLbs;
	private final JFileChooser fileDialog;
	
	/**
	 * Initializes this view.
	 * @param model the model to associate with this view
	 */
	public UnitConvView(UnitConvModel model)
	{
		super("Unit Converter");
		model.clear();
		
		this.menuBar = new JMenuBar();
		this.setJMenuBar(this.menuBar);
		
		this.fileMenu = new JMenu("File");
		this.menuBar.add(this.fileMenu);
		
		this.resetItem = new JMenuItem("Reset");
		this.fileMenu.add(resetItem);
		
		this.saveItem = new JMenuItem("Save...");
		this.fileMenu.add(saveItem);
		
		this.inputValue = new JTextField(20);
		this.resultValue = new JTextField(20);
		this.resultValue.setText("" + model.getResultValue());
		this.resultValue.setEditable(false);
		
		this.cToF = new JButton("\u00B0C to \u00B0F");
		this.fToC = new JButton("\u00B0F to \u00B0C");
		this.cmToInches = new JButton("cm to inches");
		this.inchesToCm = new JButton("inches to cm");
		this.kgToLbs = new JButton("kg to lbs");
		this.lbsToKg = new JButton("lbs to kg");
		
		this.fileDialog = new JFileChooser();
		
		this.setLayout(new GridLayout(5, 2));
		this.add(new JLabel("Input Value"));
		this.add(this.inputValue);
		this.add(new JLabel("Result Value"));
		this.add(this.resultValue);
		this.add(this.cToF);
		this.add(this.fToC);
		this.add(this.cmToInches);
		this.add(this.inchesToCm);
		this.add(this.kgToLbs);
		this.add(this.lbsToKg);
		this.pack();
		
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		UnitConvController controller = new UnitConvController(model, this);
	}


	/**
	 * Get the string value of the result text field.
	 * 
	 * @return The string in the result text field.
	 */
	public String getResultValue()
	{
		return this.resultValue.getText();
	}
	
	/**
	 * Get the string value of the user input text field.
	 * 
	 * @return The string in the user input text field.
	 */
	public String getInputValue()
	{
		// TODO (1 line of code): Return the contents of the text field.
		// Use getResultValue as a guide.
		;
	}
	
	/**
	 * Set the string for the user input text field.
	 * 
	 * @param value The new value for the user input text field.
	 * @pre. value is not null
	 */
	public void setInputValue(String value)
	{
		this.inputValue.setText(value);
	}
	
	/**
	 * Set the string for the calculated value text field.
	 * 
	 * @param value The new value for the calculated value text field.
	 * @pre. value is not null
	 */
	public void setResultValue(String value)
	{
		// TODO (1 line of code): Set the contents of the text field.
		// Use setInputValue as a guide.
		;
	}
	
	/**
	 * Shows a file chooser for the user to select the file to save.
	 *  
	 * @return The file chosen by the user, or null if no file was chosen.
	 */
	public File getSaveFile()
	{
		int returnVal = this.fileDialog.showSaveDialog(this);
		if(returnVal == JFileChooser.APPROVE_OPTION) 
		{
			return this.fileDialog.getSelectedFile();
		}
		return null;
	}
	
	/**
	 * Add a listener for the reset menu item.
	 * 
	 * @param t the action listener
	 */
	public void addResetListener(ActionListener t)
	{
		this.resetItem.addActionListener(t);
	}

	/**
	 * Add a listener for the save menu item.
	 * 
	 * @param t the action listener
	 */
	public void addSaveListener(ActionListener t)
	{
		this.saveItem.addActionListener(t);
	}

	/**
	 * Add a listener for the "C to F" button.
	 * 
	 * @param t the action listener
	 */
	public void addCtoFListener(ActionListener t)
	{
		this.cToF.addActionListener(t);
	}

	/**
	 * Add a listener for the "F to C" button.
	 * 
	 * @param t the action listener
	 */
	public void addFtoCListener(ActionListener t)
	{
		// TODO (1 line of code): add the listener to the fToC button.
		// Use the above listeners as a guide.
		;
	}

	/**
	 * Add a listener for the "cm to inches" button.
	 * 
	 * @param t the action listener
	 */
	public void addCmToInchesListener(ActionListener t)
	{
		// TODO (1 line of code): add the listener to the cmToInches button.
		// Use the above listeners as a guide.
		;
	}

	/**
	 * Add a listener for the "inches to cm" button.
	 * 
	 * @param t the action listener
	 */
	public void addInchesToCmListener(ActionListener t)
	{
		// TODO (1 line of code): add the listener to the inchesToCm button.
		// Use the above listeners as a guide.
		;
	}

	/**
	 * Add a listener for the "kg to lbs" button.
	 * 
	 * @param t the action listener
	 */
	public void addKgToLbsListener(ActionListener t)
	{
		// TODO (1 line of code): add the listener to the kgToLbs button.
		// Use the above listeners as a guide.
		;
	}

	/**
	 * Add a listener for the "lbs to kg" button.
	 * 
	 * @param t the action listener
	 */
	public void addLbsToKgListener(ActionListener t)
	{
		// TODO (1 line of code): add the listener to the lbsToKg button.
		// Use the above listeners as a guide.
		;
	}

}