import java.awt.*; 
import java.applet.*;
import java.awt.event.*;
public class Assignment1 extends Applet implements ActionListener {
	
	// Constants 
	private static final Color defaultTopColor = Color.red;
	private static final Color defaultMiddleColor = Color.yellow;
	private static final Color defaultBottomColor = Color.blue;
	private static final String RED = "Red";
	private static final String YELLOW = "Yellow";
	private static final String BLUE = "Blue";
	private static final String RESET = "Reset";
	private static final String TOP_LIST_LABEL = "Top Row Colors";
	private static final String MIDDLE_LIST_LABEL = "Middle Row Colors";
	private static final String BOTTOM_LIST_LABEL = "Bottom Row Colors";
	
	// Instance Variables
	private Panel mainPanel, boardPanel, listsPanel;
	private Board board;
	private Button resetButton;
	private List topRowColorList, middleRowColorList, bottomRowColorList;
	
	public void init() { 
		// Create the main panel and all of its components and add them to panel applet.
		mainPanel = makeMainPanel();
		boardPanel = makeBoardPanel();
		listsPanel = makeListsPanel();
		this.add(mainPanel);
		this.addListeners();
	}
	
	private List makeColorList(int itemNumber){
		// Create a List with the 3 colour options; preselect the item with the given itemNumber
		List list = new List(3, false);
		list.add(RED);
		list.add(YELLOW);
		list.add(BLUE);
		list.select(itemNumber);
		return list;
	}
	private Panel makeListsPanel() {
		// Make Labels and Lists for row colour choices, add them to a Panel
		// The Panel uses GridLayout, 2 rows and 3 columns
		topRowColorList = makeColorList(0);
		middleRowColorList = makeColorList(1);
		bottomRowColorList = makeColorList(2);
		Panel panel = new Panel();
		panel.setLayout(new GridLayout(2, 3, 0, 0));
		panel.add(new Label(Assignment1.TOP_LIST_LABEL, 1));
		panel.add(new Label(Assignment1.MIDDLE_LIST_LABEL, 1));
		panel.add(new Label(Assignment1.BOTTOM_LIST_LABEL, 1));
		panel.add(this.topRowColorList);
		panel.add(this.middleRowColorList);
		panel.add(this.bottomRowColorList);
		return panel;
	}
	
	private Panel makeBoardPanel() {
		// Create a Board using the default row colours, create a reset Button;
		// add panel Board and Button to a Panel (which uses FlowLayout)
		Panel panel = new Panel();
		panel.setLayout(new FlowLayout());
		board = new Board(Assignment1.defaultTopColor, Assignment1.defaultMiddleColor, Assignment1.defaultBottomColor);
		panel.add(this.board.getBoard());
		resetButton = new Button(Assignment1.RESET);
		panel.add(this.resetButton);
		return panel;
	}
	
	private Panel makeMainPanel() {
		// create and return the Panel which contains the boardPanel and the ListsPanel 
		// The Panel uses GridLayout, 2 rows and 1 column
		boardPanel = makeBoardPanel();
		listsPanel = makeListsPanel();
		Panel panel = new Panel();
		panel.setLayout(new GridLayout(2, 1, 0, 0));
		panel.add(this.boardPanel);
		panel.add(this.listsPanel);
		return panel;
	}
	
	
	private void addListeners() {
		// Adds the Applet as the ActionListener for the various components
		board.getSquare("1").addActionListener(this);
        board.getSquare("2").addActionListener(this);
        board.getSquare("3").addActionListener(this);
        board.getSquare("4").addActionListener(this);
        board.getSquare("5").addActionListener(this);
        board.getSquare("6").addActionListener(this);
        board.getSquare("7").addActionListener(this);
        board.getSquare("8").addActionListener(this);
        board.getSquare("9").addActionListener(this);
        resetButton.addActionListener(this);
        topRowColorList.addActionListener(this);
        middleRowColorList.addActionListener(this);
        bottomRowColorList.addActionListener(this);
	}
	
	private Color makeColor(String colString) {
		// Return a Color corresponding to the given String
		if(colString.equals(RED))
            return Color.red;
        if(colString.equals(YELLOW))
            return Color.yellow;
        if(colString.equals(BLUE))
            return Color.blue;
        else
            return null;
	}
	
	public void actionPerformed(ActionEvent event) {
		// Responds appropriately to whichever button has been clicked
		// If Reset has been clicked, change row colours to the selected colours, else move the square that has been clicked
		Color topColor = makeColor(this.topRowColorList.getSelectedItem());
        Color middleColor = makeColor(this.middleRowColorList.getSelectedItem());
        Color bottomColor = makeColor(this.bottomRowColorList.getSelectedItem());
        String whichButton = event.getActionCommand();
        if (whichButton.equals(Assignment1.RESET))
        {
            this.board.changeRowColor(1, topColor);
            this.board.changeRowColor(2, middleColor);
            this.board.changeRowColor(3, bottomColor);
            this.board.paintSquares();
        } 
        else
        {
        	this.board.move(whichButton);
        }
	}
	
}// end of Assignment1 class