/*
 * Post-It program for Java. Let's user put rectangles on the screen, move
 * them, and remove them. Written 2/13/00 by Kim Bruce. Revised 2/15/04.
 */
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import structure.*;
import objectdraw.*;

public class PostIt extends WindowController implements ActionListener {
	protected static final int numJButtons = 3; // number of JButtons
	protected static final int hgap = 10; // gap between JButtons
	protected static final int vgap = 40;
	//	protected static final int canvasWidth = 180; // dimensions of canvas
	//	protected static final int canvasHeight = 150;
	protected JButton addJButton; // JButton to add window
	protected JButton deleteJButton; // JButton to delete window
	protected JComboBox colorSelect; // combo box to select color

	protected Vector pictVect = new Vector(); // Vector of objects on canvas
	// top-most object is last in vector
	protected boolean adding = false; // Was add JButton pushed
	protected boolean deleting = false; // Was deleting JButton pushed
	protected boolean moving = false; // In middle of moving square
	
	protected double left, top, width, height; // bounds of top rectangle

	protected Location lastPos; // last mouse position

	protected Rect postIt; // rectangle being drawn or moved

	protected Rect movingPostIt; // framed rect representing
	// rect being moved

	protected Color currentColor = Color.black; // color for drawing

	// Create JButtons and add to window
	public void begin() {
		// Set up add JButton
		addJButton = new JButton("Add");
		addJButton.addActionListener(this);

		// Set up delete JButton
		deleteJButton = new JButton("Delete");
		deleteJButton.addActionListener(this);

		// Set up color choice
		colorSelect = new JComboBox();
		colorSelect.addItem("Black");
		colorSelect.addItem("Red");
		colorSelect.addItem("Blue");
		colorSelect.addItem("Green");
		colorSelect.addItem("Cyan");
		colorSelect.addActionListener(this);

		// Set up panel to hold JButtons
		JPanel JButtonPanel = new JPanel(); // Panel to hold JButtons
		JButtonPanel.setLayout(new GridLayout(1, numJButtons, hgap, vgap));
		JButtonPanel.add(addJButton);
		JButtonPanel.add(deleteJButton);
		JButtonPanel.add(colorSelect);
		// Create layout and add JButtons and windowCanvas
		getContentPane().add(BorderLayout.SOUTH, JButtonPanel);
	}
	
	// Handle JButton clicks
	// PRE: User clicked on a JButton
	// POST: if clicked "add" JButton then remember adding
	//			if clicked "delete" JButton then remember deleting
	//			if clicked on "colorSelect" then remember current color
	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == addJButton) {
			adding = true;
			deleting = false;
		} else if (e.getSource() == deleteJButton) {
			if (pictVect.isEmpty()) {
				System.out.println("Nothing to delete!");
			} else {
				deleting = true;
				adding = false;
			}
		} else if (e.getSource() == colorSelect) {
			String colorName = (String) colorSelect.getSelectedItem();
			if (colorName.equals("Black")) {
				currentColor = Color.black;
			} else if (colorName.equals("Red")) {
				currentColor = Color.red;
			} else if (colorName.equals("Blue")) {
				currentColor = Color.blue;
			} else if (colorName.equals("Green")) {
				currentColor = Color.green;
			} else if (colorName.equals("Cyan")) {
				currentColor = Color.cyan;
			}
		}
	}
	
	// PRE: User has pressed mouse on canvas
	// POST: if adding, then create filled rect at current mouse position but 0
	// width and height.
	//       if deleting, then find window clicked on and remove 
	//				from window and vector
	//			if moving, then determine which window to move,hide filled rect,
	//				and create framed rect to be moved
	public void onMousePress(Location pos) {
		if (adding) {
			postIt = new FramedRect(pos, 0, 0, canvas);
			// Create new PostIt note outline
			postIt.setColor(currentColor);
			left = pos.getX(); // Save starting position
			top = pos.getY();
		} else if (deleting) {
			int windowIndex = findWindowIndex(pos);
			if (windowIndex != -1) {
				removeWindow(windowIndex);
			}
		} else {
			int windowIndex = findWindowIndex(pos);
			if (windowIndex != -1) {
				moving = true;
				moveToTop(windowIndex);

				postIt = (FilledRect) pictVect.elementAt(pictVect.size() - 1);
				postIt.hide(); // hide top-most note
				Bounds lastBds = postIt.getBounds(); // create framed note at
																// same position
				movingPostIt =
					new FramedRect(
						lastBds.getLocation(),
						lastBds.getWidth(),
						lastBds.getHeight(),
						canvas);
				movingPostIt.setColor(postIt.getColor()); 
				lastPos = pos;						// save where last clicked
			}
		}
	}
	
	// POST: if adding then resize rectangle to reach to new mouse posn
	//			if moving then move framed rect by amount of mouse motion
	public void onMouseDrag(Location pos) {
		double x = pos.getX(); // coords of mouse
		double y = pos.getY();
		if (adding) { // reset bounds of rect
			width = Math.abs(x - left);
			height = Math.abs(y - top);
			Bounds newBds =
				new Bounds(Math.min(x, left), Math.min(y, top), width, height);
			postIt.setBounds(newBds);
		} else if (moving) { // move by amount of last mouse motion
			movingPostIt.move(x - lastPos.getX(), y - lastPos.getY());
			lastPos = pos; // remember this mouse position
		}
	}
	
	// PRE: User has released mouse button
	// POST: if adding then add rectangle to Vector
	//			if moving then bring back filled rectangle and move to new posn. Hide
	// framed rect.
	public void onMouseRelease(Location pos) {
		if (adding) {
			adding = false;
			Bounds lastBds = postIt.getBounds(); // create framed note at
			// same position as framed
			postIt.removeFromCanvas(); // hide top-most note
			postIt =
				new FilledRect(
					lastBds.getLocation(),
					lastBds.getWidth(),
					lastBds.getHeight(),
					canvas);
			postIt.setColor(currentColor);
			pictVect.addElement(postIt); // add new rectangle to Vector
		} else if (moving) {
			postIt.setBounds(movingPostIt.getBounds());
			postIt.show();
			movingPostIt.removeFromCanvas();
			moving = false;
		} else {
			deleting = false;
		}
	}

	// post: returns index of top-most window containing pt or
	//       -1 if pt is in no window
	private int findWindowIndex(Location pt) {
		int windowIndex = pictVect.size() - 1;
		while (windowIndex >= 0
			&& !((Rect) pictVect.get(windowIndex)).contains(pt)) {
			windowIndex--;
		}
		return windowIndex;
	}

	// pre: 0 <= windowIndex < size()
	// post: window corresponding to windowIndex is moved to first
	//        element of vector and to top level of window
	private void moveToTop(int windowIndex) {
		Rect movingWindow = (Rect) pictVect.remove(windowIndex);
		pictVect.add(movingWindow);
		movingWindow.sendToFront();
	}

	// pre: 0 <= windowIndex < size()
	// post: window corresponding to windowIndex is removed from vector
	//        and screen
	private void removeWindow(int windowIndex) {
		Rect movingWindow = (Rect) pictVect.remove(windowIndex);
		movingWindow.removeFromCanvas();
	}
}