// JBoardTest.java

import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.event.*;

/**
 JBoardTest is a unit test application for tetris -- its
 sole purpose is exercising the tetris classes.
 Its interface only make sense if you think of it
 as a direct connection to the Board and Piece interfaces.
 JBoardTest is provided in finished form so the students
 can use it to test their Piece and Board code.
 
 <p>
 Use the buttons on screen or the
 keys 4, 5, 6, 7, 0 for control.
 Add a piece, move it around.
 JBoardTest uses place() and undo() to
 move the piece around the board.
 Use the app to set up and test out specific
 cases for your tetris board and piece.
 
 <p>
 <b>Transparency</b> --
 Board has all sorts of hidden state --
 heights, widths etc.. The hidden state
 is what makes Board hard to debug.
 The unit test tries to make the state of the Board
 transparent, so you can see what's going on as you exercise
 your code.
*/

class JBoardTest extends JComponent {
	// Board data structures
	private Board board;
	private Piece[] pieces;
	
	private JLabel label;
	
	// The currently played piece
	// null if there is no current piece
	private Piece piece;
	private int pieceX;
	private int pieceY;
	
	public JBoardTest(int width, int height) {
		super();
		
		setPreferredSize(new Dimension(width, height));

		pieces = Piece.getPieces();
		
		reset();
	}
	
	
	private void reset() {
		board = new Board(6, 10);
        piece = null;
    }


	/**
	 Whenever the user clicks a button, this runs
	 to make the change. The strategy is:
	 compute what the new piece position should be,
	 undo to remove the old piece position,
	 put in the new piece position.
	*/
	
	public final int ADD = 1;
	public final int ADDRANDOM = 2;
	public final int LEFT = 3;
	public final int RIGHT = 4;
	public final int ROTATE = 5;
	public final int DOWN = 6;
	public final int DROP = 7;
	public final int CLEAR = 8;
	public final int RESET = 9;
	public final int UNDO = 10;
	 
	public void action(int verb) {
	    if (verb==RESET) {
	       reset();
	    }
	    else if (verb==UNDO) {
	        board.undo();
	    }
        else if (verb==CLEAR) {
			if (board.clearRows()) {
				board.commit();	// finalize the last position
				piece = null;
			}
		}
		else {
			// compute a new piece based on the old piece and the verb
			Piece newPiece = piece;
			int newX = pieceX;
			int newY = pieceY;
		
			switch (verb) {
				case ADD:
				case ADDRANDOM:
					// finalize the last position
					board.commit();
					piece = null;
					
					if (verb==ADD) newPiece = pieces[6];
					else newPiece = pieces[(int)(Math.random()*pieces.length)];

					newX = 0;
					newY = board.getHeight() - newPiece.getHeight() -1;
					break;

				case LEFT: newX--; break;

				case RIGHT: newX++; break;

				case ROTATE:
					if (piece!=null) newPiece = piece.nextRotation();
					break;
					
				case DOWN: newY--; break;

				case DROP:
				// remove the piece before the drop computation so
				// it doesn't hit itself on the way down!
					if (piece!=null) {
						 board.undo();
						 newY = board.dropHeight(newPiece, newX);
					}
					break;

				default:
					throw new RuntimeException("Bad verb");
			}
			
			// now we have a newPiece
				
			if (newPiece!=null) {

				board.undo();	// remove the old state
				
				// Try putting in the new piece	
				int result = board.place(newPiece, newX, newY);
				
				// See if it worked
				if (result <= Board.PLACE_ROW_FILLED) {
					piece = newPiece;
					pieceX = newX;
					pieceY = newY;
				}
				else {
					// System.out.println("bad placement:" + result);
					label.setText("bad:" + result);
					
					
					// put it back the way it was
					board.undo();
					if (piece!=null) {
						board.place(piece, pieceX, pieceY);
					}
				}
			}
		}

		// Redraw the whole board since we've changed it
		repaint();
	}
		




	
	/**
	 Pixel helpers -- these centralize how
	 we map from block coords (x,y) to pixel
	 co-ords on screen. By centralizing here,
	 at least it's all consistent.
	 These return the distance in pixels
	 from the left or botton edge
	 to the upper left corner of the rect
	 for each tetris block.
	*/
	private int xPixelDist(int x, float dx) {
		return(MARGIN + Math.round(x*dx));
	}
	
	private int yPixelDist(int y, float dy) {
		return(Math.round((y+1)*dy));
	}
	
	// pixel space on the left and bottom
	public final int MARGIN = 20;

	public void paintComponent(Graphics g) {
		// area where tetris blocks are drawn
		int pixelWidth = getWidth()-MARGIN;
		int pixelHeight = getHeight()-MARGIN;
		
		// block size of the board
		int bWidth = board.getWidth();
		int bHeight = board.getHeight();
		int bMaxHeight = board.getMaxHeight();
		
		// pixels across of each block
		float dx = ((float)pixelWidth)/bWidth;
		float dy = ((float)pixelHeight)/bHeight;
		
		g.drawRect(MARGIN, 0, pixelWidth-1, pixelHeight-1);

		int x, y;
		
		// draw the board blocks and the bits of text...
		for (y=0; y<bMaxHeight; y++) {
			// draw row width on the left
			g.drawString(Integer.toString(board.getRowWidth(y)),
				4, pixelHeight - yPixelDist(y-1, dy) - 4);
				
			for (x=0; x<bWidth; x++) {
				if (board.getGrid(x, y)) {
					// emphasize the col height in green
					if (board.getColumnHeight(x)==y+1) g.setColor(Color.green);
					
					// draw the block, inset by one pixel all around
					g.fillRect( xPixelDist(x, dx)+1,
								pixelHeight - yPixelDist(y, dy)+1,
								(int)dx-2, (int)dy-2);
								
					g.setColor(Color.black);
				}
			}
		}

		// draw the height numbers along the bottom
		for (x=0; x<bWidth; x++) {
			g.drawString(Integer.toString(board.getColumnHeight(x)),
				xPixelDist(x, dx)+6, pixelHeight+MARGIN-4);
		}

	}
	
	
		
	/**
	 Creates all the buttons in a panel, and wire them
	 to the action() message.
	 
	 Installs keyboard listeners and wire them to the action()
	 message as well.
	*/
	public java.awt.Container createControlPanel() {
		java.awt.Container panel = new Box(BoxLayout.Y_AXIS);
		
		JButton button;

		button = new JButton("Add");
		panel.add(button);
		button.addActionListener( new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				action(ADD);
			}
		});
		
		button = new JButton("Add Random");
		panel.add(button);
		button.addActionListener( new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				action(ADDRANDOM);
			}
		});
		
		button = new JButton("Left");
		panel.add(button);
		button.addActionListener( new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				action(LEFT);
			}
		});
		
		button = new JButton("Right");
		panel.add(button);
		button.addActionListener( new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				action(RIGHT);
			}
		});
		
		button = new JButton("Rotate");
		panel.add(button);
		button.addActionListener( new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				action(ROTATE);
			}
		});
		
		button = new JButton("Down");
		panel.add(button);
		button.addActionListener( new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				action(DOWN);
			}
		});
		
		button = new JButton("Drop");
		panel.add(button);
		button.addActionListener( new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				action(DROP);
			}
		});
		
		button = new JButton("Clear Rows");
		panel.add(button);
		button.addActionListener( new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				action(CLEAR);
			}
		});

		label = new JLabel();
		panel.add(label);

		panel.add(Box.createVerticalStrut(12));

		button = new JButton("Undo");
		panel.add(button);
		button.addActionListener( new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				action(UNDO);
			}
		});
	
		button = new JButton("Reset");
		panel.add(button);
		button.addActionListener( new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				action(RESET);
			}
		});

		button = new JButton("Quit");
		panel.add(button);
		button.addActionListener( new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				System.exit(0);
			}
		});
			

		
		// Register the 4 keystroke listeners
		// to call action() with the appropriate constant.
		// 4=left 5=rotate 6=right 0=drop 7=add
		registerKeyboardAction(
			new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					action(ADD);
				}
			},
			"add",
			KeyStroke.getKeyStroke('7'),
			WHEN_IN_FOCUSED_WINDOW
		);
		
		registerKeyboardAction(
			new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					action(LEFT);
				}
			},
			"left",
			KeyStroke.getKeyStroke('4'),
			WHEN_IN_FOCUSED_WINDOW
		);

	   	registerKeyboardAction(
	   		new ActionListener() {
	   			public void actionPerformed(ActionEvent e) {
	   				action(RIGHT);
	   			}
	   		},
	   		"right",
	   		KeyStroke.getKeyStroke('6'),
	   		WHEN_IN_FOCUSED_WINDOW
	   	);
	   	
	   	registerKeyboardAction(
	   		new ActionListener() {
	   			public void actionPerformed(ActionEvent e) {
	   				action(ROTATE);
	   			}
	   		},
	   		"rotate",
	   		KeyStroke.getKeyStroke('5'),
	   		WHEN_IN_FOCUSED_WINDOW
	   	);
	   	
	   	registerKeyboardAction(
	   		new ActionListener() {
	   			public void actionPerformed(ActionEvent e) {
	   				action(DROP);
	   			}
	   		},
	   		"drop",
	   		KeyStroke.getKeyStroke('0'),
	   		WHEN_IN_FOCUSED_WINDOW
	   	);

		return(panel);
	}

	/*
	 Creates a frame for the board tester
	 and its controls.
	*/
	static public void main(String[] args)
	
	{
		JFrame frame = new JFrame("JBoardTest");
		JComponent container = (JComponent)frame.getContentPane();
		container.setLayout(new BorderLayout());
		
		JBoardTest bt = new JBoardTest(200, 300);

		container.add(bt, BorderLayout.CENTER);
		
		Container panel = bt.createControlPanel();
		container.add(panel, BorderLayout.EAST);
		
		frame.pack();
		frame.setVisible(true);
		
		// Quit on window close
		frame.addWindowListener(
			new WindowAdapter() {
				public void windowClosing(WindowEvent e) {
					System.exit(0);
				}
			}
		);
	}
}