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package org.l2jmobius.tools.dbinstaller.util.swing;

import java.awt.Component;
import java.awt.Container;

import javax.swing.Spring;
import javax.swing.SpringLayout;

/**
 * A 1.4 file that provides utility methods for creating form- or grid-style layouts with SpringLayout.<br>
 * These utilities are used by several programs, such as SpringBox and SpringCompactGrid.
 */
public class SpringUtilities
{
	/**
	 * A debugging utility that prints to stdout the component's minimum, preferred, and maximum sizes.
	 * @param c
	 */
	public static void printSizes(Component c)
	{
		System.out.println("minimumSize = " + c.getMinimumSize());
		System.out.println("preferredSize = " + c.getPreferredSize());
		System.out.println("maximumSize = " + c.getMaximumSize());
	}
	
	/**
	 * Aligns the first <code>rows</code> * <code>cols</code> components of <code>parent</code> in a grid. Each component is as big as the maximum preferred width and height of the components. The parent is made just big enough to fit them all.
	 * @param parent
	 * @param rows number of rows
	 * @param cols number of columns
	 * @param initialX x location to start the grid at
	 * @param initialY y location to start the grid at
	 * @param xPad x padding between cells
	 * @param yPad y padding between cells
	 */
	public static void makeGrid(Container parent, int rows, int cols, int initialX, int initialY, int xPad, int yPad)
	{
		SpringLayout layout;
		try
		{
			layout = (SpringLayout) parent.getLayout();
		}
		catch (ClassCastException exc)
		{
			System.err.println("The first argument to makeGrid must use SpringLayout.");
			return;
		}
		
		final Spring xPadSpring = Spring.constant(xPad);
		final Spring yPadSpring = Spring.constant(yPad);
		final Spring initialXSpring = Spring.constant(initialX);
		final Spring initialYSpring = Spring.constant(initialY);
		final int max = rows * cols;
		
		// Calculate Springs that are the max of the width/height so that all
		// cells have the same size.
		Spring maxWidthSpring = layout.getConstraints(parent.getComponent(0)).getWidth();
		Spring maxHeightSpring = layout.getConstraints(parent.getComponent(0)).getWidth();
		for (int i = 1; i < max; i++)
		{
			final SpringLayout.Constraints cons = layout.getConstraints(parent.getComponent(i));
			maxWidthSpring = Spring.max(maxWidthSpring, cons.getWidth());
			maxHeightSpring = Spring.max(maxHeightSpring, cons.getHeight());
		}
		
		// Apply the new width/height Spring. This forces all the
		// components to have the same size.
		for (int i = 0; i < max; i++)
		{
			final SpringLayout.Constraints cons = layout.getConstraints(parent.getComponent(i));
			cons.setWidth(maxWidthSpring);
			cons.setHeight(maxHeightSpring);
		}
		
		// Then adjust the x/y constraints of all the cells so that they
		// are aligned in a grid.
		SpringLayout.Constraints lastCons = null;
		SpringLayout.Constraints lastRowCons = null;
		for (int i = 0; i < max; i++)
		{
			final SpringLayout.Constraints cons = layout.getConstraints(parent.getComponent(i));
			if ((i % cols) == 0)
			{ // start of new row
				lastRowCons = lastCons;
				cons.setX(initialXSpring);
			}
			// x position depends on previous component
			else if (lastCons != null)
			{
				cons.setX(Spring.sum(lastCons.getConstraint(SpringLayout.EAST), xPadSpring));
			}
			
			if ((i / cols) == 0)
			{
				// first row
				cons.setY(initialYSpring);
			}
			// y position depends on previous row
			else if (lastRowCons != null)
			{
				cons.setY(Spring.sum(lastRowCons.getConstraint(SpringLayout.SOUTH), yPadSpring));
			}
			lastCons = cons;
		}
		
		// Set the parent's size.
		final SpringLayout.Constraints pCons = layout.getConstraints(parent);
		if (lastCons != null)
		{
			pCons.setConstraint(SpringLayout.SOUTH, Spring.sum(Spring.constant(yPad), lastCons.getConstraint(SpringLayout.SOUTH)));
			pCons.setConstraint(SpringLayout.EAST, Spring.sum(Spring.constant(xPad), lastCons.getConstraint(SpringLayout.EAST)));
		}
	}
	
	/* Used by makeCompactGrid. */
	private static SpringLayout.Constraints getConstraintsForCell(int row, int col, Container parent, int cols)
	{
		return ((SpringLayout) parent.getLayout()).getConstraints(parent.getComponent((row * cols) + col));
	}
	
	/**
	 * Aligns the first <code>rows</code> * <code>cols</code> components of <code>parent</code> in a grid. Each component in a column is as wide as the maximum preferred width of the components in that column; height is similarly determined for each row. The parent is made just big enough to fit
	 * them all.
	 * @param parent
	 * @param rows number of rows
	 * @param cols number of columns
	 * @param initialX x location to start the grid at
	 * @param initialY y location to start the grid at
	 * @param xPad x padding between cells
	 * @param yPad y padding between cells
	 */
	public static void makeCompactGrid(Container parent, int rows, int cols, int initialX, int initialY, int xPad, int yPad)
	{
		SpringLayout layout;
		try
		{
			layout = (SpringLayout) parent.getLayout();
		}
		catch (ClassCastException exc)
		{
			System.err.println("The first argument to makeCompactGrid must use SpringLayout.");
			return;
		}
		
		// Align all cells in each column and make them the same width.
		Spring x = Spring.constant(initialX);
		for (int c = 0; c < cols; c++)
		{
			Spring width = Spring.constant(0);
			for (int r = 0; r < rows; r++)
			{
				width = Spring.max(width, getConstraintsForCell(r, c, parent, cols).getWidth());
			}
			for (int r = 0; r < rows; r++)
			{
				final SpringLayout.Constraints constraints = getConstraintsForCell(r, c, parent, cols);
				constraints.setX(x);
				constraints.setWidth(width);
			}
			x = Spring.sum(x, Spring.sum(width, Spring.constant(xPad)));
		}
		
		// Align all cells in each row and make them the same height.
		Spring y = Spring.constant(initialY);
		for (int r = 0; r < rows; r++)
		{
			Spring height = Spring.constant(0);
			for (int c = 0; c < cols; c++)
			{
				height = Spring.max(height, getConstraintsForCell(r, c, parent, cols).getHeight());
			}
			for (int c = 0; c < cols; c++)
			{
				final SpringLayout.Constraints constraints = getConstraintsForCell(r, c, parent, cols);
				constraints.setY(y);
				constraints.setHeight(height);
			}
			y = Spring.sum(y, Spring.sum(height, Spring.constant(yPad)));
		}
		
		// Set the parent's size.
		final SpringLayout.Constraints pCons = layout.getConstraints(parent);
		pCons.setConstraint(SpringLayout.SOUTH, y);
		pCons.setConstraint(SpringLayout.EAST, x);
	}
}
