package com.onaro.util.jfc.tables;

import java.awt.Component;
import java.awt.Graphics;

import javax.swing.Icon;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.table.JTableHeader;

import com.onaro.util.jfc.Resources;

/**
 * A cell renderer for painting column headers with an optional arrow that
 * indicated the sorting order. It extends the {@link ResourceCellRenderer}
 * class to support rendering of {@link com.onaro.util.jfc.ResourceCommonProperties} objects.
 */
public class SortingHeaderRenderer extends ResourceCellRenderer {

    private static final long serialVersionUID = 1L;

	/**
     * Tells which column is th sorting column and in what order.
     */
    private SortingInfo sortingInfo;

    /**
     * Holds the arrow icon for the current cell. If null than now arrow will
     * be painted.
     */
    Icon icon;

    /**
     * Sets center alignment.
     *
     * @param sortable tells which column is th sorting column and in what order
     */
    public SortingHeaderRenderer(SortingInfo sortable) {
        this.sortingInfo = sortable;
        setHorizontalAlignment(JLabel.CENTER);
    }

    public SortingInfo getSortingInfo() {
        return sortingInfo;
    }

    public void setSortingInfo(SortingInfo sortingInfo) {
        this.sortingInfo = sortingInfo;
    }

    /**
     * Paint the label and than the icon (if needed to).
     *
     * @param g the graphic context
     */
    public void paint(Graphics g) {
        super.paint(g);
        if (icon != null)
            icon.paintIcon(this, g, getWidth() - icon.getIconWidth() - 2, getHeight() - icon.getIconHeight() - 2);
    }

    /**
     * When preparing the renderer, according the rendered column and the current
     * sorting, decide which arrow icon to use.
     *
     * @param table      the table
     * @param value      the value to render
     * @param isSelected true if the cell is selected
     * @param hasFocus   true if the cell has focus
     * @param row        the row number
     * @param column     the column number
     * @return this renderer
     */
    public Component getTableCellRendererComponent(JTable table, Object value,
                                                   boolean isSelected, boolean hasFocus, int row, int column) {
        if (value == null) value = " "; //$NON-NLS-1$

        super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

        /**
         * The following section was copied from JTableHeader
         */
        JTableHeader header = table.getTableHeader();
        if (header != null) {
            setForeground(header.getForeground());
            setBackground(header.getBackground());
            setFont(header.getFont());
        }


        if (table.convertColumnIndexToModel(column) == sortingInfo.getSortingColumn()) {
            if (sortingInfo.isAscendingSorting(table.convertColumnIndexToModel(column))) {
                icon = Resources.INSTANCE.getDescendingSortIcon();
            } else {
                icon = Resources.INSTANCE.getAscendingSortIcon();
            }
        } else {
            icon = null;
        }
        setBorder(UIManager.getBorder("TableHeader.cellBorder")); //$NON-NLS-1$

        /**
         * Use the following in order to use the background decoration provided
         * by the L&F.
         * super.setOpaque(false);
         * super.setBackground(null);
         */
        setHorizontalAlignment(JLabel.CENTER);
        setForeground(UIManager.getColor("TableHeader.foreground")); //$NON-NLS-1$
        setBackground(UIManager.getColor("TableHeader.background")); //$NON-NLS-1$

        return this;
    }
}