package org.simantics.modeling.ui.actions.style;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;
import javax.swing.ListSelectionModel;
import javax.swing.SwingConstants;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

@SuppressWarnings({"rawtypes", "unchecked"})
public class FontChooser extends JPanel {

    private static final long serialVersionUID = -53650261362110193L;

    private static Font DEFAULT_FONT = new Font(Messages.FontChooser_DefaultFont, Font.PLAIN, 16);

    private String sampleText;
    private JLabel text;

    private JList fontList;
    private JComboBox sizeComboBox;
    private JCheckBox boldCheckBox;
    private JCheckBox italicCheckBox;

    private String fonts[];

    private Font originalFont;
    private Font font;

    public FontChooser(String sampleText) {
        super();

        this.sampleText = sampleText;
        JPanel textPanel = new JPanel();
        text = new JLabel(sampleText, SwingConstants.CENTER);
        text.setVerticalAlignment(SwingConstants.CENTER);
        this.setLayout(new BorderLayout());
        textPanel.setBorder(BorderFactory.createLineBorder(Color.darkGray));
        textPanel.add(text);
        textPanel.setMinimumSize(new Dimension(100, 100));
        textPanel.setPreferredSize(new Dimension(200, 100));
        this.add(textPanel,BorderLayout.NORTH);

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        String[] ff = ge.getAvailableFontFamilyNames();
        fonts = new String[ff.length + 1];
        fonts[0] = Messages.FontChooser_KeepCurrentFont;
        System.arraycopy(ff, 0, fonts, 1, ff.length);

        fontList = new JList(fonts);
        fontList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        fontList.setLayoutOrientation(JList.VERTICAL);
        fontList.setVisibleRowCount(-1);

        fontList.addListSelectionListener(new ListSelectionListener() {

            @Override
            public void valueChanged(ListSelectionEvent e) {
                if (!e.getValueIsAdjusting()) {
                    int index = fontList.getSelectedIndex();
                    if (index != -1) {
                        selectFont(index);
                    }
                }
            }
        });

        fontList.setCellRenderer(new FontListRenderer());


        JScrollPane listScrollPane = new JScrollPane(fontList);
        listScrollPane.setPreferredSize(new Dimension(400, 200));
        this.add(listScrollPane, BorderLayout.CENTER);

        JPanel controlPanel = new JPanel();
        this.add(controlPanel,BorderLayout.SOUTH);

        ActionListener listener = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                selectFont(fontList.getSelectedIndex());
            }
        };

        // FIXME: hack
        Integer[] sizes = {4, 6, 7, 8, 9, 10, 11, 12, 14, 18, 20, 22, 24, 36, 40, 48, 56, 64, 72, 144};
        sizeComboBox = new JComboBox(sizes);
        sizeComboBox.addActionListener(listener);
        sizeComboBox.setSelectedIndex(7);
        controlPanel.add(new JLabel(Messages.FontChooser_Size));
        controlPanel.add(sizeComboBox);

        boldCheckBox = new JCheckBox(Messages.FontChooser_Bold);
        boldCheckBox.addActionListener(listener);
        controlPanel.add(boldCheckBox);

        italicCheckBox = new JCheckBox(Messages.FontChooser_Italic);
        italicCheckBox.addActionListener(listener);
        controlPanel.add(italicCheckBox);

        fontList.setSelectedIndex(0);
    }

    private void selectFont(int index) {
        if (index < 0)
            return;
        String name = fonts[index];
        Integer size = (Integer)sizeComboBox.getSelectedItem();
        int style = Font.PLAIN; // plain == 0
        if (boldCheckBox.isSelected())
            style = style | Font.BOLD;
        if (italicCheckBox.isSelected())
            style = style | Font.ITALIC;
        Font original = originalFont != null ? originalFont : DEFAULT_FONT;
        // Index 0 is reserved for keeping the original font (family)
        Font f = index == 0 ? original.deriveFont(style, size) : new Font(name, style, size);
        font = !f.equals(original) ? f : null;
        text.setText(sampleText);
        text.setFont(f);
    }

    public Font getFont() {
        return font;
    }

    public void setCurrentFont(Font font) {
        int index = -1;
        for (int i = 0; i < fonts.length; i++) {
            if (fonts[i].equals(font.getFamily())) {
                index = i;
                break;
            }
        }
        if (index == -1)
            return;
        fontList.setSelectedIndex(index);
        fontList.scrollRectToVisible(fontList.getCellBounds(index, index));
        boldCheckBox.setSelected((font.getStyle() & Font.BOLD) > 0);
        italicCheckBox.setSelected((font.getStyle() & Font.ITALIC) > 0);
        sizeComboBox.setSelectedItem(font.getSize());
        this.originalFont = font;
        selectFont(index);
    }

    public class FontListRenderer extends JLabel implements ListCellRenderer {

        private static final long serialVersionUID = 1237633327794383545L;

        public FontListRenderer() {
            setOpaque(true);
            setHorizontalAlignment(LEFT);
            setVerticalAlignment(CENTER);
        };

        @Override
        public Component getListCellRendererComponent(JList list, Object value,
                int index, boolean isSelected, boolean cellHasFocus) {
            if (isSelected) {
                setBackground(list.getSelectionBackground());
                setForeground(list.getSelectionForeground());
            } else {
                setBackground(list.getBackground());
                setForeground(list.getForeground());
            }

            String text = (String) value;
            setText(text);

            // Not really that helpful when one can't even read the name of
            // some fonts with the sample text. Also keeps the list visually cleaner.
            // Thus removed.
            //setFont(index > 0 ? new Font(text,Font.PLAIN,16) : DEFAULT_FONT);

            return this;
        }
    }
}