/*
 * 01/13/2009
 *
 * DemoRootPane.java - Root pane for the demo applet and standalone application.
 *
 * This library is distributed under a modified BSD license.  See the included
 * LICENSE.md file for details.
 */
package istlab.TestRSyntaxTA.demo;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.util.Arrays;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JEditorPane;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.JRootPane;
import javax.swing.SwingUtilities;
import javax.swing.ToolTipManager;
import javax.swing.UIManager;
import javax.swing.text.TextAction;

import org.fife.ui.autocomplete.AutoCompletion;
import org.fife.ui.autocomplete.BasicCompletion;
import org.fife.ui.autocomplete.CompletionCellRenderer;
import org.fife.ui.autocomplete.CompletionProvider;
import org.fife.ui.autocomplete.DefaultCompletionProvider;
import org.fife.ui.autocomplete.FunctionCompletion;
import org.fife.ui.autocomplete.LanguageAwareCompletionProvider;
import org.fife.ui.autocomplete.ParameterizedCompletion;
import org.fife.ui.autocomplete.ShorthandCompletion;
import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea;
import org.fife.ui.rsyntaxtextarea.SyntaxConstants;
import org.fife.ui.rtextarea.RTextScrollPane;
import org.fife.ui.rtextarea.ToolTipSupplier;


/**
 * The root pane for the demo application.  This is all code shared between
 * the applet and standalone versions of the demo.
 *
 * @author Robert Futrell
 * @version 1.0
 */
class DemoRootPane extends JRootPane {

	private RSyntaxTextArea textArea;
	private AutoCompletion ac;
	private JCheckBoxMenuItem cellRenderingItem;
	private JCheckBoxMenuItem alternateRowColorsItem;
	private JCheckBoxMenuItem showDescWindowItem;
	private JCheckBoxMenuItem paramAssistanceItem;
	private JEditorPane ep;

	private static final Color ALT_BG_COLOR = new Color(0xf0f0f0);


	/**
	 * Constructor.
	 */
	DemoRootPane() {
		this(null);
	}


	/**
	 * Constructor.
	 *
	 * @param provider The completion provider for the editor to use.
	 */
	DemoRootPane(CompletionProvider provider) {

		JPanel contentPane = new JPanel(new BorderLayout());

		ep = new JEditorPane("text/html", null);
		updateEditorPane(); // Nimbus doesn't always clean up after itself.
		contentPane.add(ep, BorderLayout.NORTH);

		textArea = new RSyntaxTextArea(25, 40);
		textArea.setSyntaxEditingStyle(SyntaxConstants.SYNTAX_STYLE_C);

		if (provider==null) {
			provider = createCompletionProvider();
		}

		// Install auto-completion onto our text area.
		ac = new AutoCompletion(provider);
		ac.setListCellRenderer(new CCellRenderer());
		ac.setShowDescWindow(true);
		ac.setParameterAssistanceEnabled(true);

		ac.setAutoCompleteEnabled(true);
		ac.setAutoActivationEnabled(true);
		ac.setAutoCompleteSingleChoices(true);
		ac.setAutoActivationDelay(800);

		ac.install(textArea);
		contentPane.add(new RTextScrollPane(textArea, true));

		try {
			textArea.read(new StringReader("int main() {\n  printf(\"Hello world\\n\");\n}\n"), null);
		} catch (IOException ioe) {
			ioe.printStackTrace();
		}

		textArea.setToolTipSupplier((ToolTipSupplier)provider);
		ToolTipManager.sharedInstance().registerComponent(textArea);

		setJMenuBar(createMenuBar());

		// Get ready to go.
		setContentPane(contentPane);

		// Put the focus into the text area, not the "label" JEditorPane.
		SwingUtilities.invokeLater(() -> textArea.requestFocusInWindow());

	}


	/**
	 * Returns the provider to use when editing code.
	 *
	 * @return The provider.
	 * @see #createCommentCompletionProvider()
	 * @see #createStringCompletionProvider()
	 */
	private CompletionProvider createCodeCompletionProvider() {

		// Add completions for the C standard library.
		DefaultCompletionProvider cp = new DefaultCompletionProvider();

		cp.setAutoActivationRules(true, ".");

		// First try loading resource (running from demo jar), then try
		// accessing file (debugging in Eclipse).
		ClassLoader cl = getClass().getClassLoader();
		InputStream in = cl.getResourceAsStream("c.xml");
		try {
			if (in!=null) {
				cp.loadFromXML(in);
				in.close();
			}
			else {
				cp.loadFromXML(new File("c.xml"));
			}
		} catch (IOException ioe) {
			ioe.printStackTrace();
		}

		// Add some handy shorthand completions.
		cp.addCompletion(new ShorthandCompletion(cp, "main",
							"int main(int argc, char **argv)"));

		// Add a parameterized completion with a ton of parameters (see #67)
		FunctionCompletion functionCompletionWithLotsOfParameters = new FunctionCompletion(cp, "long", "int");
		functionCompletionWithLotsOfParameters.setParams(Arrays.asList(
			new ParameterizedCompletion.Parameter("int", "intVal"),
			new ParameterizedCompletion.Parameter("float", "floatVal"),
			new ParameterizedCompletion.Parameter("string", "stringVal"),
			new ParameterizedCompletion.Parameter("int", "otherVal1"),
			new ParameterizedCompletion.Parameter("int", "otherVal2"),
			new ParameterizedCompletion.Parameter("int", "otherVal3"),
			new ParameterizedCompletion.Parameter("int", "otherVal4"),
			new ParameterizedCompletion.Parameter("int", "otherVal5"),
			new ParameterizedCompletion.Parameter("int", "otherVal6"),
			new ParameterizedCompletion.Parameter("int", "otherVal7"),
			new ParameterizedCompletion.Parameter("int", "otherVal8"),
			new ParameterizedCompletion.Parameter("int", "otherVal9"),
			new ParameterizedCompletion.Parameter("int", "otherVal9"),
			new ParameterizedCompletion.Parameter("int", "otherVal10"),
			new ParameterizedCompletion.Parameter("int", "otherVal11"),
			new ParameterizedCompletion.Parameter("int", "otherVal12"),
			new ParameterizedCompletion.Parameter("int", "otherVal13"),
			new ParameterizedCompletion.Parameter("int", "otherVal14"),
			new ParameterizedCompletion.Parameter("int", "otherVal15"),
			new ParameterizedCompletion.Parameter("int", "otherVal16"),
			new ParameterizedCompletion.Parameter("int", "otherVal17"),
			new ParameterizedCompletion.Parameter("int", "otherVal18"),
			new ParameterizedCompletion.Parameter("int", "otherVal19"),
			new ParameterizedCompletion.Parameter("int", "otherVal20")
		));
		cp.addCompletion(functionCompletionWithLotsOfParameters);
		return cp;

	}


	/**
	 * Returns the provider to use when in a comment.
	 *
	 * @return The provider.
	 * @see #createCodeCompletionProvider()
	 * @see #createStringCompletionProvider()
	 */
	private CompletionProvider createCommentCompletionProvider() {
		DefaultCompletionProvider cp = new DefaultCompletionProvider();
		cp.addCompletion(new BasicCompletion(cp, "TODO:", "A to-do reminder"));
		cp.addCompletion(new BasicCompletion(cp, "FIXME:", "A bug that needs to be fixed"));
		return cp;
	}


	/**
	 * Creates the completion provider for a C editor.  This provider can be
	 * shared among multiple editors.
	 *
	 * @return The provider.
	 */
	private CompletionProvider createCompletionProvider() {

		// Create the provider used when typing code.
		CompletionProvider codeCP = createCodeCompletionProvider();

		// The provider used when typing a string.
		CompletionProvider stringCP = createStringCompletionProvider();

		// The provider used when typing a comment.
		CompletionProvider commentCP = createCommentCompletionProvider();

		// Create the "parent" completion provider.
		LanguageAwareCompletionProvider provider = new
								LanguageAwareCompletionProvider(codeCP);
		provider.setStringCompletionProvider(stringCP);
		provider.setCommentCompletionProvider(commentCP);

		return provider;

	}


	/**
	 * Returns the menu bar for the demo application.
	 *
	 * @return The menu bar.
	 */
	private JMenuBar createMenuBar() {

		JMenuBar mb = new JMenuBar();

		JMenu menu = new JMenu("File");
		Action newAction = new TextAction("New") {
			@Override
			public void actionPerformed(ActionEvent e) {
				AutoCompleteDemoApp app2 = new AutoCompleteDemoApp(
												ac.getCompletionProvider());
				app2.setVisible(true);
			}
		};
		JMenuItem item = new JMenuItem(newAction);
		menu.add(item);
		mb.add(menu);

		menu = new JMenu("View");
		Action renderAction = new FancyCellRenderingAction();
		cellRenderingItem = new JCheckBoxMenuItem(renderAction);
		cellRenderingItem.setSelected(true);
		menu.add(cellRenderingItem);
		Action alternateRowColorsAction = new AlternateRowColorsAction();
		alternateRowColorsItem = new JCheckBoxMenuItem(alternateRowColorsAction);
		menu.add(alternateRowColorsItem);
		Action descWindowAction = new ShowDescWindowAction();
		showDescWindowItem = new JCheckBoxMenuItem(descWindowAction);
		showDescWindowItem.setSelected(true);
		menu.add(showDescWindowItem);
		Action paramAssistanceAction = new ParameterAssistanceAction();
		paramAssistanceItem = new JCheckBoxMenuItem(paramAssistanceAction);
		paramAssistanceItem.setSelected(true);
		menu.add(paramAssistanceItem);
		mb.add(menu);

		ButtonGroup bg = new ButtonGroup();
		menu = new JMenu("LookAndFeel");
		Action lafAction = new LafAction("System", UIManager.getSystemLookAndFeelClassName());
		JRadioButtonMenuItem rbmi = new JRadioButtonMenuItem(lafAction);
		rbmi.setSelected(true);
		menu.add(rbmi);
		bg.add(rbmi);
		lafAction = new LafAction("Motif", "com.sun.java.swing.plaf.motif.MotifLookAndFeel");
		rbmi = new JRadioButtonMenuItem(lafAction);
		menu.add(rbmi);
		bg.add(rbmi);
		lafAction = new LafAction("Ocean", "javax.swing.plaf.metal.MetalLookAndFeel");
		rbmi = new JRadioButtonMenuItem(lafAction);
		menu.add(rbmi);
		bg.add(rbmi);
		lafAction = new LafAction("Nimbus", "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
		rbmi = new JRadioButtonMenuItem(lafAction);
		menu.add(rbmi);
		bg.add(rbmi);
		mb.add(menu);

		return mb;

	}


	/**
	 * Returns the completion provider to use when the caret is in a string.
	 *
	 * @return The provider.
	 * @see #createCodeCompletionProvider()
	 * @see #createCommentCompletionProvider()
	 */
	private CompletionProvider createStringCompletionProvider() {
		DefaultCompletionProvider cp = new DefaultCompletionProvider();
		cp.addCompletion(new BasicCompletion(cp, "%c", "char", "Prints a character"));
		cp.addCompletion(new BasicCompletion(cp, "%i", "signed int", "Prints a signed integer"));
		cp.addCompletion(new BasicCompletion(cp, "%f", "float", "Prints a float"));
		cp.addCompletion(new BasicCompletion(cp, "%s", "string", "Prints a string"));
		cp.addCompletion(new BasicCompletion(cp, "%u", "unsigned int", "Prints an unsigned integer"));
		cp.addCompletion(new BasicCompletion(cp, "\\n", "Newline", "Prints a newline"));
		return cp;
	}


	/**
	 * Focuses the text area.
	 */
	public void focusEditor() {
		textArea.requestFocusInWindow();
	}


	/**
	 * Updates the font used in the HTML, as well as the background color, of
	 * the "label" editor pane.  The font would always have to be done (since
	 * HTMLEditorKit doesn't use the editor pane's font by default), but the
	 * background only has to be modified because Nimbus doesn't clean up the
	 * colors it installs after itself.
	 */
	private void updateEditorPane() {
		Font f = UIManager.getFont("Label.font");
		String fontTag = "<body style=\"font-family: " + f.getFamily() +
					"; font-size: " + f.getSize() + "pt; \">";
		String text = "<html>" + fontTag + "" +
			"The text area below provides simple code completion for the C " +
			"programming language as you type. Simply type <b>Ctrl+Space</b> " +
			"at any time to see a list of completion choices (function names, "+
			"for example). If there is only one possible completion, it will " +
			"be automatically inserted.<p>" +
			"Also, completions are context-sensitive.  If you type " +
			"Ctrl+Space in a comment or in the middle of a string, you will " +
			"get different completion choices than if you are in code.";
		ep.setText(text);
		ep.setBorder(BorderFactory.createEmptyBorder(5,5,10,5));
		ep.setEditable(false);
		ep.setBackground(UIManager.getColor("Panel.background"));
	}


	/**
	 * Toggles whether row backgrounds use alternate colors.
	 */
	private class AlternateRowColorsAction extends AbstractAction {

		AlternateRowColorsAction() {
			putValue(NAME, "Alternate Row Colors in completion list");
		}

		@Override
		public void actionPerformed(ActionEvent e) {
			boolean alternate = alternateRowColorsItem.isSelected();
			CompletionCellRenderer.setAlternateBackground(
					alternate ? ALT_BG_COLOR: null);
		}

	}


	/**
	 * Toggles whether the completion window uses "fancy" rendering.
	 */
	private class FancyCellRenderingAction extends AbstractAction {

		FancyCellRenderingAction() {
			putValue(NAME, "Fancy Cell Rendering");
		}

		@Override
		public void actionPerformed(ActionEvent e) {
			boolean fancy = cellRenderingItem.isSelected();
			ac.setListCellRenderer(fancy ? new CCellRenderer() : null);
		}

	}


	/**
	 * Sets a new look and feel.
	 */
	private class LafAction extends AbstractAction {

		private String laf;

		LafAction(String name, String laf) {
			putValue(NAME, name);
			this.laf = laf;
		}

		@Override
		public void actionPerformed(ActionEvent e) {
			try {
				UIManager.setLookAndFeel(laf);
			} catch (Exception ex) {
				JOptionPane.showMessageDialog(DemoRootPane.this,
					"Error setting LookAndFeel", "Error",
					JOptionPane.ERROR_MESSAGE);
				return;
			}
			Component parent = SwingUtilities.getRoot(DemoRootPane.this);
			SwingUtilities.updateComponentTreeUI(parent);
			updateEditorPane();
		}

	}


	/**
	 * Toggles whether parameter assistance is enabled.
	 */
	private class ParameterAssistanceAction extends AbstractAction {

		ParameterAssistanceAction() {
			putValue(NAME, "Function Parameter Assistance");
		}

		@Override
		public void actionPerformed(ActionEvent e) {
			boolean enabled = paramAssistanceItem.isSelected();
			ac.setParameterAssistanceEnabled(enabled);
		}

	}


	/**
	 * Toggles whether the description window is visible.
	 */
	private class ShowDescWindowAction extends AbstractAction {

		ShowDescWindowAction() {
			putValue(NAME, "Show Description Window");
		}

		@Override
		public void actionPerformed(ActionEvent e) {
			boolean show = showDescWindowItem.isSelected();
			ac.setShowDescWindow(show);
		}

	}


}