/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 *******************************************************************************/
package org.eclipse.dltk.python.internal.debug.ui.console;


import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.dltk.debug.ui.DLTKDebugUIPlugin;
import org.eclipse.dltk.internal.ui.editor.EditorUtility;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.console.IHyperlink;
import org.eclipse.ui.console.TextConsole;
import org.eclipse.ui.texteditor.IDocumentProvider;
import org.eclipse.ui.texteditor.ITextEditor;

import com.ibm.icu.text.MessageFormat;

/**
 * A hyperlink from a stack trace line of the form "*(*.java:*)"
 */
public class PythonFileHyperlink implements IHyperlink {

	private TextConsole fConsole;

	/**
	 * Constructor for PythonFileHyperlink.
	 */
	public PythonFileHyperlink(TextConsole console) {
		fConsole = console;
	}

	@Override
	public void linkEntered() {
	}

	@Override
	public void linkExited() {
	}

	@Override
	public void linkActivated() {
		try {
			String fileName;
            int lineNumber;
            try {
                String linkText = getLinkText();
                fileName = getFileName(linkText);
                lineNumber = getLineNumber(linkText);
            } catch (CoreException e1) {
                ErrorDialog.openError(DLTKDebugUIPlugin.getActiveWorkbenchShell(), ConsoleMessages.PythonFileHyperlink_Error, ConsoleMessages.PythonFileHyperlink_Error, e1.getStatus());
                return;
            }

			// documents start at 0
			if (lineNumber > 0) {
				lineNumber--;
			}
			Object sourceElement = getSourceModule(fileName);
			if (sourceElement != null) {
				IEditorPart part = EditorUtility.openInEditor(sourceElement);
				IEditorPart editorPart = EditorUtility
						.openInEditor(sourceElement);
				if (editorPart instanceof ITextEditor && lineNumber >= 0) {
					ITextEditor textEditor = (ITextEditor) editorPart;
					IDocumentProvider provider = textEditor
							.getDocumentProvider();
					IEditorInput input = part.getEditorInput();
					provider.connect(input);
					IDocument document = provider.getDocument(input);
					try {
						IRegion line = document.getLineInformation(lineNumber);
						textEditor.selectAndReveal(line.getOffset(), line
								.getLength());
					} catch (BadLocationException e) {

					}
					provider.disconnect(input);
				}
				return;
			}
			// did not find source
			MessageDialog.openInformation(DLTKDebugUIPlugin.getActiveWorkbenchShell(),
					ConsoleMessages.PythonFileHyperlink_Information_1,
					MessageFormat.format(ConsoleMessages.PythonFileHyperlink_Source_not_found_for__0__2, fileName));
		} catch (CoreException e) {
			DLTKDebugUIPlugin.errorDialog(ConsoleMessages.PythonFileHyperlink_An_exception_occurred_while_following_link__3, e);
			return;
		}
	}

	protected Object getSourceModule(String fileName) throws CoreException {
		IFile f = ResourcesPlugin.getWorkspace().getRoot().getFileForLocation(new Path(fileName));
		return f;
	}

	/**
	 * Returns the fully qualified name of the type to open
	 *
	 * @return fully qualified type name
	 * @exception CoreException if unable to parse the type name
	 */
	protected String getFileName(String linkText) throws CoreException {
        Pattern p = Pattern.compile("File\\s*\"(.*)\"");
        Matcher m = p.matcher(linkText);
        if (m.find()) {
        	String name = m.group(1);
        	return name;
        }
        IStatus status = new Status(IStatus.ERROR, DLTKDebugUIPlugin.getUniqueIdentifier(), 0, ConsoleMessages.PythonFileHyperlink_Unable_to_parse_type_name_from_hyperlink__5, null);
        throw new CoreException(status);
    }

	/**
	 * Returns the line number associated with the stack trace or -1 if none.
	 *
	 * @exception CoreException if unable to parse the number
	 */
	protected int getLineNumber(String linkText) throws CoreException {
		Pattern p = Pattern.compile("line (\\d*)");
        Matcher m = p.matcher(linkText);
        if (m.find()) {
        	String lineText = m.group(1);
        	try {
				return Integer.parseInt(lineText);
			} catch (NumberFormatException e) {
				IStatus status = new Status(IStatus.ERROR, DLTKDebugUIPlugin.getUniqueIdentifier(), 0, ConsoleMessages.PythonFileHyperlink_Unable_to_parse_line_number_from_hyperlink__6, e);
				throw new CoreException(status);
			}
        }
		IStatus status = new Status(IStatus.ERROR, DLTKDebugUIPlugin.getUniqueIdentifier(), 0, ConsoleMessages.PythonFileHyperlink_Unable_to_parse_line_number_from_hyperlink__7, null);
		throw new CoreException(status);
	}

	/**
	 * Returns the console this link is contained in.
	 *
	 * @return console
	 */
	protected TextConsole getConsole() {
		return fConsole;
	}

	/**
	 * Returns this link's text
	 *
	 * @exception CoreException if unable to retrieve the text
	 */
	protected String getLinkText() throws CoreException {
	    try {
            IDocument document = getConsole().getDocument();
	        IRegion region = getConsole().getRegion(this);
            int regionOffset = region.getOffset();

	        int lineNumber = document.getLineOfOffset(regionOffset);
	        IRegion lineInformation = document.getLineInformation(lineNumber);
            int lineOffset = lineInformation.getOffset();
	        String line = document.get(lineOffset, lineInformation.getLength());

            //int regionOffsetInLine = regionOffset - lineOffset;

            //int linkEnd = line.indexOf(')', regionOffsetInLine);
            //int linkStart = line.lastIndexOf(' ', regionOffsetInLine);

            //return line.substring(linkStart==-1?0:linkStart+1,linkEnd+1);
            return line.trim();
		} catch (BadLocationException e) {
			IStatus status = new Status(IStatus.ERROR, DLTKDebugUIPlugin.getUniqueIdentifier(), 0, ConsoleMessages.PythonFileHyperlink_Unable_to_retrieve_hyperlink_text__8, e);
			throw new CoreException(status);
		}
	}

}