package de.ugoe.cs.swe.bnftools.ui.formatter;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IContainer;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.ui.PlatformUI;
import org.eclipse.xtext.parsetree.NodeAdapter;
import org.eclipse.xtext.parsetree.NodeUtil;
import org.eclipse.xtext.ui.editor.XtextEditor;
import org.eclipse.xtext.ui.editor.model.XtextDocument;
import org.osgi.framework.Bundle;

import de.ugoe.cs.swe.bnftools.utils.RootEObjectFinder;

public class HtmlFormatterHandler extends AbstractHandler {

	public Object execute(ExecutionEvent event) throws ExecutionException {
		XtextEditor editor = (XtextEditor) PlatformUI.getWorkbench()
				.getActiveWorkbenchWindow().getActivePage().getActiveEditor();

		// TODO: better error handling
		if (!(editor.getDocument() instanceof XtextDocument)) {
			return null;
		}

		XtextDocument doc = (XtextDocument) editor.getDocument();
		IContainer parent = editor.getResource().getParent();

		EObject root = doc.readOnly(new RootEObjectFinder());
		NodeAdapter rootNode = NodeUtil.getNodeAdapter(root);

		FormatterConfig config = new FormatterConfig();
		EbnfHtmlFormatterVisitor visitor = new EbnfHtmlFormatterVisitor(
				rootNode.getParserNode().getElement(), config);

		visitor.accept();

		Bundle bundle = Platform.getBundle("de.ugoe.cs.swe.bnftools.ebnf.ui");
		String bundlePath = bundle.getLocation().replaceAll("reference:file:","");
		String resourcePath = bundle.getResource("resources/html-header.html").getPath(); 
		String result = "";
		try {
			result = readFileAsString(bundlePath + resourcePath);
		} catch (IOException e) {
		}
		result = result + visitor.getBuf();
		
//		System.out.println(visitor.getBuf());
		
		String filename = editor.getResource().getLocation().toPortableString().toString() + ".html";
//		System.out.println(filename);
		writeFile(result, filename);
		
		return null;
	}

	private String readFileAsString(String filePath) throws java.io.IOException{
	    byte[] buffer = new byte[(int) new File(filePath).length()];
	    FileInputStream f = new FileInputStream(filePath);
	    f.read(buffer);
	    return new String(buffer);
	}
	
	private void writeFile(String str, String filename) {
		try {
			FileWriter fstream = new FileWriter(filename);
			BufferedWriter out = new BufferedWriter(fstream);
			out.write(str);
			out.close();
		} catch (Exception e) {// Catch exception if any
			System.err.println("Error: " + e.getMessage());
		}
	}

}