package parser;

import java.io.File;
import java.io.IOException;
import java.util.Map;

import org.eclipse.core.runtime.IPath;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.uml2.uml.Class;
import org.eclipse.uml2.uml.Element;
import org.eclipse.uml2.uml.Package;

import parser.pythonTree.PythonTreeClass;
import parser.pythonTree.PythonTreeNode;
import parser.pythonTree.PythonTreePackage;

public class CodeFromModelCreator {
	/**
	 * synchronizes the code with the model.
	 * if any python file is changed, false is returned
	 * to rebuild the tree and start from beginning
	 * 
	 * @param pythonNode
	 * @param umlElement
	 * @param xmiModelDict
	 * @return
	 */
	public static boolean synchronizeCodeFromModel(PythonTreeNode pythonNode, Element umlElement, Map<EObject, String> xmiModelDict) {
		for (Element modelElement:umlElement.getOwnedElements()) {
			if (modelElement instanceof Package) {
				Package modelPack = (Package) modelElement;
				PythonTreePackage pyPack = (PythonTreePackage) pythonNode;
				if (xmiModelDict.containsKey(modelPack)) {
					String xmi_id = xmiModelDict.get(modelPack);
					if (pythonNode.getRoot().getXmiPackDict().containsKey(xmi_id)) {
						PythonTreeNode node = pythonNode.getRoot().getXmiPackDict().get(xmi_id);
						if (pyPack.getChildPackages().contains(node)) {
							boolean startNew = synchronizeCodeFromModel(node, modelElement, xmiModelDict);
							if (startNew) return true;
						PythonTreePackage subPack = (PythonTreePackage) node;
						// TODO: umhaengen des Pakets an die richtige Stelle
						// im FS und im Python Tree
						}
					} else { 
						// look for python node with same name
						boolean packageFound = false;
						for (PythonTreePackage pySubPack : pyPack.getChildPackages()) {
							if (pySubPack.getName().equals(modelPack.getName())){
								// write xmi_id to code (only needed once)
								pySubPack.writeXmiID(xmi_id);
								packageFound=true;
								break;
							}
						}
						// if this package was not found, create it (recursively)!
						if (! packageFound) {
							// create package
							IPath newPackPath = pyPack.getPackageDir().append(modelPack.getName());
							File newPackDir = new File(newPackPath.toOSString());
							newPackDir.mkdir();
							File initPy = new File(newPackPath.append("__init__.py").toOSString());
							try{
								initPy.createNewFile();
							}
							catch (IOException e) {
								MessageDialog.openError(null, "IOException", "Error writing to file "+ initPy.getPath());
							}
							PythonTreePackage newPyPack = new PythonTreePackage(newPackPath, pyPack);
							newPyPack.writeXmiID(xmi_id);
							boolean startNew = synchronizeCodeFromModel(newPyPack, modelPack, xmiModelDict);
							if (startNew) return true;
						}
					}
				} else {
					MessageDialog.openError(null,"Error synchronizing","There was an inconsistency in the Python Package Tree");
					return true;
				}
			}
			
			else if (modelElement instanceof Class) {
				Class modelClass = (Class) modelElement;
				PythonTreePackage pyPack = (PythonTreePackage) pythonNode;
				if (xmiModelDict.containsKey(modelClass)) {
					String xmi_id = xmiModelDict.get(modelClass);
					if (pythonNode.getRoot().getXmiClassDict().containsKey(xmi_id)) {
						PythonTreeNode node = pythonNode.getRoot().getXmiClassDict().get(xmi_id);
						if (pyPack.getChildClasses().contains(node)) {
							boolean startNew = synchronizeCodeFromModel(node, modelElement, xmiModelDict);
							if (startNew) return true;
						PythonTreeClass subPack = (PythonTreeClass) node;
						// TODO: umhaengen der Klasse an die richtige Stelle
						}
					} else { 
						// look for python child class with same name
						// and write the right xmi_id
						boolean classFound = false;
						for (PythonTreeClass pySubClass : pyPack.getChildClasses()) {
							if (pySubClass.getName().equals(modelClass.getName())){
								// write xmi_id to code (only needed once)
								pySubClass.writeXmiID(xmi_id);
								classFound=true;
								return false;
							}
						}
						// if this class was not found, create it (recursively)!
					/*	if (! classFound) {
							// create package
							IPath newPackPath = treePack.getPackageDir().append(modelPack.getName());
							File newPackDir = new File(newPackPath.toOSString());
							newPackDir.mkdir();
							File initPy = new File(newPackPath.append("__init__.py").toOSString());
							try{
								initPy.createNewFile();
							}
							catch (IOException e) {
								MessageDialog.openError(null, "IOException", "Error writing to file "+ initPy.getPath());
							}
							PythonTreePackage newPyPack = new PythonTreePackage(newPackPath, treePack);
							newPyPack.writeXmiID(xmi_id);
							generateCodeFromModel(newPyPack, modelPack, xmiModelDict);
						}
			*/
					}
				}else {
					MessageDialog.openError(null,"Error synchronizing","There was an inconsistency in the Python Package Tree");
					return true;
				}
			}
		}
		return false;
	}
}