package pyUML.refactoring;

import java.io.IOException;
import java.net.URLDecoder;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.dialogs.MessageDialog;
import org.python.copiedfromeclipsesrc.JDTNotAvailableException;
import org.python.pydev.core.IPythonNature;
import org.python.pydev.core.MisconfigurationException;
import org.python.pydev.core.PythonNatureWithoutProjectException;
import org.python.pydev.core.REF;
import org.python.pydev.editor.codecompletion.shell.AbstractShell;
import org.python.pydev.editor.refactoring.AbstractPyRefactoring;
import org.python.pydev.editor.refactoring.IPyRefactoring;
import org.python.pydev.plugin.nature.PythonNature;


import pyUML.exceptions.PyUMLSynchronizeCodeException;
import pyUML.pythonTree.PythonTreeFile;


/**
 * Helper class to use the Python pyUML.refactoring functionality
 * provided by "Bicycle Repair Man", written in Python
 * as used by PyDev 
 */
public class BicycleRefactoring {
	
	
	/**
	 * This is the generic refactor command using bicycle pyUML.refactoring. 
	 * Is is used by specializes pyUML.refactoring methods
	 * 
	 * @param refactorCommand - the String with the pyUML.refactoring to be done 
	 * @param conditionalMethod - the name of the pyUML.refactoring method
	 * @param project - the current project
	 * @return true on success, false on error
	 */
	public static boolean doGenericBikeRefactoring(String refactorCommand, String conditionalMethod, IProject project) throws PyUMLSynchronizeCodeException{
        IPyRefactoring pyRefactoring = AbstractPyRefactoring.getPyRefactoring();
        IPythonNature pythonNature = PythonNature.getPythonNature(project);
        try {
        	 if ((Boolean) REF.invoke(pyRefactoring, conditionalMethod, new Object[0])) {
    			AbstractShell pytonShell = AbstractShell.getServerShell(pythonNature, AbstractShell.OTHERS_SHELL);
    			String output = "";
        		try{
	 		        pytonShell.changePythonPath(pythonNature.getPythonPathNature().getCompleteProjectPythonPath(null, null)); //default
		            pytonShell.write(refactorCommand);
		            output = URLDecoder.decode(pytonShell.read((IProgressMonitor)null), "UTF-8");
    	        } catch (Exception e) {
    	        	output = "ERROR: "+e.getClass().getName()+"\n";
    	            e.printStackTrace();
    	            pytonShell.restartShell();
    	        }    	        
		        if (output.startsWith("ERROR:")) {
		        	String errmsg = output.substring(0, output.indexOf('\n'));
		        	pytonShell.restartShell();
		        	MessageDialog.openError(null, "Error on pyUML.refactoring using Bike!" , 
		        			"There was a pyUML.refactoring error using the Bicycle Repair Man Browser\n" +
		        			"The command was: "+refactorCommand
		        			+"\nThe error was: "+errmsg);
		        	return false;
		        }
        	 } else {
        		 throw new PyUMLSynchronizeCodeException("Error on pyUML.refactoring using Bike!\n\n" +
        		 		"pyRefactoring is not available!");
        	 }
        }catch (CoreException e) {
        	throw new PyUMLSynchronizeCodeException("CoreException on pyUML.refactoring using Bike!\n\n" +
	 		e.getMessage());
        }catch (IOException e) {
        	throw new PyUMLSynchronizeCodeException("IOException on pyUML.refactoring using Bike!\n\n" +
	 		e.getMessage());        		
        } catch (JDTNotAvailableException e) {
        	throw new PyUMLSynchronizeCodeException("JDTNotAvailableException on pyUML.refactoring using Bike!\n\n" +
        	 		e.getMessage());
		} catch (MisconfigurationException e) {
			throw new PyUMLSynchronizeCodeException("PyUMLSynchronizeCodeException on pyUML.refactoring using Bike!\n\n" +
			 		e.getMessage());
		} catch (PythonNatureWithoutProjectException e) {
			throw new PyUMLSynchronizeCodeException("PythonNatureWithoutProjectException on pyUML.refactoring using Bike!\n\n" +
			 		e.getMessage());
		}

         return true;
	}
	
	
	/**
	 * DO a 'rename' Refactoring. This is for class / method renaming 
	 * 
	 * @param filePath the Path of the file to edit 
	 * 	(other files may be affected as well)
	 *  (use File.toOSString() to get this Path string)
	 * @param newName the new Name of the object
	 * @param line the line of the object
	 * @param col the column of the object
	 * @param project the current project
	 * @return true on success, false otherwise.
	 */
	public static boolean doRenameObject(PythonTreeFile file, String newName, int line, int col, IProject project) throws PyUMLSynchronizeCodeException{
		
		String filePath = file.getFilePath().toOSString();
		
		// make sure the line to change is not the last line in file
		// -> then bike will fail!
		if (line == file.getFileContent().split("\n").length ) {
			// insert line and start again
			FileRefactoring.appendToFile(file, " ");
			file.getRoot().setChangedFileLine(filePath+":"+line);
			return true;
		}
		
		
		String command = "@@BIKE";
		command+=        "renameByCoordinates";
		command+=        "|"+filePath;
		command+=        "|"+line;
		command+=        "|"+(col-1);
		command+=        "|"+newName;
		command+=        "END@@";
		
		String conditionalMethod = "canRename";
		
		boolean success = doGenericBikeRefactoring(command, conditionalMethod, project);
		file.updateFileInEclipse();
		return success;
	}
}