package com.sap.furcas.ide.projectwizard.test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.eclipse.emf.ecore.EObject;
import org.junit.BeforeClass;
import org.junit.Test;

import com.sap.furcas.ide.projectwizard.util.CodeGenerationException;
import com.sap.furcas.ide.projectwizard.util.ProjectInfo;
import com.sap.furcas.ide.projectwizard.util.SourceCodeFactory;
import com.sap.furcas.parsergenerator.TCSSyntaxContainerBean;
import com.sap.furcas.runtime.parser.ModelParsingResult;
import com.sap.furcas.runtime.parser.ParserFacade;
import com.sap.furcas.runtime.parser.exceptions.UnknownProductionRuleException;
import com.sap.furcas.runtime.parser.testbase.EMFParsingHelper;
import com.sap.furcas.runtime.parser.testbase.GeneratedParserBasedTest;
import com.sap.furcas.runtime.parser.testbase.GeneratedParserTestConfiguration;

/**
 * Simple Test for the .tcs file generated by the projectwizard.
 * Will make sure we notice when our auto-generated syntax definition gets outdated.
 */
public class ProjectWizardTCSTest extends GeneratedParserBasedTest {

    private static final String LANGUAGE = "Mydsl";
    private static final File[] METAMODELS = { new File("../com.sap.furcas.ide.projectwizard.test/model/Mydsl.ecore") };
    private static final String PACKAGE_URI = "http://www.furcas.org/projectwizard/example/mydsl";

    private static EMFParsingHelper parsingHelper; // 

    @BeforeClass
    public static void setupParser() throws Exception {
        GeneratedParserTestConfiguration testConfig = new GeneratedParserTestConfiguration(LANGUAGE, generateTCS(), METAMODELS);
        TCSSyntaxContainerBean syntaxBean = parseSyntax(testConfig);
        ParserFacade facade = generateParserForLanguage(syntaxBean, testConfig, new ClassLookupImpl());
        parsingHelper = new EMFParsingHelper(facade, testConfig, PACKAGE_URI);
    }

    @Test
    public void testGeneratedParser() throws IOException, UnknownProductionRuleException {
        String sample = "class ExampleClass";
        
        ModelParsingResult result = parsingHelper.parseString(sample, 0);
        EObject resultObject = (EObject) result.getParsedModelElement();
        
        assertNotNull(resultObject);
        assertEquals("ExampleClass", resultObject.eClass().getName());
    }

    public static File generateTCS() throws CodeGenerationException, IOException {
        File TCS = new File("../com.sap.furcas.ide.projectwizard.test/generationTemp/generated/Mydsl.tcs");
        SourceCodeFactory scf = new SourceCodeFactory();
        ProjectInfo pi = new ProjectInfo();
        pi.setLanguageName("Mydsl");
        pi.setClassName("ExampleClass");
        String  newContent = scf.createSampleTCS(pi);
        InputStream newStream = new ByteArrayInputStream(newContent.getBytes("UTF-8"));
        writeToFile(newStream, TCS);
        newStream.close();
        return TCS;
    }

    private static void writeToFile(InputStream inputStream, File targetFile) {
        try {
            DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(targetFile)));
            int c;
            while ((c = inputStream.read()) != -1) {
                out.writeByte(c);
            }
            inputStream.close();
            out.close();
        } catch (IOException e) {
            System.err.println("Error Writing/Reading Streams.");
        }
    }
}