/*
 * (C) Copyright 2010-2015 SAP SE.
 *               2016      The University of Sheffield.
 *
 * 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 com.logicalhacking.dasca.dataflow.util;

import java.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.jar.JarFile;

import org.junit.Assert;

import com.ibm.wala.cast.java.client.ECJJavaSourceAnalysisEngine;
import com.ibm.wala.cast.java.client.JavaSourceAnalysisEngine;
import com.ibm.wala.cast.java.ipa.callgraph.JavaSourceAnalysisScope;
import com.ibm.wala.classLoader.JarFileModule;
import com.ibm.wala.classLoader.SourceDirectoryTreeModule;
import com.ibm.wala.classLoader.SourceFileModule;
import com.ibm.wala.ipa.callgraph.AnalysisScope;
import com.ibm.wala.ipa.callgraph.Entrypoint;
import com.ibm.wala.ipa.callgraph.impl.Util;
import com.ibm.wala.ipa.cha.IClassHierarchy;

public class PlugInUtil {

    public static String REGRESSION_EXCLUSIONS;

    /**
     * Private constructor to ensure no object will be created
     */
    private PlugInUtil() {
    }

    public static void populateScope(JavaSourceAnalysisEngine engine, Collection<String> sources, List<String> libs) {
        if (null != libs ) {
            boolean foundLib = false;
            for (String lib : libs) {
                File libFile = new File(lib);
                if (libFile.exists()) {
                    foundLib = true;
                    try {
                        engine.addSystemModule(new JarFileModule(new JarFile(libFile, false)));
                    } catch (IOException e) {
                        Assert.fail(e.getMessage());
                    }
                }
            }
            assert foundLib : "couldn't find library file from " + libs;
        }

        for (String srcFilePath : sources) {
            String srcFileName = srcFilePath.substring(srcFilePath.lastIndexOf(File.separator) + 1);
            File f = new File(srcFilePath);
            Assert.assertTrue("couldn't find " + srcFilePath, f.exists());
            if (f.isDirectory()) {
                engine.addSourceModule(new SourceDirectoryTreeModule(f));
            } else {
                engine.addSourceModule(new SourceFileModule(f, srcFileName, null));
            }
        }
    }




    public static JavaSourceAnalysisEngine
    createECJJavaEngine(Collection<String> sources, List<String> libs, final String [] entryPoints)  {
        JavaSourceAnalysisEngine engine=null;
        if(null == entryPoints) {
            engine = new ECJJavaSourceAnalysisEngine();
        } else {
            engine = new ECJJavaSourceAnalysisEngine() {
                @Override
                protected Iterable<Entrypoint> makeDefaultEntrypoints(AnalysisScope scope, IClassHierarchy cha) {
                    return Util.makeMainEntrypoints(JavaSourceAnalysisScope.SOURCE,cha, entryPoints);
                }
            };
        }
        engine.setExclusionsFile(REGRESSION_EXCLUSIONS);
        populateScope(engine, sources, libs);
        return engine;
    }

}