/*

 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 8012929

 * @summary Trees.getElement should work not only for declaration trees, but also for use-trees

 * @build TestGetElementReference

 * @run main TestGetElementReference

 */

import com.sun.source.tree.CompilationUnitTree;

import com.sun.source.tree.Tree;

import com.sun.source.util.*;

import java.io.File;

import java.io.IOException;

import java.net.URI;

import java.util.Arrays;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import javax.lang.model.element.Element;

import javax.tools.Diagnostic;

import javax.tools.DiagnosticCollector;

import javax.tools.JavaFileObject;

import javax.tools.SimpleJavaFileObject;

import javax.tools.StandardJavaFileManager;

import javax.tools.ToolProvider;

public class TestGetElementReference {

    public static void main(String... args) throws IOException {

        File source = new File(System.getProperty("test.src", "."), "TestGetElementReferenceData.java").getAbsoluteFile();

        try (StandardJavaFileManager fm = ToolProvider.getSystemJavaCompiler().getStandardFileManager(null, null, null)) {

            DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<>();

            JavacTask ct = (JavacTask) ToolProvider.getSystemJavaCompiler().getTask(null, null, diagnostics, Arrays.asList("-Xjcov"), null, fm.getJavaFileObjects(source));

            Trees trees = Trees.instance(ct);

            CompilationUnitTree cut = ct.parse().iterator().next();

            ct.analyze();

            for (Diagnostic<? extends JavaFileObject> d : diagnostics.getDiagnostics()) {

                if (d.getKind() == Diagnostic.Kind.ERROR) {

                    throw new IllegalStateException("Should have been attributed without errors: " + diagnostics.getDiagnostics());

                }

            }

            Pattern p = Pattern.compile("/\\*getElement:(.*?)\\*/");

            Matcher m = p.matcher(cut.getSourceFile().getCharContent(false));

            while (m.find()) {

                TreePath tp = pathFor(trees, cut, m.start() - 1);

                Element found = trees.getElement(tp);

                String expected = m.group(1);

                String actual = found != null ? found.getKind() + ":" + symbolToString(found) : "<null>";

                if (!expected.equals(actual)) {

                    throw new IllegalStateException("expected=" + expected + "; actual=" + actual);

                }

            }

        }

    }

    private static TreePath pathFor(final Trees trees, final CompilationUnitTree cut, final int pos) {

        final TreePath[] result = new TreePath[1];

        new TreePathScanner<Void, Void>() {

            @Override public Void scan(Tree node, Void p) {

                if (   node != null

                    && trees.getSourcePositions().getStartPosition(cut, node) <= pos

                    && pos <= trees.getSourcePositions().getEndPosition(cut, node)) {

                    result[0] = new TreePath(getCurrentPath(), node);

                    return super.scan(node, p);

                }

                return null;

            }

        }.scan(cut, null);

        return result[0];

    }

    private static String symbolToString(Element el) {

        switch (el.getKind()) {

            case METHOD: return symbolToString(el.getEnclosingElement()) + "." + el.toString();

            case CONSTRUCTOR: return symbolToString(el.getEnclosingElement().getEnclosingElement()) + "." + el.toString();

            default:

                return el.toString();

        }

    }

    static class TestFileObject extends SimpleJavaFileObject {

        private final String text;

        public TestFileObject(String text) {

            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);

            this.text = text;

        }

        @Override public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return text;

        }

    }

}