/*

 * Copyright (c) 2010, 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 6981185

 * @summary  com.sun.tools.model.JavacTypes.contains() calls Type.contains instead of Types.containsType

 * @run main TestContainTypes

 */

import java.net.URI;

import java.util.Arrays;

import java.util.HashSet;

import java.util.Set;

import javax.annotation.processing.AbstractProcessor;

import javax.annotation.processing.RoundEnvironment;

import javax.lang.model.element.Element;

import javax.lang.model.element.TypeElement;

import javax.lang.model.element.ExecutableElement;

import javax.lang.model.type.TypeMirror;

import javax.lang.model.type.DeclaredType;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.SimpleJavaFileObject;

import javax.tools.ToolProvider;

import com.sun.source.util.JavacTask;

import javax.annotation.processing.SupportedSourceVersion;

import javax.lang.model.SourceVersion;

public class TestContainTypes {

    enum ClassType {

        OBJECT("Object"),

        NUMBER("Number"),

        INTEGER("Integer"),

        STRING("String");

        String classStub;

        ClassType(String classStub) {

            this.classStub = classStub;

        }

        boolean subtypeOf(ClassType that) {

            switch (that) {

                case OBJECT: return true;

                case NUMBER: return this == NUMBER || this == INTEGER;

                case INTEGER: return this == INTEGER;

                case STRING: return this == STRING;

                default: throw new AssertionError("Bad type kind in subtyping test");

            }

        }

    }

    enum ParameterType {

        INVARIANT("List<#1>"),

        COVARIANT("List<? extends #1>"),

        CONTRAVARIANT("List<? super #1>"),

        BIVARIANT("List<?>");

        String paramTypeStub;

        ParameterType(String paramTypeStub) {

            this.paramTypeStub = paramTypeStub;

        }

        String instantiate(ClassType ct) {

            return paramTypeStub.replace("#1", ct.classStub);

        }

        static boolean contains(ParameterType pt1, ClassType ct1,

                ParameterType pt2, ClassType ct2) {

            switch (pt1) {

                case INVARIANT: return (pt2 == INVARIANT && ct1 == ct2) ||

                                           (pt2 == CONTRAVARIANT && ct1 == ct2 && ct1 == ClassType.OBJECT);

                case COVARIANT: return ((pt2 == INVARIANT || pt2 == COVARIANT) &&

                                            ct2.subtypeOf(ct1)) ||

                                            (ct1 == ClassType.OBJECT);

                case CONTRAVARIANT: return (pt2 == INVARIANT || pt2 == CONTRAVARIANT) &&

                                            ct1.subtypeOf(ct2);

                case BIVARIANT: return true;

                default: throw new AssertionError("Bad type kind in containment test");

            }

        }

    }

    static class JavaSource extends SimpleJavaFileObject {

        final static String sourceStub =

                        "import java.util.List;\n" +

                        "@interface ToCheck {}\n" +

                        "class Test {\n" +

                        "   @ToCheck void test(#A a, #B b) {}\n" +

                        "}\n";

        String source;

        public JavaSource(String typeA, String typeB) {

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

            source = sourceStub.replace("#A", typeA).replace("#B", typeB);

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return source;

        }

    }

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

        for (ClassType ctA : ClassType.values()) {

            for (ParameterType ptA : ParameterType.values()) {

                for (ClassType ctB : ClassType.values()) {

                    for (ParameterType ptB : ParameterType.values()) {

                        compileAndCheck(ptA, ctA, ptB, ctB);

                    }

                }

            }

        }

    }

    static void compileAndCheck(ParameterType ptA, ClassType ctA, ParameterType ptB, ClassType ctB) throws Exception {

        JavaSource source = new JavaSource(ptA.instantiate(ctA), ptB.instantiate(ctB));

        final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

        JavacTask ct = (JavacTask)tool.getTask(null, null, null,

                null, null, Arrays.asList(source));

        ct.setProcessors(Arrays.asList(new ContainTypesTester(ParameterType.contains(ptA, ctA, ptB, ctB), source)));

        System.err.println("A = " + ptA +" / " + ptA.instantiate(ctA));

        System.err.println("B = " + ptB +" / " + ptB.instantiate(ctB));

        System.err.println("Source = " + source.source);

        ct.analyze();

    }

    @SupportedSourceVersion(SourceVersion.RELEASE_7)

    static class ContainTypesTester extends AbstractProcessor {

        boolean expected;

        JavaSource source;

        ContainTypesTester(boolean expected, JavaSource source) {

            this.expected = expected;

            this.source = source;

        }

        @Override

        public Set<String> getSupportedAnnotationTypes() {

            Set<String> supportedAnnos = new HashSet();

            supportedAnnos.add("*");

            return supportedAnnos;

        }

        private void error(String msg) {

            System.err.println(source.source);

            throw new AssertionError(msg);

        }

        @Override

        public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {

            if (roundEnv.getRootElements().size() == 0) {

                return true;

            }

            if (annotations.isEmpty() || annotations.size() > 1) {

                error("no anno found/wrong number of annotations found: " + annotations.size());

            }

            TypeElement anno = (TypeElement)annotations.toArray()[0];

            Set<? extends Element> annoElems = roundEnv.getElementsAnnotatedWith(anno);

            if (annoElems.isEmpty() || annoElems.size() > 1) {

                error("no annotated element found/wrong number of annotated elements found: " + annoElems.size());

            }

            Element annoElement = (Element)annoElems.toArray()[0];

            if (!(annoElement instanceof ExecutableElement)) {

                error("annotated element must be a method");

            }

            ExecutableElement method = (ExecutableElement)annoElement;

            if (method.getParameters().size() != 2) {

                error("annotated method must have 2 arguments");

            }

            DeclaredType d1 = (DeclaredType)method.getParameters().get(0).asType();

            DeclaredType d2 = (DeclaredType)method.getParameters().get(1).asType();

            if (d1.getTypeArguments().size() != 1 ||

                    d1.getTypeArguments().size() != 1) {

                error("parameter type must be generic in one type-variable");

            }

            TypeMirror t1 = d1.getTypeArguments().get(0);

            TypeMirror t2 = d2.getTypeArguments().get(0);

            if (processingEnv.getTypeUtils().contains(t1, t2) != expected) {

                error("bad type containment result\n" +

                        "t1 : " + t1 +"\n" +

                        "t2 : " + t2 +"\n" +

                        "expected answer : " + expected +"\n");

            }

            return true;

        }

    }

}