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 * 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.
 *
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 * questions.
 */

/*
 * @test
 * @bug 8301580 8322159 8333107 8332230 8338678 8351260
 * @summary Verify error recovery w.r.t. Attr
 * @library /tools/lib
 * @modules jdk.compiler/com.sun.tools.javac.api
 *          jdk.compiler/com.sun.tools.javac.main
 * @build toolbox.ToolBox toolbox.JavacTask
 * @run main AttrRecovery
 */

import com.sun.source.tree.VariableTree;
import com.sun.source.util.TaskEvent;
import com.sun.source.util.TaskListener;
import com.sun.source.util.TreePathScanner;
import com.sun.source.util.Trees;
import java.nio.file.Path;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;
import javax.lang.model.element.Element;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeKind;
import javax.lang.model.type.TypeMirror;
import javax.tools.Diagnostic;

import toolbox.JavacTask;
import toolbox.Task.Expect;
import toolbox.Task.OutputKind;
import toolbox.TestRunner;
import toolbox.ToolBox;

public class AttrRecovery extends TestRunner {

    ToolBox tb;

    public AttrRecovery() {
        super(System.err);
        tb = new ToolBox();
    }

    public static void main(String[] args) throws Exception {
        AttrRecovery t = new AttrRecovery();
        t.runTests();
    }

    @Test
    public void testFlowExits() throws Exception {
        String code = """
                      class C {
                          void build
                          {
                              return ;
                          }
                      }
                      """;
        Path curPath = Path.of(".");
        List<String> actual = new JavacTask(tb)
                .options("-XDrawDiagnostics", "-XDdev", "-XDshould-stop.at=FLOW")
                .sources(code)
                .outdir(curPath)
                .run(Expect.FAIL)
                .getOutputLines(OutputKind.DIRECT);

        List<String> expected = List.of(
                "C.java:3:5: compiler.err.expected: '('",
                "C.java:4:9: compiler.err.ret.outside.meth",
                "2 errors"
        );

        if (!Objects.equals(actual, expected)) {
            error("Expected: " + expected + ", but got: " + actual);
        }
    }

    @Test
    public void testX() throws Exception {
        String code = """
                      public class C {
                          public C() {
                              Undefined.method();
                              undefined1();
                              Runnable r = this::undefined2;
                              overridable(this); //to verify ThisEscapeAnalyzer has been run
                          }
                          public void overridable(C c) {}
                      }
                      """;
        Path curPath = Path.of(".");
        List<String> actual = new JavacTask(tb)
                .options("-XDrawDiagnostics", "-XDdev",
                         "-XDshould-stop.at=WARN", "-Xlint:this-escape")
                .sources(code)
                .outdir(curPath)
                .run(Expect.FAIL)
                .writeAll()
                .getOutputLines(OutputKind.DIRECT);

        List<String> expected = List.of(
                "C.java:3:9: compiler.err.cant.resolve.location: kindname.variable, Undefined, , , (compiler.misc.location: kindname.class, C, null)",
                "C.java:4:9: compiler.err.cant.resolve.location.args: kindname.method, undefined1, , , (compiler.misc.location: kindname.class, C, null)",
                "C.java:5:22: compiler.err.invalid.mref: kindname.method, (compiler.misc.cant.resolve.location.args: kindname.method, undefined2, , , (compiler.misc.location: kindname.class, C, null))",
                "C.java:6:20: compiler.warn.possible.this.escape",
                "3 errors",
                "1 warning"
        );

        if (!Objects.equals(actual, expected)) {
            error("Expected: " + expected + ", but got: " + actual);
        }
    }

    @Test //JDK-8332230
    public void testAnnotationsInErroneousTree1() throws Exception {
        String code = """
                      package p;
                      public class C {
                          static int v;
                          public void t() {
                              //not a statement expression,
                              //will be wrapped in an erroneous tree:
                              p.@Ann C.v;
                          }
                          @interface Ann {}
                      }
                      """;
        Path curPath = Path.of(".");
        List<String> actual = new JavacTask(tb)
                .options("-XDrawDiagnostics", "-XDdev", "-XDshould-stop.at=FLOW")
                .sources(code)
                .outdir(curPath)
                .run(Expect.FAIL)
                .writeAll()
                .getOutputLines(OutputKind.DIRECT);

        List<String> expected = List.of(
                "C.java:7:17: compiler.err.not.stmt",
                "1 error"
        );

        if (!Objects.equals(actual, expected)) {
            error("Expected: " + expected + ", but got: " + actual);
        }
    }

    @Test //JDK-8333107
    public void testNestedLambda() throws Exception {
        String code = """
                      public class Dummy {
                          private void main() {
                              Stream l = null;
                              l.map(a -> {
                                  l.map(b -> {
                                      return null;
                                  });
                                  l.map(new FI() {
                                      public String convert(String s) {
                                          return null;
                                      }
                                  });
                                  class Local {}
                              });
                          }
                          public interface Stream {
                              public void map(FI fi);
                          }
                          public interface FI {
                              public String convert(String s);
                          }
                      }
                      """;
        Path curPath = Path.of(".");
        List<String> actual = new JavacTask(tb)
                .options("-XDrawDiagnostics", "-XDdev",
                         "-XDshould-stop.at=FLOW")
                .sources(code)
                .outdir(curPath)
                .run(Expect.FAIL)
                .writeAll()
                .getOutputLines(OutputKind.DIRECT);

        List<String> expected = List.of(
                "Dummy.java:4:10: compiler.err.cant.apply.symbol: kindname.method, map, Dummy.FI, @15, kindname.interface, Dummy.Stream, (compiler.misc.no.conforming.assignment.exists: (compiler.misc.incompatible.ret.type.in.lambda: (compiler.misc.missing.ret.val: java.lang.String)))",
                "1 error"
        );

        if (!Objects.equals(actual, expected)) {
            error("Expected: " + expected + ", but got: " + actual);
        }
    }

    @Test
    public void testErroneousTarget() throws Exception {
        String code = """
                      public class C {
                          public Undefined g(Undefined u) {
                              return switch (0) {
                                  default -> u;
                              };
                          }
                      }
                      """;
        Path curPath = Path.of(".");
        List<String> actual = new JavacTask(tb)
                .options("-XDrawDiagnostics")
                .sources(code)
                .outdir(curPath)
                .run(Expect.FAIL, 1)
                .writeAll()
                .getOutputLines(OutputKind.DIRECT);

        List<String> expected = List.of(
                "C.java:2:24: compiler.err.cant.resolve.location: kindname.class, Undefined, , , (compiler.misc.location: kindname.class, C, null)",
                "C.java:2:12: compiler.err.cant.resolve.location: kindname.class, Undefined, , , (compiler.misc.location: kindname.class, C, null)",
                "2 errors"
        );

        if (!Objects.equals(actual, expected)) {
            error("Expected: " + expected + ", but got: " + actual);
        }
    }

    @Test
    public void testParameterizedErroneousType() throws Exception {
        String code = """
                      public class C {
                          Undefined1<Undefined2, Undefined3> variable1;
                      }
                      """;
        Path curPath = Path.of(".");
        List<String> actual = new JavacTask(tb)
                .options("-XDrawDiagnostics")
                .sources(code)
                .outdir(curPath)
                .callback(task -> {
                    task.addTaskListener(new TaskListener() {
                        @Override
                        public void finished(TaskEvent e) {
                            Trees trees = Trees.instance(task);

                            if (e.getKind() == TaskEvent.Kind.ANALYZE) {
                                new TreePathScanner<Void, Void>() {
                                    @Override
                                    public Void visitVariable(VariableTree tree, Void p) {
                                        VariableElement var = (VariableElement) trees.getElement(getCurrentPath());

                                        trees.printMessage(Diagnostic.Kind.NOTE, type2String(var.asType()), tree, e.getCompilationUnit());

                                        return super.visitVariable(tree, p);
                                    }
                                }.scan(e.getCompilationUnit(), null);
                            }
                        }
                        Map<Element, Integer> identityRename = new IdentityHashMap<>();
                        String type2String(TypeMirror type) {
                            StringBuilder result = new StringBuilder();

                            result.append(type.getKind());
                            result.append(":");
                            result.append(type.toString());

                            if (type.getKind() == TypeKind.DECLARED ||
                                type.getKind() == TypeKind.ERROR) {
                                DeclaredType dt = (DeclaredType) type;
                                Element el = task.getTypes().asElement(dt);
                                result.append(":");
                                result.append(el.toString());
                                if (!dt.getTypeArguments().isEmpty()) {
                                    result.append(dt.getTypeArguments()
                                                    .stream()
                                                    .map(tm -> type2String(tm))
                                                    .collect(Collectors.joining(", ", "<", ">")));
                                }
                            } else {
                                throw new AssertionError(type.getKind().name());
                            }

                            return result.toString();
                        }
                    });
                })
                .run(Expect.FAIL)
                .writeAll()
                .getOutputLines(OutputKind.DIRECT);

        List<String> expected = List.of(
                "C.java:2:5: compiler.err.cant.resolve.location: kindname.class, Undefined1, , , (compiler.misc.location: kindname.class, C, null)",
                "C.java:2:16: compiler.err.cant.resolve.location: kindname.class, Undefined2, , , (compiler.misc.location: kindname.class, C, null)",
                "C.java:2:28: compiler.err.cant.resolve.location: kindname.class, Undefined3, , , (compiler.misc.location: kindname.class, C, null)",
                "C.java:2:40: compiler.note.proc.messager: ERROR:Undefined1<Undefined2,Undefined3>:Undefined1<ERROR:Undefined2:Undefined2, ERROR:Undefined3:Undefined3>",
                "3 errors"
        );

        if (!Objects.equals(actual, expected)) {
            error("Expected: " + expected + ", but got: " + actual);
        }
    }

    @Test //JDK-8351260
    public void testVeryBrokenAnnotation() throws Exception {
        String code = """
                      class ListUtilsTest {
                          void test(List<@AlphaChars <@StringLength(int value = 5)String> s){
                          }
                      }
                      """;
        Path curPath = Path.of(".");
        //should not fail with an exception:
        new JavacTask(tb)
            .options("-XDrawDiagnostics",
                     "-XDshould-stop.at=FLOW")
            .sources(code)
            .outdir(curPath)
            .run(Expect.FAIL)
            .writeAll();
    }
}
