/*

 * Copyright (c) 2012, 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 8004833

 * @summary Integrate doclint support into javac

 */

import java.io.File;

import java.io.PrintWriter;

import java.io.StringWriter;

import java.net.URI;

import java.util.Arrays;

import java.util.Collections;

import java.util.List;

import javax.tools.Diagnostic;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.SimpleJavaFileObject;

import javax.tools.StandardJavaFileManager;

import javax.tools.StandardLocation;

import javax.tools.ToolProvider;

import static javax.tools.Diagnostic.Kind.*;

import com.sun.source.util.JavacTask;

import com.sun.tools.javac.main.Main;

import java.util.EnumSet;

import java.util.Set;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class DocLintTest {

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

        new DocLintTest().run();

    }

    JavaCompiler javac;

    StandardJavaFileManager fm;

    JavaFileObject file;

    final String code =

        /* 01 */    "/** Class comment. */\n" +

        /* 02 */    "public class Test {\n" +

        /* 03 */    "    /** Method comment. */\n" +

        /* 04 */    "    public void method() { }\n" +

        /* 05 */    "\n" +

        /* 06 */    "    /** Syntax < error. */\n" +

        /* 07 */    "    private void syntaxError() { }\n" +

        /* 08 */    "\n" +

        /* 09 */    "    /** @see DoesNotExist */\n" +

        /* 10 */    "    protected void referenceError() { }\n" +

        /* 08 */    "\n" +

        /* 09 */    "    /** @return */\n" +

        /* 10 */    "    public int emptyReturn() { return 0; }\n" +

        /* 11 */    "}\n";

    final String rawDiags = "-XDrawDiagnostics";

    private enum Message {

        // doclint messages

        DL_ERR6(ERROR, "Test.java:6:16: compiler.err.proc.messager: malformed HTML"),

        DL_ERR9(ERROR, "Test.java:9:14: compiler.err.proc.messager: reference not found"),

        DL_WRN12(WARNING, "Test.java:12:9: compiler.warn.proc.messager: no description for @return"),

        OPT_BADARG(ERROR, "invalid flag: -Xdoclint:badarg");

        final Diagnostic.Kind kind;

        final String text;

        static Message get(String text) {

            for (Message m: values()) {

                if (m.text.equals(text))

                    return m;

            }

            return null;

        }

        Message(Diagnostic.Kind kind, String text) {

            this.kind = kind;

            this.text = text;

        }

        @Override

        public String toString() {

            return "[" + kind + ",\"" + text + "\"]";

        }

    }

    void run() throws Exception {

        javac = ToolProvider.getSystemJavaCompiler();

        fm = javac.getStandardFileManager(null, null, null);

        fm.setLocation(StandardLocation.CLASS_OUTPUT, Arrays.asList(new File(".")));

        file = new SimpleJavaFileObject(URI.create("Test.java"), JavaFileObject.Kind.SOURCE) {

            @Override

            public CharSequence getCharContent(boolean ignoreEncoding) {

                return code;

            }

        };

        test(Collections.<String>emptyList(),

                Main.Result.OK,

                EnumSet.noneOf(Message.class));

        test(Arrays.asList("-Xdoclint:none"),

                Main.Result.OK,

                EnumSet.noneOf(Message.class));

        test(Arrays.asList(rawDiags, "-Xdoclint"),

                Main.Result.ERROR,

                EnumSet.of(Message.DL_ERR6, Message.DL_ERR9, Message.DL_WRN12));

        test(Arrays.asList(rawDiags, "-Xdoclint:all/public"),

                Main.Result.OK,

                EnumSet.of(Message.DL_WRN12));

        test(Arrays.asList(rawDiags, "-Xdoclint:syntax"),

                Main.Result.ERROR,

                EnumSet.of(Message.DL_ERR6, Message.DL_WRN12));

        test(Arrays.asList(rawDiags, "-Xdoclint:reference"),

                Main.Result.ERROR,

                EnumSet.of(Message.DL_ERR9));

        test(Arrays.asList(rawDiags, "-Xdoclint:badarg"),

                Main.Result.CMDERR,

                EnumSet.of(Message.OPT_BADARG));

        if (errors > 0)

            throw new Exception(errors + " errors occurred");

    }

    void test(List<String> opts, Main.Result expectResult, Set<Message> expectMessages) {

        System.err.println("test: " + opts);

        StringWriter sw = new StringWriter();

        PrintWriter pw = new PrintWriter(sw);

        List<JavaFileObject> files = Arrays.asList(file);

        try {

            JavacTask t = (JavacTask) javac.getTask(pw, fm, null, opts, null, files);

            boolean ok = t.call();

            pw.close();

            String out = sw.toString().replaceAll("[\r\n]+", "\n");

            if (!out.isEmpty())

                System.err.println(out);

            if (ok && expectResult != Main.Result.OK) {

                error("Compilation succeeded unexpectedly");

            } else if (!ok && expectResult != Main.Result.ERROR) {

                error("Compilation failed unexpectedly");

            } else

                check(out, expectMessages);

        } catch (IllegalArgumentException e) {

            System.err.println(e);

            String expectOut = expectMessages.iterator().next().text;

            if (expectResult != Main.Result.CMDERR)

                error("unexpected exception caught");

            else if (!e.getMessage().equals(expectOut)) {

                error("unexpected exception message: "

                        + e.getMessage()

                        + " expected: " + expectOut);

            }

        }

//        if (errors > 0)

//            throw new Error("stop");

    }

    private void check(String out, Set<Message> expect) {

        Pattern stats = Pattern.compile("^([1-9]+) (error|warning)(s?)");

        Set<Message> found = EnumSet.noneOf(Message.class);

        int e = 0, w = 0;

        if (!out.isEmpty()) {

            for (String line: out.split("[\r\n]+")) {

                Matcher s = stats.matcher(line);

                if (s.matches()) {

                    int i = Integer.valueOf(s.group(1));

                    if (s.group(2).equals("error"))

                        e++;

                    else

                        w++;

                    continue;

                }

                Message m = Message.get(line);

                if (m == null)

                    error("Unexpected line: " + line);

                else

                    found.add(m);

            }

        }

        for (Message m: expect) {

            if (!found.contains(m))

                error("expected message not found: " + m.text);

        }

        for (Message m: found) {

            if (!expect.contains(m))

                error("unexpected message found: " + m.text);

        }

    }

    void error(String msg) {

        System.err.println("Error: " + msg);

        errors++;

    }

    int errors;

}