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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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 *
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertTrue;

import java.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.spi.ToolProvider;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;

import jdk.test.lib.compiler.CompilerUtils;
import jdk.tools.jlink.internal.LinkableRuntimeImage;

/**
 * @test
 * @bug 8174826 8345573
 * @library /lib/testlibrary /test/lib
 * @modules jdk.charsets jdk.compiler jdk.jlink/jdk.tools.jlink.internal
 * @build SuggestProviders jdk.test.lib.compiler.CompilerUtils
 * @run testng SuggestProviders
 */

public class SuggestProviders {
    private static final String JAVA_HOME = System.getProperty("java.home");
    private static final String TEST_SRC = System.getProperty("test.src");

    private static final Path SRC_DIR = Paths.get(TEST_SRC, "src");
    private static final Path MODS_DIR = Paths.get("mods");

    private static final boolean LINKABLE_RUNTIME = LinkableRuntimeImage.isLinkableRuntime();
    private static final boolean JMODS_EXIST = Files.exists(Paths.get(JAVA_HOME, "jmods"));

    private static final String MODULE_PATH = (JMODS_EXIST ? Paths.get(JAVA_HOME, "jmods").toString() +
                                                             File.pathSeparator : "") +
                                              MODS_DIR.toString();

    // the names of the modules in this test
    private static String[] modules = new String[] {"m1", "m2", "m3"};


    private static boolean isExplodedJDKImage() {
        if (!JMODS_EXIST && !LINKABLE_RUNTIME) {
            System.err.println("Test skipped. Not a linkable runtime and no JMODs");
            return true;
        }
        return false;
    }

    /*
     * Compiles all modules used by the test
     */
    @BeforeTest
    public void compileAll() throws Throwable {
        if (isExplodedJDKImage()) return;

        for (String mn : modules) {
            Path msrc = SRC_DIR.resolve(mn);
            assertTrue(CompilerUtils.compile(msrc, MODS_DIR,
                "--module-source-path", SRC_DIR.toString()));
        }
    }

    // check a subset of services used by java.base
    private final List<String> JAVA_BASE_USES = List.of(
        "uses java.lang.System$LoggerFinder",
        "uses java.net.ContentHandlerFactory",
        "uses java.net.spi.URLStreamHandlerProvider",
        "uses java.nio.channels.spi.AsynchronousChannelProvider",
        "uses java.nio.channels.spi.SelectorProvider",
        "uses java.nio.charset.spi.CharsetProvider",
        "uses java.nio.file.spi.FileSystemProvider",
        "uses java.nio.file.spi.FileTypeDetector",
        "uses java.security.Provider",
        "uses java.util.spi.ToolProvider"
    );

    private final List<String> JAVA_BASE_PROVIDERS = List.of(
        "java.base provides java.nio.file.spi.FileSystemProvider used by java.base"
    );

    private final List<String> SYSTEM_PROVIDERS = List.of(
        "jdk.charsets provides java.nio.charset.spi.CharsetProvider used by java.base",
        "jdk.compiler provides java.util.spi.ToolProvider used by java.base",
        "jdk.compiler provides javax.tools.JavaCompiler used by java.compiler",
        "jdk.jlink provides jdk.tools.jlink.plugin.Plugin used by jdk.jlink",
        "jdk.jlink provides java.util.spi.ToolProvider used by java.base"
    );

    private final List<String> APP_USES = List.of(
        "uses p1.S",
        "uses p2.T"
    );

    private final List<String> APP_PROVIDERS = List.of(
        "m1 provides p1.S used by m1",
        "m2 provides p1.S used by m1",
        "m2 provides p2.T used by m2",
        "m3 provides p2.T used by m2",
        "m3 provides p3.S not used by any observable module"
    );

    @Test
    public void suggestProviders() throws Throwable {
        if (isExplodedJDKImage()) return;

        List<String> output = JLink.run("--module-path", MODULE_PATH,
                                        "--suggest-providers").output();

        Stream<String> uses =
            Stream.concat(JAVA_BASE_USES.stream(), APP_USES.stream());
        Stream<String> providers =
            Stream.concat(SYSTEM_PROVIDERS.stream(), APP_PROVIDERS.stream());

        assertTrue(output.containsAll(Stream.concat(uses, providers)
                                            .collect(Collectors.toList())));
    }

    /**
     * find providers from the observable modules and --add-modules has no
     * effect on the suggested providers
     */
    @Test
    public void observableModules() throws Throwable {
        if (isExplodedJDKImage()) return;

        List<String> output = JLink.run("--module-path", MODULE_PATH,
                                        "--add-modules", "m1",
                                        "--suggest-providers").output();

        Stream<String> uses =
            Stream.concat(JAVA_BASE_USES.stream(), Stream.of("uses p1.S"));
        Stream<String> providers =
            Stream.concat(SYSTEM_PROVIDERS.stream(), APP_PROVIDERS.stream());

        assertTrue(output.containsAll(Stream.concat(uses, providers)
                                            .collect(Collectors.toList())));
    }

    /**
     * find providers from the observable modules with --limit-modules
     */
    @Test
    public void limitModules() throws Throwable {
        if (isExplodedJDKImage()) return;

        List<String> output = JLink.run("--module-path", MODULE_PATH,
                                        "--limit-modules", "m1",
                                        "--suggest-providers").output();

        Stream<String> uses =
            Stream.concat(JAVA_BASE_USES.stream(), Stream.of("uses p1.S"));
        Stream<String> providers =
            Stream.concat(JAVA_BASE_PROVIDERS.stream(),
                          Stream.of("m1 provides p1.S used by m1")
        );

        assertTrue(output.containsAll(Stream.concat(uses, providers)
                                            .collect(Collectors.toList())));
    }

    @Test
    public void providersForServices() throws Throwable {
        if (isExplodedJDKImage()) return;

        List<String> output =
            JLink.run("--module-path", MODULE_PATH,
                      "--suggest-providers",
                      "java.nio.charset.spi.CharsetProvider,p1.S").output();

        System.out.println(output);
        Stream<String> expected = Stream.concat(
            Stream.of("jdk.charsets provides java.nio.charset.spi.CharsetProvider used by java.base"),
            Stream.of("m1 provides p1.S used by m1",
                      "m2 provides p1.S used by m1")
        );

        assertTrue(output.containsAll(expected.collect(Collectors.toList())));
    }

    @Test
    public void unusedService() throws Throwable {
        if (isExplodedJDKImage()) return;

        List<String> output =
            JLink.run("--module-path", MODULE_PATH,
                      "--suggest-providers",
                      "p3.S").output();

        List<String> expected = List.of(
            "m3 provides p3.S not used by any observable module"
        );
        assertTrue(output.containsAll(expected));

        // should not print other services m3 provides
        assertFalse(output.contains("m3 provides p2.T used by m2"));
    }

    @Test
    public void nonExistentService() throws Throwable {
        if (isExplodedJDKImage()) return;

        List<String> output =
            JLink.run("--module-path", MODULE_PATH,
                      "--suggest-providers",
                      "nonExistentType").output();

        List<String> expected = List.of(
            "No provider found for service specified to --suggest-providers: nonExistentType"
        );
        assertTrue(output.containsAll(expected));
    }

    @Test
    public void noSuggestProviders() throws Throwable {
        if (isExplodedJDKImage()) return;

        List<String> output =
            JLink.run("--module-path", MODULE_PATH,
                      "--bind-services",
                      "--suggest-providers").output();

        String expected = "--bind-services option is specified. No additional providers suggested.";
        assertTrue(output.contains(expected));

    }

    @Test
    public void suggestTypeNotRealProvider() throws Throwable {
        if (isExplodedJDKImage()) return;

        List<String> output =
            JLink.run("--module-path", MODULE_PATH,
                      "--add-modules", "m1",
                      "--suggest-providers",
                      "java.util.List").output();

        System.out.println(output);
        List<String> expected = List.of(
            "No provider found for service specified to --suggest-providers: java.util.List"
        );

        assertTrue(output.containsAll(expected));
    }

    @Test
    public void addNonObservableModule() throws Throwable {
        if (isExplodedJDKImage()) return;

        List<String> output =
            JLink.run("--module-path", MODULE_PATH,
                      "--add-modules", "nonExistentModule",
                      "--suggest-providers",
                      "java.nio.charset.spi.CharsetProvider").output();

        System.out.println(output);
        List<String> expected = List.of(
            "jdk.charsets provides java.nio.charset.spi.CharsetProvider used by java.base"
        );

        assertTrue(output.containsAll(expected));
    }

    static class JLink {
        static final ToolProvider JLINK_TOOL = ToolProvider.findFirst("jlink")
            .orElseThrow(() ->
                new RuntimeException("jlink tool not found")
            );

        static JLink run(String... options) {
            JLink jlink = new JLink();
            assertTrue(jlink.execute(options) == 0);
            return jlink;
        }

        final List<String> output = new ArrayList<>();
        private int execute(String... options) {
            System.out.println("jlink " +
                Stream.of(options).collect(Collectors.joining(" ")));

            StringWriter writer = new StringWriter();
            PrintWriter pw = new PrintWriter(writer);
            int rc = JLINK_TOOL.run(pw, pw, options);
            System.out.println(writer.toString());
            Stream.of(writer.toString().split("\\v"))
                  .map(String::trim)
                  .forEach(output::add);
            return rc;
        }

        boolean contains(String s) {
            return output.contains(s);
        }

        List<String> output() {
            return output;
        }
    }
}