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/*
 * @test
 * @bug 8325530
 * @summary Test that failed VirtualMachine.loadAgentPath/loadAgentLibrary reports detailed reason
 * @requires vm.jvmti
 * @modules jdk.attach
 * @library /test/lib
 * @run driver FailedLoadAgentTest
 */

import java.nio.file.Path;
import com.sun.tools.attach.AgentLoadException;
import com.sun.tools.attach.VirtualMachine;

import jdk.test.lib.Platform;
import jdk.test.lib.Utils;
import jdk.test.lib.apps.LingeredApp;

public class FailedLoadAgentTest {
    private static final String jvmtiAgentLib = "FailedLoadAgentTestNotExists";
    private static final String jvmtiAgentPath = getLibPath(jvmtiAgentLib);

    private static String getLibPath(String libName) {
        String fullName = Platform.buildSharedLibraryName(libName);
        return Path.of(Utils.TEST_NATIVE_PATH, fullName).toAbsolutePath().toString();
    }

    private interface TestAction {
        void test() throws Exception;
    }

    private static void test(TestAction action) throws Exception {
        try {
            action.test();
            throw new RuntimeException("AgentLoadException not thrown");
        } catch (AgentLoadException ex) {
            System.out.println("AgentLoadException thrown as expected:");
            ex.printStackTrace(System.out);
            String msg = ex.getMessage();
            // Attach agent prints general "<agent> was not loaded." message on error.
            // But additionally we expect detailed message with the reason.
            String parts[] = msg.split("was not loaded.");
            if (parts.length < 2 || parts[1].isEmpty()) {
                throw new RuntimeException("AgentLoadException message is vague");
            }
        }
    }

    public static void main(String[] args) throws Exception {
        LingeredApp theApp = null;
        try {
            theApp = new LingeredApp();
            LingeredApp.startApp(theApp, "-XX:+EnableDynamicAgentLoading");

            VirtualMachine vm = VirtualMachine.attach(Long.toString(theApp.getPid()));

            // absolute path
            test(() -> vm.loadAgentPath(jvmtiAgentPath));
            // relative path
            test(() -> vm.loadAgentLibrary(jvmtiAgentLib));

        } finally {
            LingeredApp.stopApp(theApp);
        }
    }

}