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package jdk.jfr.event.runtime;

import static jdk.test.lib.Asserts.assertEquals;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedEvent;

import jdk.jfr.consumer.RecordedObject;

import jdk.test.lib.jfr.EventNames;

import jdk.test.lib.jfr.Events;

/*

 * @test

 * @summary Tests the JFR events related to modules

 * @key jfr

 * @library /test/lib

 * @run main/othervm --limit-modules java.base,jdk.jfr jdk.jfr.event.runtime.TestModuleEvents

 */

public final class TestModuleEvents {

    private static final String MODULE_EXPORT_EVENT_NAME = EventNames.ModuleExport;

    private static final String MODULE_REQUIRE_EVENT_NAME = EventNames.ModuleRequire;

    private static final String UNNAMED = "<unnamed>";

    public static void main(String[] args) throws Throwable {

        verifyRequiredModules();

        verifyExportedModules();

    }

    private static void verifyRequiredModules() throws Throwable {

        Recording recording = new Recording();

        recording.enable(MODULE_REQUIRE_EVENT_NAME);

        recording.start();

        recording.stop();

        List<RecordedEvent> events = Events.fromRecording(recording);

        assertDependency(events, "jdk.jfr", "java.base"); // jdk.jfr requires java.base (by edfault)

        assertDependency(events, "java.base", "jdk.jfr"); // java.base require jdk.jfr for JDK events, i.e. FileRead

        recording.close();

    }

    private static void assertDependency(List<RecordedEvent> events, String source, String required) throws Exception {

        for (RecordedEvent e : events) {

            String sourceModule = e.getValue("source.name");

            if (source.equals(sourceModule)) {

                RecordedObject module = e.getValue("requiredModule");

                if (module != null) {

                    if (required.equals(module.getValue("name"))) {

                        return;

                    }

                }

            }

        }

        throw new Exception("Could not find module dependency between " + source + " and requires modeule "+ required);

    }

    private static void verifyExportedModules() throws Throwable {

        Recording recording = new Recording();

        recording.enable(MODULE_EXPORT_EVENT_NAME);

        recording.start();

        recording.stop();

        Map<String, String> edges = new HashMap<>();

        List<RecordedEvent> events = Events.fromRecording(recording);

        events.stream().forEach((ev) -> {

            String exportedPackage = getValue(ev.getValue("exportedPackage"), "name", UNNAMED);

            String toModule = getValue(ev.getValue("targetModule"), "name", UNNAMED);

            edges.put(exportedPackage, toModule);

        });

        // We expect

        // 1) jdk.jfr -> <unnamed> (because we use the package)

        // 2) java.util -> <unnamed> (because we use the package)

        // 3) jdk.jfr.events -> java.base (from the jfr design)

        // 4) jdk.internal -> jdk.jfr (from the jfr design)

        // Where 'a -> b' means "package 'a' exported to module 'b'"

        assertEquals(edges.get("jdk/jfr"), UNNAMED);

        assertEquals(edges.get("java/util"), UNNAMED);

        assertEquals(edges.get("jdk/jfr/events"), "java.base");

        assertEquals(edges.get("jdk/internal"), "jdk.jfr");

        recording.close();

    }

    // Helper function to get field from a RecordedObject

    private static String getValue(RecordedObject ro, String field, String defVal) {

        if (ro != null && ro.getValue(field) != null) {

            return ro.getValue(field);

        } else {

            return defVal;

        }

    }

}