/*
 * Copyright (c) 2003, 2018, 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.
 */

#include <stdio.h>
#include <string.h>
#include "jvmti.h"
#include "agent_common.h"
#include "JVMTITools.h"

extern "C" {


#define PASSED 0
#define STATUS_FAILED 2
#define WAIT_TIME 1000

static jvmtiEnv *jvmti = NULL;
static jvmtiEventCallbacks callbacks;
static jint result = PASSED;
static jboolean printdump = JNI_FALSE;
static jrawMonitorID wait_lock;
static const char *threadName = NULL;
static int startsCount = 0;
static int startsExpected = 0;
static int endsCount = 0;
static int endsExpected = 0;

void JNICALL ThreadStart(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread) {
    jvmtiError err;
    jvmtiThreadInfo inf;

    err = jvmti_env->GetThreadInfo(thread, &inf);
    if (err != JVMTI_ERROR_NONE) {
        printf("(GetThreadInfo, start) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    if (printdump == JNI_TRUE) {
        printf(">>> start: %s\n", inf.name);
    }
    if (inf.name != NULL && strcmp(inf.name, threadName) == 0) {
        startsCount++;
    }
}

void JNICALL ThreadEnd(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread) {
    jvmtiError err;
    jvmtiThreadInfo inf;

    err = jvmti_env->GetThreadInfo(thread, &inf);
    if (err != JVMTI_ERROR_NONE) {
        printf("(GetThreadInfo, end) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    if (printdump == JNI_TRUE) {
        printf(">>> end: %s\n", inf.name);
    }
    if (inf.name != NULL && strcmp(inf.name, threadName) == 0) {
        endsCount++;
    }
}

#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_threadstart003(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_threadstart003(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_threadstart003(JavaVM *jvm, char *options, void *reserved) {
    return JNI_VERSION_1_8;
}
#endif
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
    jvmtiError err;
    jint res;

    if (options != NULL && strcmp(options, "printdump") == 0) {
        printdump = JNI_TRUE;
    }

    res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
    if (res != JNI_OK || jvmti == NULL) {
        printf("Wrong result of a valid call to GetEnv!\n");
        return JNI_ERR;
    }

    callbacks.ThreadStart = &ThreadStart;
    callbacks.ThreadEnd = &ThreadEnd;
    err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
    if (err != JVMTI_ERROR_NONE) {
        printf("(SetEventCallbacks) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        return JNI_ERR;
    }

    return JNI_OK;
}

static void JNICALL
threadProc(jvmtiEnv* jvmti, JNIEnv* jni, void *unused) {
    jvmtiError err;

    err = jvmti->RawMonitorEnter(wait_lock);
    if (err != JVMTI_ERROR_NONE) {
        printf("(RawMonitorEnter) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    err = jvmti->RawMonitorNotify(wait_lock);
    if (err != JVMTI_ERROR_NONE) {
        printf("(RawMonitorNotify) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    err = jvmti->RawMonitorExit(wait_lock);
    if (err != JVMTI_ERROR_NONE) {
        printf("(RawMonitorExit) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
}

JNIEXPORT jint JNICALL
Java_nsk_jvmti_ThreadStart_threadstart003_check(JNIEnv *env,
        jclass cls, jthread thr, jstring name) {
    jvmtiError err;

    if (jvmti == NULL) {
        printf("JVMTI client was not properly loaded!\n");
        return STATUS_FAILED;
    }

    threadName = env->GetStringUTFChars(name, NULL);
    if (threadName == NULL) {
        printf("Failed to copy UTF-8 string!\n");
        return STATUS_FAILED;
    }

    err = jvmti->CreateRawMonitor("_wait_lock", &wait_lock);
    if (err != JVMTI_ERROR_NONE) {
        printf("(CreateRawMonitor) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        return STATUS_FAILED;
    }

    err = jvmti->SetEventNotificationMode(JVMTI_ENABLE,
            JVMTI_EVENT_THREAD_START, NULL);
    if (err == JVMTI_ERROR_NONE) {
        startsExpected = 1;
    } else {
        printf("Failed to enable JVMTI_EVENT_THREAD_START: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }

    err = jvmti->SetEventNotificationMode(JVMTI_ENABLE,
            JVMTI_EVENT_THREAD_END, NULL);
    if (err == JVMTI_ERROR_NONE) {
        endsExpected = 1;
    } else {
        printf("Failed to enable JVMTI_EVENT_THREAD_END: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }

    if (printdump == JNI_TRUE) {
        printf(">>> starting agent thread ...\n");
    }
    err = jvmti->RawMonitorEnter(wait_lock);
    if (err != JVMTI_ERROR_NONE) {
        printf("(RawMonitorEnter) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    err = jvmti->RunAgentThread(thr, threadProc,
        NULL, JVMTI_THREAD_MAX_PRIORITY);
    if (err != JVMTI_ERROR_NONE) {
        printf("(RunAgentThread) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    err = jvmti->RawMonitorWait(wait_lock, 0);
    if (err != JVMTI_ERROR_NONE) {
        printf("(RawMonitorWait) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    err = jvmti->RawMonitorExit(wait_lock);
    if (err != JVMTI_ERROR_NONE) {
        printf("(RawMonitorExit) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }

    err = jvmti->RawMonitorEnter(wait_lock);
    if (err != JVMTI_ERROR_NONE) {
        printf("(RawMonitorEnter) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    // Wait for up to 3 seconds for the thread end event
    {
        int i;
        for (i = 0; i < 3 ; i++) {
            err = jvmti->RawMonitorWait(wait_lock, (jlong)WAIT_TIME);
            if (endsCount == endsExpected || err != JVMTI_ERROR_NONE) {
                break;
            }
        }
    }
    if (err != JVMTI_ERROR_NONE) {
        printf("(RawMonitorWait) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    err = jvmti->RawMonitorExit(wait_lock);
    if (err != JVMTI_ERROR_NONE) {
        printf("(RawMonitorExit) unexpected error: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }

    err = jvmti->SetEventNotificationMode(JVMTI_DISABLE,
            JVMTI_EVENT_THREAD_START, NULL);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to disable JVMTI_EVENT_THREAD_START: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }

    err = jvmti->SetEventNotificationMode(JVMTI_DISABLE,
            JVMTI_EVENT_THREAD_END, NULL);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to disable JVMTI_EVENT_THREAD_END: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }

    if (startsCount != startsExpected) {
        printf("Wrong number of thread start events: %d, expected: %d\n",
            startsCount, startsExpected);
        result = STATUS_FAILED;
    }

    if (endsCount != endsExpected) {
        printf("Wrong number of thread end events: %d, expected: %d\n",
            endsCount, endsExpected);
        result = STATUS_FAILED;
    }

    return result;
}

}