/*
 * 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 <stdlib.h>
#include <string.h>
#include "jvmti.h"
#include "agent_common.h"
#include "JVMTITools.h"

extern "C" {


#define PASSED  0
#define STATUS_FAILED  2

typedef struct {
    int cnt;
    const char **thrNames;
} info;

static jvmtiEnv *jvmti;
static jrawMonitorID lock1;
static jrawMonitorID lock2;
static jboolean printdump = JNI_FALSE;
static jint result = PASSED;
static jvmtiThreadInfo inf;
static int sys_cnt;
static const char *names0[] = {"main"};
static const char *names1[] = {"main", "thread1"};
static const char *names2[] = {"main", "Thread-"};
static info thrInfo[] = {
    {1, names0}, {1, names0}, {2, names1}, {1, names0}, {2, names2}
};

jthread jthr(JNIEnv *env) {
    jclass thrClass;
    jmethodID cid;
    jthread res;
    thrClass = env->FindClass("java/lang/Thread");
    cid = env->GetMethodID(thrClass, "<init>", "()V");
    res = env->NewObject(thrClass, cid);
    return res;
}

static void JNICALL
sys_thread(jvmtiEnv* jvmti, JNIEnv* jni, void *p) {
    jvmtiError err;

    err = jvmti->RawMonitorEnter(lock2);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to enter raw monitor 2 (thread): %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }

    /* allows the main thread to wait until the child thread is running */
    err = jvmti->RawMonitorEnter(lock1);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to enter raw monitor 1 (thread): %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    err = jvmti->RawMonitorNotify(lock1);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to notify raw monitor (thread): %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    err = jvmti->RawMonitorExit(lock1);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to exit raw monitor 1 (thread): %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }

    /* keeps the child thread from exiting */
    err = jvmti->RawMonitorWait(lock2, (jlong)0);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to wait raw monitor (thread): %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
    err = jvmti->RawMonitorExit(lock2);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to exit raw monitor 2 (thread): %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }
}

#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_allthr001(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_allthr001(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_allthr001(JavaVM *jvm, char *options, void *reserved) {
    return JNI_VERSION_1_8;
}
#endif
jint  Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
    jint res;
    jvmtiError err;

    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;
    }

    err = jvmti->CreateRawMonitor("_lock1", &lock1);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to create raw monitor 1, err = %d\n", err);
        return JNI_ERR;
    }

    err = jvmti->CreateRawMonitor("_lock2", &lock2);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to create raw monitor 2, err = %d\n", err);
        return JNI_ERR;
    }

    return JNI_OK;
}

JNIEXPORT void checkInfo(JNIEnv *env, int ind) {
    jint threadsCount = -1;
    jthread *threads;
    int i, j, found;
    jvmtiError err;
    int num_unexpected = 0;

    if (printdump == JNI_TRUE) {
        printf(" >>> Check: %d\n", ind);
    }

    if (ind == 4) {
        err = jvmti->RawMonitorEnter(lock1);
        if (err != JVMTI_ERROR_NONE) {
            printf("Failed to enter raw monitor (check): %s (%d)\n",
                   TranslateError(err), err);
            result = STATUS_FAILED;
        }
        err = jvmti->RunAgentThread(jthr(env), sys_thread, NULL,
                                       JVMTI_THREAD_NORM_PRIORITY);
        if (err != JVMTI_ERROR_NONE) {
            printf("Failed to start agent thread: %s (%d)\n",
                   TranslateError(err), err);
            result = STATUS_FAILED;
        }
        err = jvmti->RawMonitorWait(lock1, (jlong)0);
        if (err != JVMTI_ERROR_NONE) {
            printf("Failed to wait raw monitor (check): %s (%d)\n",
                   TranslateError(err), err);
            result = STATUS_FAILED;
        }
        err = jvmti->RawMonitorExit(lock1);
        if (err != JVMTI_ERROR_NONE) {
            printf("Failed to exit raw monitor (check): %s (%d)\n",
                   TranslateError(err), err);
            result = STATUS_FAILED;
        }
    }

    err = jvmti->GetAllThreads(&threadsCount, &threads);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to get all threads (check): %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }

    for (i = 0; i < threadsCount; i++) {
        if (!isThreadExpected(jvmti, threads[i])) {
            num_unexpected++;
        }
    }

    if (threadsCount - num_unexpected != thrInfo[ind].cnt + sys_cnt) {
        printf("Point %d: number of threads expected: %d, got: %d\n",
            ind, thrInfo[ind].cnt + sys_cnt, threadsCount - num_unexpected);
        result = STATUS_FAILED;
    }

    for (i = 0; i < thrInfo[ind].cnt; i++) {
        for (j = 0, found = 0; j < threadsCount && !found; j++) {
            err = jvmti->GetThreadInfo(threads[j], &inf);
            if (err != JVMTI_ERROR_NONE) {
                printf("Failed to get thread info: %s (%d)\n",
                       TranslateError(err), err);
                result = STATUS_FAILED;
            }
            if (printdump == JNI_TRUE) {
                printf(" >>> %s", inf.name);
            }
            found = (inf.name != NULL &&
                     strstr(inf.name, thrInfo[ind].thrNames[i]) == inf.name &&
                     (ind == 4 || strlen(inf.name) ==
                      strlen(thrInfo[ind].thrNames[i])));
        }
        if (printdump == JNI_TRUE) {
            printf("\n");
        }
        if (!found) {
            printf("Point %d: thread %s not detected\n",
                   ind, thrInfo[ind].thrNames[i]);
            result = STATUS_FAILED;
        }
    }

    err = jvmti->Deallocate((unsigned char *)threads);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to deallocate array: %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }

    if (ind == 4) {
        err = jvmti->RawMonitorEnter(lock2);
        if (err != JVMTI_ERROR_NONE) {
            printf("Failed to enter raw monitor (check): %s (%d)\n",
                   TranslateError(err), err);
            result = STATUS_FAILED;
        }
        err = jvmti->RawMonitorNotify(lock2);
        if (err != JVMTI_ERROR_NONE) {
            printf("Failed to notify raw monitor (check): %s (%d)\n",
                   TranslateError(err), err);
            result = STATUS_FAILED;
        }
        err = jvmti->RawMonitorExit(lock2);
        if (err != JVMTI_ERROR_NONE) {
            printf("Failed to exit raw monitor (check): %s (%d)\n",
                   TranslateError(err), err);
            result = STATUS_FAILED;
        }
    }
}

JNIEXPORT void JNICALL Java_nsk_jvmti_GetAllThreads_allthr001_setSysCnt(JNIEnv *env, jclass cls) {
    jint threadsCount = -1;
    jthread *threads;
    jvmtiError err;
    int i;

    err = jvmti->GetAllThreads(&threadsCount, &threads);
    if (err != JVMTI_ERROR_NONE) {
        printf("Failed to get all threads (count): %s (%d)\n",
               TranslateError(err), err);
        result = STATUS_FAILED;
    }

    sys_cnt = threadsCount - 1;

    for (i = 0; i < threadsCount; i++) {
        if (!isThreadExpected(jvmti, threads[i])) {
            sys_cnt--;
        }
    }

    if (printdump == JNI_TRUE) {
        printf(" >>> number of system threads: %d\n", sys_cnt);
    }
}

JNIEXPORT void JNICALL
Java_nsk_jvmti_GetAllThreads_allthr001_checkInfo(JNIEnv *env, jclass cls, jint ind) {
    checkInfo(env, ind);
}

JNIEXPORT jint JNICALL Java_nsk_jvmti_GetAllThreads_allthr001_getRes(JNIEnv *env, jclass cls) {
    return result;
}

}