/* Functions related to the java process instances.                         */

/* Copyright (c) 2007-2017. The SimGrid Team. All rights reserved.          */

/* This program is free software; you can redistribute it and/or modify it
 * under the terms of the license (GNU LGPL) which comes with this package. */

#include <xbt/ex.hpp>

#include "jmsg_process.h"

#include "JavaContext.hpp"
#include "jmsg.hpp"
#include "jmsg_host.h"
#include "jxbt_utilities.hpp"

XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(java);

extern "C" {

jfieldID jprocess_field_Process_bind;
jfieldID jprocess_field_Process_host;
jfieldID jprocess_field_Process_killTime;
jfieldID jprocess_field_Process_name;
jfieldID jprocess_field_Process_pid;
jfieldID jprocess_field_Process_ppid;

jobject jprocess_from_native(msg_process_t process)
{
  simgrid::kernel::context::JavaContext* context = (simgrid::kernel::context::JavaContext*) MSG_process_get_smx_ctx(process);
  return context->jprocess;
}

jobject jprocess_ref(jobject jprocess, JNIEnv* env)
{
  return env->NewGlobalRef(jprocess);
}

void jprocess_unref(jobject jprocess, JNIEnv* env)
{
  env->DeleteGlobalRef(jprocess);
}

msg_process_t jprocess_to_native(jobject jprocess, JNIEnv* env)
{
  return (msg_process_t)(intptr_t)env->GetLongField(jprocess, jprocess_field_Process_bind);
}

void jprocess_bind(jobject jprocess, msg_process_t process, JNIEnv * env)
{
  env->SetLongField(jprocess, jprocess_field_Process_bind, (intptr_t)process);
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_nativeInit(JNIEnv *env, jclass cls) {
  jclass jprocess_class_Process = env->FindClass("org/simgrid/msg/Process");
  xbt_assert(jprocess_class_Process, "Native initialization of msg/Process failed. Please report that bug");

  jprocess_field_Process_name = jxbt_get_jfield(env, jprocess_class_Process, "name", "Ljava/lang/String;");
  jprocess_field_Process_bind = jxbt_get_jfield(env, jprocess_class_Process, "bind", "J");
  jprocess_field_Process_pid = jxbt_get_jfield(env, jprocess_class_Process, "pid", "I");
  jprocess_field_Process_ppid = jxbt_get_jfield(env, jprocess_class_Process, "ppid", "I");
  jprocess_field_Process_host = jxbt_get_jfield(env, jprocess_class_Process, "host", "Lorg/simgrid/msg/Host;");
  jprocess_field_Process_killTime = jxbt_get_jfield(env, jprocess_class_Process, "killTime", "D");
  xbt_assert(jprocess_field_Process_name && jprocess_field_Process_pid && jprocess_field_Process_ppid &&
                 jprocess_field_Process_host,
             "Native initialization of msg/Process failed. Please report that bug");
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_create(JNIEnv* env, jobject jprocess_arg, jobject jhost)
{
  /* create a global java process instance */
  jobject jprocess = jprocess_ref(jprocess_arg, env);

  /* Actually build the MSG process */
  jstring jname         = (jstring)env->GetObjectField(jprocess, jprocess_field_Process_name);
  const char* name      = env->GetStringUTFChars(jname, 0);
  msg_process_t process =
      MSG_process_create_from_stdfunc(name, [jprocess]() { simgrid::kernel::context::java_main_jprocess(jprocess); },
                                      /*data*/ nullptr, jhost_get_native(env, jhost), /* properties*/ nullptr);
  env->ReleaseStringUTFChars(jname, name);

  /* bind the java process instance to the native process */
  jprocess_bind(jprocess, process, env);

  /* Retrieve the kill time from the process */
  jdouble jkill = env->GetDoubleField(jprocess, jprocess_field_Process_killTime);
  MSG_process_set_kill_time(process, (double)jkill);

  /* sets the PID and the PPID of the process */
  env->SetIntField(jprocess, jprocess_field_Process_pid,(jint) MSG_process_get_PID(process));
  env->SetIntField(jprocess, jprocess_field_Process_ppid, (jint) MSG_process_get_PPID(process));
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_daemonize(JNIEnv* env, jobject jprocess)
{
  msg_process_t process = jprocess_to_native(jprocess, env);

  if (not process) {
    jxbt_throw_notbound(env, "process", jprocess);
    return;
  }

  MSG_process_daemonize(process);
}

JNIEXPORT jint JNICALL Java_org_simgrid_msg_Process_killAll(JNIEnv * env, jclass cls, jint jresetPID)
{
  return (jint) MSG_process_killall((int) jresetPID);
}

JNIEXPORT jobject JNICALL Java_org_simgrid_msg_Process_fromPID(JNIEnv * env, jclass cls, jint pid)
{
  msg_process_t process = MSG_process_from_PID(pid);

  if (not process) {
    jxbt_throw_process_not_found(env, std::string("PID = ") + std::to_string(static_cast<int>(pid)));
    return nullptr;
  }

  jobject jprocess = jprocess_from_native(process);

  if (not jprocess) {
    jxbt_throw_jni(env, "get process failed");
    return nullptr;
  }

  return jprocess;
}

JNIEXPORT jint JNICALL Java_org_simgrid_msg_Process_nativeGetPID(JNIEnv* env, jobject jprocess)
{
  msg_process_t process = jprocess_to_native(jprocess, env);
  return MSG_process_get_PID(process);
}

JNIEXPORT jobject JNICALL Java_org_simgrid_msg_Process_getProperty(JNIEnv *env, jobject jprocess, jobject jname) {
  msg_process_t process = jprocess_to_native(jprocess, env);

  if (not process) {
    jxbt_throw_notbound(env, "process", jprocess);
    return nullptr;
  }
  const char *name = env->GetStringUTFChars((jstring)jname, 0);

  const char *property = MSG_process_get_property_value(process, name);
  if (not property)
    return nullptr;

  jobject jproperty = env->NewStringUTF(property);

  env->ReleaseStringUTFChars((jstring)jname, name);

  return jproperty;
}

JNIEXPORT jobject JNICALL Java_org_simgrid_msg_Process_getCurrentProcess(JNIEnv * env, jclass cls)
{
  jobject jprocess = jprocess_from_native(MSG_process_self());
  if (not jprocess)
    jxbt_throw_jni(env, xbt_strdup("SIMIX_process_get_jprocess() failed"));

  return jprocess;
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_suspend(JNIEnv * env, jobject jprocess)
{
  msg_process_t process = jprocess_to_native(jprocess, env);

  if (not process) {
    jxbt_throw_notbound(env, "process", jprocess);
    return;
  }

  /* try to suspend the process */
  msg_error_t rv = MSG_process_suspend(process);

  jxbt_check_res("MSG_process_suspend()", rv, MSG_OK, "unexpected error , please report this bug");
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_resume(JNIEnv * env, jobject jprocess)
{
  msg_process_t process = jprocess_to_native(jprocess, env);

  if (not process) {
    jxbt_throw_notbound(env, "process", jprocess);
    return;
  }

  /* try to resume the process */
  msg_error_t res = MSG_process_resume(process);
  jxbt_check_res("MSG_process_resume()", res, MSG_OK, "unexpected error , please report this bug");
}

JNIEXPORT void
JNICALL Java_org_simgrid_msg_Process_setAutoRestart (JNIEnv *env, jobject jprocess, jboolean jauto_restart) {

  msg_process_t process = jprocess_to_native(jprocess, env);
  if (not process) {
    jxbt_throw_notbound(env, "process", jprocess);
    return;
  }

  MSG_process_auto_restart_set(process, (jauto_restart == JNI_TRUE));
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_restart (JNIEnv *env, jobject jprocess) {
  msg_process_t process = jprocess_to_native(jprocess, env);

  if (not process) {
    jxbt_throw_notbound(env, "process", jprocess);
    return;
  }

  MSG_process_restart(process);
}

JNIEXPORT jboolean JNICALL Java_org_simgrid_msg_Process_isSuspended(JNIEnv * env, jobject jprocess)
{
  msg_process_t process = jprocess_to_native(jprocess, env);

  if (not process) {
    jxbt_throw_notbound(env, "process", jprocess);
    return 0;
  }

  /* true is the process is suspended, false otherwise */
  return (jboolean) MSG_process_is_suspended(process);
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_sleep(JNIEnv *env, jclass cls, jlong jmillis, jint jnanos)
 {
  double time =  ((double)jmillis) / 1000 + ((double)jnanos) / 1000000000;
  msg_error_t rv;
  rv = MSG_process_sleep(time);
  if (rv != MSG_OK) {
    XBT_DEBUG("Something during the MSG_process_sleep invocation was wrong, trigger a HostFailureException");

    jxbt_throw_host_failure(env, "");
  }
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_waitFor(JNIEnv * env, jobject jprocess, jdouble jseconds)
{
  msg_error_t rv;
  rv = MSG_process_sleep((double)jseconds);
  if (env->ExceptionOccurred())
    return;
  if (rv != MSG_OK) {
    XBT_DEBUG("Status NOK");
    jmsg_throw_status(env,rv);
  }
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_kill(JNIEnv * env, jobject jprocess)
{
  /* get the native instances from the java ones */
  msg_process_t process = jprocess_to_native(jprocess, env);
  if (not process) {
    jxbt_throw_notbound(env, "process", jprocess);
    return;
  }
  try {
    MSG_process_kill(process);
  } catch (xbt_ex& ex) {
    XBT_VERB("Process %s just committed a suicide", MSG_process_get_name(process));
    xbt_assert(process == MSG_process_self(),
               "Killing a process should not raise an exception if it's not a suicide. Please report that bug.");
  }
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_migrate(JNIEnv * env, jobject jprocess, jobject jhost)
{
  msg_process_t process = jprocess_to_native(jprocess, env);

  if (not process) {
    jxbt_throw_notbound(env, "process", jprocess);
    return;
  }

  msg_host_t host = jhost_get_native(env, jhost);

  if (not host) {
    jxbt_throw_notbound(env, "host", jhost);
    return;
  }

  /* try to change the host of the process */
  msg_error_t rv = MSG_process_migrate(process, host);
  if (rv != MSG_OK) {
    jmsg_throw_status(env,rv);
    return;
  }
  /* change the host java side */
  env->SetObjectField(jprocess, jprocess_field_Process_host, jhost);
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_yield(JNIEnv* env, jclass cls)
{
  MSG_process_yield();
}

JNIEXPORT void JNICALL Java_org_simgrid_msg_Process_setKillTime (JNIEnv *env , jobject jprocess, jdouble jkilltime) {
  msg_process_t process = jprocess_to_native(jprocess, env);
  MSG_process_set_kill_time(process, (double)jkilltime);
}

JNIEXPORT jint JNICALL Java_org_simgrid_msg_Process_getCount(JNIEnv * env, jclass cls) {
  return (jint) MSG_process_get_number();
}
}
