/*
 * This file is part of libbluray
 * Copyright (C) 2010  William Hahne
 * Copyright (C) 2012  Petri Hintukainen <phintuka@users.sourceforge.net>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.s
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see
 * <http://www.gnu.org/licenses/>.
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include "bdj.h"

#include "native/register_native.h"

#include "file/dirs.h"
#include "file/dl.h"
#include "util/strutl.h"
#include "util/macro.h"
#include "util/logging.h"


#include <jni.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef _WIN32
#include <windows.h>
#include <winreg.h>
#define DIR_SEP "\\"
#else
#define DIR_SEP "/"
#endif

#ifdef HAVE_BDJ_J2ME
#define BDJ_JARFILE "libbluray-j2me-" VERSION ".jar"
#else
#define BDJ_JARFILE "libbluray-j2se-" VERSION ".jar"
#endif

struct bdjava_s {
    void   *h_libjvm;
    JavaVM *jvm;
};

typedef jint (JNICALL * fptr_JNI_CreateJavaVM) (JavaVM **pvm, void **penv,void *args);
typedef jint (JNICALL * fptr_JNI_GetCreatedJavaVMs) (JavaVM **vmBuf, jsize bufLen, jsize *nVMs);

#if defined(_WIN32) && !defined(HAVE_BDJ_J2ME)
static void *_load_jvm_win32(const char **p_java_home)
{
    static char java_home[256] = "";

    wchar_t buf_loc[4096] = L"SOFTWARE\\JavaSoft\\Java Runtime Environment\\";
    wchar_t buf_vers[128];

    char strbuf[256];

    LONG r;
    DWORD lType;
    DWORD dSize = sizeof(buf_vers);
    HKEY hkey;

    r = RegOpenKeyExW(HKEY_LOCAL_MACHINE, buf_loc, 0, KEY_READ, &hkey);
    if (r != ERROR_SUCCESS) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Error opening registry key SOFTWARE\\JavaSoft\\Java Runtime Environment\\");
        return NULL;
    }

    r = RegQueryValueExW(hkey, L"CurrentVersion", NULL, &lType, (LPBYTE)buf_vers, &dSize);
    RegCloseKey(hkey);
    if (r != ERROR_SUCCESS) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "CurrentVersion registry value not found");
        return NULL;
    }

    if (debug_mask & DBG_BDJ) {
        WideCharToMultiByte(CP_UTF8, 0, buf_vers, -1, strbuf, sizeof(strbuf), NULL, NULL);
        BD_DEBUG(DBG_BDJ, "JRE version: %s\n", strbuf);
    }
    wcscat(buf_loc, buf_vers);

    dSize = sizeof(buf_loc);
    r = RegOpenKeyExW(HKEY_LOCAL_MACHINE, buf_loc, 0, KEY_READ, &hkey);
    if (r != ERROR_SUCCESS) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Error opening JRE version-specific registry key");
        return NULL;
    }

    r = RegQueryValueExW(hkey, L"JavaHome", NULL, &lType, (LPBYTE)buf_loc, &dSize);

    if (r == ERROR_SUCCESS) {
        /* do not fail even if not found */
        WideCharToMultiByte(CP_UTF8, 0, buf_loc, -1, java_home, sizeof(java_home), NULL, NULL);
        *p_java_home = java_home;
        BD_DEBUG(DBG_BDJ, "JavaHome: %s\n", java_home);
    }

    dSize = sizeof(buf_loc);
    r = RegQueryValueExW(hkey, L"RuntimeLib", NULL, &lType, (LPBYTE)buf_loc, &dSize);
    RegCloseKey(hkey);

    if (r != ERROR_SUCCESS) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "RuntimeLib registry value not found");
        return NULL;
    }

    void *result = LoadLibraryW(buf_loc);

    WideCharToMultiByte(CP_UTF8, 0, buf_loc, -1, strbuf, sizeof(strbuf), NULL, NULL);
    if (!result) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "can't open library '%s'\n", strbuf);
    } else {
        BD_DEBUG(DBG_BDJ, "Using JRE library %s\n", strbuf);
    }

    return result;
}
#endif

static void *_jvm_dlopen(const char *java_home, const char *jvm_dir, const char *jvm_lib)
{
    if (java_home) {
        char *path = str_printf("%s/%s/%s", java_home, jvm_dir, jvm_lib);
        if (!path) {
            BD_DEBUG(DBG_CRIT, "out of memory\n");
            return NULL;
        }
        BD_DEBUG(DBG_BDJ, "Opening %s ...\n", path);
        void *h = dl_dlopen(path, NULL);
        X_FREE(path);
        return h;
    } else {
        BD_DEBUG(DBG_BDJ, "Opening %s ...\n", jvm_lib);
        return dl_dlopen(jvm_lib, NULL);
    }
}

static void *_load_jvm(const char **p_java_home)
{
#ifdef HAVE_BDJ_J2ME
# ifdef _WIN32
    static const char *jvm_path[] = {NULL, JDK_HOME};
    static const char  jvm_dir[]  = "bin";
    static const char  jvm_lib[]  = "cvmi";
# else
    static const char *jvm_path[] = {NULL, JDK_HOME, "/opt/PhoneME"};
    static const char  jvm_dir[]  = "bin";
    static const char  jvm_lib[]  = "libcvm";
# endif
#else
# ifdef _WIN32
    static const char *jvm_path[] = {NULL, JDK_HOME};
    static const char  jvm_dir[]  = "jre/bin/server";
    static const char  jvm_lib[]  = "jvm";
# else
    static const char *jvm_path[] = {NULL, JDK_HOME,
                                    "/usr/lib/jvm/default-java",
                                    "/usr/lib/jvm/java-6-openjdk",
                                    "/usr/lib/jvm/java-7-openjdk",
                                    "/etc/java-config-2/current-system-vm"};
    static const char  jvm_dir[]  = "jre/lib/" JAVA_ARCH "/server";
    static const char  jvm_lib[]  = "libjvm";
# endif
#endif
    const char *java_home = NULL;
    unsigned    path_ind;
    void       *handle = NULL;

    /* JAVA_HOME set, use it */
    java_home = getenv("JAVA_HOME");
    if (java_home) {
        *p_java_home = java_home;
        return _jvm_dlopen(java_home, jvm_dir, jvm_lib);
    }

#if defined(_WIN32) && !defined(HAVE_BDJ_J2ME)
    handle = _load_jvm_win32(p_java_home);
    if (handle) {
        return handle;
    }
#endif

    BD_DEBUG(DBG_BDJ, "JAVA_HOME not set, trying default locations\n");

    /* try our pre-defined locations */
    for (path_ind = 0; !handle && path_ind < sizeof(jvm_path) / sizeof(jvm_path[0]); path_ind++) {
        *p_java_home = jvm_path[path_ind];
        handle = _jvm_dlopen(jvm_path[path_ind], jvm_dir, jvm_lib);
    }

    if (!*p_java_home) {
        *p_java_home = dl_get_path();
    }

    return handle;
}

static int _can_read_file(const char *fn)
{
    FILE *fp;

    if (!fn) {
        return 0;
    }

    fp = fopen(fn, "rb");
    if (fp) {
        char b;
        int result = (int)fread(&b, 1, 1, fp);
        fclose(fp);
        if (result == 1) {
            return 1;
        }
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Error reading %s\n", fn);
    }
    return 0;
}

static const char *_find_libbluray_jar(BDJ_STORAGE *storage)
{
    // pre-defined search paths for libbluray.jar
    static const char * const jar_paths[] = {
#ifdef _WIN32
        "" BDJ_JARFILE,
#else
        "/usr/share/java/" BDJ_JARFILE,
        "/usr/share/libbluray/lib/" BDJ_JARFILE,
#endif
    };

    unsigned i;

    if (storage->classpath) {
        return storage->classpath;
    }

    // check if overriding the classpath
    const char *classpath = getenv("LIBBLURAY_CP");
    if (classpath) {
        size_t cp_len = strlen(classpath);

        // directory or file ?
        if (cp_len > 0 && (classpath[cp_len - 1] == '/' || classpath[cp_len - 1] == '\\')) {
            storage->classpath = str_printf("%s%s", classpath, BDJ_JARFILE);
        } else {
            storage->classpath = str_dup(classpath);
        }

        if (_can_read_file(storage->classpath)) {
            return storage->classpath;
        }

        X_FREE(storage->classpath);
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "invalid LIBBLURAY_CP %s\n", classpath);
        return NULL;
    }

    BD_DEBUG(DBG_BDJ, "LIBBLURAY_CP not set, searching for "BDJ_JARFILE" ...\n");

    // check directory where libbluray.so was loaded from
    const char *lib_path = dl_get_path();
    if (lib_path) {
        char *cp = str_printf("%s" BDJ_JARFILE, lib_path);
        BD_DEBUG(DBG_BDJ, "Checking %s ...\n", cp);
        if (_can_read_file(cp)) {
            storage->classpath = cp;
            BD_DEBUG(DBG_BDJ, "using %s\n", cp);
            return cp;
        }
        X_FREE(cp);
    }

    // check pre-defined directories
    for (i = 0; i < sizeof(jar_paths) / sizeof(jar_paths[0]); i++) {
        BD_DEBUG(DBG_BDJ, "Checking %s ...\n", jar_paths[i]);
        if (_can_read_file(jar_paths[i])) {
            storage->classpath = str_dup(jar_paths[i]);
            BD_DEBUG(DBG_BDJ, "using %s\n", storage->classpath);
            return storage->classpath;
        }
    }

    // try from current directory
    if (_can_read_file(BDJ_JARFILE)) {
        storage->classpath = str_dup(BDJ_JARFILE);
        BD_DEBUG(DBG_BDJ, "using %s\n", storage->classpath);
        return storage->classpath;
    }

    BD_DEBUG(DBG_BDJ | DBG_CRIT, BDJ_JARFILE" not found.\n");
    return NULL;
}

static const char *_bdj_persistent_root(BDJ_STORAGE *storage)
{
    const char *root;
    char       *data_home;

    if (!storage->persistent_root) {

        root = getenv("LIBBLURAY_PERSISTENT_ROOT");
        if (root) {
            return root;
        }

        data_home = file_get_data_home();
        storage->persistent_root = str_printf("%s" DIR_SEP "bluray" DIR_SEP "dvb.persistent.root" DIR_SEP, data_home ? data_home : "");
        X_FREE(data_home);

        BD_DEBUG(DBG_BDJ, "LIBBLURAY_PERSISTENT_ROOT not set, using %s\n", storage->persistent_root);
    }

    return storage->persistent_root;
}

static const char *_bdj_buda_root(BDJ_STORAGE *storage)
{
    const char *root;
    char       *cache_home;

    if (!storage->cache_root) {

        root = getenv("LIBBLURAY_CACHE_ROOT");
        if (root) {
            return root;
        }

        cache_home = file_get_cache_home();
        storage->cache_root = str_printf("%s" DIR_SEP "bluray" DIR_SEP "bluray.bindingunit.root" DIR_SEP, cache_home ? cache_home : "");
        X_FREE(cache_home);

        BD_DEBUG(DBG_BDJ, "LIBBLURAY_CACHE_ROOT not set, using %s\n", storage->cache_root);
    }

    return storage->cache_root;
}

static int _get_method(JNIEnv *env, jclass *cls, jmethodID *method_id,
                       const char *class_name, const char *method_name, const char *method_sig)
{
    *method_id = NULL;
    *cls = (*env)->FindClass(env, class_name);
    if (!*cls) {
        (*env)->ExceptionDescribe(env);
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Failed to locate class %s\n", class_name);
        (*env)->ExceptionClear(env);
        return 0;
    }

    *method_id = (*env)->GetStaticMethodID(env, *cls, method_name, method_sig);
    if (!*method_id) {
        (*env)->ExceptionDescribe(env);
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Failed to locate class %s method %s %s\n",
                 class_name, method_name, method_sig);
        (*env)->DeleteLocalRef(env, *cls);
        *cls = NULL;
        (*env)->ExceptionClear(env);
        return 0;
    }

    return 1;
}

static int _bdj_init(JNIEnv *env, struct bluray *bd, const char *disc_root, const char *bdj_disc_id,
                     BDJ_STORAGE *storage)
{
    if (!bdj_register_native_methods(env)) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Couldn't register native methods.\n");
    }

    // initialize class org.videolan.Libbluray
    jclass init_class;
    jmethodID init_id;
    if (!_get_method(env, &init_class, &init_id,
                     "org/videolan/Libbluray", "init",
                     "(JLjava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V")) {
        return 0;
    }

    const char *disc_id = (bdj_disc_id && bdj_disc_id[0]) ? bdj_disc_id : "00000000000000000000000000000000";
    jlong param_bdjava_ptr = (jlong)(intptr_t) bd;
    jstring param_disc_id = (*env)->NewStringUTF(env, disc_id);
    jstring param_disc_root = (*env)->NewStringUTF(env, disc_root);
    jstring param_persistent_root = (*env)->NewStringUTF(env, _bdj_persistent_root(storage));
    jstring param_buda_root = (*env)->NewStringUTF(env, _bdj_buda_root(storage));

    (*env)->CallStaticVoidMethod(env, init_class, init_id,
                                 param_bdjava_ptr, param_disc_id, param_disc_root,
                                 param_persistent_root, param_buda_root);

    if ((*env)->ExceptionOccurred(env)) {
        (*env)->ExceptionDescribe(env);
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Failed to initialize BD-J (uncaught exception)\n");
        (*env)->ExceptionClear(env);
        return 0;
    }

    (*env)->DeleteLocalRef(env, init_class);
    (*env)->DeleteLocalRef(env, param_disc_id);
    (*env)->DeleteLocalRef(env, param_disc_root);

    return 1;
}

int bdj_jvm_available(BDJ_STORAGE *storage)
{
    const char *java_home;
    void* jvm_lib = _load_jvm(&java_home);
    if (!jvm_lib) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "BD-J check: Failed to load JVM library\n");
        return 0;
    }
    dl_dlclose(jvm_lib);

    if (!_find_libbluray_jar(storage)) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "BD-J check: Failed to load libbluray.jar\n");
        return 1;
    }

    BD_DEBUG(DBG_BDJ, "BD-J check: OK\n");

    return 2;
}

static int _find_jvm(void *jvm_lib, JNIEnv **env, JavaVM **jvm)
{
    fptr_JNI_GetCreatedJavaVMs JNI_GetCreatedJavaVMs_fp = (fptr_JNI_GetCreatedJavaVMs)(intptr_t)dl_dlsym(jvm_lib, "JNI_GetCreatedJavaVMs");
    if (JNI_GetCreatedJavaVMs_fp == NULL) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Couldn't find symbol JNI_GetCreatedJavaVMs.\n");
        return 0;
    }

    jsize nVMs = 0;
    JavaVM* javavm = NULL;

    int result = JNI_GetCreatedJavaVMs_fp(&javavm, 1, &nVMs);
    if (result == JNI_OK && nVMs > 0) {
      *jvm = javavm;
      (**jvm)->AttachCurrentThread(*jvm, (void**)env, NULL);
      return 1;
    }

    return 0;
}

static int _create_jvm(void *jvm_lib, const char *java_home, const char *jar_file,
                       JNIEnv **env, JavaVM **jvm)
{
    (void)java_home;  /* used only with J2ME */

    fptr_JNI_CreateJavaVM JNI_CreateJavaVM_fp = (fptr_JNI_CreateJavaVM)(intptr_t)dl_dlsym(jvm_lib, "JNI_CreateJavaVM");
    if (JNI_CreateJavaVM_fp == NULL) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Couldn't find symbol JNI_CreateJavaVM.\n");
        return 0;
    }

    JavaVMOption* option = calloc(1, sizeof(JavaVMOption) * 20);
    if (!option) {
        BD_DEBUG(DBG_CRIT, "out of memory\n");
        return 0;
    }

    int n = 0;
    JavaVMInitArgs args;
    option[n++].optionString = str_dup   ("-Dawt.toolkit=java.awt.BDToolkit");
    option[n++].optionString = str_dup   ("-Djava.awt.graphicsenv=java.awt.BDGraphicsEnvironment");
    option[n++].optionString = str_printf("-Xbootclasspath/p:%s", jar_file);
    option[n++].optionString = str_dup   ("-Xms256M");
    option[n++].optionString = str_dup   ("-Xmx256M");
    option[n++].optionString = str_dup   ("-Xss2048k");
#ifdef HAVE_BDJ_J2ME
    option[n++].optionString = str_printf("-Djava.home=%s", java_home);
    option[n++].optionString = str_printf("-Xbootclasspath/a:%s/lib/xmlparser.jar", java_home);
    option[n++].optionString = str_dup   ("-XfullShutdown");
#endif

    /* JVM debug options */
    if (getenv("BDJ_JVM_DEBUG")) {
        option[n++].optionString = str_dup("-ea");
        //option[n++].optionString = str_dup("-verbose");
        //option[n++].optionString = str_dup("-verbose:class,gc,jni");
        option[n++].optionString = str_dup("-Xdebug");
        option[n++].optionString = str_dup("-Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n");
    }

#ifdef HAVE_BDJ_J2ME
    /*
      see: http://docs.oracle.com/javame/config/cdc/cdc-opt-impl/ojmeec/1.0/runtime/html/cvm.htm#CACBHBJB
      trace method execution: BDJ_JVM_TRACE=0x0002
      trace exceptions:       BDJ_JVM_TRACE=0x4000
    */
    if (getenv("BDJ_JVM_TRACE")) {
        option[n++].optionString = str_printf("-Xtrace:%s", getenv("BDJ_JVM_TRACE"));
    }
#endif

    args.version = JNI_VERSION_1_4;
    args.nOptions = n;
    args.options = option;
    args.ignoreUnrecognized = JNI_FALSE; // don't ignore unrecognized options

    int result = JNI_CreateJavaVM_fp(jvm, (void**) env, &args);

    while (--n >= 0) {
        X_FREE(option[n].optionString);
    }
    X_FREE(option);

    if (result != JNI_OK || !*env) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Failed to create new Java VM. JNI_CreateJavaVM result: %d\n", result);
        return 0;
    }

    return 1;
}

BDJAVA* bdj_open(const char *path, struct bluray *bd,
                 const char *bdj_disc_id, BDJ_STORAGE *storage)
{
    BD_DEBUG(DBG_BDJ, "bdj_open()\n");

    const char *jar_file = _find_libbluray_jar(storage);
    if (!jar_file) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "BD-J start failed: " BDJ_JARFILE " not found.\n");
        return NULL;
    }

    // first load the jvm using dlopen
    const char *java_home = NULL;
    void* jvm_lib = _load_jvm(&java_home);

    if (!jvm_lib) {
        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Wasn't able to load JVM\n");
        return 0;
    }

    BDJAVA* bdjava = calloc(1, sizeof(BDJAVA));
    if (!bdjava) {
        dl_dlclose(jvm_lib);
        return NULL;
    }

    JNIEnv* env = NULL;
    JavaVM *jvm = NULL;
    if (!_find_jvm(jvm_lib, &env, &jvm) &&
        !_create_jvm(jvm_lib, java_home, jar_file, &env, &jvm)) {

        X_FREE(bdjava);
        dl_dlclose(jvm_lib);
        return NULL;
    }

    bdjava->h_libjvm = jvm_lib;
    bdjava->jvm = jvm;

    if (debug_mask & DBG_JNI) {
        int version = (int)(*env)->GetVersion(env);
        BD_DEBUG(DBG_BDJ, "Java version: %d.%d\n", version >> 16, version & 0xffff);
    }

    if (!_bdj_init(env, bd, path, bdj_disc_id, storage)) {
        bdj_close(bdjava);
        return NULL;
    }

    /* detach java main thread (CreateJavaVM attachs calling thread to JVM) */
    (*bdjava->jvm)->DetachCurrentThread(bdjava->jvm);

    return bdjava;
}

void bdj_close(BDJAVA *bdjava)
{
    JNIEnv *env;
    int attach = 0;
    jclass shutdown_class;
    jmethodID shutdown_id;

    if (!bdjava) {
        return;
    }

    BD_DEBUG(DBG_BDJ, "bdj_close()\n");

    if (bdjava->jvm) {
        if ((*bdjava->jvm)->GetEnv(bdjava->jvm, (void**)&env, JNI_VERSION_1_4) != JNI_OK) {
            (*bdjava->jvm)->AttachCurrentThread(bdjava->jvm, (void**)&env, NULL);
            attach = 1;
        }

        if (_get_method(env, &shutdown_class, &shutdown_id,
                           "org/videolan/Libbluray", "shutdown", "()V")) {
            (*env)->CallStaticVoidMethod(env, shutdown_class, shutdown_id);

            if ((*env)->ExceptionOccurred(env)) {
                (*env)->ExceptionDescribe(env);
                BD_DEBUG(DBG_BDJ | DBG_CRIT, "Failed to shutdown BD-J (uncaught exception)\n");
                (*env)->ExceptionClear(env);
            }

            (*env)->DeleteLocalRef(env, shutdown_class);
        }

        bdj_unregister_native_methods(env);

        if (attach) {
            (*bdjava->jvm)->DetachCurrentThread(bdjava->jvm);
        }
    }

    if (bdjava->h_libjvm) {
        dl_dlclose(bdjava->h_libjvm);
    }

    X_FREE(bdjava);
}

int bdj_process_event(BDJAVA *bdjava, unsigned ev, unsigned param)
{
    static const char * const ev_name[] = {
        "NONE",
        "CHAPTER",
        "PLAYITEM",
        "ANGLE",
        "SUBTITLE",
        "END_OF_PLAYLIST",
        "PTS",
        "VK_KEY",
        "MARK",
        "PSR102",
        "PLAYLIST",

        "START",
        "STOP",

        "RATE",
        "AUDIO_STREAM",
        "SECONDARY_STREAM",
        "UO_MASKED",
    };

    JNIEnv* env;
    int attach = 0;
    jclass event_class;
    jmethodID event_id;
    int result = -1;

    if (!bdjava) {
        return -1;
    }

    // Disable too verbose logging (PTS)
    if (ev != BDJ_EVENT_PTS) {
        BD_DEBUG(DBG_BDJ, "bdj_process_event(%s,%d)\n", ev_name[ev], param);
    }

    if ((*bdjava->jvm)->GetEnv(bdjava->jvm, (void**)&env, JNI_VERSION_1_4) != JNI_OK) {
        (*bdjava->jvm)->AttachCurrentThread(bdjava->jvm, (void**)&env, NULL);
        attach = 1;
    }

    if (_get_method(env, &event_class, &event_id,
                       "org/videolan/Libbluray", "processEvent", "(II)Z")) {
        if ((*env)->CallStaticBooleanMethod(env, event_class, event_id, ev, param)) {
            result = 0;
        }

        if ((*env)->ExceptionOccurred(env)) {
            (*env)->ExceptionDescribe(env);
            BD_DEBUG(DBG_BDJ | DBG_CRIT, "bdj_process_event(%u,%u) failed (uncaught exception)\n", ev, param);
            (*env)->ExceptionClear(env);
        }

        (*env)->DeleteLocalRef(env, event_class);
    }

    if (attach) {
        (*bdjava->jvm)->DetachCurrentThread(bdjava->jvm);
    }

    return result;
}
