/*
 * Copyright (c) 2014, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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 "Java.h"
#include "PlatformString.h"

#include <list>


//--------------------------------------------------------------------------------------------------

#ifdef DEBUG
TString JavaException::CreateExceptionMessage(JNIEnv* Env, jthrowable Exception,
    jmethodID GetCauseMethod, jmethodID GetStackTraceMethod, jmethodID ThrowableToTStringMethod,
    jmethodID FrameToTStringMethod) {

    TString result;
    jobjectArray frames = (jobjectArray)Env->CallObjectMethod(Exception, GetStackTraceMethod);

    // Append Throwable.toTString().
    if (0 != frames) {
        jstring jstr = (jstring)Env->CallObjectMethod(Exception, ThrowableToTStringMethod);
        const char* str = Env->GetStringUTFChars(jstr, 0);
        result += PlatformString(str).toPlatformString();
        Env->ReleaseStringUTFChars(jstr, str);
        Env->DeleteLocalRef(jstr);
    }

    // Append stack trace if one exists.
    if (Env->GetArrayLength(frames) > 0) {
        jsize i = 0;

        for (i = 0; i < Env->GetArrayLength(frames); i++) {
            // Get the string from the next frame and append it to
            // the error message.
            jobject frame = Env->GetObjectArrayElement(frames, i);
            jstring obj = (jstring)Env->CallObjectMethod(frame, FrameToTStringMethod);
            const char* str = Env->GetStringUTFChars(obj, 0);
            result += _T("\n  ");
            result += PlatformString(str).toPlatformString();
            Env->ReleaseStringUTFChars(obj, str);
            Env->DeleteLocalRef(obj);
            Env->DeleteLocalRef(frame);
        }
    }

    // If Exception has a cause then append the stack trace messages.
    if (0 != frames) {
        jthrowable cause = (jthrowable)Env->CallObjectMethod(Exception, GetCauseMethod);

        if (cause != NULL) {
            result += CreateExceptionMessage(Env, cause, GetCauseMethod,
                GetStackTraceMethod, ThrowableToTStringMethod,
                FrameToTStringMethod);
        }
    }

    return result;
}
#endif //DEBUG

JavaException::JavaException() : Exception() {}

//#ifdef WINDOWS
JavaException::JavaException(JNIEnv *Env, const TString Message) : Exception(Message) {
//#endif //WINDOWS
//#ifdef POSIX
//JavaException::JavaException(JNIEnv *Env, TString message) {
//#endif //POSIX

    FEnv = Env;
    FException = Env->ExceptionOccurred();
    Env->ExceptionClear();

#ifdef DEBUG
    Platform& platform = Platform::GetInstance();

    if (platform.GetDebugState() == dsNone) {
        jclass ThrowableClass = Env->FindClass("java/lang/Throwable");

        if (FEnv->ExceptionCheck() == JNI_TRUE) {
            Env->ExceptionClear();
            return;
        }

        jmethodID GetCauseMethod = Env->GetMethodID(ThrowableClass,
                                                    "getCause",
                                                    "()Ljava/lang/Throwable;");

        if (FEnv->ExceptionCheck() == JNI_TRUE) {
            Env->ExceptionClear();
            return;
        }

        jmethodID GetStackTraceMethod = Env->GetMethodID(ThrowableClass,
                                                            "getStackTrace",
                                                            "()[Ljava/lang/StackTraceElement;");

        if (FEnv->ExceptionCheck() == JNI_TRUE) {
            Env->ExceptionClear();
            return;
        }

        jmethodID ThrowableToTStringMethod = Env->GetMethodID(ThrowableClass,
                                                                "toString",
                                                                "()Ljava/lang/String;");

        if (FEnv->ExceptionCheck() == JNI_TRUE) {
            Env->ExceptionClear();
            return;
        }

        jclass FrameClass = Env->FindClass("java/lang/StackTraceElement");

        if (FEnv->ExceptionCheck() == JNI_TRUE) {
            Env->ExceptionClear();
            return;
        }

        jmethodID FrameToTStringMethod = Env->GetMethodID(FrameClass,
                                                            "toString",
                                                            "()Ljava/lang/String;");

        if (FEnv->ExceptionCheck() == JNI_TRUE) {
            Env->ExceptionClear();
            return;
        }

        TString lmessage = CreateExceptionMessage(Env, FException, GetCauseMethod,
            GetStackTraceMethod, ThrowableToTStringMethod, FrameToTStringMethod);
        SetMessage(lmessage);
    }
#endif //DEBUG
}

void JavaException::Rethrow() {
    FEnv->Throw(FException);
}

//--------------------------------------------------------------------------------------------------

JavaStaticMethod::JavaStaticMethod(JNIEnv *Env, jclass Class, jmethodID Method) {
    FEnv = Env;
    FClass = Class;
    FMethod = Method;
}

void JavaStaticMethod::CallVoidMethod(int Count, ...) {
    va_list args;
    va_start(args, Count);
    FEnv->CallStaticVoidMethodV(FClass, FMethod, args);
    va_end(args);

    if (FEnv->ExceptionCheck() == JNI_TRUE) {
        Messages& messages = Messages::GetInstance();
        throw JavaException(FEnv, messages.GetMessage(ERROR_INVOKING_METHOD));
    }
}

JavaStaticMethod::operator jmethodID () {
    return FMethod;
}

//--------------------------------------------------------------------------------------------------

JavaMethod::JavaMethod(JNIEnv *Env, jobject Obj, jmethodID Method) {
    FEnv = Env;
    FObj = Obj;
    FMethod = Method;
}

void JavaMethod::CallVoidMethod(int Count, ...) {
    va_list args;
    va_start(args, Count);
    FEnv->CallVoidMethodV(FObj, FMethod, args);
    va_end(args);

    if (FEnv->ExceptionCheck() == JNI_TRUE) {
        Messages& messages = Messages::GetInstance();
        throw JavaException(FEnv, messages.GetMessage(ERROR_INVOKING_METHOD));
    }
}

JavaMethod::operator jmethodID () {
    return FMethod;
}

//--------------------------------------------------------------------------------------------------

JavaClass::JavaClass(JNIEnv *Env, TString Name) {
    FEnv = Env;
    FClassName = Name;
    FClass = FEnv->FindClass(PlatformString(FClassName));

    if (FClass == NULL || FEnv->ExceptionCheck() == JNI_TRUE) {
        Messages& messages = Messages::GetInstance();
        TString message = messages.GetMessage(CLASS_NOT_FOUND);
        message = PlatformString::Format(message, FClassName.data());
        throw JavaException(FEnv, message);
    }
}

JavaClass::~JavaClass() {
    FEnv->DeleteLocalRef(FClass);

    if (FEnv->ExceptionCheck() == JNI_TRUE) {
        // throw JavaException(FEnv, _T("Error"));  // VS2017 - FIXME
    }
}

JavaStaticMethod JavaClass::GetStaticMethod(TString Name, TString Signature) {
    jmethodID method = FEnv->GetStaticMethodID(FClass, PlatformString(Name), PlatformString(Signature));

    if (method == NULL || FEnv->ExceptionCheck() == JNI_TRUE) {
        Messages& messages = Messages::GetInstance();
        TString message = messages.GetMessage(METHOD_NOT_FOUND);
        message = PlatformString::Format(message, Name.data(), FClassName.data());
        throw JavaException(FEnv, message);
    }

    return JavaStaticMethod(FEnv, FClass, method);
}

JavaClass::operator jclass () {
    return FClass;
}

//--------------------------------------------------------------------------------------------------

void JavaStringArray::Initialize(size_t Size) {
    JavaClass jstringClass(FEnv, _T("java/lang/String"));

    if (FEnv->ExceptionCheck() == JNI_TRUE) {
        Messages& messages = Messages::GetInstance();
        TString message = messages.GetMessage(CLASS_NOT_FOUND);
        message = PlatformString::Format(message, _T("String"));
        throw JavaException(FEnv, message.data());
    }

    jstring str = PlatformString("").toJString(FEnv);
    FData = (jobjectArray)FEnv->NewObjectArray((jsize)Size, jstringClass, str);

    if (FEnv->ExceptionCheck() == JNI_TRUE) {
        throw JavaException(FEnv, _T("Error"));
    }
}

JavaStringArray::JavaStringArray(JNIEnv *Env, size_t Size) {
    FEnv = Env;
    Initialize(Size);
}

JavaStringArray::JavaStringArray(JNIEnv *Env, jobjectArray Data) {
    FEnv = Env;
    FData = Data;
}

JavaStringArray::JavaStringArray(JNIEnv *Env, std::list<TString> Items) {
    FEnv = Env;
    Initialize(Items.size());
    unsigned int index = 0;

    for (std::list<TString>::const_iterator iterator = Items.begin(); iterator != Items.end(); iterator++) {
        TString item = *iterator;
        SetValue(index, PlatformString(item).toJString(FEnv));
        index++;
    }
}

jobjectArray JavaStringArray::GetData() {
    return FData;
}

void JavaStringArray::SetValue(jsize Index, jstring Item) {
    FEnv->SetObjectArrayElement(FData, Index, Item);

    if (FEnv->ExceptionCheck() == JNI_TRUE) {
        throw JavaException(FEnv, _T("Error"));
    }
}

jstring JavaStringArray::GetValue(jsize Index) {
    jstring result = (jstring)FEnv->GetObjectArrayElement(FData, Index);

    if (FEnv->ExceptionCheck() == JNI_TRUE) {
        throw JavaException(FEnv, _T("Error"));
    }

    return result;
}

unsigned int JavaStringArray::Count() {
    unsigned int result = FEnv->GetArrayLength(FData);

    if (FEnv->ExceptionCheck() == JNI_TRUE) {
        throw JavaException(FEnv, _T("Error"));
    }

    return result;
}

//--------------------------------------------------------------------------------------------------