# Copyright (c) 2004-2020 Adam Karpierz
# Licensed under CC BY-NC-ND 4.0
# Licensed under proprietary License
# Please refer to the accompanying LICENSE file.

import jni

from .....jframe import JFrame
from .....jhost  import JHost
from .....jvm    import JVMException
from .....java   import throwJavaException


# Class: org.jt.reflect.ProxyHandler

# Method: native Object invoke(long target, Object proxy, java.lang.reflect.Method method, Object[] args);

@jni.method("(JLjava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;")
def invoke(env, this,
           target, jproxy, jmethod, jargs):
    proxy = jni.from_oid(target)
    jt_jvm = proxy._state.jt_jvm
    jvm, jenv = jt_jvm._jvm, env[0]
    try:
        method, args = None, []
        try:
            method = jt_jvm.JMethod(None, jmethod, own=False) if jmethod else None
            argcnt = jenv.GetArrayLength(jargs) if jargs else 0
            with JFrame(jenv, argcnt):
                for idx in range(argcnt):
                    jarg = jenv.GetObjectArrayElement(jargs, idx)
                    args.append(jt_jvm.JObject(None, jarg, own=False) if jarg else None)

                with JHost.CallbackState((jvm, jenv)):
                    result = proxy(method, *args)
                    if result is None:
                        return None
                    else:
                        if not isinstance(result, jt_jvm.JObject):
                            raise TypeError("Must be jvm.JObject")
                        return jenv.NewGlobalRef(result.handle)
        finally:
            del method, args
    except jni.Throwable as exc:
        jexc = jt_jvm.JException(exc)
        jexc.throw()
    except jni.JNIException as exc:
        throwJavaException(jenv, "java.lang.RuntimeException", exc.getMessage())
    except jt_jvm.JavaException as exc:
        jenv.Throw(jni.cast(exc.__javaobject__.handle, jni.jthrowable))
    except JVMException as exc:
        throwJavaException(jenv, "java.lang.RuntimeException", exc.args[1])
    except UnboundLocalError as exc:
        throwJavaException(jenv, "java.lang.NoSuchMethodError", exc)
    except Exception as exc:
        throwJavaException(jenv, "java.lang.RuntimeException",
                                 "Python exception thrown: {}".format(exc))
    return None

# Method: native void initialize(long target);

@jni.method("(J)V")
def initialize(env, this,
               target):
    proxy = jni.from_oid(target)
    jt_jvm = proxy._state.jt_jvm
    jvm, jenv = jt_jvm._jvm, env[0]
    with JHost.CallbackState((jvm, jenv)):
        JHost.incRef(proxy)

# Method: native void release(long target);

@jni.method("(J)V")
def release(env, this,
            target):
    proxy = jni.from_oid(target)
    jt_jvm = proxy._state.jt_jvm
    jvm, jenv = jt_jvm._jvm, env[0]
    with JHost.CallbackState((jvm, jenv)):
        JHost.decRef(proxy)


__jnimethods__ = (
    invoke,
    initialize,
    release,
)

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