/*************************************************************************/
/*  java_class_wrapper.h                                                 */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
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#ifndef JAVA_CLASS_WRAPPER_H
#define JAVA_CLASS_WRAPPER_H

#include "core/reference.h"

#ifdef ANDROID_ENABLED
#include <android/log.h>
#include <jni.h>
#endif

#ifdef ANDROID_ENABLED
class JavaObject;
#endif

class JavaClass : public Reference {

	GDCLASS(JavaClass, Reference);

#ifdef ANDROID_ENABLED
	enum ArgumentType{

		ARG_TYPE_VOID,
		ARG_TYPE_BOOLEAN,
		ARG_TYPE_BYTE,
		ARG_TYPE_CHAR,
		ARG_TYPE_SHORT,
		ARG_TYPE_INT,
		ARG_TYPE_LONG,
		ARG_TYPE_FLOAT,
		ARG_TYPE_DOUBLE,
		ARG_TYPE_STRING, //special case
		ARG_TYPE_CLASS,
		ARG_ARRAY_BIT = 1 << 16,
		ARG_NUMBER_CLASS_BIT = 1 << 17,
		ARG_TYPE_MASK = (1 << 16) - 1
	};

	Map<StringName, Variant> constant_map;

	struct MethodInfo {

		bool _static;
		Vector<uint32_t> param_types;
		Vector<StringName> param_sigs;
		uint32_t return_type;
		jmethodID method;
	};

	_FORCE_INLINE_ static void _convert_to_variant_type(int p_sig, Variant::Type &r_type, float &likelihood) {

		likelihood = 1.0;
		r_type = Variant::NIL;

		switch (p_sig) {

			case ARG_TYPE_VOID: r_type = Variant::NIL; break;
			case ARG_TYPE_BOOLEAN | ARG_NUMBER_CLASS_BIT:
			case ARG_TYPE_BOOLEAN: r_type = Variant::BOOL; break;
			case ARG_TYPE_BYTE | ARG_NUMBER_CLASS_BIT:
			case ARG_TYPE_BYTE:
				r_type = Variant::INT;
				likelihood = 0.1;
				break;
			case ARG_TYPE_CHAR | ARG_NUMBER_CLASS_BIT:
			case ARG_TYPE_CHAR:
				r_type = Variant::INT;
				likelihood = 0.2;
				break;
			case ARG_TYPE_SHORT | ARG_NUMBER_CLASS_BIT:
			case ARG_TYPE_SHORT:
				r_type = Variant::INT;
				likelihood = 0.3;
				break;
			case ARG_TYPE_INT | ARG_NUMBER_CLASS_BIT:
			case ARG_TYPE_INT:
				r_type = Variant::INT;
				likelihood = 1.0;
				break;
			case ARG_TYPE_LONG | ARG_NUMBER_CLASS_BIT:
			case ARG_TYPE_LONG:
				r_type = Variant::INT;
				likelihood = 0.5;
				break;
			case ARG_TYPE_FLOAT | ARG_NUMBER_CLASS_BIT:
			case ARG_TYPE_FLOAT:
				r_type = Variant::REAL;
				likelihood = 1.0;
				break;
			case ARG_TYPE_DOUBLE | ARG_NUMBER_CLASS_BIT:
			case ARG_TYPE_DOUBLE:
				r_type = Variant::REAL;
				likelihood = 0.5;
				break;
			case ARG_TYPE_STRING: r_type = Variant::STRING; break;
			case ARG_TYPE_CLASS: r_type = Variant::OBJECT; break;
			case ARG_ARRAY_BIT | ARG_TYPE_VOID: r_type = Variant::NIL; break;
			case ARG_ARRAY_BIT | ARG_TYPE_BOOLEAN: r_type = Variant::ARRAY; break;
			case ARG_ARRAY_BIT | ARG_TYPE_BYTE:
				r_type = Variant::POOL_BYTE_ARRAY;
				likelihood = 1.0;
				break;
			case ARG_ARRAY_BIT | ARG_TYPE_CHAR:
				r_type = Variant::POOL_BYTE_ARRAY;
				likelihood = 0.5;
				break;
			case ARG_ARRAY_BIT | ARG_TYPE_SHORT:
				r_type = Variant::POOL_INT_ARRAY;
				likelihood = 0.3;
				break;
			case ARG_ARRAY_BIT | ARG_TYPE_INT:
				r_type = Variant::POOL_INT_ARRAY;
				likelihood = 1.0;
				break;
			case ARG_ARRAY_BIT | ARG_TYPE_LONG:
				r_type = Variant::POOL_INT_ARRAY;
				likelihood = 0.5;
				break;
			case ARG_ARRAY_BIT | ARG_TYPE_FLOAT:
				r_type = Variant::POOL_REAL_ARRAY;
				likelihood = 1.0;
				break;
			case ARG_ARRAY_BIT | ARG_TYPE_DOUBLE:
				r_type = Variant::POOL_REAL_ARRAY;
				likelihood = 0.5;
				break;
			case ARG_ARRAY_BIT | ARG_TYPE_STRING: r_type = Variant::POOL_STRING_ARRAY; break;
			case ARG_ARRAY_BIT | ARG_TYPE_CLASS: r_type = Variant::ARRAY; break;
		}
	}

	_FORCE_INLINE_ static bool _convert_object_to_variant(JNIEnv *env, jobject obj, Variant &var, uint32_t p_sig);

	bool _call_method(JavaObject *p_instance, const StringName &p_method, const Variant **p_args, int p_argcount, Variant::CallError &r_error, Variant &ret);

	friend class JavaClassWrapper;
	Map<StringName, List<MethodInfo> > methods;
	jclass _class;
#endif

public:
	virtual Variant call(const StringName &p_method, const Variant **p_args, int p_argcount, Variant::CallError &r_error);

	JavaClass();
};

class JavaObject : public Reference {

	GDCLASS(JavaObject, Reference);

#ifdef ANDROID_ENABLED
	Ref<JavaClass> base_class;
	friend class JavaClass;

	jobject instance;
#endif

public:
	virtual Variant call(const StringName &p_method, const Variant **p_args, int p_argcount, Variant::CallError &r_error);

#ifdef ANDROID_ENABLED
	JavaObject(const Ref<JavaClass> &p_base, jobject *p_instance);
	~JavaObject();
#endif
};

class JavaClassWrapper : public Object {

	GDCLASS(JavaClassWrapper, Object);

#ifdef ANDROID_ENABLED
	Map<String, Ref<JavaClass> > class_cache;
	friend class JavaClass;
	jclass activityClass;
	jmethodID findClass;
	jmethodID getDeclaredMethods;
	jmethodID getFields;
	jmethodID getParameterTypes;
	jmethodID getReturnType;
	jmethodID getModifiers;
	jmethodID getName;
	jmethodID Class_getName;
	jmethodID Field_getName;
	jmethodID Field_getModifiers;
	jmethodID Field_get;
	jmethodID Boolean_booleanValue;
	jmethodID Byte_byteValue;
	jmethodID Character_characterValue;
	jmethodID Short_shortValue;
	jmethodID Integer_integerValue;
	jmethodID Long_longValue;
	jmethodID Float_floatValue;
	jmethodID Double_doubleValue;
	jobject classLoader;

	bool _get_type_sig(JNIEnv *env, jobject obj, uint32_t &sig, String &strsig);
#endif

	static JavaClassWrapper *singleton;

protected:
	static void _bind_methods();

public:
	static JavaClassWrapper *get_singleton() { return singleton; }

	Ref<JavaClass> wrap(const String &p_class);

#ifdef ANDROID_ENABLED
	JavaClassWrapper(jobject p_activity = NULL);
#else
	JavaClassWrapper();
#endif
};

#endif // JAVA_CLASS_WRAPPER_H
