#pragma once

#include <utility>

#include "../../src/Exception.h"

#include "../../src/NativeConverter.hpp"

#include "../../src/Reference.h"

#include "../../src/Scope.h"

#include "../../src/utils/GlobalWeakBookkeeping.hpp"

#include "JscHelper.h"

namespace script {

namespace jsc_backend {

inline void retain(JSContextRef context, JSValueRef val) {

if (val) JSValueProtect(context, val);

}

inline void release(JSContextRef context, JSValueRef val) {

if (val) JSValueUnprotect(context, val);

}

struct JscBookKeepFetcher {

};

using BookKeep = ::script::internal::GlobalWeakBookkeeping::Helper<JscBookKeepFetcher>;

} // namespace jsc_backend

template <typename T>

Global<T>::Global() noexcept : val_() {}

template <typename T>

Global<T>::Global(const script::Local<T>& localReference)

: val_{localReference.val_, jsc_backend::currentEngine()} {

if (val_.ref_) jsc_backend::retain(val_.engine_->context_, val_.ref_);

jsc_backend::BookKeep::keep(this);

}

template <typename T>

Global<T>::Global(const script::Weak<T>& weak)

: val_{const_cast<typename jsc_backend::RefTypeMap<T>::jscType>(weak.val_.ref_.get()),

weak.val_.engine_} {

if (val_.ref_) jsc_backend::retain(val_.engine_->context_, val_.ref_);

jsc_backend::BookKeep::keep(this);

}

template <typename T>

Global<T>::Global(const script::Global<T>& copy) : val_() {

*this = copy;

}

template <typename T>

Global<T>::Global(script::Global<T>&& move) noexcept : val_() {

*this = std::move(move);

}

template <typename T>

Global<T>::~Global() {

if (!isEmpty()) {

EngineScope scope(val_.engine_);

reset();

}

}

template <typename T>

Global<T>& Global<T>::operator=(const script::Global<T>& assign) {

bool wasEmtpy = isEmpty();

if (!wasEmtpy) {

jsc_backend::release(val_.engine_->context_, val_.ref_);

}

val_.ref_ = assign.val_.ref_;

val_.engine_ = assign.val_.engine_;

if (val_.ref_) jsc_backend::retain(val_.engine_->context_, val_.ref_);

jsc_backend::BookKeep::afterCopy(wasEmtpy, this, &assign);

return *this;

}

template <typename T>

Global<T>& Global<T>::operator=(script::Global<T>&& move) noexcept {

bool wasEmtpy = isEmpty();

if (!wasEmtpy) {

wasEmtpy = false;

jsc_backend::release(val_.engine_->context_, val_.ref_);

}

val_.ref_ = move.val_.ref_;

val_.engine_ = move.val_.engine_;

move.val_.ref_ = nullptr;

move.val_.engine_ = nullptr;

jsc_backend::BookKeep::afterMove(wasEmtpy, this, &move);

return *this;

}

template <typename T>

void Global<T>::swap(Global& rhs) noexcept {

std::swap(val_.ref_, rhs.val_.ref_);

std::swap(val_.engine_, rhs.val_.engine_);

jsc_backend::BookKeep::afterSwap(this, &rhs);

}

template <typename T>

Global<T>& Global<T>::operator=(const script::Local<T>& assign) {

*this = Global<T>(assign);

return *this;

}

template <typename T>

Local<T> Global<T>::get() const {

if (isEmpty()) throw Exception("get on empty Global");

return Local<T>(val_.ref_);

}

template <typename T>

Local<Value> Global<T>::getValue() const {

return Local<Value>(val_.ref_);

}

template <typename T>

bool Global<T>::isEmpty() const {

return val_.ref_ == nullptr;

}

template <typename T>

void Global<T>::reset() {

if (!isEmpty()) {

jsc_backend::release(val_.engine_->context_, val_.ref_);

jsc_backend::BookKeep::remove(this);

val_.ref_ = nullptr;

val_.engine_ = nullptr;

}

}

template <typename T>

Weak<T>::Weak() noexcept : val_() {}

template <typename T>

Weak<T>::~Weak() {

if (!isEmpty()) {

EngineScope scope(val_.engine_);

reset();

}

}

template <typename T>

Weak<T>::Weak(const script::Local<T>& localReference)

: val_(localReference.val_, jsc_backend::currentEngine()) {

jsc_backend::BookKeep::keep(this);

}

template <typename T>

Weak<T>::Weak(const script::Global<T>& globalReference)

: val_(globalReference.val_.ref_, jsc_backend::currentEngine()) {

jsc_backend::BookKeep::keep(this);

}

template <typename T>

Weak<T>::Weak(const script::Weak<T>& copy) : val_() {

*this = copy;

}

template <typename T>

Weak<T>::Weak(script::Weak<T>&& move) noexcept : val_() {

*this = std::move(move);

}

template <typename T>

Weak<T>& Weak<T>::operator=(const script::Weak<T>& assign) {

bool wasEmtpy = isEmpty();

val_.ref_ = assign.val_.ref_;

val_.engine_ = assign.val_.engine_;

jsc_backend::BookKeep::afterCopy(wasEmtpy, this, &assign);

return *this;

}

template <typename T>

Weak<T>& Weak<T>::operator=(script::Weak<T>&& move) noexcept {

bool wasEmpty = isEmpty();

val_.ref_ = std::move(move.val_.ref_);

val_.engine_ = std::move(move.val_.engine_);

jsc_backend::BookKeep::afterMove(wasEmpty, this, &move);

return *this;

}

template <typename T>

void Weak<T>::swap(Weak& rhs) noexcept {

std::swap(val_.ref_, rhs.val_.ref_);

std::swap(val_.engine_, rhs.val_.engine_);

jsc_backend::BookKeep::afterSwap(this, &rhs);

}

template <typename T>

Weak<T>& Weak<T>::operator=(const script::Local<T>& assign) {

*this = Weak<T>(assign);

return *this;

}

template <typename T>

Local<T> Weak<T>::get() const {

auto value = getValue();

if (value.isNull()) throw Exception("get on empty Weak");

return converter::Converter<Local<T>>::toCpp(value);

}

template <typename T>

Local<Value> Weak<T>::getValue() const {

using type = typename jsc_backend::RefTypeMap<Value>::jscType;

return Local<Value>(const_cast<type>(val_.ref_.get()));

}

template <typename T>

bool Weak<T>::isEmpty() const {

return val_.ref_.isEmpty();

}

template <typename T>

void Weak<T>::reset() noexcept {

if (!isEmpty()) {

jsc_backend::BookKeep::remove(this);

val_.ref_.reset(val_.engine_);

val_.engine_ = nullptr;

}

}

} // namespace script