/*
 * Tencent is pleased to support the open source community by making ScriptX available.
 * Copyright (C) 2021 THL A29 Limited, a Tencent company.  All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once
#include <utility>
#include "../../src/Reference.h"

namespace script {

template <typename T>
Global<T>::Global() noexcept : val_(-1) {}

template <typename T>
Global<T>::Global(const script::Local<T>& localReference) {
  val_ = wasm_backend::GlobalHelper::newGlobal(localReference.val_, false);
}

template <typename T>
Global<T>::Global(const script::Weak<T>& weak) : val_(-1) {
  val_ = wasm_backend::GlobalHelper::dupGlobal(weak.val_, true, false);
}

template <typename T>
Global<T>::Global(const script::Global<T>& copy) : val_(-1) {
  val_ = wasm_backend::GlobalHelper::dupGlobal(copy.val_, false, false);
}

template <typename T>
Global<T>::Global(script::Global<T>&& move) noexcept : val_(move.val_) {
  move.val_ = -1;
}

template <typename T>
Global<T>::~Global() {
  reset();
}

template <typename T>
Global<T>& Global<T>::operator=(const script::Global<T>& assign) {
  Global(assign).swap(*this);
  return *this;
}

template <typename T>
Global<T>& Global<T>::operator=(script::Global<T>&& move) noexcept {
  Global(std::move(move)).swap(*this);
  return *this;
}

template <typename T>
void Global<T>::swap(Global& rhs) noexcept {
  std::swap(val_, rhs.val_);
}

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 null Global");
  }
  return Local<T>(wasm_backend::GlobalHelper::getGlobal(val_, false));
}

template <typename T>
Local<Value> Global<T>::getValue() const {
  return Local<Value>(wasm_backend::GlobalHelper::getGlobal(val_, false));
}

template <typename T>
bool Global<T>::isEmpty() const {
  return val_ == -1;
}

template <typename T>
void Global<T>::reset() {
  if (!isEmpty()) {
    wasm_backend::GlobalHelper::deleteGlobal(val_, false);
    val_ = -1;
  }
}

// == Weak ==

template <typename T>
Weak<T>::Weak() noexcept : val_(-1) {}

template <typename T>
Weak<T>::~Weak() {
  reset();
}

template <typename T>
Weak<T>::Weak(const script::Local<T>& localReference) {
  val_ = wasm_backend::GlobalHelper::newGlobal(localReference.val_, true);
}

template <typename T>
Weak<T>::Weak(const script::Global<T>& globalReference) {
  val_ = wasm_backend::GlobalHelper::dupGlobal(globalReference.val_, false, true);
}

template <typename T>
Weak<T>::Weak(const script::Weak<T>& copy) : val_(copy.val_) {
  val_ = wasm_backend::GlobalHelper::dupGlobal(copy.val_, true, true);
}

template <typename T>
Weak<T>::Weak(script::Weak<T>&& move) noexcept : val_(std::move(move.val_)) {
  move.val_ = -1;
}

template <typename T>
Weak<T>& Weak<T>::operator=(const script::Weak<T>& assign) {
  val_ = assign.val_;
  return *this;
}

template <typename T>
Weak<T>& Weak<T>::operator=(script::Weak<T>&& move) noexcept {
  Weak(std::move(move)).swap(*this);
  return *this;
}

template <typename T>
void Weak<T>::swap(Weak& rhs) noexcept {
  std::swap(val_, rhs.val_);
}

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 {
  if (isEmpty()) {
    throw Exception("get on null Weak");
  }
  return Local<T>(wasm_backend::GlobalHelper::getGlobal(val_, true));
}

template <typename T>
Local<Value> Weak<T>::getValue() const {
  return Local<Value>(wasm_backend::GlobalHelper::getGlobal(val_, true));
}

template <typename T>
bool Weak<T>::isEmpty() const {
  return val_ == -1;
}

template <typename T>
void Weak<T>::reset() noexcept {
  if (!isEmpty()) {
    wasm_backend::GlobalHelper::deleteGlobal(val_, true);
    val_ = -1;
  }
}

}  // namespace script