/****************************************************************************
 Copyright (c) 2010-2012 cocos2d-x.org
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2022 Xiamen Yaji Software Co., Ltd.

 http://www.cocos.com

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated engine source code (the "Software"), a limited,
 worldwide, royalty-free, non-assignable, revocable and non-exclusive license
 to use Cocos Creator solely to develop games on your target platforms. You shall
 not use Cocos Creator software for developing other software or tools that's
 used for developing games. You are not granted to publish, distribute,
 sublicense, and/or sell copies of Cocos Creator.

 The software or tools in this License Agreement are licensed, not sold.
 Xiamen Yaji Software Co., Ltd. reserves all rights not expressly granted to you.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
****************************************************************************/

#include "base/Ref.h"
#include "base/AutoreleasePool.h"
#include "base/Macros.h"

#if CC_REF_LEAK_DETECTION
    #include <algorithm> // std::find
#endif

namespace cc {

#if CC_REF_LEAK_DETECTION
static void trackRef(Ref *ref);
static void untrackRef(Ref *ref);
#endif

Ref::Ref()
: _referenceCount(1) // when the Ref is created, the reference count of it is 1
{
#if CC_REF_LEAK_DETECTION
    trackRef(this);
#endif
}

Ref::~Ref() {
#if CC_REF_LEAK_DETECTION
    if (_referenceCount != 0)
        untrackRef(this);
#endif
}

void Ref::retain() {
    CCASSERT(_referenceCount > 0, "reference count should be greater than 0");
    ++_referenceCount;
}

void Ref::release() {
    CCASSERT(_referenceCount > 0, "reference count should be greater than 0");
    --_referenceCount;

    if (_referenceCount == 0) {
#if defined(CC_DEBUG) && (CC_DEBUG > 0)
        auto *poolManager = PoolManager::getInstance();
        auto *currentPool = poolManager->getCurrentPool();
        if (currentPool && !currentPool->isClearing() && poolManager->isObjectInPools(this)) {
            // Trigger an assert if the reference count is 0 but the Ref is still in autorelease pool.
            // This happens when 'autorelease/release' were not used in pairs with 'new/retain'.
            //
            // Wrong usage (1):
            //
            // auto obj = Node::create();   // Ref = 1, but it's an autorelease Ref which means it was in the autorelease pool.
            // obj->autorelease();   // Wrong: If you wish to invoke autorelease several times, you should retain `obj` first.
            //
            // Wrong usage (2):
            //
            // auto obj = Node::create();
            // obj->release();   // Wrong: obj is an autorelease Ref, it will be released when clearing current pool.
            //
            // Correct usage (1):
            //
            // auto obj = Node::create();
            //                     |-   new Node();     // `new` is the pair of the `autorelease` of next line
            //                     |-   autorelease();  // The pair of `new Node`.
            //
            // obj->retain();
            // obj->autorelease();  // This `autorelease` is the pair of `retain` of previous line.
            //
            // Correct usage (2):
            //
            // auto obj = Node::create();
            // obj->retain();
            // obj->release();   // This `release` is the pair of `retain` of previous line.
            CCASSERT(false, "The reference shouldn't be 0 because it is still in autorelease pool.");
        }
#endif

#if CC_REF_LEAK_DETECTION
        untrackRef(this);
#endif
        delete this;
    }
}

Ref *Ref::autorelease() {
    PoolManager::getInstance()->getCurrentPool()->addObject(this);
    return this;
}

unsigned int Ref::getReferenceCount() const {
    return _referenceCount;
}

#if CC_REF_LEAK_DETECTION

static std::list<Ref *> __refAllocationList;

void Ref::printLeaks() {
    // Dump Ref object memory leaks
    if (__refAllocationList.empty()) {
        log("[memory] All Ref objects successfully cleaned up (no leaks detected).\n");
    } else {
        log("[memory] WARNING: %d Ref objects still active in memory.\n", (int)__refAllocationList.size());

        for (const auto &ref : __refAllocationList) {
            CC_ASSERT(ref);
            const char *type = typeid(*ref).name();
            log("[memory] LEAK: Ref object '%s' still active with reference count %d.\n", (type ? type : ""), ref->getReferenceCount());
        }
    }
}

static void trackRef(Ref *ref) {
    CCASSERT(ref, "Invalid parameter, ref should not be null!");

    // Create memory allocation record.
    __refAllocationList.push_back(ref);
}

static void untrackRef(Ref *ref) {
    auto iter = std::find(__refAllocationList.begin(), __refAllocationList.end(), ref);
    if (iter == __refAllocationList.end()) {
        log("[memory] CORRUPTION: Attempting to free (%s) with invalid ref tracking record.\n", typeid(*ref).name());
        return;
    }

    __refAllocationList.erase(iter);
}

#endif // #if CC_REF_LEAK_DETECTION

} // namespace cc