/*
 * Copyright (c) 2023 Huawei Device Co., Ltd.
 * 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.
 */

#include "event_queue.h"
#include "event_queue_base.h"
#include "eventqueueannex_fuzzer.h"
#include "securec.h"

namespace OHOS {
namespace {
    constexpr size_t U32_AT_SIZE = 4;
}

class MyFileDescriptorListener : public AppExecFwk::FileDescriptorListener {
public:
    MyFileDescriptorListener()
    {}
    ~MyFileDescriptorListener()
    {}

    /* @param int32_t fileDescriptor */
    void OnReadable(int32_t)
    {}

    /* @param int32_t fileDescriptor */
    void OnWritable(int32_t)
    {}

    /* @param int32_t fileDescriptor */
    void OnException(int32_t)
    {}

    MyFileDescriptorListener(const MyFileDescriptorListener &) = delete;
    MyFileDescriptorListener &operator=(const MyFileDescriptorListener &) = delete;
    MyFileDescriptorListener(MyFileDescriptorListener &&) = delete;
    MyFileDescriptorListener &operator=(MyFileDescriptorListener &&) = delete;
};

bool DoSomethingInterestingWithMyAPI(const char* data, size_t size)
{
    std::string stringData(data);
    std::shared_ptr<AppExecFwk::IoWaiter> ioWaiter = nullptr;
    AppExecFwk::EventQueueBase eventQueue(ioWaiter);
    std::shared_ptr<AppExecFwk::EventHandler> myHandler;
    uint32_t innerEventId = *data;
    int64_t param = U32_AT(reinterpret_cast<const uint8_t*>(data));
    eventQueue.HasInnerEvent(myHandler, innerEventId);
    eventQueue.Remove(myHandler);
    eventQueue.Remove(myHandler, innerEventId);
    eventQueue.Remove(myHandler, innerEventId, param);
    eventQueue.Remove(myHandler, stringData);
    int32_t fileDescriptor = U32_AT(reinterpret_cast<const uint8_t*>(data));
    auto fileDescriptorListener = std::make_shared<MyFileDescriptorListener>();
    eventQueue.AddFileDescriptorListener(fileDescriptor, innerEventId, fileDescriptorListener,
        "DoSomethingInterestingWithMyAPI");
    eventQueue.RemoveFileDescriptorListener(myHandler);
    eventQueue.RemoveFileDescriptorListener(fileDescriptor);
    eventQueue.RemoveOrphan();
    eventQueue.GetEvent();
    eventQueue.IsIdle();
    eventQueue.Prepare();
    eventQueue.Finish();
    return true;
}
}

/* Fuzzer entry point */
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
{
    /* Run your code on data */
    if (data == nullptr) {
        return 0;
    }

    if (size < OHOS::U32_AT_SIZE) {
        return 0;
    }

    char* ch = (char *)malloc(size + 1);
    if (ch == nullptr) {
        return 0;
    }

    (void)memset_s(ch, size + 1, 0x00, size + 1);
    if (memcpy_s(ch, size, data, size) != EOK) {
        free(ch);
        ch = nullptr;
        return 0;
    }

    OHOS::DoSomethingInterestingWithMyAPI(ch, size);
    free(ch);
    ch = nullptr;
    return 0;
}