/**
 * MIT License
 *
 * Copyright (c) 2025 Huawei Technologies Co., Ltd. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * 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 "ibuffered_device.h"
#include "logger/logger.h"
#include "thread/latch.h"
#include "thread/thread_pool.h"

namespace UC {
class SimuDevice : public IBufferedDevice {
    using Task = std::function<void(void)>;

public:
    SimuDevice(const int32_t deviceId, const size_t bufferSize, const size_t bufferNumber)
        : IBufferedDevice{deviceId, bufferSize, bufferNumber}
    {
    }
    Status Setup() override
    {
        auto status = IBufferedDevice::Setup();
        if (status.Failure()) { return status; }
        if (!this->backend_.SetWorkerFn([](auto& task, const auto&) { task(); }).Run()) {
            return Status::Error();
        }
        return Status::OK();
    }
    Status H2DSync(std::byte* dst, const std::byte* src, const size_t count) override
    {
        std::copy(src, src + count, dst);
        return Status::OK();
    }
    Status D2HSync(std::byte* dst, const std::byte* src, const size_t count) override
    {
        std::copy(src, src + count, dst);
        return Status::OK();
    }
    Status H2DAsync(std::byte* dst, const std::byte* src, const size_t count) override
    {
        if (dst == nullptr || src == nullptr || count == 0) {
            UC_ERROR("Invalid params: count={}.", count);
            return Status::InvalidParam();
        }
        this->backend_.Push([=] { std::copy(src, src + count, dst); });
        return Status::OK();
    }
    Status D2HAsync(std::byte* dst, const std::byte* src, const size_t count) override
    {
        if (dst == nullptr || src == nullptr || count == 0) {
            UC_ERROR("Invalid params: count={}.", count);
            return Status::InvalidParam();
        }
        this->backend_.Push([=] { std::copy(src, src + count, dst); });
        return Status::OK();
    }
    Status AppendCallback(std::function<void(bool)> cb) override
    {
        this->backend_.Push([=] { cb(true); });
        return Status::OK();
    }
    Status Synchronized() override
    {
        Latch waiter;
        waiter.Up();
        this->backend_.Push([&] { waiter.Done(nullptr); });
        waiter.Wait();
        return Status::OK();
    }
    Status H2DBatchSync(std::byte* dArr[], const std::byte* hArr[], const size_t number,
                        const size_t count) override
    {
        for (size_t i = 0; i < number; i++) {
            auto status = this->H2DSync(dArr[i], hArr[i], count);
            if (status.Failure()) { return status; }
        }
        return Status::OK();
    }
    Status D2HBatchSync(std::byte* hArr[], const std::byte* dArr[], const size_t number,
                        const size_t count) override
    {
        for (size_t i = 0; i < number; i++) {
            auto status = this->D2HSync(hArr[i], dArr[i], count);
            if (status.Failure()) { return status; }
        }
        return Status::OK();
    }

protected:
    std::shared_ptr<std::byte> MakeBuffer(const size_t size) override
    {
        return std::shared_ptr<std::byte>((std::byte*)malloc(size), free);
    }

private:
    ThreadPool<Task> backend_;
};

std::unique_ptr<IDevice> DeviceFactory::Make(const int32_t deviceId, const size_t bufferSize,
                                             const size_t bufferNumber)
{
    try {
        return std::make_unique<SimuDevice>(deviceId, bufferSize, bufferNumber);
    } catch (const std::exception& e) {
        UC_ERROR("Failed({}) to make simu device({},{},{}).", e.what(), deviceId, bufferSize,
                 bufferNumber);
        return nullptr;
    }
}

} // namespace UC
