/*******************************************************************************
 *
 * MIT License
 *
 * Copyright (C) 2021-2025 Advanced Micro Devices, Inc. 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
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 *******************************************************************************/

#pragma once

#include "common.hpp"
#include <memory>

// The HipResource class is intended as a wrapper for allocation, deletion and copying
// between host and device resources using the HIP backend.
// Memory is treated as a 1D array, and is managed through the std::unique_ptr class.

namespace hiptensor
{

    struct HipResource
    {
    protected:
        HipResource() = default;

    private: // No Copy
        HipResource(HipResource&&)                 = delete;
        HipResource(const HipResource&)            = delete;
        HipResource& operator=(const HipResource&) = delete;

    public:
        virtual ~HipResource() = default;

        // Types
        using DevicePtrT = std::unique_ptr<void, DeviceDeleter>;
        using HostPtrT   = std::unique_ptr<void, HostDeleter>;

        // Alloc
        static DevicePtrT allocDevice(int64_t numBytes);
        static void       reallocDevice(DevicePtrT& devicePtr, int64_t numBytes);
        static HostPtrT   allocHost(int64_t numBytes);
        static void       reallocHost(HostPtrT& hostPtr, int64_t numBytes);
        static void
            reallocDeviceHostPair(DevicePtrT& devicePtr, HostPtrT& hostPtr, int64_t numBytes);

        // Transfer wrappers
        static void copyData(HostPtrT& dst, DevicePtrT const& src, int64_t numBytes);
        static void copyData(DevicePtrT& dst, HostPtrT const& src, int64_t numBytes);
        static void copyData(HostPtrT& dst, HostPtrT const& src, int64_t numBytes);
        static void copyData(DevicePtrT& dst, DevicePtrT const& src, int64_t numBytes);

        virtual void reset() = 0;
    };

} // namespace hiptensor