// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// The MIT License (MIT)
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// Copyright (c) 2018-2021 www.open3d.org
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#include "open3d/core/kernel/UnaryEW.h"

#include "open3d/core/ShapeUtil.h"
#include "open3d/core/Tensor.h"
#include "open3d/utility/Logging.h"

namespace open3d {
namespace core {
namespace kernel {

void UnaryEW(const Tensor& src, Tensor& dst, UnaryEWOpCode op_code) {
    // Check shape
    if (!shape_util::CanBeBrocastedToShape(src.GetShape(), dst.GetShape())) {
        utility::LogError("Shape {} can not be broadcasted to {}.",
                          src.GetShape(), dst.GetShape());
    }

    // Dispatch to device
    Device src_device = src.GetDevice();
    Device dst_device = dst.GetDevice();
    if (src_device != dst_device) {
        utility::LogError("Source device {} != destination device {}.",
                          src_device.ToString(), dst_device.ToString());
    }

    if (src_device.GetType() == Device::DeviceType::CPU) {
        UnaryEWCPU(src, dst, op_code);
    } else if (src_device.GetType() == Device::DeviceType::CUDA) {
#ifdef BUILD_CUDA_MODULE
        UnaryEWCUDA(src, dst, op_code);
#else
        utility::LogError("Not compiled with CUDA, but CUDA device is used.");
#endif
    } else {
        utility::LogError("UnaryEW Unimplemented device");
    }
}

void Copy(const Tensor& src, Tensor& dst) {
    // Check shape
    if (!shape_util::CanBeBrocastedToShape(src.GetShape(), dst.GetShape())) {
        utility::LogError("Shape {} can not be broadcasted to {}.",
                          src.GetShape(), dst.GetShape());
    }

    // Disbatch to device
    Device::DeviceType src_device_type = src.GetDevice().GetType();
    Device::DeviceType dst_device_type = dst.GetDevice().GetType();
    if ((src_device_type != Device::DeviceType::CPU &&
         src_device_type != Device::DeviceType::CUDA) ||
        (dst_device_type != Device::DeviceType::CPU &&
         dst_device_type != Device::DeviceType::CUDA)) {
        utility::LogError("Copy: Unimplemented device");
    }
    if (src_device_type == Device::DeviceType::CPU &&
        dst_device_type == Device::DeviceType::CPU) {
        CopyCPU(src, dst);
    } else {
#ifdef BUILD_CUDA_MODULE
        CopyCUDA(src, dst);
#else
        utility::LogError("Not compiled with CUDA, but CUDA device is used.");
#endif
    }
}

}  // namespace kernel
}  // namespace core
}  // namespace open3d
