/*
Copyright (c) 2015 - 2021 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
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.
*/

#pragma once

#include "concepts.hpp"
#include "helpers.hpp"
#include "program_state.hpp"
#include "hip_runtime_api.h"

#include <cstdint>
#include <cstring>
#include <stdexcept>
#include <tuple>
#include <type_traits>
#include <utility>

hipError_t ihipExtLaunchMultiKernelMultiDevice(hipLaunchParams* launchParamsList, int numDevices,
                                               unsigned int flags, hip_impl::program_state& ps);

hipError_t hipLaunchCooperativeKernel(const void* f, dim3 gridDim,
                                    dim3 blockDim, void** args,
                                    size_t sharedMem, hipStream_t stream,
                                    hip_impl::program_state& ps);

hipError_t hipLaunchCooperativeKernelMultiDevice(hipLaunchParams* launchParamsList,
                                                 int  numDevices,
                                                 unsigned int flags,
                                                 hip_impl::program_state& ps);

#pragma GCC visibility push(hidden)

namespace hip_impl {
template <typename T, typename std::enable_if<std::is_integral<T>{}>::type* = nullptr>
inline T round_up_to_next_multiple_nonnegative(T x, T y) {
    T tmp = x + y - 1;
    return tmp - tmp % y;
}

template <
    std::size_t n,
    typename... Ts,
    typename std::enable_if<n == sizeof...(Ts)>::type* = nullptr>
inline hip_impl::kernarg make_kernarg(
    const std::tuple<Ts...>&,
    const kernargs_size_align&,
    hip_impl::kernarg kernarg) {
    return kernarg;
}

template <
    std::size_t n,
    typename... Ts,
    typename std::enable_if<n != sizeof...(Ts)>::type* = nullptr>
inline hip_impl::kernarg make_kernarg(
    const std::tuple<Ts...>& formals,
    const kernargs_size_align& size_align,
    hip_impl::kernarg kernarg) {
    using T = typename std::tuple_element<n, std::tuple<Ts...>>::type;

    static_assert(
        !std::is_reference<T>{},
        "A __global__ function cannot have a reference as one of its "
            "arguments.");
    #if defined(HIP_STRICT)
        static_assert(
            std::is_trivially_copyable<T>{},
            "Only TriviallyCopyable types can be arguments to a __global__ "
                "function");
    #endif

    kernarg.resize(round_up_to_next_multiple_nonnegative(
        kernarg.size(), size_align.alignment(n)) + size_align.size(n));

    std::memcpy(
        kernarg.data() + kernarg.size() - size_align.size(n),
        &std::get<n>(formals),
        size_align.size(n));
    return make_kernarg<n + 1>(formals, size_align, std::move(kernarg));
}

template <typename... Formals, typename... Actuals>
inline hip_impl::kernarg make_kernarg(
    void (*kernel)(Formals...), std::tuple<Actuals...> actuals) {
    static_assert(sizeof...(Formals) == sizeof...(Actuals),
        "The count of formal arguments must match the count of actuals.");

    if (sizeof...(Formals) == 0) return {};

    std::tuple<Formals...> to_formals{std::move(actuals)};
    hip_impl::kernarg kernarg;
    kernarg.reserve(sizeof(to_formals));

    auto& ps = hip_impl::get_program_state();
    return make_kernarg<0>(to_formals, 
                           ps.get_kernargs_size_align(
                               reinterpret_cast<std::uintptr_t>(kernel)),
                           std::move(kernarg));
}


HIP_INTERNAL_EXPORTED_API hsa_agent_t target_agent(hipStream_t stream);

inline
__attribute__((visibility("hidden")))
void hipLaunchKernelGGLImpl(
    std::uintptr_t function_address,
    const dim3& numBlocks,
    const dim3& dimBlocks,
    std::uint32_t sharedMemBytes,
    hipStream_t stream,
    void** kernarg) {

    const auto& kd = hip_impl::get_program_state().kernel_descriptor(function_address, 
                                                               target_agent(stream));

    hipModuleLaunchKernel(kd, numBlocks.x, numBlocks.y, numBlocks.z,
                          dimBlocks.x, dimBlocks.y, dimBlocks.z, sharedMemBytes,
                          stream, nullptr, kernarg);
}
} // Namespace hip_impl.


template <class T>
inline
hipError_t hipOccupancyMaxPotentialBlockSize(int* gridSize, int* blockSize,
    T kernel, size_t dynSharedMemPerBlk = 0, int blockSizeLimit = 0) {

    using namespace hip_impl;

    hip_impl::hip_init();
    auto f = get_program_state().kernel_descriptor(reinterpret_cast<std::uintptr_t>(kernel),
                                                   target_agent(0));

    return hipModuleOccupancyMaxPotentialBlockSize(gridSize, blockSize, f,
                                      dynSharedMemPerBlk, blockSizeLimit);
}

template <class T>
inline
hipError_t hipOccupancyMaxPotentialBlockSizeWithFlags(int* gridSize, int* blockSize,
    T kernel, size_t dynSharedMemPerBlk = 0, int blockSizeLimit = 0, unsigned int  flags = 0 ) {

    using namespace hip_impl;

    hip_impl::hip_init();
    if(flags != hipOccupancyDefault) return hipErrorNotSupported;
    auto f = get_program_state().kernel_descriptor(reinterpret_cast<std::uintptr_t>(kernel),
                                                   target_agent(0));

    return hipModuleOccupancyMaxPotentialBlockSize(gridSize, blockSize, f,
                                      dynSharedMemPerBlk, blockSizeLimit);
}

template <typename... Args, typename F = void (*)(Args...)>
inline
void hipLaunchKernelGGL(F kernel, const dim3& numBlocks, const dim3& dimBlocks,
                        std::uint32_t sharedMemBytes, hipStream_t stream,
                        Args... args) {
    hip_impl::hip_init();
    auto kernarg = hip_impl::make_kernarg(kernel, std::tuple<Args...>{std::move(args)...});
    std::size_t kernarg_size = kernarg.size();

    void* config[]{
        HIP_LAUNCH_PARAM_BUFFER_POINTER,
        kernarg.data(),
        HIP_LAUNCH_PARAM_BUFFER_SIZE,
        &kernarg_size,
        HIP_LAUNCH_PARAM_END};

    hip_impl::hipLaunchKernelGGLImpl(reinterpret_cast<std::uintptr_t>(kernel),
                                     numBlocks, dimBlocks, sharedMemBytes,
                                     stream, &config[0]);
}

template <typename F>
inline
__attribute__((visibility("hidden")))
hipError_t hipLaunchCooperativeKernel(F f, dim3 gridDim, dim3 blockDim,
                                      void** args, size_t sharedMem,
                                      hipStream_t stream) {
    hip_impl::hip_init();
    auto& ps = hip_impl::get_program_state();
    return hipLaunchCooperativeKernel(reinterpret_cast<void*>(f), gridDim,
                                      blockDim, args, sharedMem, stream, ps);
}

inline
__attribute__((visibility("hidden")))
hipError_t hipLaunchCooperativeKernelMultiDevice(hipLaunchParams* launchParamsList,
                                                 int  numDevices,
                                                 unsigned int  flags) {

    hip_impl::hip_init();
    auto& ps = hip_impl::get_program_state();
    return hipLaunchCooperativeKernelMultiDevice(launchParamsList, numDevices, flags, ps);
}

#pragma GCC visibility pop