//
// Copyright (c) 2017 The Khronos Group Inc.
//
// 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 "common.h"
#include "function_list.h"
#include "test_functions.h"
#include "utility.h"

#include <cinttypes>
#include <cstring>

namespace {

cl_int BuildKernelFn(cl_uint job_id, cl_uint thread_id UNUSED, void *p)
{
    BuildKernelInfo &info = *(BuildKernelInfo *)p;
    auto generator = [](const std::string &kernel_name, const char *builtin,
                        cl_uint vector_size_index) {
        return GetUnaryKernel(kernel_name, builtin, ParameterType::Double,
                              ParameterType::ULong, vector_size_index);
    };
    return BuildKernels(info, job_id, generator);
}

cl_ulong random64(MTdata d)
{
    return (cl_ulong)genrand_int32(d) | ((cl_ulong)genrand_int32(d) << 32);
}

} // anonymous namespace

int TestFunc_Double_ULong(const Func *f, MTdata d, bool relaxedMode)
{
    int error;
    Programs programs;
    const unsigned thread_id = 0; // Test is currently not multithreaded.
    KernelMatrix kernels;
    float maxError = 0.0f;
    int ftz = f->ftz || gForceFTZ;
    double maxErrorVal = 0.0f;
    uint64_t step = getTestStep(sizeof(cl_double), BUFFER_SIZE);

    logFunctionInfo(f->name, sizeof(cl_double), relaxedMode);

    Force64BitFPUPrecision();

    // Init the kernels
    BuildKernelInfo build_info{ 1, kernels, programs, f->nameInCode,
                                relaxedMode };
    if ((error = ThreadPool_Do(BuildKernelFn,
                               gMaxVectorSizeIndex - gMinVectorSizeIndex,
                               &build_info)))
        return error;

    for (uint64_t i = 0; i < (1ULL << 32); i += step)
    {
        // Init input array
        cl_ulong *p = (cl_ulong *)gIn;
        for (size_t j = 0; j < BUFFER_SIZE / sizeof(cl_ulong); j++)
            p[j] = random64(d);

        if ((error = clEnqueueWriteBuffer(gQueue, gInBuffer, CL_FALSE, 0,
                                          BUFFER_SIZE, gIn, 0, NULL, NULL)))
        {
            vlog_error("\n*** Error %d in clEnqueueWriteBuffer ***\n", error);
            return error;
        }

        // Write garbage into output arrays
        for (auto j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++)
        {
            uint32_t pattern = 0xffffdead;
            if (gHostFill)
            {
                memset_pattern4(gOut[j], &pattern, BUFFER_SIZE);
                if ((error = clEnqueueWriteBuffer(gQueue, gOutBuffer[j],
                                                  CL_FALSE, 0, BUFFER_SIZE,
                                                  gOut[j], 0, NULL, NULL)))
                {
                    vlog_error(
                        "\n*** Error %d in clEnqueueWriteBuffer2(%d) ***\n",
                        error, j);
                    return error;
                }
            }
            else
            {
                if ((error = clEnqueueFillBuffer(gQueue, gOutBuffer[j],
                                                 &pattern, sizeof(pattern), 0,
                                                 BUFFER_SIZE, 0, NULL, NULL)))
                {
                    vlog_error("Error: clEnqueueFillBuffer failed! err: %d\n",
                               error);
                    return error;
                }
            }
        }

        // Run the kernels
        for (auto j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++)
        {
            size_t vectorSize = sizeValues[j] * sizeof(cl_double);
            size_t localCount = (BUFFER_SIZE + vectorSize - 1) / vectorSize;
            if ((error = clSetKernelArg(kernels[j][thread_id], 0,
                                        sizeof(gOutBuffer[j]), &gOutBuffer[j])))
            {
                LogBuildError(programs[j]);
                return error;
            }
            if ((error = clSetKernelArg(kernels[j][thread_id], 1,
                                        sizeof(gInBuffer), &gInBuffer)))
            {
                LogBuildError(programs[j]);
                return error;
            }

            if ((error = clEnqueueNDRangeKernel(gQueue, kernels[j][thread_id],
                                                1, NULL, &localCount, NULL, 0,
                                                NULL, NULL)))
            {
                vlog_error("FAILED -- could not execute kernel\n");
                return error;
            }
        }

        // Get that moving
        if ((error = clFlush(gQueue))) vlog("clFlush failed\n");

        // Calculate the correctly rounded reference result
        double *r = (double *)gOut_Ref;
        cl_ulong *s = (cl_ulong *)gIn;
        for (size_t j = 0; j < BUFFER_SIZE / sizeof(cl_double); j++)
            r[j] = (double)f->dfunc.f_u(s[j]);

        // Read the data back
        for (auto j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++)
        {
            if ((error =
                     clEnqueueReadBuffer(gQueue, gOutBuffer[j], CL_TRUE, 0,
                                         BUFFER_SIZE, gOut[j], 0, NULL, NULL)))
            {
                vlog_error("ReadArray failed %d\n", error);
                return error;
            }
        }

        if (gSkipCorrectnessTesting) break;

        // Verify data
        uint64_t *t = (uint64_t *)gOut_Ref;
        for (size_t j = 0; j < BUFFER_SIZE / sizeof(cl_double); j++)
        {
            for (auto k = gMinVectorSizeIndex; k < gMaxVectorSizeIndex; k++)
            {
                uint64_t *q = (uint64_t *)(gOut[k]);

                // If we aren't getting the correctly rounded result
                if (t[j] != q[j])
                {
                    double test = ((double *)q)[j];
                    long double correct = f->dfunc.f_u(s[j]);
                    float err = Bruteforce_Ulp_Error_Double(test, correct);
                    int fail = !(fabsf(err) <= f->double_ulps);

                    if (fail)
                    {
                        if (ftz || relaxedMode)
                        {
                            // retry per section 6.5.3.2
                            if (IsDoubleResultSubnormal(correct,
                                                        f->double_ulps))
                            {
                                fail = fail && (test != 0.0);
                                if (!fail) err = 0.0f;
                            }
                        }
                    }
                    if (fabsf(err) > maxError)
                    {
                        maxError = fabsf(err);
                        maxErrorVal = s[j];
                    }
                    if (fail)
                    {
                        vlog_error(
                            "\n%s%sD: %f ulp error at 0x%16.16" PRIx64 ": "
                            "*%.13la vs. %.13la\n",
                            f->name, sizeNames[k], err, ((uint64_t *)gIn)[j],
                            ((double *)gOut_Ref)[j], test);
                        return -1;
                    }
                }
            }
        }

        if (0 == (i & 0x0fffffff))
        {
            if (gVerboseBruteForce)
            {
                vlog("base:%14" PRIu64 " step:%10" PRIu64
                     "  bufferSize:%10d \n",
                     i, step, BUFFER_SIZE);
            }
            else
            {
                vlog(".");
            }
            fflush(stdout);
        }
    }

    if (!gSkipCorrectnessTesting)
    {
        if (gWimpyMode)
            vlog("Wimp pass");
        else
            vlog("passed");

        vlog("\t%8.2f @ %a", maxError, maxErrorVal);
    }

    vlog("\n");

    return CL_SUCCESS;
}
