//
// Copyright (c) 2017-2024 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 <cstring>

namespace {

cl_int BuildKernel_HalfFn(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 GetBinaryKernel(kernel_name, builtin, ParameterType::Short,
                               ParameterType::Half, ParameterType::Half,
                               vector_size_index);
    };
    return BuildKernels(info, job_id, generator);
}

struct ThreadInfo
{
    clMemWrapper inBuf; // input buffer for the thread
    clMemWrapper inBuf2; // input buffer for the thread
    clMemWrapper outBuf[VECTOR_SIZE_COUNT]; // output buffers for the thread
    MTdataHolder d;
    clCommandQueueWrapper
        tQueue; // per thread command queue to improve performance
};

struct TestInfoBase
{
    size_t subBufferSize; // Size of the sub-buffer in elements
    const Func *f; // A pointer to the function info

    cl_uint threadCount; // Number of worker threads
    cl_uint jobCount; // Number of jobs
    cl_uint step; // step between each chunk and the next.
    cl_uint scale; // stride between individual test values
    int ftz; // non-zero if running in flush to zero mode
};

struct TestInfo : public TestInfoBase
{
    TestInfo(const TestInfoBase &base): TestInfoBase(base) {}

    // Array of thread specific information
    std::vector<ThreadInfo> tinfo;

    // Programs for various vector sizes.
    Programs programs;

    // Thread-specific kernels for each vector size:
    // k[vector_size][thread_id]
    KernelMatrix k;
};

// A table of more difficult cases to get right
const cl_half specialValuesHalf[] = {
    0xffff, 0x0000, 0x0001, 0x7c00, /*INFINITY*/
    0xfc00, /*-INFINITY*/
    0x8000, /*-0*/
    0x7bff, /*HALF_MAX*/
    0x0400, /*HALF_MIN*/
    0x03ff, /* Largest denormal */
    0x3c00, /* 1 */
    0xbc00, /* -1 */
    0x3555, /*nearest value to 1/3*/
    0x3bff, /*largest number less than one*/
    0xc000, /* -2 */
    0xfbff, /* -HALF_MAX */
    0x8400, /* -HALF_MIN */
    0x4248, /* M_PI_H */
    0xc248, /* -M_PI_H */
    0xbbff, /* Largest negative fraction */
};

constexpr size_t specialValuesHalfCount = ARRAY_SIZE(specialValuesHalf);

cl_int TestHalf(cl_uint job_id, cl_uint thread_id, void *data)
{
    TestInfo *job = (TestInfo *)data;
    size_t buffer_elements = job->subBufferSize;
    size_t buffer_size = buffer_elements * sizeof(cl_half);
    cl_uint base = job_id * (cl_uint)job->step;
    ThreadInfo *tinfo = &(job->tinfo[thread_id]);
    fptr func = job->f->func;
    int ftz = job->ftz;
    MTdata d = tinfo->d;
    cl_uint j, k;
    cl_int error;
    const char *name = job->f->name;
    cl_short *t, *r;
    std::vector<float> s(0), s2(0);

    // start the map of the output arrays
    cl_event e[VECTOR_SIZE_COUNT];
    cl_short *out[VECTOR_SIZE_COUNT];

    if (gHostFill)
    {
        // start the map of the output arrays
        for (j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++)
        {
            out[j] = (cl_short *)clEnqueueMapBuffer(
                tinfo->tQueue, tinfo->outBuf[j], CL_FALSE, CL_MAP_WRITE, 0,
                buffer_size, 0, NULL, e + j, &error);
            if (error || NULL == out[j])
            {
                vlog_error("Error: clEnqueueMapBuffer %d failed! err: %d\n", j,
                           error);
                return error;
            }
        }

        // Get that moving
        if ((error = clFlush(tinfo->tQueue))) vlog("clFlush failed\n");
    }

    // Init input array
    cl_ushort *p = (cl_ushort *)gIn + thread_id * buffer_elements;
    cl_ushort *p2 = (cl_ushort *)gIn2 + thread_id * buffer_elements;
    j = 0;
    int totalSpecialValueCount =
        specialValuesHalfCount * specialValuesHalfCount;
    int indx = (totalSpecialValueCount - 1) / buffer_elements;

    if (job_id <= (cl_uint)indx)
    { // test edge cases
        uint32_t x, y;

        x = (job_id * buffer_elements) % specialValuesHalfCount;
        y = (job_id * buffer_elements) / specialValuesHalfCount;

        for (; j < buffer_elements; j++)
        {
            p[j] = specialValuesHalf[x];
            p2[j] = specialValuesHalf[y];
            if (++x >= specialValuesHalfCount)
            {
                x = 0;
                y++;
                if (y >= specialValuesHalfCount) break;
            }
        }
    }

    // Init any remaining values.
    for (; j < buffer_elements; j++)
    {
        p[j] = (cl_ushort)genrand_int32(d);
        p2[j] = (cl_ushort)genrand_int32(d);
    }


    if ((error = clEnqueueWriteBuffer(tinfo->tQueue, tinfo->inBuf, CL_FALSE, 0,
                                      buffer_size, p, 0, NULL, NULL)))
    {
        vlog_error("Error: clEnqueueWriteBuffer failed! err: %d\n", error);
        return error;
    }

    if ((error = clEnqueueWriteBuffer(tinfo->tQueue, tinfo->inBuf2, CL_FALSE, 0,
                                      buffer_size, p2, 0, NULL, NULL)))
    {
        vlog_error("Error: clEnqueueWriteBuffer failed! err: %d\n", error);
        return error;
    }

    for (j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++)
    {
        if (gHostFill)
        {
            // Wait for the map to finish
            if ((error = clWaitForEvents(1, e + j)))
            {
                vlog_error("Error: clWaitForEvents failed! err: %d\n", error);
                return error;
            }
            if ((error = clReleaseEvent(e[j])))
            {
                vlog_error("Error: clReleaseEvent failed! err: %d\n", error);
                return error;
            }
        }

        // Fill the result buffer with garbage, so that old results don't carry
        // over
        uint32_t pattern = 0xacdcacdc;
        if (gHostFill)
        {
            memset_pattern4(out[j], &pattern, buffer_size);
            error = clEnqueueUnmapMemObject(tinfo->tQueue, tinfo->outBuf[j],
                                            out[j], 0, NULL, NULL);
            test_error(error, "clEnqueueUnmapMemObject failed!\n");
        }
        else
        {
            error = clEnqueueFillBuffer(tinfo->tQueue, tinfo->outBuf[j],
                                        &pattern, sizeof(pattern), 0,
                                        buffer_size, 0, NULL, NULL);
            test_error(error, "clEnqueueFillBuffer failed!\n");
        }

        // run the kernel
        size_t vectorCount =
            (buffer_elements + sizeValues[j] - 1) / sizeValues[j];
        cl_kernel kernel = job->k[j][thread_id]; // each worker thread has its
                                                 // own copy of the cl_kernel
        cl_program program = job->programs[j];

        if ((error = clSetKernelArg(kernel, 0, sizeof(tinfo->outBuf[j]),
                                    &tinfo->outBuf[j])))
        {
            LogBuildError(program);
            return error;
        }
        if ((error = clSetKernelArg(kernel, 1, sizeof(tinfo->inBuf),
                                    &tinfo->inBuf)))
        {
            LogBuildError(program);
            return error;
        }
        if ((error = clSetKernelArg(kernel, 2, sizeof(tinfo->inBuf2),
                                    &tinfo->inBuf2)))
        {
            LogBuildError(program);
            return error;
        }

        if ((error = clEnqueueNDRangeKernel(tinfo->tQueue, kernel, 1, NULL,
                                            &vectorCount, NULL, 0, NULL, NULL)))
        {
            vlog_error("FAILED -- could not execute kernel\n");
            return error;
        }
    }

    // Get that moving
    if ((error = clFlush(tinfo->tQueue))) vlog("clFlush 2 failed\n");

    if (gSkipCorrectnessTesting) return CL_SUCCESS;

    // Calculate the correctly rounded reference result
    r = (cl_short *)gOut_Ref + thread_id * buffer_elements;
    t = (cl_short *)r;
    s.resize(buffer_elements);
    s2.resize(buffer_elements);
    for (j = 0; j < buffer_elements; j++)
    {
        s[j] = cl_half_to_float(p[j]);
        s2[j] = cl_half_to_float(p2[j]);
        r[j] = (short)func.i_ff(s[j], s2[j]);
    }

    // Read the data back -- no need to wait for the first N-1 buffers. This is
    // an in order queue.
    for (j = gMinVectorSizeIndex; j + 1 < gMaxVectorSizeIndex; j++)
    {
        out[j] = (cl_short *)clEnqueueMapBuffer(
            tinfo->tQueue, tinfo->outBuf[j], CL_FALSE, CL_MAP_READ, 0,
            buffer_size, 0, NULL, NULL, &error);
        if (error || NULL == out[j])
        {
            vlog_error("Error: clEnqueueMapBuffer %d failed! err: %d\n", j,
                       error);
            return error;
        }
    }

    // Wait for the last buffer
    out[j] = (cl_short *)clEnqueueMapBuffer(tinfo->tQueue, tinfo->outBuf[j],
                                            CL_TRUE, CL_MAP_READ, 0,
                                            buffer_size, 0, NULL, NULL, &error);
    if (error || NULL == out[j])
    {
        vlog_error("Error: clEnqueueMapBuffer %d failed! err: %d\n", j, error);
        return error;
    }

    // Verify data
    for (j = 0; j < buffer_elements; j++)
    {
        cl_short *q = (cl_short *)out[0];

        // If we aren't getting the correctly rounded result
        if (gMinVectorSizeIndex == 0 && t[j] != q[j])
        {
            if (ftz)
            {
                if (IsHalfSubnormal(p[j]))
                {
                    if (IsHalfSubnormal(p2[j]))
                    {
                        short correct = (short)func.i_ff(0.0f, 0.0f);
                        short correct2 = (short)func.i_ff(0.0f, -0.0f);
                        short correct3 = (short)func.i_ff(-0.0f, 0.0f);
                        short correct4 = (short)func.i_ff(-0.0f, -0.0f);

                        if (correct == q[j] || correct2 == q[j]
                            || correct3 == q[j] || correct4 == q[j])
                            continue;
                    }
                    else
                    {
                        short correct = (short)func.i_ff(0.0f, s2[j]);
                        short correct2 = (short)func.i_ff(-0.0f, s2[j]);
                        if (correct == q[j] || correct2 == q[j]) continue;
                    }
                }
                else if (IsHalfSubnormal(p2[j]))
                {
                    short correct = (short)func.i_ff(s[j], 0.0f);
                    short correct2 = (short)func.i_ff(s[j], -0.0f);
                    if (correct == q[j] || correct2 == q[j]) continue;
                }
            }

            short err = t[j] - q[j];
            if (q[j] > t[j]) err = q[j] - t[j];
            vlog_error(
                "\nERROR: %s: %d ulp error at {%a (0x%04x), %a "
                "(0x%04x)}\nExpected: 0x%04x \nActual: 0x%04x (index: %d)\n",
                name, err, s[j], p[j], s2[j], p2[j], t[j], q[j], j);
            error = -1;
            return error;
        }


        for (k = std::max(1U, gMinVectorSizeIndex); k < gMaxVectorSizeIndex;
             k++)
        {
            q = out[k];
            // If we aren't getting the correctly rounded result
            if (-t[j] != q[j])
            {
                if (ftz)
                {
                    if (IsHalfSubnormal(p[j]))
                    {
                        if (IsHalfSubnormal(p2[j]))
                        {
                            short correct = (short)-func.i_ff(0.0f, 0.0f);
                            short correct2 = (short)-func.i_ff(0.0f, -0.0f);
                            short correct3 = (short)-func.i_ff(-0.0f, 0.0f);
                            short correct4 = (short)-func.i_ff(-0.0f, -0.0f);

                            if (correct == q[j] || correct2 == q[j]
                                || correct3 == q[j] || correct4 == q[j])
                                continue;
                        }
                        else
                        {
                            short correct = (short)-func.i_ff(0.0f, s2[j]);
                            short correct2 = (short)-func.i_ff(-0.0f, s2[j]);
                            if (correct == q[j] || correct2 == q[j]) continue;
                        }
                    }
                    else if (IsHalfSubnormal(p2[j]))
                    {
                        short correct = (short)-func.i_ff(s[j], 0.0f);
                        short correct2 = (short)-func.i_ff(s[j], -0.0f);
                        if (correct == q[j] || correct2 == q[j]) continue;
                    }
                }

                cl_ushort err = -t[j] - q[j];
                if (q[j] > -t[j]) err = q[j] + t[j];
                vlog_error("\nERROR: %s: %d ulp error at {%a (0x%04x), %a "
                           "(0x%04x)}\nExpected: 0x%04x \nActual: 0x%04x "
                           "(index: %d)\n",
                           name, err, s[j], p[j], s2[j], p2[j], -t[j], q[j], j);
                error = -1;
                return error;
            }
        }
    }

    for (j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++)
    {
        if ((error = clEnqueueUnmapMemObject(tinfo->tQueue, tinfo->outBuf[j],
                                             out[j], 0, NULL, NULL)))
        {
            vlog_error("Error: clEnqueueUnmapMemObject %d failed 2! err: %d\n",
                       j, error);
            return error;
        }
    }

    if ((error = clFlush(tinfo->tQueue))) vlog("clFlush 3 failed\n");


    if (0 == (base & 0x0fffffff))
    {
        if (gVerboseBruteForce)
        {
            vlog("base:%14u step:%10u scale:%10u buf_elements:%10zd "
                 "ThreadCount:%2u\n",
                 base, job->step, job->scale, buffer_elements,
                 job->threadCount);
        }
        else
        {
            vlog(".");
        }
        fflush(stdout);
    }

    return error;
}

} // anonymous namespace

int TestMacro_Int_Half_Half(const Func *f, MTdata d, bool relaxedMode)
{
    TestInfoBase test_info_base;
    cl_int error;
    size_t i, j;

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

    // Init test_info
    memset(&test_info_base, 0, sizeof(test_info_base));
    TestInfo test_info(test_info_base);

    test_info.threadCount = GetThreadCount();
    test_info.subBufferSize = BUFFER_SIZE
        / (sizeof(cl_half) * RoundUpToNextPowerOfTwo(test_info.threadCount));
    test_info.scale = getTestScale(sizeof(cl_half));

    test_info.step = (cl_uint)test_info.subBufferSize * test_info.scale;
    if (test_info.step / test_info.subBufferSize != test_info.scale)
    {
        // there was overflow
        test_info.jobCount = 1;
    }
    else
    {
        test_info.jobCount = (cl_uint)((1ULL << 32) / test_info.step);
    }

    test_info.f = f;
    test_info.ftz =
        f->ftz || gForceFTZ || 0 == (CL_FP_DENORM & gHalfCapabilities);

    test_info.tinfo.resize(test_info.threadCount);

    for (i = 0; i < test_info.threadCount; i++)
    {
        cl_buffer_region region = { i * test_info.subBufferSize
                                        * sizeof(cl_half),
                                    test_info.subBufferSize * sizeof(cl_half) };
        test_info.tinfo[i].inBuf =
            clCreateSubBuffer(gInBuffer, CL_MEM_READ_ONLY,
                              CL_BUFFER_CREATE_TYPE_REGION, &region, &error);
        if (error || NULL == test_info.tinfo[i].inBuf)
        {
            vlog_error("Error: Unable to create sub-buffer of gInBuffer for "
                       "region {%zd, %zd}\n",
                       region.origin, region.size);
            return error;
        }
        test_info.tinfo[i].inBuf2 =
            clCreateSubBuffer(gInBuffer2, CL_MEM_READ_ONLY,
                              CL_BUFFER_CREATE_TYPE_REGION, &region, &error);
        if (error || NULL == test_info.tinfo[i].inBuf2)
        {
            vlog_error("Error: Unable to create sub-buffer of gInBuffer2 for "
                       "region {%zd, %zd}\n",
                       region.origin, region.size);
            return error;
        }

        for (j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++)
        {
            test_info.tinfo[i].outBuf[j] = clCreateSubBuffer(
                gOutBuffer[j], CL_MEM_WRITE_ONLY, CL_BUFFER_CREATE_TYPE_REGION,
                &region, &error);
            if (error || NULL == test_info.tinfo[i].outBuf[j])
            {
                vlog_error("Error: Unable to create sub-buffer of gOutBuffer "
                           "for region {%zd, %zd}\n",
                           region.origin, region.size);
                return error;
            }
        }
        test_info.tinfo[i].tQueue =
            clCreateCommandQueue(gContext, gDevice, 0, &error);
        if (NULL == test_info.tinfo[i].tQueue || error)
        {
            vlog_error("clCreateCommandQueue failed. (%d)\n", error);
            return error;
        }

        test_info.tinfo[i].d = MTdataHolder(genrand_int32(d));
    }

    // Init the kernels
    {
        BuildKernelInfo build_info = { test_info.threadCount, test_info.k,
                                       test_info.programs, f->nameInCode };
        error = ThreadPool_Do(BuildKernel_HalfFn,
                              gMaxVectorSizeIndex - gMinVectorSizeIndex,
                              &build_info);
        test_error(error, "ThreadPool_Do: BuildKernel_HalfFn failed\n");
    }

    if (!gSkipCorrectnessTesting)
    {
        error = ThreadPool_Do(TestHalf, test_info.jobCount, &test_info);

        test_error(error, "ThreadPool_Do: TestHalf failed\n");

        if (gWimpyMode)
            vlog("Wimp pass");
        else
            vlog("passed");
    }

    vlog("\n");

    return error;
}
