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//
// 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 "testBase.h"
#include "harness/conversions.h"

const char * atomic_index_source =
"#pragma OPENCL EXTENSION cl_khr_global_int32_base_atomics : enable\n"
"// Counter keeps track of which index in counts we are using.\n"
"// We get that value, increment it, and then set that index in counts to our thread ID.\n"
"// At the end of this we should have all thread IDs in some random location in counts\n"
"// exactly once. If atom_add failed then we will write over various thread IDs and we\n"
"// will be missing some.\n"
"\n"
"__kernel void add_index_test(__global int *counter, __global int *counts) {\n"
"    int tid = get_global_id(0);\n"
"    \n"
"    int counter_to_use = atom_add(counter, 1);\n"
"    counts[counter_to_use] = tid;\n"
"}";

int test_atomic_add_index(cl_device_id deviceID, cl_context context, cl_command_queue queue, int num_elements)
{
    clProgramWrapper program;
    clKernelWrapper kernel;
    clMemWrapper counter, counters;
    size_t numGlobalThreads, numLocalThreads;
    int fail = 0, succeed = 0, err;

  /* Check if atomics are supported. */
  if (!is_extension_available(deviceID, "cl_khr_global_int32_base_atomics")) {
    log_info("Base atomics not supported (cl_khr_global_int32_base_atomics). Skipping test.\n");
    return 0;
  }

    //===== add_index test
    // The index test replicates what particles does.
    // It uses one memory location to keep track of the current index and then each thread
    // does an atomic add to it to get its new location. The threads then write to their
    // assigned location. At the end we check to make sure that each thread's ID shows up
    // exactly once in the output.

    numGlobalThreads = 2048;

    if( create_single_kernel_helper( context, &program, &kernel, 1, &atomic_index_source, "add_index_test" ) )
        return -1;

    if( get_max_common_work_group_size( context, kernel, numGlobalThreads, &numLocalThreads ) )
        return -1;

    log_info("Execute global_threads:%d local_threads:%d\n",
             (int)numGlobalThreads, (int)numLocalThreads);

    // Create the counter that will keep track of where each thread writes.
    counter = clCreateBuffer(context, CL_MEM_READ_WRITE, sizeof(cl_int) * 1,
                             NULL, NULL);
    // Create the counters that will hold the results of each thread writing
    // its ID into a (hopefully) unique location.
    counters = clCreateBuffer(context, CL_MEM_READ_WRITE,
                              sizeof(cl_int) * numGlobalThreads, NULL, NULL);

    // Reset all those locations to -1 to indciate they have not been used.
    cl_int *values = (cl_int*) malloc(sizeof(cl_int)*numGlobalThreads);
    if (values == NULL) {
        log_error("add_index_test FAILED to allocate memory for initial values.\n");
        fail = 1; succeed = -1;
    } else {
        memset(values, -1, numLocalThreads);
        unsigned int i=0;
        for (i=0; i<numGlobalThreads; i++)
            values[i] = -1;
        int init=0;
        err = clEnqueueWriteBuffer(queue, counters, true, 0, numGlobalThreads*sizeof(cl_int), values, 0, NULL, NULL);
        err |= clEnqueueWriteBuffer(queue, counter, true, 0,1*sizeof(cl_int), &init, 0, NULL, NULL);
        if (err) {
            log_error("add_index_test FAILED to write initial values to arrays: %d\n", err);
            fail=1; succeed=-1;
        } else {
            err = clSetKernelArg(kernel, 0, sizeof(counter), &counter);
            err |= clSetKernelArg(kernel, 1, sizeof(counters), &counters);
            if (err) {
                log_error("add_index_test FAILED to set kernel arguments: %d\n", err);
                fail=1; succeed=-1;
            } else {
                err = clEnqueueNDRangeKernel( queue, kernel, 1, NULL, &numGlobalThreads, &numLocalThreads, 0, NULL, NULL );
                if (err) {
                    log_error("add_index_test FAILED to execute kernel: %d\n", err);
                    fail=1; succeed=-1;
                } else {
                    err = clEnqueueReadBuffer( queue, counters, true, 0, sizeof(cl_int)*numGlobalThreads, values, 0, NULL, NULL );
                    if (err) {
                        log_error("add_index_test FAILED to read back results: %d\n", err);
                        fail = 1; succeed=-1;
                    } else {
                        unsigned int looking_for, index;
                        for (looking_for=0; looking_for<numGlobalThreads; looking_for++) {
                            int instances_found=0;
                            for (index=0; index<numGlobalThreads; index++) {
                                if (values[index]==(int)looking_for)
                                    instances_found++;
                            }
                            if (instances_found != 1) {
                                log_error("add_index_test FAILED: wrong number of instances (%d!=1) for counter %d.\n", instances_found, looking_for);
                                fail = 1; succeed=-1;
                            }
                        }
                    }
                }
            }
        }
        if (!fail) {
            log_info("add_index_test passed. Each thread used exactly one index.\n");
        }
        free(values);
    }
    return fail;
}

const char *add_index_bin_kernel[] = {
"#pragma OPENCL EXTENSION cl_khr_global_int32_base_atomics : enable\n"
"// This test assigns a bunch of values to bins and then tries to put them in the bins in parallel\n"
"// using an atomic add to keep track of the current location to write into in each bin.\n"
"// This is the same as the memory update for the particles demo.\n"
"\n"
"__kernel void add_index_bin_test(__global int *bin_counters, __global int *bins, __global int *bin_assignments, int max_counts_per_bin) {\n"
"    int tid = get_global_id(0);\n"
"\n"
"    int location = bin_assignments[tid];\n"
"    int counter = atom_add(&bin_counters[location], 1);\n"
"    bins[location*max_counts_per_bin + counter] = tid;\n"
"}" };

// This test assigns a bunch of values to bins and then tries to put them in the bins in parallel
// using an atomic add to keep track of the current location to write into in each bin.
// This is the same as the memory update for the particles demo.
int add_index_bin_test(size_t *global_threads, cl_command_queue queue, cl_context context, MTdata d)
{
    int number_of_items = (int)global_threads[0];
    size_t local_threads[1];
    int divisor = 12;
    int number_of_bins = number_of_items/divisor;
    int max_counts_per_bin = divisor*2;

    int fail = 0;
    int succeed = 0;
    int err;

    clProgramWrapper program;
    clKernelWrapper kernel;

    //  log_info("add_index_bin_test: %d items, into %d bins, with a max of %d items per bin (bins is %d long).\n",
    //           number_of_items, number_of_bins, max_counts_per_bin, number_of_bins*max_counts_per_bin);

    //===== add_index_bin test
    // The index test replicates what particles does.
    err = create_single_kernel_helper(context, &program, &kernel, 1, add_index_bin_kernel, "add_index_bin_test" );
    test_error( err, "Unable to create testing kernel" );

    if( get_max_common_work_group_size( context, kernel, global_threads[0], &local_threads[0] ) )
        return -1;

    log_info("Execute global_threads:%d local_threads:%d\n",
             (int)global_threads[0], (int)local_threads[0]);

    // Allocate our storage
    cl_mem bin_counters =
        clCreateBuffer(context, CL_MEM_READ_WRITE,
                       sizeof(cl_int) * number_of_bins, NULL, NULL);
    cl_mem bins = clCreateBuffer(
        context, CL_MEM_READ_WRITE,
        sizeof(cl_int) * number_of_bins * max_counts_per_bin, NULL, NULL);
    cl_mem bin_assignments =
        clCreateBuffer(context, CL_MEM_READ_ONLY,
                       sizeof(cl_int) * number_of_items, NULL, NULL);

    if (bin_counters == NULL) {
        log_error("add_index_bin_test FAILED to allocate bin_counters.\n");
        return -1;
    }
    if (bins == NULL) {
        log_error("add_index_bin_test FAILED to allocate bins.\n");
        return -1;
    }
    if (bin_assignments == NULL) {
        log_error("add_index_bin_test FAILED to allocate bin_assignments.\n");
        return -1;
    }

    // Initialize our storage
    cl_int *l_bin_counts = (cl_int*)malloc(sizeof(cl_int)*number_of_bins);
    if (!l_bin_counts) {
        log_error("add_index_bin_test FAILED to allocate initial values for bin_counters.\n");
        return -1;
    }
    int i;
    for (i=0; i<number_of_bins; i++)
        l_bin_counts[i] = 0;
    err = clEnqueueWriteBuffer(queue, bin_counters, true, 0, sizeof(cl_int)*number_of_bins, l_bin_counts, 0, NULL, NULL);
    if (err) {
        log_error("add_index_bin_test FAILED to set initial values for bin_counters: %d\n", err);
        return -1;
    }

    cl_int *values = (cl_int*)malloc(sizeof(cl_int)*number_of_bins*max_counts_per_bin);
    if (!values) {
        log_error("add_index_bin_test FAILED to allocate initial values for bins.\n");
        return -1;
    }
    for (i=0; i<number_of_bins*max_counts_per_bin; i++)
        values[i] = -1;
    err = clEnqueueWriteBuffer(queue, bins, true, 0, sizeof(cl_int)*number_of_bins*max_counts_per_bin, values, 0, NULL, NULL);
    if (err) {
        log_error("add_index_bin_test FAILED to set initial values for bins: %d\n", err);
        return -1;
    }
    free(values);

    cl_int *l_bin_assignments = (cl_int*)malloc(sizeof(cl_int)*number_of_items);
    if (!l_bin_assignments) {
        log_error("add_index_bin_test FAILED to allocate initial values for l_bin_assignments.\n");
        return -1;
    }
    for (i=0; i<number_of_items; i++) {
        int bin = random_in_range(0, number_of_bins-1, d);
        while (l_bin_counts[bin] >= max_counts_per_bin) {
            bin = random_in_range(0, number_of_bins-1, d);
        }
        if (bin >= number_of_bins)
            log_error("add_index_bin_test internal error generating bin assignments: bin %d >= number_of_bins %d.\n", bin, number_of_bins);
        if (l_bin_counts[bin]+1 > max_counts_per_bin)
            log_error("add_index_bin_test internal error generating bin assignments: bin %d has more entries (%d) than max_counts_per_bin (%d).\n", bin, l_bin_counts[bin], max_counts_per_bin);
        l_bin_counts[bin]++;
        l_bin_assignments[i] = bin;
        //     log_info("item %d assigned to bin %d (%d items)\n", i, bin, l_bin_counts[bin]);
    }
    err = clEnqueueWriteBuffer(queue, bin_assignments, true, 0, sizeof(cl_int)*number_of_items, l_bin_assignments, 0, NULL, NULL);
    if (err) {
        log_error("add_index_bin_test FAILED to set initial values for bin_assignments: %d\n", err);
        return -1;
    }
    // Setup the kernel
    err = clSetKernelArg(kernel, 0, sizeof(bin_counters), &bin_counters);
    err |= clSetKernelArg(kernel, 1, sizeof(bins), &bins);
    err |= clSetKernelArg(kernel, 2, sizeof(bin_assignments), &bin_assignments);
    err |= clSetKernelArg(kernel, 3, sizeof(max_counts_per_bin), &max_counts_per_bin);
    if (err) {
        log_error("add_index_bin_test FAILED to set kernel arguments: %d\n", err);
        fail=1; succeed=-1;
        return -1;
    }

    err = clEnqueueNDRangeKernel( queue, kernel, 1, NULL, global_threads, local_threads, 0, NULL, NULL );
    if (err) {
        log_error("add_index_bin_test FAILED to execute kernel: %d\n", err);
        fail=1; succeed=-1;
    }

    cl_int *final_bin_assignments = (cl_int*)malloc(sizeof(cl_int)*number_of_bins*max_counts_per_bin);
    if (!final_bin_assignments) {
        log_error("add_index_bin_test FAILED to allocate initial values for final_bin_assignments.\n");
        return -1;
    }
    err = clEnqueueReadBuffer( queue, bins, true, 0, sizeof(cl_int)*number_of_bins*max_counts_per_bin, final_bin_assignments, 0, NULL, NULL );
    if (err) {
        log_error("add_index_bin_test FAILED to read back bins: %d\n", err);
        fail = 1; succeed=-1;
    }

    cl_int *final_bin_counts = (cl_int*)malloc(sizeof(cl_int)*number_of_bins);
    if (!final_bin_counts) {
        log_error("add_index_bin_test FAILED to allocate initial values for final_bin_counts.\n");
        return -1;
    }
    err = clEnqueueReadBuffer( queue, bin_counters, true, 0, sizeof(cl_int)*number_of_bins, final_bin_counts, 0, NULL, NULL );
    if (err) {
        log_error("add_index_bin_test FAILED to read back bin_counters: %d\n", err);
        fail = 1; succeed=-1;
    }

    // Verification.
    int errors=0;
    int current_bin;
    int search;
    //  Print out all the contents of the bins.
    //  for (current_bin=0; current_bin<number_of_bins; current_bin++)
    //        for (search=0; search<max_counts_per_bin; search++)
    //      log_info("[bin %d, entry %d] = %d\n", current_bin, search, final_bin_assignments[current_bin*max_counts_per_bin+search]);

    // First verify that there are the correct number in each bin.
    for (current_bin=0; current_bin<number_of_bins; current_bin++) {
        int expected_number = l_bin_counts[current_bin];
        int actual_number = final_bin_counts[current_bin];
        if (expected_number != actual_number) {
            log_error("add_index_bin_test FAILED: bin %d reported %d entries when %d were expected.\n", current_bin, actual_number, expected_number);
            errors++;
        }
        for (search=0; search<expected_number; search++) {
            if (final_bin_assignments[current_bin*max_counts_per_bin+search] == -1) {
                log_error("add_index_bin_test FAILED: bin %d had no entry at position %d when it should have had %d entries.\n", current_bin, search, expected_number);
                errors++;
            }
        }
        for (search=expected_number; search<max_counts_per_bin; search++) {
            if (final_bin_assignments[current_bin*max_counts_per_bin+search] != -1) {
                log_error("add_index_bin_test FAILED: bin %d had an extra entry at position %d when it should have had only %d entries.\n", current_bin, search, expected_number);
                errors++;
            }
        }
    }
    // Now verify that the correct ones are in each bin
    int index;
    for (index=0; index<number_of_items; index++) {
        int expected_bin = l_bin_assignments[index];
        int found_it = 0;
        for (search=0; search<l_bin_counts[expected_bin]; search++) {
            if (final_bin_assignments[expected_bin*max_counts_per_bin+search] == index) {
                found_it = 1;
            }
        }
        if (found_it == 0) {
            log_error("add_index_bin_test FAILED: did not find item %d in bin %d.\n", index, expected_bin);
            errors++;
        }
    }
    free(l_bin_counts);
    free(l_bin_assignments);
    free(final_bin_assignments);
    free(final_bin_counts);
    clReleaseMemObject(bin_counters);
    clReleaseMemObject(bins);
    clReleaseMemObject(bin_assignments);
    if (errors == 0) {
        log_info("add_index_bin_test passed. Each item was put in the correct bin in parallel.\n");
        return 0;
    } else {
        log_error("add_index_bin_test FAILED: %d errors.\n", errors);
        return -1;
    }
}

int test_atomic_add_index_bin(cl_device_id deviceID, cl_context context, cl_command_queue queue, int num_elements)
{
    //===== add_index_bin test
    size_t numGlobalThreads = 2048;
    int iteration=0;
    int err, failed = 0;
    MTdata d = init_genrand( gRandomSeed );

  /* Check if atomics are supported. */
  if (!is_extension_available(deviceID, "cl_khr_global_int32_base_atomics")) {
    log_info("Base atomics not supported (cl_khr_global_int32_base_atomics). Skipping test.\n");
    free_mtdata( d );
    return 0;
  }

    for(iteration=0; iteration<10; iteration++) {
        log_info("add_index_bin_test with %d elements:\n", (int)numGlobalThreads);
        err = add_index_bin_test(&numGlobalThreads,  queue,  context, d);
        if (err) {
            failed++;
            break;
        }
        numGlobalThreads*=2;
    }
    free_mtdata( d );
    return failed;
}