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#include <stdio.h>
#include <stdlib.h>
#include <string.h> // for memset, memcmp
#include "erasure_code.h"
#include "test.h"

// By default, test multibinary version
#ifndef FUNCTION_UNDER_TEST
#define FUNCTION_UNDER_TEST ec_encode_data_update
#define REF_FUNCTION        ec_encode_data
#endif

// By default, test EC(8+4)
#if (!defined(VECT))
#define VECT 4
#endif

#define str(s)  #s
#define xstr(s) str(s)

#ifndef GT_L3_CACHE
#define GT_L3_CACHE 32 * 1024 * 1024 /* some number > last level cache */
#endif

#if !defined(COLD_TEST) && !defined(TEST_CUSTOM)
// Cached test, loop many times over small dataset
#define TEST_SOURCES  32
#define TEST_LEN(m)   ((128 * 1024 / m) & ~(64 - 1))
#define TEST_TYPE_STR "_warm"
#elif defined(COLD_TEST)
// Uncached test.  Pull from large mem base.
#define TEST_SOURCES  32
#define TEST_LEN(m)   ((GT_L3_CACHE / m) & ~(64 - 1))
#define TEST_TYPE_STR "_cold"
#elif defined(TEST_CUSTOM)
#define TEST_TYPE_STR "_cus"
#endif
#ifndef TEST_SEED
#define TEST_SEED 0x1234
#endif

#define MMAX TEST_SOURCES
#define KMAX TEST_SOURCES

typedef unsigned char u8;

void
usage(const char *app_name)
{
        fprintf(stderr,
                "Usage: %s [options]\n"
                "  -h        Help\n"
                "  -k <val>  Number of source buffers\n"
                "  -p <val>  Number of parity buffers\n"
                "  -e <val>  Number of simulated buffers with errors (cannot be higher than p or "
                "k)\n",
                app_name);
}

void
dump(unsigned char *buf, int len)
{
        int i;
        for (i = 0; i < len;) {
                printf(" %2x", 0xff & buf[i++]);
                if (i % 32 == 0)
                        printf("\n");
        }
        printf("\n");
}

void
encode_update_test_ref(int m, int k, u8 *g_tbls, u8 **buffs, u8 *a)
{
        ec_init_tables(k, m - k, &a[k * k], g_tbls);
        REF_FUNCTION(TEST_LEN(m), k, m - k, g_tbls, buffs, &buffs[k]);
}

void
encode_update_test(int m, int k, u8 *g_tbls, u8 **perf_update_buffs, u8 *a)
{
        int i;

        // Make parity vects
        ec_init_tables(k, m - k, &a[k * k], g_tbls);
        for (i = 0; i < k; i++) {
                FUNCTION_UNDER_TEST(TEST_LEN(m), k, m - k, i, g_tbls, perf_update_buffs[i],
                                    &perf_update_buffs[k]);
        }
}

int
decode_test(int m, int k, u8 **update_buffs, u8 **recov, u8 *a, u8 *src_in_err, u8 *src_err_list,
            int nerrs, u8 *g_tbls, u8 **perf_update_buffs)
{
        int i, j, r;
        u8 b[MMAX * KMAX], c[MMAX * KMAX], d[MMAX * KMAX];
        // Construct b by removing error rows
        for (i = 0, r = 0; i < k; i++, r++) {
                while (src_in_err[r])
                        r++;
                recov[i] = update_buffs[r];
                for (j = 0; j < k; j++)
                        b[k * i + j] = a[k * r + j];
        }

        if (gf_invert_matrix(b, d, k) < 0) {
                printf("BAD MATRIX\n");
                return -1;
        }

        for (i = 0; i < nerrs; i++)
                for (j = 0; j < k; j++)
                        c[k * i + j] = d[k * src_err_list[i] + j];

        // Recover data
        ec_init_tables(k, nerrs, c, g_tbls);
        for (i = 0; i < k; i++) {
                FUNCTION_UNDER_TEST(TEST_LEN(m), k, nerrs, i, g_tbls, recov[i], perf_update_buffs);
        }
        return 0;
}

// Helper function for single source benchmark
void
encode_single_src_test(const int m, const int k, u8 *g_tbls, u8 **perf_update_buffs, u8 *a)
{
        // Make parity vects
        ec_init_tables(k, m - k, &a[k * k], g_tbls);
        FUNCTION_UNDER_TEST(TEST_LEN(m), k, m - k, 0, g_tbls, perf_update_buffs[0],
                            &perf_update_buffs[k]);
}

// Helper function for simple single source benchmark
void
encode_single_src_simple_test(const int m, const int k, u8 *g_tbls, u8 **perf_update_buffs, u8 *a)
{
        FUNCTION_UNDER_TEST(TEST_LEN(m), k, m - k, 0, g_tbls, perf_update_buffs[0],
                            &perf_update_buffs[k]);
}

int
main(int argc, char *argv[])
{
        int i, j, check, m, k, p, nerrs, ret = -1;
        void *buf;
        u8 *temp_buffs[TEST_SOURCES] = { NULL };
        u8 *buffs[TEST_SOURCES] = { NULL };
        u8 *update_buffs[TEST_SOURCES] = { NULL };
        u8 *perf_update_buffs[TEST_SOURCES] = { NULL };
        u8 a[MMAX * KMAX];
        u8 g_tbls[KMAX * TEST_SOURCES * 32], src_in_err[TEST_SOURCES];
        u8 src_err_list[TEST_SOURCES], *recov[TEST_SOURCES];
        struct perf start;

        /* Set default parameters */
        k = 10;
        p = VECT;
        nerrs = VECT;

        /* Parse arguments */
        for (i = 1; i < argc; i++) {
                if (strcmp(argv[i], "-k") == 0) {
                        k = atoi(argv[++i]);
                } else if (strcmp(argv[i], "-p") == 0) {
                        p = atoi(argv[++i]);
                } else if (strcmp(argv[i], "-e") == 0) {
                        nerrs = atoi(argv[++i]);
                } else if (strcmp(argv[i], "-h") == 0) {
                        usage(argv[0]);
                        return 0;
                } else {
                        usage(argv[0]);
                        return -1;
                }
        }

        if (nerrs > k) {
                printf("Number of errors (%d) cannot be higher than number of data buffers (%d)\n",
                       nerrs, k);
                return -1;
        }

        if (k <= 0) {
                printf("Number of source buffers (%d) must be > 0\n", k);
                return -1;
        }

        if (p <= 0) {
                printf("Number of parity buffers (%d) must be > 0\n", p);
                return -1;
        }

        if (nerrs > p) {
                printf("Number of errors (%d) cannot be higher than number of parity buffers "
                       "(%d)\n",
                       nerrs, p);
                return -1;
        }

        if (nerrs <= 0) {
                printf("Number of errors (%d) must be > 0\n", nerrs);
                return -1;
        }

        m = k + p;

        if (m > MMAX) {
                printf("Number of total buffers (data and parity) cannot be higher than %d\n",
                       MMAX);
                return -1;
        }

        u8 *err_list = malloc((size_t) nerrs);
        if (err_list == NULL) {
                printf("Error allocating list of array of error indices\n");
                return -1;
        }

        srand(TEST_SEED);

        for (i = 0; i < nerrs;) {
                u8 next_err = rand() % k;
                for (j = 0; j < i; j++)
                        if (next_err == err_list[j])
                                break;
                if (j != i)
                        continue;
                err_list[i++] = next_err;
        }

        printf("Testing with %u data buffers and %u parity buffers (num errors = %u, in [ ", k, p,
               nerrs);
        for (i = 0; i < nerrs; i++)
                printf("%d ", err_list[i]);

        printf("])\n");

        printf(xstr(FUNCTION_UNDER_TEST) "_perf: %dx%d %d\n", m, TEST_LEN(m), nerrs);

        memcpy(src_err_list, err_list, nerrs);
        memset(src_in_err, 0, TEST_SOURCES);
        for (i = 0; i < nerrs; i++)
                src_in_err[src_err_list[i]] = 1;

        // Allocate the arrays
        for (i = 0; i < m; i++) {
                if (posix_memalign(&buf, 64, TEST_LEN(m))) {
                        printf("Error allocating buffers\n");
                        goto exit;
                }
                buffs[i] = buf;
        }

        for (i = 0; i < (m - k); i++) {
                if (posix_memalign(&buf, 64, TEST_LEN(m))) {
                        printf("Error allocating buffers\n");
                        goto exit;
                }
                temp_buffs[i] = buf;
                memset(temp_buffs[i], 0, TEST_LEN(m)); // initialize the destination buffer to be
                                                       // zero for update function
        }

        for (i = 0; i < TEST_SOURCES; i++) {
                if (posix_memalign(&buf, 64, TEST_LEN(m))) {
                        printf("Error allocating buffers\n");
                        goto exit;
                }
                update_buffs[i] = buf;
                memset(update_buffs[i], 0, TEST_LEN(m)); // initialize the destination buffer to be
                                                         // zero for update function
        }
        for (i = 0; i < TEST_SOURCES; i++) {
                if (posix_memalign(&buf, 64, TEST_LEN(m))) {
                        printf("Error allocating buffers\n");
                        goto exit;
                }
                perf_update_buffs[i] = buf;
                memset(perf_update_buffs[i], 0, TEST_LEN(m)); // initialize the destination buffer
                                                              // to be zero for update function
        }

        // Make random data
        for (i = 0; i < k; i++)
                for (j = 0; j < TEST_LEN(m); j++) {
                        buffs[i][j] = rand();
                        update_buffs[i][j] = buffs[i][j];
                }

        gf_gen_rs_matrix(a, m, k);

        encode_update_test_ref(m, k, g_tbls, buffs, a);
        encode_update_test(m, k, g_tbls, update_buffs, a);
        for (i = 0; i < m - k; i++) {
                if (0 != memcmp(update_buffs[k + i], buffs[k + i], TEST_LEN(m))) {
                        printf("\nupdate_buffs%d  :", i);
                        dump(update_buffs[k + i], 25);
                        printf("buffs%d         :", i);
                        dump(buffs[k + i], 25);
                        goto exit;
                }
        }

#ifdef DO_REF_PERF
        // Start encode test
        BENCHMARK(&start, BENCHMARK_TIME, encode_update_test_ref(m, k, g_tbls, buffs, a));
        printf(xstr(REF_FUNCTION) TEST_TYPE_STR ": ");
        perf_print(start, (long long) (TEST_LEN(m)) * (m));
#endif

        // Start encode test
        BENCHMARK(&start, BENCHMARK_TIME, encode_update_test(m, k, g_tbls, perf_update_buffs, a));
        printf(xstr(FUNCTION_UNDER_TEST) TEST_TYPE_STR ": ");
        perf_print(start, (long long) (TEST_LEN(m)) * (m));

        // Start encode test
        BENCHMARK(&start, BENCHMARK_TIME,
                  encode_single_src_test(m, k, g_tbls, perf_update_buffs, a));
        printf(xstr(FUNCTION_UNDER_TEST) "_single_src" TEST_TYPE_STR ": ");
        perf_print(start, (long long) (TEST_LEN(m)) * (m - k + 1));

        // Start encode test
        BENCHMARK(&start, BENCHMARK_TIME,
                  encode_single_src_simple_test(m, k, g_tbls, perf_update_buffs, a));
        printf(xstr(FUNCTION_UNDER_TEST) "_single_src_simple" TEST_TYPE_STR ": ");
        perf_print(start, (long long) (TEST_LEN(m)) * (m - k + 1));

        for (i = k; i < m; i++) {
                memset(update_buffs[i], 0, TEST_LEN(m)); // initialize the destination buffer to be
                                                         // zero for update function
        }
        for (i = 0; i < k; i++) {
                FUNCTION_UNDER_TEST(TEST_LEN(m), k, m - k, i, g_tbls, update_buffs[i],
                                    &update_buffs[k]);
        }

        decode_test(m, k, update_buffs, recov, a, src_in_err, src_err_list, nerrs, g_tbls,
                    temp_buffs);
        BENCHMARK(&start, BENCHMARK_TIME,
                  check = decode_test(m, k, update_buffs, recov, a, src_in_err, src_err_list, nerrs,
                                      g_tbls, perf_update_buffs));
        if (check) {
                printf("BAD_MATRIX\n");
                ret = check;
                goto exit;
        }

        for (i = 0; i < nerrs; i++) {
                if (0 != memcmp(temp_buffs[i], update_buffs[src_err_list[i]], TEST_LEN(m))) {
                        printf("Fail error recovery (%d, %d, %d) - \n", m, k, nerrs);
                        goto exit;
                }
        }

        printf(xstr(FUNCTION_UNDER_TEST) "_decode" TEST_TYPE_STR ": ");
        perf_print(start, (long long) (TEST_LEN(m)) * (k + nerrs));

        printf("done all: Pass\n");

        ret = 0;

exit:
        free(err_list);
        for (i = 0; i < TEST_SOURCES; i++) {
                aligned_free(buffs[i]);
                aligned_free(temp_buffs[i]);
                aligned_free(update_buffs[i]);
                aligned_free(perf_update_buffs[i]);
        }
        return ret;
}
