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

#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

#define BAD_MATRIX -1

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 ec_encode_perf(int m, int k, u8 * a, u8 * g_tbls, u8 ** buffs, struct perf *start)
{
	ec_init_tables(k, m - k, &a[k * k], g_tbls);
	BENCHMARK(start, BENCHMARK_TIME,
		  ec_encode_data(TEST_LEN(m), k, m - k, g_tbls, buffs, &buffs[k]));
}

int ec_decode_perf(int m, int k, u8 * a, u8 * g_tbls, u8 ** buffs, u8 * src_in_err,
		   u8 * src_err_list, int nerrs, u8 ** temp_buffs, struct perf *start)
{
	int i, j, r;
	u8 b[MMAX * KMAX], c[MMAX * KMAX], d[MMAX * KMAX];
	u8 *recov[TEST_SOURCES];

	// Construct b by removing error rows
	for (i = 0, r = 0; i < k; i++, r++) {
		while (src_in_err[r])
			r++;
		recov[i] = buffs[r];
		for (j = 0; j < k; j++)
			b[k * i + j] = a[k * r + j];
	}

	if (gf_invert_matrix(b, d, k) < 0)
		return BAD_MATRIX;

	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);
	BENCHMARK(start, BENCHMARK_TIME,
		  ec_encode_data(TEST_LEN(m), k, nerrs, g_tbls, recov, temp_buffs));

	return 0;
}

int main(int argc, char *argv[])
{
	int i, j, m, k, p, nerrs, check, ret = -1;
	void *buf;
	u8 *temp_buffs[TEST_SOURCES] = { NULL };
	u8 *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];
	struct perf start;

	/* Set default parameters */
	k = 8;
	p = 6;
	nerrs = 4;

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

	if (nerrs > p) {
		printf
		    ("Number of errors (%d) cannot be higher than number of parity buffers (%d)\n",
		     nerrs, p);
		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 ", (int)err_list[i]);

	printf("])\n");

	printf("erasure_code_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 < p; i++) {
		if (posix_memalign(&buf, 64, TEST_LEN(m))) {
			printf("Error allocating buffers\n");
			goto exit;
		}
		temp_buffs[i] = buf;
	}

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

	gf_gen_rs_matrix(a, m, k);

	// Start encode test
	ec_encode_perf(m, k, a, g_tbls, buffs, &start);
	printf("erasure_code_encode" TEST_TYPE_STR ": ");
	perf_print(start, (long long)(TEST_LEN(m)) * (m));

	// Start decode test
	check = ec_decode_perf(m, k, a, g_tbls, buffs, src_in_err, src_err_list, nerrs,
			       temp_buffs, &start);

	if (check == BAD_MATRIX) {
		printf("BAD MATRIX\n");
		ret = check;
		goto exit;
	}

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

	printf("erasure_code_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++) {
		free(buffs[i]);
		free(temp_buffs[i]);
	}
	return ret;
}