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#include <stdio.h>
#include <stdlib.h>
#include <string.h>		// for memset, memcmp
#include <assert.h>
#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

#define MMAX TEST_SOURCES
#define KMAX TEST_SOURCES

#define BAD_MATRIX -1

typedef unsigned char u8;

void ec_encode_perf(int m, int k, u8 * a, u8 * g_tbls, u8 ** buffs)
{
	ec_init_tables_base(k, m - k, &a[k * k], g_tbls);
	ec_encode_data_base(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)
{
	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_base(k, nerrs, c, g_tbls);
	ec_encode_data_base(TEST_LEN(m), k, nerrs, g_tbls, recov, temp_buffs);

	return 0;
}

int main(int argc, char *argv[])
{
	int i, j, m, k, nerrs, check;
	void *buf;
	u8 *temp_buffs[TEST_SOURCES], *buffs[TEST_SOURCES];
	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;

	// Pick test parameters
	m = 14;
	k = 10;
	nerrs = 4;
	const u8 err_list[] = { 2, 4, 5, 7 };

	printf("erasure_code_base_perf: %dx%d %d\n", m, TEST_LEN(m), nerrs);

	// check input parameters
	assert(!(m > MMAX || k > KMAX || nerrs > (m - k)));

	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("alloc error: Fail\n");
			return -1;
		}
		buffs[i] = buf;
	}

	for (i = 0; i < (m - k); i++) {
		if (posix_memalign(&buf, 64, TEST_LEN(m))) {
			printf("alloc error: Fail\n");
			return -1;
		}
		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
	BENCHMARK(&start, BENCHMARK_TIME, ec_encode_perf(m, k, a, g_tbls, buffs));
	printf("erasure_code_base_encode" TEST_TYPE_STR ": ");
	perf_print(start, (long long)(TEST_LEN(m)) * (m));

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

	if (check == BAD_MATRIX) {
		printf("BAD MATRIX\n");
		return check;
	}

	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);
			return -1;
		}
	}

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

	printf("done all: Pass\n");
	return 0;
}