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

#define TEST_LEN 8192
#define TEST_SIZE (TEST_LEN/2)

#ifndef TEST_SOURCES
# define TEST_SOURCES  250
#endif
#ifndef RANDOMS
# define RANDOMS 20
#endif

#define MMAX TEST_SOURCES
#define KMAX TEST_SOURCES

typedef unsigned char u8;

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 dump_matrix(unsigned char **s, int k, int m)
{
	int i, j;
	for (i = 0; i < k; i++) {
		for (j = 0; j < m; j++) {
			printf(" %2x", s[i][j]);
		}
		printf("\n");
	}
	printf("\n");
}

void dump_u8xu8(unsigned char *s, int k, int m)
{
	int i, j;
	for (i = 0; i < k; i++) {
		for (j = 0; j < m; j++) {
			printf(" %2x", 0xff & s[j + (i * m)]);
		}
		printf("\n");
	}
	printf("\n");
}

int main(int argc, char *argv[])
{
	int i, j, rtest, m, k, nerrs, r, err;
	void *buf;
	u8 g[TEST_SOURCES], g_tbls[TEST_SOURCES * 32], src_in_err[TEST_SOURCES];
	u8 *dest, *dest_ref, *temp_buff, *buffs[TEST_SOURCES];
	u8 a[MMAX * KMAX], b[MMAX * KMAX], d[MMAX * KMAX];
	u8 src_err_list[TEST_SOURCES], *recov[TEST_SOURCES];

	printf("gf_vect_dot_prod_base: %dx%d ", TEST_SOURCES, TEST_LEN);

	// Allocate the arrays
	for (i = 0; i < TEST_SOURCES; i++) {
		if (posix_memalign(&buf, 64, TEST_LEN)) {
			printf("alloc error: Fail");
			return -1;
		}
		buffs[i] = buf;
	}

	if (posix_memalign(&buf, 64, TEST_LEN)) {
		printf("alloc error: Fail");
		return -1;
	}
	dest = buf;

	if (posix_memalign(&buf, 64, TEST_LEN)) {
		printf("alloc error: Fail");
		return -1;
	}
	dest_ref = buf;

	if (posix_memalign(&buf, 64, TEST_LEN)) {
		printf("alloc error: Fail");
		return -1;
	}
	temp_buff = buf;

	// Init
	for (i = 0; i < TEST_SOURCES; i++)
		memset(buffs[i], 0, TEST_LEN);

	memset(dest, 0, TEST_LEN);
	memset(temp_buff, 0, TEST_LEN);
	memset(dest_ref, 0, TEST_LEN);
	memset(g, 0, TEST_SOURCES);

	// Test erasure code using gf_vect_dot_prod
	// Pick a first test
	m = 9;
	k = 5;
	if (m > MMAX || k > KMAX)
		return -1;

	gf_gen_cauchy1_matrix(a, m, k);

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

	// Make parity vects
	for (i = k; i < m; i++) {
		for (j = 0; j < k; j++)
			gf_vect_mul_init(a[k * i + j], &g_tbls[j * 32]);

		gf_vect_dot_prod_base(TEST_LEN, k, g_tbls, buffs, buffs[i]);
	}

	// Random buffers in erasure
	memset(src_in_err, 0, TEST_SOURCES);
	for (i = 0, nerrs = 0; i < k && nerrs < m - k; i++) {
		err = 1 & rand();
		src_in_err[i] = err;
		if (err)
			src_err_list[nerrs++] = i;
	}

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

	if (gf_invert_matrix((u8 *) b, (u8 *) d, k) < 0)
		printf("BAD MATRIX\n");

	for (i = 0, r = 0; i < k; i++, r++) {
		while (src_in_err[r]) {
			r++;
			continue;
		}
		recov[i] = buffs[r];
	}

	// Recover data
	for (i = 0; i < nerrs; i++) {
		for (j = 0; j < k; j++)
			gf_vect_mul_init(d[k * src_err_list[i] + j], &g_tbls[j * 32]);

		gf_vect_dot_prod_base(TEST_LEN, k, g_tbls, recov, temp_buff);

		if (0 != memcmp(temp_buff, buffs[src_err_list[i]], TEST_LEN)) {
			printf("Fail error recovery (%d, %d, %d)\n", m, k, nerrs);
			printf("recov %d:", src_err_list[i]);
			dump(temp_buff, 25);
			printf("orig   :");
			dump(buffs[src_err_list[i]], 25);
			return -1;
		}
	}

	// Do more random tests

	for (rtest = 0; rtest < RANDOMS; rtest++) {
		while ((m = (rand() % MMAX)) < 2) ;
		while ((k = (rand() % KMAX)) >= m || k < 1) ;

		if (m > MMAX || k > KMAX)
			continue;

		gf_gen_cauchy1_matrix(a, m, k);

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

		// Make parity vects
		for (i = k; i < m; i++) {
			for (j = 0; j < k; j++)
				gf_vect_mul_init(a[k * i + j], &g_tbls[j * 32]);

			gf_vect_dot_prod_base(TEST_LEN, k, g_tbls, buffs, buffs[i]);
		}

		// Random errors
		memset(src_in_err, 0, TEST_SOURCES);
		for (i = 0, nerrs = 0; i < k && nerrs < m - k; i++) {
			err = 1 & rand();
			src_in_err[i] = err;
			if (err)
				src_err_list[nerrs++] = i;
		}
		if (nerrs == 0) {	// should have at least one error
			while ((err = (rand() % KMAX)) >= k) ;
			src_err_list[nerrs++] = err;
			src_in_err[err] = 1;
		}
		// construct b by removing error rows
		for (i = 0, r = 0; i < k; i++, r++) {
			while (src_in_err[r]) {
				r++;
				continue;
			}
			for (j = 0; j < k; j++)
				b[k * i + j] = a[k * r + j];
		}

		if (gf_invert_matrix((u8 *) b, (u8 *) d, k) < 0)
			printf("BAD MATRIX\n");

		for (i = 0, r = 0; i < k; i++, r++) {
			while (src_in_err[r]) {
				r++;
				continue;
			}
			recov[i] = buffs[r];
		}

		// Recover data
		for (i = 0; i < nerrs; i++) {
			for (j = 0; j < k; j++)
				gf_vect_mul_init(d[k * src_err_list[i] + j], &g_tbls[j * 32]);

			gf_vect_dot_prod_base(TEST_LEN, k, g_tbls, recov, temp_buff);

			if (0 != memcmp(temp_buff, buffs[src_err_list[i]], TEST_LEN)) {
				printf("Fail error recovery (%d, %d, %d) - ", m, k, nerrs);
				printf(" - erase list = ");
				for (i = 0; i < nerrs; i++)
					printf(" %d", src_err_list[i]);
				printf("\na:\n");
				dump_u8xu8((u8 *) a, m, k);
				printf("inv b:\n");
				dump_u8xu8((u8 *) d, k, k);
				printf("orig data:\n");
				dump_matrix(buffs, m, 25);
				printf("orig   :");
				dump(buffs[src_err_list[i]], 25);
				printf("recov %d:", src_err_list[i]);
				dump(temp_buff, 25);
				return -1;
			}
		}
		putchar('.');
	}

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