/*
 * Copyright 2012 Samy Al Bahra.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <ck_ht.h>

#ifdef CK_F_HT

#include <assert.h>
#include <ck_malloc.h>
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "../../common.h"

static ck_ht_t ht;
static char **keys;
static size_t keys_length = 0;
static size_t keys_capacity = 128;

static void *
ht_malloc(size_t r)
{

	return malloc(r);
}

static void
ht_free(void *p, size_t b, bool r)
{

	(void)b;
	(void)r;

	free(p);

	return;
}

static struct ck_malloc my_allocator = {
	.malloc = ht_malloc,
	.free = ht_free
};

static void
table_init(void)
{

	srand48((long int)time(NULL));
	ck_ht_allocator_set(&my_allocator);
	if (ck_ht_init(&ht, CK_HT_MODE_BYTESTRING, 8, lrand48()) == false) {
		perror("ck_ht_init");
		exit(EXIT_FAILURE);
	}

	return;
}

static bool
table_remove(const char *value)
{
	ck_ht_entry_t entry;
	ck_ht_hash_t h;
	size_t l = strlen(value);

	ck_ht_hash(&h, &ht, value, l);
	ck_ht_entry_key_set(&entry, value, l);
	return ck_ht_remove_spmc(&ht, h, &entry);
}

static bool
table_replace(const char *value)
{
	ck_ht_entry_t entry;
	ck_ht_hash_t h;
	size_t l = strlen(value);

	ck_ht_hash(&h, &ht, value, l);
	ck_ht_entry_set(&entry, h, value, l, "REPLACED");
	return ck_ht_set_spmc(&ht, h, &entry);
}

static void *
table_get(const char *value)
{
	ck_ht_entry_t entry;
	ck_ht_hash_t h;
	size_t l = strlen(value);

	ck_ht_hash(&h, &ht, value, l);
	ck_ht_entry_key_set(&entry, value, l);
	if (ck_ht_get_spmc(&ht, h, &entry) == true)
		return ck_ht_entry_value(&entry);

	return NULL;
}

static bool
table_insert(const char *value)
{
	ck_ht_entry_t entry;
	ck_ht_hash_t h;
	size_t l = strlen(value);

	ck_ht_hash(&h, &ht, value, l);
	ck_ht_entry_set(&entry, h, value, l, "VALUE");
	return ck_ht_put_spmc(&ht, h, &entry);
}

static size_t
table_count(void)
{

	return ck_ht_count(&ht);
}

static bool
table_reset(void)
{

	return ck_ht_reset_spmc(&ht);
}

int
main(int argc, char *argv[])
{
	FILE *fp;
	char buffer[512];
	size_t i, j, r;
	unsigned int d = 0;
	uint64_t s, e, a;
	char **t;

	r = 20;
	s = 8;

	if (argc < 2) {
		fprintf(stderr, "Usage: ck_ht <dictionary> [<repetitions> <initial size>]\n");
		exit(EXIT_FAILURE);
	}

	if (argc >= 3)
		r = atoi(argv[2]);

	if (argc >= 4)
		s = (uint64_t)atoi(argv[3]);

	keys = malloc(sizeof(char *) * keys_capacity);
	assert(keys != NULL);

	fp = fopen(argv[1], "r");
	assert(fp != NULL);

	while (fgets(buffer, sizeof(buffer), fp) != NULL) {
		buffer[strlen(buffer) - 1] = '\0';
		keys[keys_length++] = strdup(buffer);
		assert(keys[keys_length - 1] != NULL);

		if (keys_length == keys_capacity) {
			t = realloc(keys, sizeof(char *) * (keys_capacity *= 2));
			assert(t != NULL);
			keys = t;
		}
	}

	t = realloc(keys, sizeof(char *) * keys_length);
	assert(t != NULL);
	keys = t;

	table_init();

	for (i = 0; i < keys_length; i++)
		d += table_insert(keys[i]) == false;

	fprintf(stderr, "%zu entries stored and %u duplicates.\n\n",
	    table_count(), d);

	a = 0;
	for (j = 0; j < r; j++) {
		if (table_reset() == false) {
			fprintf(stderr, "ERROR: Failed to reset hash table.\n");
			exit(EXIT_FAILURE);
		}

		s = rdtsc();
		for (i = 0; i < keys_length; i++)
			d += table_insert(keys[i]) == false;
		e = rdtsc();
		a += e - s;
	}
	printf("Serial insertion: %" PRIu64 " ticks\n", a / (r * keys_length));

	a = 0;
	for (j = 0; j < r; j++) {
		s = rdtsc();
		for (i = 0; i < keys_length; i++)
			table_replace(keys[i]);
		e = rdtsc();
		a += e - s;
	}
	printf("  Serial replace: %" PRIu64 " ticks\n", a / (r * keys_length));

	a = 0;
	for (j = 0; j < r; j++) {
		s = rdtsc();
		for (i = 0; i < keys_length; i++) {
			if (table_get(keys[i]) == NULL) {
				fprintf(stderr, "ERROR: Unexpected NULL value.\n");
				exit(EXIT_FAILURE);
			}
		}
		e = rdtsc();
		a += e - s;
	}
	printf("      Serial get: %" PRIu64 " ticks\n", a / (r * keys_length));

	a = 0;
	for (j = 0; j < r; j++) {
		s = rdtsc();
		for (i = 0; i < keys_length; i++)
			table_remove(keys[i]);
		e = rdtsc();
		a += e - s;

		for (i = 0; i < keys_length; i++)
			table_insert(keys[i]);
	}
	printf("   Serial remove: %" PRIu64 " ticks\n", a / (r * keys_length));

	a = 0;
	for (j = 0; j < r; j++) {
		s = rdtsc();
		for (i = 0; i < keys_length; i++) {
			table_get("\x50\x03\x04\x05\x06\x10");
		}
		e = rdtsc();
		a += e - s;
	}
	printf("    Negative get: %" PRIu64 " ticks\n", a / (r * keys_length));

	return 0;
}
#else
int
main(void)
{

	return 0;
}
#endif /* CK_F_HT */