/*-
 * Copyright 2016 Vsevolod Stakhov
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "config.h"
#include "rspamd.h"
#include "util.h"
#include "libutil/fstring.h"
#include "libutil/http.h"
#include "libutil/http_private.h"
#include "ottery.h"
#include "cryptobox.h"
#include "keypair.h"
#include "unix-std.h"
#include <math.h>

#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif

static guint port = 43000;
static guint cache_size = 10;
static guint nworkers = 1;
static gboolean openssl_mode = FALSE;
static GHashTable *maps = NULL;
static gchar *key = NULL;
static struct rspamd_keypair_cache *c;
static struct rspamd_cryptobox_keypair *server_key;
static struct timeval io_tv = {
	.tv_sec = 20,
	.tv_usec = 0};

static GOptionEntry entries[] = {
	{"port", 'p', 0, G_OPTION_ARG_INT, &port,
	 "Port number (default: 43000)", NULL},
	{"cache", 'c', 0, G_OPTION_ARG_INT, &cache_size,
	 "Keys cache size (default: 10)", NULL},
	{"workers", 'n', 0, G_OPTION_ARG_INT, &nworkers,
	 "Number of workers to start (default: 1)", NULL},
	{"openssl", 'o', 0, G_OPTION_ARG_NONE, &openssl_mode,
	 "Use openssl crypto", NULL},
	{"key", 'k', 0, G_OPTION_ARG_STRING, &key,
	 "Use static keypair instead of new one (base32 encoded sk || pk)", NULL},
	{NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};

struct rspamd_http_server_session {
	struct rspamd_http_connection *conn;
	struct ev_loop *ev_base;
	guint req_size;
	gboolean reply;
	gint fd;
};

static void
rspamd_server_error(struct rspamd_http_connection *conn,
					GError *err)
{
	struct rspamd_http_server_session *session = conn->ud;

	rspamd_fprintf(stderr, "http error occurred: %s\n", err->message);
	rspamd_http_connection_unref(conn);
	close(session->fd);
	g_slice_free1(sizeof(*session), session);
}

static int
rspamd_server_finish(struct rspamd_http_connection *conn,
					 struct rspamd_http_message *msg)
{
	struct rspamd_http_server_session *session = conn->ud;
	struct rspamd_http_message *reply;
	gulong size;
	const gchar *url_str;
	guint url_len;
	rspamd_fstring_t *body;

	if (!session->reply) {
		session->reply = TRUE;
		reply = rspamd_http_new_message(HTTP_RESPONSE);
		url_str = msg->url->str;
		url_len = msg->url->len;

		if (url_str[0] == '/') {
			url_str++;
			url_len--;
		}

		if (rspamd_strtoul(url_str, url_len, &size)) {
			session->req_size = size;

			reply->code = 200;
			reply->status = rspamd_fstring_new_init("OK", 2);
			body = rspamd_fstring_sized_new(size);
			body->len = size;
			memset(body->str, 0, size);
			rspamd_http_message_set_body_from_fstring_steal(msg, body);
		}
		else {
			reply->code = 404;
			reply->status = rspamd_fstring_new_init("Not found", 9);
		}

		rspamd_http_connection_reset(conn);
		rspamd_http_connection_write_message(conn, reply, NULL,
											 "application/octet-stream", session, session->fd,
											 &io_tv, session->ev_base);
	}
	else {
		/* Destroy session */
		rspamd_http_connection_unref(conn);
		close(session->fd);
		g_slice_free1(sizeof(*session), session);
	}

	return 0;
}

static void
rspamd_server_accept(gint fd, short what, void *arg)
{
	struct ev_loop *ev_base = arg;
	struct rspamd_http_server_session *session;
	rspamd_inet_addr_t *addr;
	gint nfd;

	do {
		if ((nfd =
				 rspamd_accept_from_socket(fd, &addr, NULL)) == -1) {
			rspamd_fprintf(stderr, "accept failed: %s", strerror(errno));
			return;
		}
		/* Check for EAGAIN */
		if (nfd == 0) {
			rspamd_inet_address_free(addr);
			return;
		}

		rspamd_inet_address_free(addr);
		session = g_slice_alloc(sizeof(*session));
		session->conn = rspamd_http_connection_new(NULL,
												   rspamd_server_error,
												   rspamd_server_finish,
												   0,
												   RSPAMD_HTTP_SERVER,
												   c,
												   NULL);
		rspamd_http_connection_set_key(session->conn, server_key);
		rspamd_http_connection_read_message(session->conn,
											session,
											nfd,
											&io_tv,
											ev_base);
		session->reply = FALSE;
		session->fd = nfd;
		session->ev_base = ev_base;
	} while (nfd > 0);
}

static void
rspamd_http_term_handler(gint fd, short what, void *arg)
{
	struct ev_loop *ev_base = arg;
	struct timeval tv = {0, 0};

	event_base_loopexit(ev_base, &tv);
}

static void
rspamd_http_server_func(gint fd, rspamd_inet_addr_t *addr)
{
	struct ev_loop *ev_base = event_init();
	struct event accept_ev, term_ev;

	event_set(&accept_ev, fd, EV_READ | EV_PERSIST, rspamd_server_accept, ev_base);
	event_base_set(ev_base, &accept_ev);
	event_add(&accept_ev, NULL);

	evsignal_set(&term_ev, SIGTERM, rspamd_http_term_handler, ev_base);
	event_base_set(ev_base, &term_ev);
	event_add(&term_ev, NULL);

	event_base_loop(ev_base, 0);
}

static void
rspamd_http_start_servers(pid_t *sfd, rspamd_inet_addr_t *addr)
{
	guint i;
	gint fd;

	fd = rspamd_inet_address_listen(addr, SOCK_STREAM, TRUE);
	g_assert(fd != -1);

	for (i = 0; i < nworkers; i++) {
		sfd[i] = fork();
		g_assert(sfd[i] != -1);

		if (sfd[i] == 0) {
			rspamd_http_server_func(fd, addr);
			exit(EXIT_SUCCESS);
		}
	}

	close(fd);
}

static void
rspamd_http_stop_servers(pid_t *sfd)
{
	guint i;
	gint res;

	for (i = 0; i < nworkers; i++) {
		kill(sfd[i], SIGTERM);
		wait(&res);
	}
}

static void
rspamd_http_server_term(int fd, short what, void *arg)
{
	pid_t *sfd = arg;

	rspamd_http_stop_servers(sfd);
	event_loopexit(NULL);
}

int main(int argc, gchar **argv)
{
	GOptionContext *context;
	GError *error = NULL;
	struct ev_loop *ev_base;
	GString *b32_key;
	pid_t *sfd;
	rspamd_inet_addr_t *addr;
	struct event term_ev, int_ev;
	struct in_addr ina = {INADDR_ANY};

	rspamd_init_libs();

	context = g_option_context_new(
		"rspamd-http-server - test server for benchmarks");
	g_option_context_set_summary(context,
								 "Summary:\n  Rspamd test HTTP server " RVERSION
								 "\n  Release id: " RID);
	g_option_context_add_main_entries(context, entries, NULL);

	if (!g_option_context_parse(context, &argc, &argv, &error)) {
		rspamd_fprintf(stderr, "option parsing failed: %s\n", error->message);
		g_error_free(error);
		exit(EXIT_FAILURE);
	}

	maps = g_hash_table_new(g_int_hash, g_int_equal);

	if (key == NULL) {
		server_key = rspamd_keypair_new(RSPAMD_KEYPAIR_KEX,
										openssl_mode ? RSPAMD_CRYPTOBOX_MODE_NIST : RSPAMD_CRYPTOBOX_MODE_25519);
		b32_key = rspamd_keypair_print(server_key,
									   RSPAMD_KEYPAIR_PUBKEY | RSPAMD_KEYPAIR_BASE32);
		rspamd_printf("key: %v\n", b32_key);
	}
	else {
		/* TODO: add key loading */
	}

	if (cache_size > 0) {
		c = rspamd_keypair_cache_new(cache_size);
	}

	sfd = g_alloca(sizeof(*sfd) * nworkers);
	addr = rspamd_inet_address_new(AF_INET, &ina);
	rspamd_inet_address_set_port(addr, port);
	rspamd_http_start_servers(sfd, addr);

	/* Just wait for workers */
	ev_base = event_init();

	event_set(&term_ev, SIGTERM, EV_SIGNAL, rspamd_http_server_term, sfd);
	event_base_set(ev_base, &term_ev);
	event_add(&term_ev, NULL);
	event_set(&int_ev, SIGINT, EV_SIGNAL, rspamd_http_server_term, sfd);
	event_base_set(ev_base, &int_ev);
	event_add(&int_ev, NULL);

	event_base_loop(ev_base, 0);

	return 0;
}