/*
 * Copyright (c) 2015 Jan Kolarik
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

/** @addtogroup nic
 * @{
 */
/** @file WiFi device configuration utility.
 *
 */

#include <ieee80211_iface.h>

#include <inet/inetcfg.h>
#include <inet/dhcp.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <str.h>
#include <str_error.h>
#include <loc.h>

#define NAME  "wifi_supplicant"

#define enum_name(name_arr, i) \
	((i < 0) ? "NA" : name_arr[i])

static const char *ieee80211_security_type_strs[] = {
	"OPEN", "WEP", "WPA", "WPA2"
};

static const char *ieee80211_security_alg_strs[] = {
	"WEP40", "WEP104", "CCMP", "TKIP"
};

static const char *ieee80211_security_auth_strs[] = {
	"PSK", "8021X"
};

static void print_syntax(void)
{
	printf("syntax:\n");
	printf("\t" NAME " [<cmd> [<args...>]]\n");
	printf("\t<cmd> is:\n");
	printf("\tlist - list wifi devices in <index>: <name> format\n");
	printf("\tscan <index> [-n] - output scan results (force scan "
	    "immediately)\n");
	printf("\tconnect <index> <ssid_prefix> [<password>] - connect to "
	    "network\n");
	printf("\tdisconnect <index> - disconnect from network\n");
}

static char *nic_addr_format(nic_address_t *addr)
{
	char *str;
	int rc = asprintf(&str, "%02x:%02x:%02x:%02x:%02x:%02x",
	    addr->address[0], addr->address[1], addr->address[2],
	    addr->address[3], addr->address[4], addr->address[5]);

	if (rc < 0)
		return NULL;

	return str;
}

static errno_t get_wifi_list(service_id_t **wifis, size_t *count)
{
	category_id_t wifi_cat;
	errno_t rc = loc_category_get_id("ieee80211", &wifi_cat, 0);
	if (rc != EOK) {
		printf("Error resolving category 'ieee80211'.\n");
		return rc;
	}

	rc = loc_category_get_svcs(wifi_cat, wifis, count);
	if (rc != EOK) {
		printf("Error getting list of WIFIs.\n");
		return rc;
	}

	return EOK;
}

static async_sess_t *get_wifi_by_index(size_t i)
{
	service_id_t *wifis = NULL;
	size_t count;

	errno_t rc = get_wifi_list(&wifis, &count);
	if (rc != EOK) {
		printf("Error fetching wifi list.\n");
		return NULL;
	}

	if (i >= count) {
		printf("Invalid wifi index.\n");
		free(wifis);
		return NULL;
	}

	async_sess_t *sess =
	    loc_service_connect(wifis[i], INTERFACE_DDF, 0);
	if (sess == NULL) {
		printf("Error connecting to service.\n");
		free(wifis);
		return NULL;
	}

	return sess;
}

static errno_t wifi_list(void)
{
	service_id_t *wifis = NULL;
	size_t count;

	errno_t rc = get_wifi_list(&wifis, &count);
	if (rc != EOK) {
		printf("Error fetching wifi list: %s\n", str_error(rc));
		return EINVAL;
	}

	printf("[Index]: [Service Name]\n");
	for (size_t i = 0; i < count; i++) {
		char *svc_name;
		rc = loc_service_get_name(wifis[i], &svc_name);
		if (rc != EOK) {
			printf("Error getting service name: %s\n", str_error(rc));
			free(wifis);
			return rc;
		}

		printf("%zu: %s\n", i, svc_name);

		free(svc_name);
	}

	return EOK;
}

static errno_t wifi_connect(uint32_t index, char *ssid_start, char *password)
{
	assert(ssid_start);

	async_sess_t *sess = get_wifi_by_index(index);
	if (sess == NULL) {
		printf("Specified WIFI doesn't exist or cannot connect to "
		    "it.\n");
		return EINVAL;
	}

	errno_t rc = ieee80211_disconnect(sess);
	if (rc != EOK) {
		if (rc == EREFUSED)
			printf("Device is not ready yet.\n");
		else
			printf("Error when disconnecting device: %s\n",
			    str_error(rc));

		return rc;
	}

	rc = ieee80211_connect(sess, ssid_start, password);
	if (rc != EOK) {
		if (rc == EREFUSED)
			printf("Device is not ready yet.\n");
		else if (rc == ETIMEOUT)
			printf("Timeout when authenticating to network.\n");
		else if (rc == ENOENT)
			printf("Given SSID not in scan results.\n");
		else
			printf("Error when connecting to network: %s\n",
			    str_error(rc));

		return rc;
	}

	// TODO: Wait for DHCP address?

	printf("Successfully connected to network!\n");

	return EOK;
}

static errno_t wifi_disconnect(uint32_t index)
{
	async_sess_t *sess = get_wifi_by_index(index);
	if (sess == NULL) {
		printf("Specified WIFI doesn't exist or cannot connect to "
		    "it.\n");
		return EINVAL;
	}

	errno_t rc = ieee80211_disconnect(sess);
	if (rc != EOK) {
		if (rc == EREFUSED)
			printf("Device is not ready yet.\n");
		else if (rc == EINVAL)
			printf("Not connected to any WiFi network.\n");
		else
			printf("Error when disconnecting from network: %s\n",
			    str_error(rc));

		return rc;
	}

	printf("Successfully disconnected.\n");

	return EOK;
}

static errno_t wifi_scan(uint32_t index, bool now)
{
	async_sess_t *sess = get_wifi_by_index(index);
	if (sess == NULL) {
		printf("Specified WIFI doesn't exist or cannot connect to "
		    "it.\n");
		return EINVAL;
	}

	ieee80211_scan_results_t scan_results;
	errno_t rc = ieee80211_get_scan_results(sess, &scan_results, now);
	if (rc != EOK) {
		if (rc == EREFUSED)
			printf("Device is not ready yet.\n");
		else
			printf("Failed to fetch scan results: %s\n",
			    str_error(rc));

		return rc;
	}

	if (scan_results.length == 0)
		return EOK;

	printf("%16.16s %17s %4s %5s %5s %7s %7s\n",
	    "SSID", "MAC", "CHAN", "TYPE", "AUTH", "UNI-ALG", "GRP-ALG");

	for (uint8_t i = 0; i < scan_results.length; i++) {
		ieee80211_scan_result_t result = scan_results.results[i];

		printf("%16.16s %17s %4d %5s %5s %7s %7s\n",
		    result.ssid, nic_addr_format(&result.bssid),
		    result.channel,
		    enum_name(ieee80211_security_type_strs, result.security.type),
		    enum_name(ieee80211_security_auth_strs, result.security.auth),
		    enum_name(ieee80211_security_alg_strs, result.security.pair_alg),
		    enum_name(ieee80211_security_alg_strs, result.security.group_alg));
	}

	return EOK;
}

int main(int argc, char *argv[])
{
	errno_t rc = inetcfg_init();
	if (rc != EOK) {
		printf("%s: Failed connecting to inetcfg service: %s.\n",
		    NAME, str_error(rc));
		return 1;
	}

	rc = dhcp_init();
	if (rc != EOK) {
		printf("%s: Failed connecting to dhcp service: %s.\n",
		    NAME, str_error(rc));
		return 1;
	}

	if (argc == 2) {
		if (!str_cmp(argv[1], "list"))
			return wifi_list();
	} else if (argc > 2) {
		uint32_t index;
		rc = str_uint32_t(argv[2], NULL, 10, false, &index);
		if (rc != EOK) {
			printf("%s: Invalid argument.\n", NAME);
			print_syntax();
			return EINVAL;
		}

		if (!str_cmp(argv[1], "scan")) {
			bool now = false;
			if (argc > 3)
				if (!str_cmp(argv[3], "-n"))
					now = true;

			return wifi_scan(index, now);
		} else if (!str_cmp(argv[1], "connect")) {
			char *pass = NULL;
			if (argc > 3) {
				if (argc > 4)
					pass = argv[4];

				return wifi_connect(index, argv[3], pass);
			}
		} else if (!str_cmp(argv[1], "disconnect"))
			return wifi_disconnect(index);
	}

	print_syntax();

	return EOK;
}

/** @}
 */