/*
 *
 *  oFono - Open Source Telephony
 *
 *  Copyright (C) 2008-2011  Intel Corporation. All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#define _GNU_SOURCE
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#include <glib.h>

#include <ofono/log.h>
#include <ofono/modem.h>
#include <ofono/gprs-context.h>

#include "gatchat.h"
#include "gatresult.h"

#include "hsomodem.h"

#define HSO_DISCONNECTED 0
#define HSO_CONNECTED 1
#define HSO_CONNECTING 2
#define HSO_FAILED 3

#define AUTH_BUF_LENGTH OFONO_GPRS_MAX_USERNAME_LENGTH + \
			OFONO_GPRS_MAX_PASSWORD_LENGTH + 128

#define STATIC_IP_NETMASK "255.255.255.255"

static const char *none_prefix[] = { NULL };
static const char *owandata_prefix[] = { "_OWANDATA:", NULL };

enum hso_state {
	HSO_NONE = 0,
	HSO_ENABLING = 1,
	HSO_DISABLING = 2,
};

struct gprs_context_data {
	GAtChat *chat;
	unsigned int active_context;			/* Currently active */
	enum hso_state hso_state;			/* Are we in req ? */
	ofono_gprs_context_cb_t cb;
	void *cb_data;					/* Callback data */
	int owancall;					/* State of the call */
};

static void at_owancall_down_cb(gboolean ok, GAtResult *result,
				gpointer user_data)
{
	struct cb_data *cbd = user_data;
	ofono_gprs_context_cb_t cb = cbd->cb;
	struct ofono_gprs_context *gc = cbd->user;
	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);
	struct ofono_error error;

	/* Now we have to wait for the unsolicited notification to arrive */
	if (ok && gcd->owancall != 0) {
		gcd->hso_state = HSO_DISABLING;
		gcd->cb = cb;
		gcd->cb_data = cbd->data;
		return;
	}

	decode_at_error(&error, g_at_result_final_response(result));
	cb(&error, cbd->data);
}

static void at_owancall_up_cb(gboolean ok, GAtResult *result,
				gpointer user_data)
{
	struct cb_data *cbd = user_data;
	ofono_gprs_context_cb_t cb = cbd->cb;
	struct ofono_gprs_context *gc = cbd->user;
	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);
	struct ofono_error error;

	if (ok) {
		gcd->hso_state = HSO_ENABLING;
		gcd->cb = cb;
		gcd->cb_data = cbd->data;
		return;
	}

	gcd->active_context = 0;

	decode_at_error(&error, g_at_result_final_response(result));
	cb(&error, cbd->data);
}

static void hso_cgdcont_cb(gboolean ok, GAtResult *result, gpointer user_data)
{
	struct cb_data *cbd = user_data;
	ofono_gprs_context_cb_t cb = cbd->cb;
	struct ofono_gprs_context *gc = cbd->user;
	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);
	struct cb_data *ncbd;
	char buf[64];

	if (!ok) {
		struct ofono_error error;

		gcd->active_context = 0;

		decode_at_error(&error, g_at_result_final_response(result));
		cb(&error, cbd->data);
		return;
	}

	ncbd = g_memdup(cbd, sizeof(struct cb_data));

	snprintf(buf, sizeof(buf), "AT_OWANCALL=%u,1,1", gcd->active_context);

	if (g_at_chat_send(gcd->chat, buf, none_prefix,
				at_owancall_up_cb, ncbd, g_free) > 0)
		return;

	g_free(ncbd);

	gcd->active_context = 0;

	CALLBACK_WITH_FAILURE(cb, cbd->data);
}

static void hso_gprs_activate_primary(struct ofono_gprs_context *gc,
				const struct ofono_gprs_primary_context *ctx,
				ofono_gprs_context_cb_t cb, void *data)
{
	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);
	struct cb_data *cbd = cb_data_new(cb, data);
	char buf[AUTH_BUF_LENGTH];
	int len;

	/* IPv6 support not implemented */
	if (ctx->proto != OFONO_GPRS_PROTO_IP)
		goto error;

	gcd->active_context = ctx->cid;

	cbd->user = gc;

	if (ctx->username[0] && ctx->password[0])
		snprintf(buf, sizeof(buf), "AT$QCPDPP=%u,1,\"%s\",\"%s\"",
			ctx->cid, ctx->password, ctx->username);
	else if (ctx->password[0])
		snprintf(buf, sizeof(buf), "AT$QCPDPP=%u,2,,\"%s\"",
				ctx->cid, ctx->password);
	else
		snprintf(buf, sizeof(buf), "AT$QCPDPP=%u,0", ctx->cid);

	if (g_at_chat_send(gcd->chat, buf, none_prefix,
				NULL, NULL, NULL) == 0)
		goto error;

	len = snprintf(buf, sizeof(buf), "AT+CGDCONT=%u,\"IP\"", ctx->cid);

	if (ctx->apn)
		snprintf(buf + len, sizeof(buf) - len - 3, ",\"%s\"",
				ctx->apn);

	if (g_at_chat_send(gcd->chat, buf, none_prefix,
				hso_cgdcont_cb, cbd, g_free) > 0)
		return;

error:
	g_free(cbd);

	CALLBACK_WITH_FAILURE(cb, data);
}

static void hso_gprs_deactivate_primary(struct ofono_gprs_context *gc,
					unsigned int cid,
					ofono_gprs_context_cb_t cb, void *data)
{
	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);
	struct cb_data *cbd = cb_data_new(cb, data);
	char buf[128];

	cbd->user = gc;

	snprintf(buf, sizeof(buf), "AT_OWANCALL=%u,0,1", cid);

	if (g_at_chat_send(gcd->chat, buf, none_prefix,
				at_owancall_down_cb, cbd, g_free) > 0)
		return;

	g_free(cbd);

	CALLBACK_WITH_FAILURE(cb, data);
}

static void owandata_cb(gboolean ok, GAtResult *result, gpointer user_data)
{
	struct ofono_gprs_context *gc = user_data;
	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);
	GAtResultIter iter;
	int cid;
	const char *ip = NULL;
	const char *gateway = NULL;
	const char *dns1 = NULL;
	const char *dns2 = NULL;
	const char *dns[3];
	struct ofono_modem *modem;
	const char *interface;

	if (!ok)
		return;

	g_at_result_iter_init(&iter, result);

	if (g_at_result_iter_next(&iter, "_OWANDATA:") == FALSE)
		return;

	g_at_result_iter_next_number(&iter, &cid);
	g_at_result_iter_next_unquoted_string(&iter, &ip);
	g_at_result_iter_next_unquoted_string(&iter, &gateway);
	g_at_result_iter_next_unquoted_string(&iter, &dns1);
	g_at_result_iter_next_unquoted_string(&iter, &dns2);

	if (ip && ip[0] == ' ')
		ip += 1;

	if (gateway && gateway[0] == ' ')
		gateway += 1;

	if (dns1 && dns1[0] == ' ')
		dns1 += 1;

	if (dns2 && dns2[0] == ' ')
		dns2 += 1;

	/* Don't bother reporting the same DNS twice */
	if (g_str_equal(dns1, dns2))
		dns2 = NULL;

	dns[0] = dns1;
	dns[1] = dns2;
	dns[2] = 0;

	modem = ofono_gprs_context_get_modem(gc);
	interface = ofono_modem_get_string(modem, "NetworkInterface");

	ofono_info("Got the following parameters for context: %d", cid);
	ofono_info("IP: %s, Gateway: %s", ip, gateway);
	ofono_info("DNS: %s, %s", dns1, dns2);

	ofono_gprs_context_set_interface(gc, interface);
	ofono_gprs_context_set_ipv4_address(gc, ip, TRUE);
	ofono_gprs_context_set_ipv4_netmask(gc, STATIC_IP_NETMASK);
	ofono_gprs_context_set_ipv4_gateway(gc, gateway);
	ofono_gprs_context_set_ipv4_dns_servers(gc, dns);

	CALLBACK_WITH_SUCCESS(gcd->cb, gcd->cb_data);

	gcd->hso_state = HSO_NONE;
	gcd->cb = NULL;
	gcd->cb_data = NULL;
}

static void owancall_notifier(GAtResult *result, gpointer user_data)
{
	struct ofono_gprs_context *gc = user_data;
	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);
	GAtResultIter iter;
	int state;
	int cid;

	if (gcd->active_context == 0)
		return;

	g_at_result_iter_init(&iter, result);

	if (g_at_result_iter_next(&iter, "_OWANCALL:") == FALSE)
		return;

	g_at_result_iter_next_number(&iter, &cid);
	g_at_result_iter_next_number(&iter, &state);

	if (gcd->active_context != (unsigned int) cid)
		return;

	switch (state) {
	case HSO_DISCONNECTED:
		DBG("HSO Context: disconnected");

		if (gcd->hso_state == HSO_DISABLING) {
			CALLBACK_WITH_SUCCESS(gcd->cb, gcd->cb_data);
			gcd->hso_state = HSO_NONE;
			gcd->cb = NULL;
			gcd->cb_data = NULL;
		} else {
			ofono_gprs_context_deactivated(gc, gcd->active_context);
		}

		gcd->active_context = 0;
		break;

	case HSO_CONNECTED:
		DBG("HSO Context: connected");

		if (gcd->hso_state == HSO_ENABLING) {
			char buf[128];

			snprintf(buf, sizeof(buf), "AT_OWANDATA=%u",
					gcd->active_context);

			g_at_chat_send(gcd->chat, buf, owandata_prefix,
					owandata_cb, gc, NULL);
		}

		break;

	case HSO_FAILED:
		DBG("HSO Context: failed");

		if (gcd->hso_state == HSO_ENABLING) {
			CALLBACK_WITH_FAILURE(gcd->cb, gcd->cb_data);
			gcd->hso_state = HSO_NONE;
			gcd->cb = NULL;
			gcd->cb_data = NULL;
		}

		gcd->active_context = 0;
		break;

	default:
		break;
	};

	gcd->owancall = state;
}

static int hso_gprs_context_probe(struct ofono_gprs_context *gc,
					unsigned int vendor, void *data)
{
	GAtChat *chat = data;
	struct gprs_context_data *gcd;

	gcd = g_new0(struct gprs_context_data, 1);
	gcd->chat = g_at_chat_clone(chat);

	g_at_chat_register(gcd->chat, "_OWANCALL:", owancall_notifier,
				FALSE, gc, NULL);

	ofono_gprs_context_set_data(gc, gcd);

	return 0;
}

static void hso_gprs_context_remove(struct ofono_gprs_context *gc)
{
	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);

	ofono_gprs_context_set_data(gc, NULL);

	g_at_chat_unref(gcd->chat);
	g_free(gcd);
}

static const struct ofono_gprs_context_driver driver = {
	.name			= "hsomodem",
	.probe			= hso_gprs_context_probe,
	.remove			= hso_gprs_context_remove,
	.activate_primary	= hso_gprs_activate_primary,
	.deactivate_primary	= hso_gprs_deactivate_primary,
};

void hso_gprs_context_init(void)
{
	ofono_gprs_context_driver_register(&driver);
}

void hso_gprs_context_exit(void)
{
	ofono_gprs_context_driver_unregister(&driver);
}