/*
 *    io_nix.c
 *
 *	  This file is part of WiiC, written by:
 *		Gabriele Randelli
 *		Email: randelli@dis.uniroma1.it
 *
 *    Copyright 2010
 *		
 *	  This file is based on Wiiuse, written By:
 *		Michael Laforest	< para >
 *		Email: < thepara (--AT--) g m a i l [--DOT--] com >
 *
 *	  Copyright 2006-2007
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    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, see <http://www.gnu.org/licenses/>.
 *
 *	  $Header$
 */

/**
 *	@file
 *	@brief Handles device I/O for *nix.
 */

#ifndef __APPLE__

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/l2cap.h>

#include "definitions.h"
#include "wiic_internal.h"
#include "io.h"

/**
 *	@brief Find a wiimote or wiimotes.
 *
 *	@param wm			An array of wiimote_t structures.
 *	@param max_wiimotes	The number of wiimote structures in \a wm.
 *	@param timeout		The number of seconds before the search times out.
 *
 *	@return The number of wiimotes found.
 *
 *	@see wiimote_connect()
 *
 *	This function will only look for wiimote devices.						\n
 *	When a device is found the address in the structures will be set.		\n
 *	You can then call wiimote_connect() to connect to the found				\n
 *	devices.
 */
int wiic_find(struct wiimote_t** wm, int max_wiimotes, int timeout) {
	int device_id;
	int device_sock;
	int found_devices;
	int found_wiimotes;

	/* reset all wiimote bluetooth device addresses */
	for (found_wiimotes = 0; found_wiimotes < max_wiimotes; ++found_wiimotes)
		wm[found_wiimotes]->bdaddr = *BDADDR_ANY;
	found_wiimotes = 0;

	/* get the id of the first bluetooth device. */
	device_id = hci_get_route(NULL);
	if (device_id < 0) {
		perror("hci_get_route");
		return 0;
	}

	/* create a socket to the device */
	device_sock = hci_open_dev(device_id);
	if (device_sock < 0) {
		perror("hci_open_dev");
		return 0;
	}

	inquiry_info scan_info_arr[128];
	inquiry_info* scan_info = scan_info_arr;
	memset(&scan_info_arr, 0, sizeof(scan_info_arr));

	/* scan for bluetooth devices for 'timeout' seconds */
	if(timeout)
		found_devices = hci_inquiry(device_id, timeout, 128, NULL, &scan_info, IREQ_CACHE_FLUSH);
	else {
		while(!(found_devices = hci_inquiry(device_id, 5, 128, NULL, &scan_info, IREQ_CACHE_FLUSH))) ; // Unlimited inquiry
	}
		
	if (found_devices < 0) {
		perror("hci_inquiry");
		return 0;
	}

	WIIC_INFO("Found %i bluetooth device(s).", found_devices);

	int i = 0;

	/* display discovered devices */
	for (; (i < found_devices) && (found_wiimotes < max_wiimotes); ++i) {
		if ((scan_info[i].dev_class[0] == WM_DEV_CLASS_0) &&
			(scan_info[i].dev_class[1] == WM_DEV_CLASS_1) &&
			(scan_info[i].dev_class[2] == WM_DEV_CLASS_2))
		{
			/* found a device */
			ba2str(&scan_info[i].bdaddr, wm[found_wiimotes]->bdaddr_str);

			WIIC_INFO("Found wiimote (%s) [id %i].", wm[found_wiimotes]->bdaddr_str, wm[found_wiimotes]->unid);

			wm[found_wiimotes]->bdaddr = scan_info[i].bdaddr;
			WIIMOTE_ENABLE_STATE(wm[found_wiimotes], WIIMOTE_STATE_DEV_FOUND);
			++found_wiimotes;
		}
	}

	close(device_sock);
	return found_wiimotes;
}


/**
 *	@brief Connect to a wiimote or wiimotes once an address is known.
 *
 *	@param wm			An array of wiimote_t structures.
 *	@param wiimotes		The number of wiimote structures in \a wm.
 *  @param autoreconnect	Re-connects the device in case of unexpected disconnection.
 *
 *	@return The number of wiimotes that successfully connected.
 *
 *	@see wiic_find()
 *	@see wiic_connect_single()
 *	@see wiic_disconnect()
 *
 *	Connect to a number of wiimotes when the address is already set
 *	in the wiimote_t structures.  These addresses are normally set
 *	by the wiic_find() function, but can also be set manually.
 */
int wiic_connect(struct wiimote_t** wm, int wiimotes, int autoreconnect) 
{
	int connected = 0;
	int i = 0;

	for (; i < wiimotes; ++i) {
		if (!WIIMOTE_IS_SET(wm[i], WIIMOTE_STATE_DEV_FOUND))
			/* if the device address is not set, skip it */
			continue;
		
		if (wiic_connect_single(wm[i], NULL, autoreconnect)) {
			++connected;
		}
	}

	return connected;
}

/**
 *	@brief Load Wii devices registered in the wiimotes.config file.
 *
 *	@param wm			An array of wiimote_t structures.
 *
 *	@return The number of wiimotes successfully loaded.
 *
 *	@see wiic_find()
 *  @see wiic_connect()
 *	@see wiic_connect_single()
 *	@see wiic_disconnect()
 *
 *	Up to version 0.53, it is possible to register the MAC address of your 
 *  Wii devices. This allows to automatically load them, without waiting for any
 *  search timeout. To register a new device, go to: <HOME_DIR>/.wiic/ and
 *  edit the file wiimotes.config, by adding the MAC address of the device 
 *  you want to register (one line per MAC address).
 */
int wiic_load(struct wiimote_t** wm) 
{
	int loaded = 0;
	int i = 0;
	char str[200];
	char* str_ptr = 0;
	char configPath[100];
	char* tmp = 0;
	
	// Retrieve the HOME environment variable
	tmp = getenv("HOME");
	strcpy(configPath,tmp);
	strncat(configPath,"/.wiic/wiimotes.config",22);

	// Open the config file
	FILE* fd = 0;
	fd = fopen(configPath,"r");
	if(!fd) 
		return loaded;

	// Read line by line
	while(fgets(str,sizeof(str),fd) != NULL && loaded < 1) {
		int len = strlen(str)-1;
      	if(str[len] == '\n') 
        	str[len] = 0;
		loaded++;
	}
	
	// We initialize the device structure
	for (; i < loaded; ++i) {
		/* found a device */
		strncpy(wm[i]->bdaddr_str,str,18);
		str_ptr = str;
		str2ba(str_ptr,&(wm[i]->bdaddr));
		WIIMOTE_ENABLE_STATE(wm[i], WIIMOTE_STATE_DEV_FOUND);
		WIIC_INFO("Loaded Wiimote (%s) [id %i].",wm[i]->bdaddr_str,wm[i]->unid);
	}

	return loaded;
}

/**
 *	@brief Connect to a wiimote with a known address.
 *
 *	@param wm		Pointer to a wiimote_t structure.
 *	@param address	The address of the device to connect to.
 *					If NULL, use the address in the struct set by wiic_find().
 *	@param autoreconnect	Re-connect to the device in case of unexpected disconnection.
 *
 *	@return 1 on success, 0 on failure
 */
int wiic_connect_single(struct wiimote_t* wm, char* address, int autoreconnect) {
	struct sockaddr_l2 addr;
	memset(&addr, 0, sizeof(addr));

	if (!wm || WIIMOTE_IS_CONNECTED(wm))
		return 0;

	addr.l2_family = AF_BLUETOOTH;

	if (address) 
		/* use provided address */
		str2ba(address, &addr.l2_bdaddr);
	else
		/* use address of device discovered */
		addr.l2_bdaddr = wm->bdaddr;

	/*
	 *	OUTPUT CHANNEL
	 */
	wm->out_sock = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
	if (wm->out_sock == -1)
		return 0;

	addr.l2_psm = htobs(WM_OUTPUT_CHANNEL);

	/* connect to wiimote */
	if (connect(wm->out_sock, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
		perror("connect() output sock");
		return 0;
	}

	/*
	 *	INPUT CHANNEL
	 */
	wm->in_sock = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
	if (wm->in_sock == -1) {
		close(wm->out_sock);
		wm->out_sock = -1;
		return 0;
	}

	addr.l2_psm = htobs(WM_INPUT_CHANNEL);

	/* connect to wiimote */
	if (connect(wm->in_sock, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
		perror("connect() interrupt sock");
		close(wm->out_sock);
		wm->out_sock = -1;
		return 0;
	}
	
	/* autoreconnect flag */
	wm->autoreconnect = autoreconnect;

	WIIC_INFO("Connected to wiimote [id %i].", wm->unid);

	/* do the handshake */
	WIIMOTE_ENABLE_STATE(wm, WIIMOTE_STATE_CONNECTED);
	wiic_handshake(wm, NULL, 0);

	wiic_set_report_type(wm);

	return 1;
}


/**
 *	@brief Disconnect a wiimote.
 *
 *	@param wm		Pointer to a wiimote_t structure.
 *
 *	@see wiic_connect()
 *
 *	Note that this will not free the wiimote structure.
 */
void wiic_disconnect(struct wiimote_t* wm) {
	if (!wm || !WIIMOTE_IS_CONNECTED(wm))
		return;

	close(wm->out_sock);
	close(wm->in_sock);

	wm->out_sock = -1;
	wm->in_sock = -1;
	wm->event = WIIC_NONE;

	WIIMOTE_DISABLE_STATE(wm, WIIMOTE_STATE_CONNECTED);
	WIIMOTE_DISABLE_STATE(wm, WIIMOTE_STATE_HANDSHAKE);
}


int wiic_io_read(struct wiimote_t* wm) {
	/* not used */
	return 0;
}


int wiic_io_write(struct wiimote_t* wm, byte* buf, int len) {
	return write(wm->out_sock, buf, len);
}


#endif /* ifndef __APPLE__ */