/*
 *	wiiuse
 *
 *	Written By:
 *		Michael Laforest	< para >
 *		Email: < thepara (--AT--) g m a i l [--DOT--] com >
 *
 *	Copyright 2006-2007
 *
 *	This file is part of wiiuse.
 *
 *	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 WIN32

#include <sys/time.h>
#include <errno.h>

#include <sys/types.h>
#include <stdlib.h>
#include <math.h>
#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 "wiiuse_internal.h"
#include "io.h"
 
static int wiiuse_connect_single(struct wiimote_t* wm, char* address);

/**
 *	@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 wiiuse_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 */
	found_devices = hci_inquiry(device_id, timeout, 128, NULL, &scan_info, IREQ_CACHE_FLUSH);
	if (found_devices < 0) {
		perror("hci_inquiry");
		return 0;
	}

	WIIUSE_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);

			WIIUSE_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.
 *
 *	@return The number of wiimotes that successfully connected.
 *
 *	@see wiiuse_find()
 *	@see wiiuse_connect_single()
 *	@see wiiuse_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 wiiuse_find() function, but can also be set manually.
 */
int wiiuse_connect(struct wiimote_t** wm, int wiimotes) {
	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 (wiiuse_connect_single(wm[i], NULL))
			++connected;
	}

	return connected;
}


/**
 *	@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 wiiuse_find().
 *
 *	@return 1 on success, 0 on failure
 */
static int wiiuse_connect_single(struct wiimote_t* wm, char* address) {
	struct sockaddr_l2 addr;

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

	addr.l2_family = AF_BLUETOOTH;
	bdaddr_t *bdaddr = &wm->bdaddr;
	if (address)
		/* use provided address */
		str2ba(address, &addr.l2_bdaddr);
	else
	{
		bacmp(bdaddr, BDADDR_ANY);
		/* use address of device discovered */
		addr.l2_bdaddr = *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;
	}

	WIIUSE_INFO("Connected to wiimote [id %i].", wm->unid);
	/* do the handshake */
	WIIMOTE_ENABLE_STATE(wm, WIIMOTE_STATE_CONNECTED);
	
	wiiuse_set_report_type(wm);
	wiiuse_handshake(wm, NULL, 0);

	return 1;
}


/**
 *	@brief Disconnect a wiimote.
 *
 *	@param wm		Pointer to a wiimote_t structure.
 *
 *	@see wiiuse_connect()
 *
 *	Note that this will not free the wiimote structure.
 */
void wiiuse_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 = WIIUSE_NONE;

	WIIMOTE_DISABLE_STATE(wm, WIIMOTE_STATE_CONNECTED);
	WIIMOTE_DISABLE_STATE(wm, WIIMOTE_STATE_HANDSHAKE);
}
int wiiuse_io_read(struct wiimote_t* wm) {
	struct timeval tv;
	fd_set fds;
	int r;
	int i;
	if (!wm) 
		return 0;

	/* block select() for 1/2000th of a second */
	tv.tv_sec = 0;
	tv.tv_usec = 500;

	FD_ZERO(&fds);
	/* only poll it if it is connected */
	if (WIIMOTE_IS_SET(wm, WIIMOTE_STATE_CONNECTED)) {
		FD_SET(wm->in_sock, &fds);
		//highest_fd = wm[i]->in_sock;
	}
	else
		/* nothing to poll */
		return 0;

	if (select(wm->in_sock + 1, &fds, NULL, NULL, &tv) == -1) {
		WIIUSE_ERROR("Unable to select() the wiimote interrupt socket(s).");
		perror("Error Details");
		return 0;
	}

	/* if this wiimote is not connected, skip it */
	if (!WIIMOTE_IS_CONNECTED(wm))
		return 0;

	if (FD_ISSET(wm->in_sock, &fds)) 
	{
		/* read the pending message into the buffer */
		r = read(wm->in_sock, wm->event_buf, sizeof(wm->event_buf));
		if (r == -1) {
			/* error reading data */
			WIIUSE_ERROR("Receiving wiimote data (id %i).", wm->unid);
			perror("Error Details");

			if (errno == ENOTCONN) {
				/* this can happen if the bluetooth dongle is disconnected */
				WIIUSE_ERROR("Bluetooth appears to be disconnected.  Wiimote unid %i will be disconnected.", wm->unid);
				wiiuse_disconnect(wm);
				wm->event = WIIUSE_UNEXPECTED_DISCONNECT;
			}

			return 0;
		}
		if (!r) {
			/* remote disconnect */
			wiiuse_disconnected(wm);
			return 0;
		}
		memcpy(wm->event_buf, &wm->event_buf[1], sizeof(wm->event_buf) - 1);
		return 1;
	}
	return 0;
}


int wiiuse_io_write(struct wiimote_t* wm, byte* buf, int len) 
{
	if(buf[0] != (WM_SET_REPORT | WM_BT_OUTPUT))
	{
		// Linux and OSX need this, Windows strips it out
		// Only packets from Dolphin don't have the start
		// Wiiuse uses ifdefs to add the first byte without you ever knowing it
		// Should find out a nice way of doing this, getting windows to stop stripping the packets would be nice
		memcpy(buf + 1, buf, len - 1);
		buf[0] = (WM_SET_REPORT | WM_BT_OUTPUT);
	}
	return write(wm->out_sock, buf, len);
}



#endif /* ifndef WIN32 */