/* Copyright (C) 2007 L. Donnie Smith <cwiid@abstrakraft.org>
 *
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *  ChangeLog:
 *  2007-05-16 L. Donnie Smith <cwiid@abstrakraft.org>
 *  * send error_mesg from process_error
 *
 *  2007-05-14 L. Donnie Smith <cwiid@abstrakraft.org>
 *  * added timestamp to message array
 *
 *  2007-04-24 L. Donnie Smith <cwiid@abstrakraft.org>
 *  * rewrite for API overhaul (renamed from event.c)
 *
 *  2007-04-09 L. Donnie Smith <cwiid@abstrakraft.org>
 *  * renamed wiimote to libcwiid, renamed structures accordingly
 *
 *  2007-04-08 L. Donnie Smith <cwiid@abstrakraft.org>
 *  * fixed incompatible pointer warning in process_error
 *
 *  2007-04-08 Petter Reinholdtsen <pere@hungry.com>
 *  * fixed signed/unsigned comparison error in int_listen
 *
 *  2007-04-04 L. Donnie Smith <cwiid@abstrakraft.org>
 *  * implemented process_error to handle socket read errors
 *  * added rw_status triggers to read and write handlers
 *
 *  2007-03-14 L. Donnie Smith <cwiid@abstrakraft.org>
 *  * audit error checking
 *  * reorganized file
 *  * moved int_listen read/write code to process_read and process_write
 *  * updated (some/a few) comments
 *
 *  2007-03-06 L. Donnie Smith <cwiid@abstrakraft.org>
 *  * added wiimote parameter to cwiid_err calls
 *
 *  2007-03-01 L. Donnie Smith <cwiid@abstrakraft.org>
 *  * Initial ChangeLog
 *  * type audit (stdint, const, char booleans)
 */

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <time.h>
#include <unistd.h>
#include "cwiid_internal.h"

#define READ_BUF_LEN 23
void *router_thread(struct wiimote *wiimote)
{
	unsigned char buf[READ_BUF_LEN];
	ssize_t len;
	struct mesg_array ma;
	char err, print_clock_err = 1;

	while (1) {
		/* Read packet */
		len = read(wiimote->int_socket, buf, READ_BUF_LEN);
		ma.count = 0;
		if (clock_gettime(CLOCK_REALTIME, &ma.timestamp)) {
			if (print_clock_err) {
				cwiid_err(wiimote, "clock_gettime error");
				print_clock_err = 0;
			}
		}
		err = 0;
		if ((len == -1) || (len == 0)) {
			process_error(wiimote, len, &ma);
			write_mesg_array(wiimote, &ma);
			/* Quit! */
			break;
		}
		else {
			/* Verify first byte (DATA/INPUT) */
			if (buf[0] != (BT_TRANS_DATA | BT_PARAM_INPUT)) {
				cwiid_err(wiimote, "Invalid packet type");
			}

			/* Main switch */
			switch (buf[1]) {
			case RPT_STATUS:
				err = process_status(wiimote, &buf[2], &ma);
				break;
			case RPT_BTN:
				err = process_btn(wiimote, &buf[2], &ma);
				break;
			case RPT_BTN_ACC:
				err = process_btn(wiimote, &buf[2], &ma) ||
				      process_acc(wiimote, &buf[4], &ma);
				break;
			case RPT_BTN_EXT8:
				err = process_btn(wiimote, &buf[2], &ma) ||
				      process_ext(wiimote, &buf[4], 8, &ma);
				break;
			case RPT_BTN_ACC_IR12:
				err = process_btn(wiimote, &buf[2], &ma) ||
				      process_acc(wiimote, &buf[4], &ma) ||
				      process_ir12(wiimote, &buf[7], &ma);
				break;
			case RPT_BTN_EXT19:
				err = process_btn(wiimote, &buf[2], &ma) ||
				      process_ext(wiimote, &buf[4], 19, &ma);
				break;
			case RPT_BTN_ACC_EXT16:
				err = process_btn(wiimote, &buf[2], &ma) ||
				      process_acc(wiimote, &buf[4], &ma) ||
				      process_ext(wiimote, &buf[7], 16, &ma);
				break;
			case RPT_BTN_IR10_EXT9:
				err = process_btn(wiimote, &buf[2], &ma)  ||
				      process_ir10(wiimote, &buf[4], &ma) ||
				      process_ext(wiimote, &buf[14], 9, &ma);
				break;
			case RPT_BTN_ACC_IR10_EXT6:
				err = process_btn(wiimote, &buf[2], &ma)  ||
				      process_acc(wiimote, &buf[4], &ma)  ||
				      process_ir10(wiimote, &buf[7], &ma) ||
				      process_ext(wiimote, &buf[17], 6, &ma);
				break;
			case RPT_EXT21:
				err = process_ext(wiimote, &buf[2], 21, &ma);
				break;
			case RPT_BTN_ACC_IR36_1:
			case RPT_BTN_ACC_IR36_2:
				cwiid_err(wiimote, "Unsupported report type received "
				                   "(interleaved data)");
				err = 1;
				break;
			case RPT_READ_DATA:
				err = process_read(wiimote, &buf[4]) ||
				      process_btn(wiimote, &buf[2], &ma);
				break;
			case RPT_WRITE_ACK:
				err = process_write(wiimote, &buf[2]);
				break;
			default:
				cwiid_err(wiimote, "Unknown message type");
				err = 1;
				break;
			}

			if (!err && (ma.count > 0)) {
				if (update_state(wiimote, &ma)) {
					cwiid_err(wiimote, "State update error");
				}
				if (wiimote->flags & CWIID_FLAG_MESG_IFC) {
					/* prints its own errors */
					write_mesg_array(wiimote, &ma);
				}
			}
		}
	}

	return NULL;
}

void *status_thread(struct wiimote *wiimote)
{
	struct mesg_array ma;
	struct cwiid_status_mesg *status_mesg;
	unsigned char buf;

	ma.count = 1;
	status_mesg = &ma.array[0].status_mesg;

	while (1) {
		if (full_read(wiimote->status_pipe[0], status_mesg,
		              sizeof *status_mesg)) {
			cwiid_err(wiimote, "Pipe read error (status)");
			/* Quit! */
			break;
		}

		if (status_mesg->type != CWIID_MESG_STATUS) {
			cwiid_err(wiimote, "Bad message on status pipe");
			continue;
		}

		if (status_mesg->ext_type == CWIID_EXT_UNKNOWN) {
			if (wiimote->state.ext_type == CWIID_EXT_NONE) {
				buf = 0x00;
				/* Initialize extension register space */
				if (cwiid_write(wiimote, CWIID_RW_REG, 0xA40040, 1, &buf)) {
					cwiid_err(wiimote, "Extension initialization error");
					status_mesg->ext_type = CWIID_EXT_UNKNOWN;
				}
				/* Read extension ID */
				else if (cwiid_read(wiimote, CWIID_RW_REG | CWIID_RW_DECODE,
				                    0xA400FE, 1, &buf)) {
					cwiid_err(wiimote, "Read error (extension error)");
					status_mesg->ext_type = CWIID_EXT_UNKNOWN;
				}
				else {
					switch (buf) {
					case EXT_NONE:
					case EXT_PARTIAL:
						status_mesg->ext_type = CWIID_EXT_NONE;
						break;
					case EXT_NUNCHUK:
						status_mesg->ext_type = CWIID_EXT_NUNCHUK;
						break;
					case EXT_CLASSIC:
						status_mesg->ext_type = CWIID_EXT_CLASSIC;
						break;
					default:
						status_mesg->ext_type = CWIID_EXT_UNKNOWN;
						break;
					}
				}
			}
			else {
				status_mesg->ext_type = wiimote->state.ext_type;
			}
		}

		if (update_state(wiimote, &ma)) {
			cwiid_err(wiimote, "State update error");
		}
		if (update_rpt_mode(wiimote, -1)) {
			cwiid_err(wiimote, "Error reseting report mode");
		}
		if ((wiimote->state.rpt_mode & CWIID_RPT_STATUS) &&
		  (wiimote->flags & CWIID_FLAG_MESG_IFC)) {
			if (write_mesg_array(wiimote, &ma)) {
				/* prints its own errors */
			}
		}
	}

	return NULL;
}

void *mesg_callback_thread(struct wiimote *wiimote)
{
	int mesg_pipe = wiimote->mesg_pipe[0];
	cwiid_mesg_callback_t *callback = wiimote->mesg_callback;
	struct mesg_array ma;
	int cancelstate;

	while (1) {
		if (read_mesg_array(mesg_pipe, &ma)) {
			cwiid_err(wiimote, "Mesg pipe read error");
			continue;
		}

		/* TODO: The callback can still be called once after disconnect,
		 * although it's very unlikely.  User must keep track and avoid
		 * accessing the wiimote struct after disconnect. */
		if (pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancelstate)) {
			cwiid_err(wiimote, "Cancel state disable error (callback thread)");
		}
		callback(wiimote, ma.count, ma.array, &ma.timestamp);
		if (pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &cancelstate)) {
			cwiid_err(wiimote, "Cancel state restore error (callback thread)");
		}
	}

	return NULL;
}