/*
 *	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 Windows.
 */

#ifdef WIN32

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

#include <windows.h>
#include <hidsdi.h>
#include <setupapi.h>

#include "definitions.h"
#include "wiiuse_internal.h"
#include "io.h"


int wiiuse_find(struct wiimote_t** wm, int max_wiimotes, int timeout) {
	GUID device_id;
	HANDLE dev;
	HDEVINFO device_info;
	int i, index;
	DWORD len;
	SP_DEVICE_INTERFACE_DATA device_data;
	PSP_DEVICE_INTERFACE_DETAIL_DATA detail_data = NULL;
	HIDD_ATTRIBUTES	attr;
	int found = 0;

	(void) timeout; // unused

	device_data.cbSize = sizeof(device_data);
	index = 0;

	/* get the device id */
	HidD_GetHidGuid(&device_id);

	/* get all hid devices connected */
	device_info = SetupDiGetClassDevs(&device_id, NULL, NULL, (DIGCF_DEVICEINTERFACE | DIGCF_PRESENT));

	for (;; ++index) {

		if (detail_data) {
			free(detail_data);
			detail_data = NULL;
		}

		/* query the next hid device info */
		if (!SetupDiEnumDeviceInterfaces(device_info, NULL, &device_id, index, &device_data))
			break;

		/* get the size of the data block required */
		i = SetupDiGetDeviceInterfaceDetail(device_info, &device_data, NULL, 0, &len, NULL);
		detail_data = malloc(len);
		detail_data->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);

		/* query the data for this device */
		if (!SetupDiGetDeviceInterfaceDetail(device_info, &device_data, detail_data, len, NULL, NULL))
			continue;

		/* open the device */
		dev = CreateFile(detail_data->DevicePath,
						(GENERIC_READ | GENERIC_WRITE),
						(FILE_SHARE_READ | FILE_SHARE_WRITE),
						NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
		if (dev == INVALID_HANDLE_VALUE)
			continue;

		/* get device attributes */
		attr.Size = sizeof(attr);
		i = HidD_GetAttributes(dev, &attr);

		if ((attr.VendorID == WM_VENDOR_ID) && (attr.ProductID == WM_PRODUCT_ID)) {
			/* this is a wiimote */
			wm[found]->dev_handle = dev;

			wm[found]->hid_overlap.hEvent = CreateEvent(NULL, 1, 1, L"");
			wm[found]->hid_overlap.Offset = 0;
			wm[found]->hid_overlap.OffsetHigh = 0;

			WIIMOTE_ENABLE_STATE(wm[found], WIIMOTE_STATE_DEV_FOUND);
			WIIMOTE_ENABLE_STATE(wm[found], WIIMOTE_STATE_CONNECTED);

			/* try to set the output report to see if the device is actually connected */
			if (!wiiuse_set_report_type(wm[found])) {
				WIIMOTE_DISABLE_STATE(wm[found], WIIMOTE_STATE_CONNECTED);
				continue;
			}

			/* do the handshake */
			wiiuse_handshake(wm[found], NULL, 0);

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

			++found;
			if (found >= max_wiimotes)
				break;
		} else {
			/* not a wiimote */
			CloseHandle(dev);
		}
	}

	if (detail_data)
		free(detail_data);

	SetupDiDestroyDeviceInfoList(device_info);

	return found;
}


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_CONNECTED))
			++connected;
	}

	return connected;
}


void wiiuse_disconnect(struct wiimote_t* wm) {
	if (!wm || WIIMOTE_IS_CONNECTED(wm))
		return;

	CloseHandle(wm->dev_handle);
	wm->dev_handle = 0;

	ResetEvent(&wm->hid_overlap);

	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) {
	DWORD b, r;

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

	if (!ReadFile(wm->dev_handle, wm->event_buf, sizeof(wm->event_buf), &b, &wm->hid_overlap)) {
		/* partial read */
		b = GetLastError();

		if ((b == ERROR_HANDLE_EOF) || (b == ERROR_DEVICE_NOT_CONNECTED)) {
			/* remote disconnect */
			wiiuse_disconnected(wm);
			return 0;
		}

		r = WaitForSingleObject(wm->hid_overlap.hEvent, wm->timeout);
		if (r == WAIT_TIMEOUT) {
			/* timeout - cancel and continue */

			if (*wm->event_buf)
				WIIUSE_WARNING("Packet ignored.  This may indicate a problem (timeout is %i ms).", wm->timeout);

			CancelIo(wm->dev_handle);
			ResetEvent(wm->hid_overlap.hEvent);
			return 0;
		} else if (r == WAIT_FAILED) {
			WIIUSE_WARNING("A wait error occured on reading from wiimote %i.", wm->unid);
			return 0;
		}

		if (!GetOverlappedResult(wm->dev_handle, &wm->hid_overlap, &b, 0))
			return 0;
	}

	// This needs to be done even if ReadFile fails, essential during init
	// Move the data over one, so we can add back in data report indicator byte (here, 0xa1)
	memmove(wm->event_buf + 1, wm->event_buf, sizeof(wm->event_buf) - 1);
	wm->event_buf[0] = 0xa1;

	ResetEvent(wm->hid_overlap.hEvent);
	return 1;
}


int wiiuse_io_write(struct wiimote_t* wm, byte* buf, int len) {
	DWORD bytes;
	int i;

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

	switch (wm->stack) {
		case WIIUSE_STACK_UNKNOWN:
		{
			/* try to auto-detect the stack type */
			if (i = WriteFile(wm->dev_handle, buf + 1, 22, &bytes, &wm->hid_overlap)) {
				/* bluesoleil will always return 1 here, even if it's not connected */
				wm->stack = WIIUSE_STACK_BLUESOLEIL;
				return i;
			}

			if (i = HidD_SetOutputReport(wm->dev_handle, buf + 1, len - 1)) {
				wm->stack = WIIUSE_STACK_MS;
				return i;
			}

			WIIUSE_ERROR("Unable to determine bluetooth stack type.");
			return 0;
		}

		case WIIUSE_STACK_MS:
			return HidD_SetOutputReport(wm->dev_handle, buf + 1, len - 1);

		case WIIUSE_STACK_BLUESOLEIL:
			return WriteFile(wm->dev_handle, buf + 1, 22, &bytes, &wm->hid_overlap);
	}

	return 0;
}

#endif /* ifdef WIN32 */