// Copyright 2005-2016 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.

#ifndef MUMBLE_MUMBLE_XBOXINPUT_H_
#define MUMBLE_MUMBLE_XBOXINPUT_H_

#include <windows.h>
#include <stdint.h>
#include <QUuid>

/// XBOXINPUT_MAX_DEVICES defines the maximum
/// number of devices that can be connected
/// to the system at once.
///
/// In typical operation, one calls GetState()
/// in a loop bounded by XBOXINPUT_MAX_DEVICES.
#define XBOXINPUT_MAX_DEVICES        4

/// XBOXINPUT_TRIGGER_THRESHOLD defines the thresold
/// that an analog trigger (leftTrigger and
/// rightTrigger of XboxInputState) must have exceeded
/// in order to count as a button press.
#define XBOXINPUT_TRIGGER_THRESHOLD  30

/// XboxInputState represents the state of an
/// Xbox controller as returned by GetState().
struct XboxInputState {
	uint32_t  packetNumber;
	uint16_t  buttons;
	uint8_t   leftTrigger;
	uint8_t   rightTrigger;
	uint16_t  leftThumbX;
	uint16_t  leftThumbY;
	uint16_t  rightThumbY;
	uint16_t  rightThumbX;
	uint32_t  paddingReserved; // Required for XInputGetStateEx. Not required for XInputGetState. 
};

/// XboxInput is an XInput wrapper that dynamically loads an appropriate
/// xinput*.dll on construction and provides access to its GetState(Ex)
/// function.
class XboxInput {
	public:
		XboxInput();
		virtual ~XboxInput();

		/// s_XboxInputGuid is the GUID used by GlobalShortcut_win
		/// to distinguish XboxInputLibrary's events from other event
		/// soures.
		static const QUuid s_XboxInputGuid;

		/// isValid determines wheter the XboxInputLibrary
		/// is usable.
		bool isValid() const;

		/// Query the state of the Xbox controller at deviceIndex.
		/// If the function succeeds, it returns 0 (Windows's ERROR_SUCCESS).
		/// If no device is connected, it returns 0x48F (Windows's ERROR_DEVICE_NOT_CONNECTED).
		uint32_t (WINAPI *GetState)(uint32_t deviceIndex, XboxInputState *state);

	protected:
		/// m_getStateFunc represents XInputGetState from the XInput DLL.
		uint32_t (WINAPI *m_getStateFunc)(uint32_t deviceIndex, XboxInputState *state);

		/// m_getStateFuncEx represents XInputGetStateEx, which is optionally
		/// available in the XInput DLL.
		uint32_t (WINAPI *m_getStateExFunc)(uint32_t deviceIndex, XboxInputState *state);

		/// m_xinputlib is the handle to the XInput DLL as returned by
		/// LoadLibrary.
		HMODULE m_xinputlib;

		/// m_valid determines whether or not the XboxInputLibrary
		/// is valid for use.
		bool m_valid;
};

#endif
