#ifndef M_JOY_H
#define M_JOY_H

#include "c_cvars.h"
#include "keydef.h"
#include "tarray.h"

union CubicBezier {
	struct {
		float x1;
		float y1;
		float x2;
		float y2;
	};
	float pts[4];
};

enum EJoyCurve {
	JOYCURVE_CUSTOM = -1,
	JOYCURVE_DEFAULT,
	JOYCURVE_LINEAR,
	JOYCURVE_QUADRATIC,
	JOYCURVE_CUBIC,

	NUM_JOYCURVE
};

extern const float JOYDEADZONE_DEFAULT;

extern const float JOYSENSITIVITY_DEFAULT;

extern const float JOYHAPSTRENGTH_DEFAULT;

extern const float JOYTHRESH_DEFAULT;

extern const float JOYTHRESH_TRIGGER;
extern const float JOYTHRESH_STICK_X;
extern const float JOYTHRESH_STICK_Y;

extern const CubicBezier JOYCURVE[NUM_JOYCURVE];

// Generic configuration interface for a controller.
struct IJoystickConfig
{
	virtual ~IJoystickConfig() = 0;

	virtual FString GetName() = 0;
	virtual float GetSensitivity() = 0;
	virtual void SetSensitivity(float scale) = 0;

	virtual bool HasHaptics() = 0;
	virtual float GetHapticsStrength() = 0;
	virtual void SetHapticsStrength(float strength) = 0;

	virtual int GetNumAxes() = 0;
	virtual float GetAxisDeadZone(int axis) = 0;
	virtual const char *GetAxisName(int axis) = 0;
	virtual float GetAxisScale(int axis) = 0;
	virtual float GetAxisDigitalThreshold(int axis) = 0;
	virtual EJoyCurve GetAxisResponseCurve(int axis) = 0;
	virtual float GetAxisResponseCurvePoint(int axis, int point) = 0;

	virtual void SetAxisDeadZone(int axis, float zone) = 0;
	virtual void SetAxisScale(int axis, float scale) = 0;
	virtual void SetAxisDigitalThreshold(int axis, float threshold) = 0;
	virtual void SetAxisResponseCurve(int axis, EJoyCurve preset) = 0;
	virtual void SetAxisResponseCurvePoint(int axis, int point, float value) = 0;

	virtual bool GetEnabled() = 0;
	virtual void SetEnabled(bool enabled) = 0;

	virtual bool AllowsEnabledInBackground() = 0;
	virtual bool GetEnabledInBackground() = 0;
	virtual void SetEnabledInBackground(bool enabled) = 0;

	// Used by the saver to not save properties that are at their defaults.
	virtual bool IsSensitivityDefault() = 0;
	virtual bool IsHapticsStrengthDefault() = 0;
	virtual bool IsAxisDeadZoneDefault(int axis) = 0;
	virtual bool IsAxisScaleDefault(int axis) = 0;
	virtual bool IsAxisDigitalThresholdDefault(int axis) = 0;
	virtual bool IsAxisResponseCurveDefault(int axis) = 0;

	virtual void SetDefaultConfig() = 0;
	virtual FString GetIdentifier() = 0;

	void Reset()
	{
		SetDefaultConfig();
		SetEnabled(true);
		SetEnabledInBackground(AllowsEnabledInBackground());
		SetSensitivity(1);
	}
};

EXTERN_CVAR(Bool, use_joystick);

bool M_LoadJoystickConfig(IJoystickConfig *joy);
void M_SaveJoystickConfig(IJoystickConfig *joy);

void Joy_GenerateButtonEvent(bool down, EKeyCodes which);
void Joy_GenerateButtonEvents(int oldbuttons, int newbuttons, int numbuttons, int base);
void Joy_GenerateButtonEvents(int oldbuttons, int newbuttons, int numbuttons, const int *keys);

double Joy_ApplyResponseCurveBezier(const CubicBezier &curve, double input);
double Joy_ManageSingleAxis(double axisval, double deadzone, double threshold, const CubicBezier &curve, uint8_t *buttons);
int Joy_XYAxesToButtons(double x, double y);
double Joy_ManageThumbstick(double *axis_x, double *axis_y, double deadzone_x, double deadzone_y,
	double threshold_x, double threshold_y, const CubicBezier &curve_x, const CubicBezier &curve_y, uint8_t *buttons);


// These ought to be provided by a system-specific i_input.cpp.
void I_GetAxes(float axes[NUM_AXIS_CODES]);
void I_GetJoysticks(TArray<IJoystickConfig *> &sticks);
IJoystickConfig *I_UpdateDeviceList();
extern void UpdateJoystickMenu(IJoystickConfig *);

#endif