#ifndef _JOYSTICK_H_
#define _JOYSTICK_H_

#include <Arduino.h>
#include <stdint.h>

#define BUTTON_STABLETIME    100
#define JOYSTICK_STABLETIME  3000

// Button states
#define BUTTON_STATE_BOUNCING     (1 << 0)
#define BUTTON_STATE_DOWN         (1 << 1)
#define BUTTON_STATE_UP           (1 << 2)
#define BUTTON_STATE_HELD         (1 << 3)

// Joystick states
#define JOYSTICK_STATE_CALIBRATING (1 << 0)
#define JOYSTICK_STATE_CALIBRATED  (1 << 1)
#define JOYSTICK_STATE_READING     (1 << 2)
#define JOYSTICK_STATE_READY       (1 << 3)

typedef struct Calibration {
	// When did calibration start
	uint32_t start_time;
	// Low calibration range
	uint32_t low;
	// High calibration range
	uint32_t high;
	// How long we should sample values on this joystick
	uint32_t stable_time;
} Calibration;

typedef struct Button {
	// What pin is this button on
	uint8_t pin;
	// What is the state of this button (bitmask of BUTTON_STATE_*)
	uint8_t state;
	// Is this button pressed when it is LOW or HIGH?
	uint32_t pressedvalue;
	// How long do we wait when debouncing this button
	uint32_t debouncetime;
	// When did we start debouncing
	uint32_t debounce_start_time;
} Button;

typedef struct JoystickAxis {
	// What ADC pin is this joystick axis connected to
	uint8_t pin;
	// Calibration data
	Calibration calibration;
	// Position as of the last read time.
	uint32_t position;
} JoystickAxis;

typedef struct Joystick {
	// X axis data
	JoystickAxis x;
	// Y axis data
	JoystickAxis y;
	// This is the Z axis switch on the joystick control
	Button button;
	// What is the state of this joystick (bitmask of JOYSTICK_STATE_*)
	uint8_t state;
} Joystick;

int initJoystick(Joystick *js, uint8_t pin_x, uint8_t pin_y, uint8_t pin_z);
int initButton(Button *button);
int calibrateJoystick(Joystick *js);
int readButton(Button *button);
int readJoystick(Joystick *js);

#endif // _JOYSTICK_H_