package inputs

import (
	"encoding/binary"
	"fmt"
	"os"
	"time"
)

type JoystickEvent struct {
	Time   uint32 // Event timestamp in milliseconds
	Value  int16  // Value of the event (button press or axis movement)
	Type   uint8  // Event type (button or axis)
	Number uint8  // Axis/button number
}

const (
	JS_EVENT_BUTTON = 0x01 // Button pressed/released
	JS_EVENT_AXIS   = 0x02 // Joystick moved
	JS_EVENT_INIT   = 0x80 // Initial state of device
)

func Start() {
	// Open the joystick device file
	file, err := os.Open("/dev/input/js0")
	if err != nil {
		fmt.Println("Error opening joystick:", err)
		return
	}
	defer file.Close()

	// Continuously read joystick events
	for {
		var e JoystickEvent
		err := binary.Read(file, binary.LittleEndian, &e)
		if err != nil {
			fmt.Println("Error reading joystick event:", err)
			return
		}

		// Handle the event
		handleJoystickEvent(e)

		// Sleep to avoid flooding output
		time.Sleep(10 * time.Millisecond)
	}
}

// handleJoystickEvent processes joystick events.
func handleJoystickEvent(e JoystickEvent) {
	if e.Type&JS_EVENT_INIT != 0 {
		// Ignore initial state events
		return
	}

	if e.Type&JS_EVENT_BUTTON != 0 {
		if e.Value == 1 {
			fmt.Printf("Button %d pressed\n", e.Number)
		} else {
			fmt.Printf("Button %d released\n", e.Number)
		}
	}

	if e.Type&JS_EVENT_AXIS != 0 {
		fmt.Printf("Axis %d moved to %d\n", e.Number, e.Value)
	}
}