package xinput_devnodes

// #cgo CFLAGS: -g --std=gnu99 -pedantic -Wall
// #cgo LDFLAGS: -lX11 -lXi 
// #include "devnodes.h"
// #include <stdlib.h>
// #include <string.h>
import "C"
import (
	"fmt"
	"unsafe"
	"regexp"
)


func FindKeyboardDevNode() string {
	xslaveinfos, freeMethod := GetXSlaveInfo()
	defer freeMethod()

	re := regexp.MustCompile(`(?i).*keyboard.*`)
	for _, xslaveinfo := range xslaveinfos {
		name, devNode := C.GoString(xslaveinfo.name), C.GoString(xslaveinfo.dev_node)
		if re.MatchString(name) {
			return devNode
		}
	}
	return ""
}


func Print() {
	xslaveinfos, freeMethod := GetXSlaveInfo()
	defer freeMethod()

	for _, xslaveinfo := range xslaveinfos {
		fmt.Printf("%s = %s\n", C.GoString(xslaveinfo.name), C.GoString(xslaveinfo.dev_node))
	}
}


func GetXSlaveInfo() ([]C.XSlaveInfo, func()) {
	xslaves := C.get_slave_info()
	arr := (*[1 << 30]C.XSlaveInfo)(unsafe.Pointer(xslaves.slaves))
	slice := arr[:xslaves.length:xslaves.length]
	freeMethod := func() {
		C.free_xslaves(xslaves)
	}

	return slice, freeMethod
}