extends RefCounted
class_name Guid

var bytes: PackedByteArray

static func new_guid() -> Guid:
	var guid = Guid.new()
	guid.bytes = _generate_random_bytes(16)
	# Set UUID version (4) and variant bits
	guid.bytes[6] = (guid.bytes[6] & 0x0F) | 0x40
	guid.bytes[8] = (guid.bytes[8] & 0x3F) | 0x80
	return guid

static func from_string(input: String) -> Guid:
	var clean = input.replace("-", "")
	if clean.length() != 32:
		push_error("Invalid GUID string format")
		return null
	var guid = Guid.new()
	guid.bytes = PackedByteArray()
	for i in range(0, 32, 2):
		guid.bytes.append(clean.substr(i, 2).hex_to_int())
	return guid

func _to_string() -> String:
	var hex = ""
	for b in bytes:
		hex += "%02x" % b
	return (
		hex.substr(0,8) + "-" +
		hex.substr(8,4) + "-" +
		hex.substr(12,4) + "-" +
		hex.substr(16,4) + "-" +
		hex.substr(20,12)
	)

func to_base64() -> String:
	return Marshalls.raw_to_base64(bytes)

# --- internal ---
static func _generate_random_bytes(length: int) -> PackedByteArray:
	var arr = PackedByteArray()
	for i in range(length):
		arr.append(randi() & 0xFF)
	return arr