class OpenTelemetryTraceContext:
    traceparent_tpl = "xx-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx-xxxxxxxxxxxxxxxx-xx"
    translation = str.maketrans("1234567890abcdef", "xxxxxxxxxxxxxxxx")

    def __init__(self, traceparent, tracestate):
        # xx-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx-xxxxxxxxxxxxxxxx-xx
        # ^              ^                           ^         ^
        # version     trace_id                    span_id      flags

        self.trace_id = None  # UUID
        self.span_id = None  # UInt64
        self.tracestate = tracestate  # String
        self.trace_flags = None  # UInt8

        if traceparent is not None:
            self.parse_traceparent(traceparent)

        super().__init__()

    def parse_traceparent(self, traceparent):
        traceparent = traceparent.lower()

        if len(traceparent) != len(self.traceparent_tpl):
            raise ValueError(
                "unexpected length {}, expected {}".format(
                    len(traceparent), len(self.traceparent_tpl)
                )
            )

        if traceparent.translate(self.translation) != self.traceparent_tpl:
            raise ValueError(f"Malformed traceparant header: {traceparent}")

        parts = traceparent.split("-")
        version = int(parts[0], 16)
        if version != 0:
            raise ValueError(f"unexpected version {parts[0]}, expected 00")

        self.trace_id = (int(parts[1][16:], 16) << 64) + int(parts[1][:16], 16)
        self.span_id = int(parts[2], 16)
        self.trace_flags = int(parts[3], 16)