from .Messages import IMessage

class NameMsg(IMessage):
    id = 0x91
    length = 4

    thing_id = None
    name = None

    def __init__(self, data, thing = None):
        if isinstance(data, bytes):
            self.network_id = data[1]
            self.thing_id = data[2]
            # name_length is not needed here
            self.name = data[NameMsg.length:].decode("utf-8")
        else:
            self.network_id = data
            if thing is not None:
                self.thing_id = thing.id
                self.name = thing.name

    def Serialize(self, buffer_ref):
        if self.network_id is None or self.thing_id is None or self.name is None:
            return 0

        buffer: bytearray = buffer_ref[0]

        encoded_name = self.name.encode('utf-8')
        name_length = len(encoded_name)
        full_length = NameMsg.length + name_length
        if name_length == 0 or full_length > len(buffer):
            return 0
        
        buffer[0:NameMsg.length] = [
            NameMsg.id,
            self.network_id,
            self.thing_id,
            name_length
        ]
        # Append the name string
        buffer[NameMsg.length:full_length] = encoded_name
        return full_length