import ctypes
from pymsc.lib1553.messages.tracked_target import TrackedTarget01


class MsgB5Payload(ctypes.Structure):
    """Message B5: Tracked Target Message.

    This message uses the `TrackedTarget01` layout for the first target block.
    Remaining words (if any) are kept as uint16 placeholders to reach 32 words.
    """
    _pack_ = 1
    _fields_ = [
        ("tracked_target_01", TrackedTarget01),
    ] + [(f"word_{i:02d}", ctypes.c_uint16) for i in range(1, 33)]

    def __init__(self):
        super().__init__()