import os
import tempfile
import ctypes
import datetime

from target_simulator.gui.sfp_debug_window import DebugPayloadRouter
from target_simulator.core.sfp_structures import SFPHeader


def make_fake_packet(flow=ord("M"), tid=1):
    # construct a minimal header
    h = SFPHeader()
    h.SFP_FLOW = flow
    h.SFP_TID = tid
    return ctypes.string_at(ctypes.addressof(h), ctypes.sizeof(h))


def test_history_and_persist_toggle(tmp_path):
    router = DebugPayloadRouter()
    # set persist dir to tmp
    router._persist_dir = str(tmp_path)
    router.set_persist(True)
    # add one packet
    pkt = make_fake_packet()
    router.update_raw_packet(pkt, ("::1", 1234))
    hist = router.get_history()
    assert len(hist) == 1
    # persisted file created
    files = list(tmp_path.iterdir())
    assert files, "No persisted files created"

    # clear and check
    router.clear_history()
    assert router.get_history() == []


def test_get_and_clear_latest_payloads_and_raw_packet():
    router = DebugPayloadRouter()
    router._update_last_payload("MFD", bytearray(b"DATA1"))
    payloads = router.get_and_clear_latest_payloads()
    assert payloads.get("MFD") == bytearray(b"DATA1")

    # raw packet stored and cleared
    pkt = make_fake_packet(flow=ord("J"), tid=9)
    router.update_raw_packet(pkt, ("1.1.1.1", 5000))
    last = router.get_and_clear_raw_packet()
    assert last is not None
    assert last[1] == ("1.1.1.1", 5000)
    # next call returns None
    assert router.get_and_clear_raw_packet() is None