import os, sys
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
import pos_briefing as pb


def test_cache_hit_returns_cached_ip(monkeypatch, tmp_path):
    cache = tmp_path / "last_ip"
    cache.write_text("192.168.0.50")
    monkeypatch.setattr(pb, "CACHE_FILE", cache)
    monkeypatch.setattr(pb, "PRINTER_MAC", "50:57:9c:eb:0f:07")
    monkeypatch.setattr(pb, "_mac_of", lambda ip: "50:57:9c:eb:0f:07" if ip == "192.168.0.50" else None)
    monkeypatch.setattr(pb, "_port_open", lambda ip, port, timeout=3: True)
    assert pb.discover_printer() == "192.168.0.50"


def test_sweep_finds_printer_on_cache_miss(monkeypatch, tmp_path):
    cache = tmp_path / "last_ip"
    monkeypatch.setattr(pb, "CACHE_FILE", cache)
    monkeypatch.setattr(pb, "PRINTER_IP", "192.168.0.99")  # stale seed
    monkeypatch.setattr(pb, "PRINTER_MAC", "50:57:9c:eb:0f:07")
    monkeypatch.setattr(pb, "PRINTER_SUBNET", "192.168.0")
    monkeypatch.setattr(pb, "_mac_of", lambda ip: None)  # seed/cache miss
    monkeypatch.setattr(pb, "_sweep_arp", lambda: {"50:57:9c:eb:0f:07": "192.168.0.184"})
    monkeypatch.setattr(pb, "_port_open", lambda ip, port, timeout=3: True)
    assert pb.discover_printer() == "192.168.0.184"
    assert cache.read_text().strip() == "192.168.0.184"


def test_not_found_raises(monkeypatch, tmp_path):
    monkeypatch.setattr(pb, "CACHE_FILE", tmp_path / "last_ip")
    monkeypatch.setattr(pb, "PRINTER_IP", "")
    monkeypatch.setattr(pb, "PRINTER_MAC", "50:57:9c:eb:0f:07")
    monkeypatch.setattr(pb, "_mac_of", lambda ip: None)
    monkeypatch.setattr(pb, "_sweep_arp", lambda: {})
    try:
        pb.discover_printer()
        assert False, "expected RuntimeError"
    except RuntimeError as e:
        assert "printer-not-found" in str(e)