"""Native graph builder lives in periscope/src; via≠pad stays on the KiCad PCB parser."""

from __future__ import annotations

from pathlib import Path

import backend.periscopex.graph as graph
from backend.periscopex.graph import _classify_component, _infer_net_properties
from backend.periscopex.models import ComponentType, NetType
from backend.periscopex.parsers_kicad_pcb import LayoutPad, LayoutVia


def test_graph_module_is_src_rewrite():
    path = Path(graph.__file__).resolve()
    assert path.parts[-5:] == ("periscope", "src", "backend", "periscopex", "graph.py")
    text = path.read_text(encoding="utf-8")
    assert "Native Periscope overlay" not in text
    assert "original Periscope orchestration" in text


def test_classify_prefixes_and_unknown():
    assert _classify_component("FB1", "") == ComponentType.INDUCTOR
    assert _classify_component("RN4", "") == ComponentType.RESISTOR
    assert _classify_component("F1", "") == ComponentType.FUSE
    assert _classify_component("R10", "") == ComponentType.RESISTOR
    assert _classify_component("9", "") == ComponentType.UNKNOWN
    assert _classify_component("9", "CONN_HEADER") == ComponentType.CONNECTOR


def test_infer_ground_power_signal():
    assert _infer_net_properties("GND") == (NetType.GROUND, 0.0)
    assert _infer_net_properties("AGND") == (NetType.GROUND, 0.0)
    ntype, volts = _infer_net_properties("+3V3")
    assert ntype == NetType.POWER
    assert volts == 3.3
    ntype, volts = _infer_net_properties("3V3_DIGITAL")
    assert ntype == NetType.POWER
    assert volts == 3.3
    ntype, volts = _infer_net_properties("I2C1_SCL")
    assert ntype == NetType.SIGNAL
    assert volts is None


def test_via_is_not_pad():
    via = LayoutVia(x=0.0, y=0.0, net="GND", drill=0.3)
    pad = LayoutPad(number="1", x=0.0, y=0.0, net="GND")
    assert type(via) is not type(pad)
    assert not hasattr(via, "number")
    assert pad.number == "1"
    assert via.net == "GND"