"""Validate the declared Board2 Hub/USB topology before routing."""
import json
from pathlib import Path
import pcbnew

ROOT = Path(__file__).resolve().parents[1]
BOARD_PATH = ROOT / "PhoneRail-Board2" / "PhoneRail-Board2.kicad_pcb"
TOPOLOGY = ROOT / "pcb2-usb-topology.json"

def main():
    board = pcbnew.LoadBoard(str(BOARD_PATH))
    topo = json.loads(TOPOLOGY.read_text(encoding="utf-8"))
    refs = {f.GetReference(): f for f in board.GetFootprints()}
    required = ["J23", "U32", "J31", "J32"]
    missing = [r for r in required if r not in refs]
    assert not missing, f"missing required footprints: {missing}"
    report = {"status": "PASS", "required": required, "missing": missing,
              "tracks": len(board.GetTracks()), "nets": {}}
    for ref in required:
        nets = sorted({p.GetNetname() for p in refs[ref].Pads() if p.GetNetCode() > 0})
        report["nets"][ref] = nets
    assert report["nets"]["J23"], "J23 has no assigned nets"
    assert report["nets"]["U32"], "U32 has no assigned nets"
    out = ROOT / "out" / "pcb2-topology"
    out.mkdir(parents=True, exist_ok=True)
    (out / "verification.json").write_text(json.dumps(report, indent=2) + "\n", encoding="utf-8")
    print(json.dumps(report, indent=2))

if __name__ == "__main__":
    main()