from __future__ import annotations

import json
from pathlib import Path

import pytest


@pytest.mark.signalsim
def test_four_satellites_are_navigation_ready_without_truth_inputs() -> None:
    path = Path("reports/navigation_run/inav_collection_report.json")
    if not path.is_file():
        pytest.skip("SignalSim multi-satellite navigation collection report is unavailable")
    report = json.loads(path.read_text(encoding="utf-8"))
    assert report["decoder_truth_inputs"] == []
    ready = [
        item for item in report["satellites"].values()
        if item["complete_ephemeris"] and item["clock_parameters"] and item["health_valid"] and item["data_valid"]
    ]
    assert len(ready) >= 4
    assert report["galileo_time"]["valid"] is True
    assert report["navigation_ready"] is True