import json

from v1.report import collect_jsonl, format_report, load_events, summarize


def _write_events(path, events):
    path.write_text(
        "\n".join(json.dumps(e, ensure_ascii=False) for e in events) + "\n",
        encoding="utf-8",
    )


def _event(event_id, latency):
    return {
        "event_id": event_id,
        "track_id": "P-0001",
        "confirmed_at_utc": "2026-07-21T08:30:00+00:00",
        "latency_seconds": latency,
        "screenshot": "20260721/{0}.png".format(event_id),
    }


def test_load_events_reads_each_jsonl_line(tmp_path):
    jsonl = tmp_path / "events.jsonl"
    _write_events(jsonl, [_event("FALL-A-000001", 1.8), _event("FALL-A-000002", 2.1)])

    events = load_events(jsonl)

    assert len(events) == 2
    assert events[0]["event_id"] == "FALL-A-000001"


def test_summarize_counts_latency_in_target_window(tmp_path):
    events = [_event("a", 1.8), _event("b", 0.9), _event("c", 3.0)]

    summary = summarize(events)

    assert summary["count"] == 3
    assert summary["latency_in_target"] == 2  # 1.8 and 3.0 are within 1-3s, 0.9 is not


def test_empty_log_reads_as_clean_pass(tmp_path):
    jsonl = tmp_path / "events.jsonl"
    jsonl.write_text("", encoding="utf-8")

    events = load_events(jsonl)
    report = format_report(jsonl, events)

    assert events == []
    assert "no confirmed events" in report


def test_collect_jsonl_finds_day_directories(tmp_path):
    day = tmp_path / "20260721"
    day.mkdir()
    _write_events(day / "events.jsonl", [_event("FALL-A-000001", 1.8)])

    found = collect_jsonl(tmp_path)

    assert found == [day / "events.jsonl"]