import importlib.util
import os

_SPEC = importlib.util.spec_from_file_location(
    "friction_scan",
    os.path.join(os.path.dirname(__file__), "..", "scripts", "friction-scan.py"),
)
fs = importlib.util.module_from_spec(_SPEC)
_SPEC.loader.exec_module(fs)

SAMPLE = """# FRICTION.md

## Open signals

_(append new raw signals here)_

- `[gotcha]` **First thing** (2026-06-01): body line one.
  continuation line two.
- `[friction]` **Second thing** (2026-06-10): only one line.

---

## Kaizen reviews — decisions ledger

- `[gotcha]` **Should not be parsed** (2026-01-01): in the ledger.
"""


def test_extract_open_section_stops_at_next_heading():
    section = fs.extract_open_section(SAMPLE)
    assert "First thing" in section
    assert "Second thing" in section
    assert "Should not be parsed" not in section


def test_split_signals_finds_two_items_and_joins_continuations():
    signals = fs.split_signals(fs.extract_open_section(SAMPLE))
    assert len(signals) == 2
    assert "continuation line two" in signals[0]
    assert signals[1].startswith("`[friction]`")


import datetime

TODAY = datetime.date(2026, 6, 15)


def test_parse_signal_extracts_tag_and_date_and_age():
    raw = fs.split_signals(fs.extract_open_section(SAMPLE))[0]
    sig = fs.parse_signal(raw, TODAY)
    assert sig["tag"] == "gotcha"
    assert sig["first_seen"] == "2026-06-01"
    assert sig["age_days"] == 14
    assert "First thing" in sig["text"]


def test_parse_signal_handles_missing_date():
    sig = fs.parse_signal("`[unused]` **No date here** something", TODAY)
    assert sig["tag"] == "unused"
    assert sig["first_seen"] is None
    assert sig["age_days"] is None


def test_recurrence_from_ordinal():
    assert fs.parse_recurrence("blah 5th occurrence (06-05/06/06) blah") == 5


def test_recurrence_from_datelist_when_no_ordinal():
    # three slash-separated date fragments -> recurrence 3
    assert fs.parse_recurrence("recurred (06-05/06-09/06-10) again") == 3


def test_recurrence_defaults_to_one():
    assert fs.parse_recurrence("a one-off gotcha") == 1


def test_parse_paths_picks_repo_paths_only():
    paths = fs.parse_paths("see `scripts/repo-scan.py` and `latest` and `foo.yml`")
    assert "scripts/repo-scan.py" in paths
    assert "foo.yml" in paths
    assert "latest" not in paths


def test_still_exists_false_for_missing_path():
    sig = fs.parse_signal("`[unused]` **x** (2026-06-01): `scripts/nope-not-real.py`", TODAY)
    assert sig["still_exists"] is False


def test_still_exists_true_for_real_path():
    sig = fs.parse_signal("`[gotcha]` **x** (2026-06-01): `scripts/repo-scan.py`", TODAY)
    assert sig["still_exists"] is True


def test_nudge_line_overdue_on_recurrence():
    sigs = [{"age_days": 2, "recurrence_count": 5}]
    line = fs.nudge_line(sigs)
    assert "OVERDUE" in line
    assert "max recurrence 5x" in line


def test_nudge_line_ok_when_quiet():
    sigs = [{"age_days": 3, "recurrence_count": 1}, {"age_days": 1, "recurrence_count": 1}]
    line = fs.nudge_line(sigs)
    assert "ok" in line
    assert "OVERDUE" not in line


def test_nudge_line_overdue_on_count():
    sigs = [{"age_days": 1, "recurrence_count": 1} for _ in range(8)]
    assert "OVERDUE" in fs.nudge_line(sigs)


def test_still_exists_ignores_non_repo_tokens():
    sig = fs.parse_signal("`[gotcha]` **x** (2026-06-01): `caddy-dns/gandi` and `make tf-init/plan`", TODAY)
    assert sig["still_exists"] is True


def test_nudge_line_overdue_on_age():
    sigs = [{"age_days": 21, "recurrence_count": 1}]
    assert "OVERDUE" in fs.nudge_line(sigs)


def test_load_signals_reads_real_friction_file():
    path = os.path.join(os.path.dirname(__file__), "..", "docs", "FRICTION.md")
    sigs = fs.load_signals(path, TODAY)
    # May legitimately be empty right after a /kaizen pass consumes every open signal —
    # an empty Open-signals section is the goal state, not a failure. Assert the function
    # parses the real file into well-formed signals (validity holds vacuously when empty).
    assert isinstance(sigs, list)
    assert all(s["tag"] in {"friction", "gotcha", "recurring", "unused"} for s in sigs)