"""Watcher debounce and CLI smoke tests (SPEC 8, 10.1)."""

from __future__ import annotations

import time
from pathlib import Path

import pytest

from mdcaldav.cli import main
from mdcaldav.config import Config
from mdcaldav.index import Index
from mdcaldav.watcher import Watcher


@pytest.fixture
def index(vault: Path, tmp_path: Path):
    cfg = Config()
    cfg.vault.path = vault
    cfg.index.db = tmp_path / "index.db"
    idx = Index(cfg)
    idx.rescan()
    yield idx
    idx.close()


def _titles(index: Index) -> set[str]:
    return {t.title for t in index.tasks.values()}


def test_watcher_picks_up_a_new_task(index: Index, vault: Path):
    watcher = Watcher(index.cfg, index)
    watcher.start()
    try:
        rel = vault / "daily/2026-01-07.md"
        rel.write_text(rel.read_text() + "- [ ] Order more compost\n")

        deadline = time.monotonic() + 5
        while time.monotonic() < deadline:
            if "Order more compost" in _titles(index):
                break
            time.sleep(0.05)
        assert "Order more compost" in _titles(index)
    finally:
        watcher.stop()


def test_watcher_debounces_a_burst(index: Index, vault: Path):
    """Many rapid saves should collapse into far fewer rescans."""
    watcher = Watcher(index.cfg, index)
    rel = vault / "daily/2026-01-07.md"
    base = index.generation

    for n in range(10):
        rel.write_text(rel.read_text() + f"- [ ] burst {n}\n")
        watcher.touch(rel)
    watcher.flush()

    assert index.generation - base == 1  # one rescan, not ten
    assert "burst 9" in _titles(index)
    watcher.stop()


def test_watcher_ignores_paths_outside_the_vault(index: Index, tmp_path: Path):
    watcher = Watcher(index.cfg, index)
    watcher.touch(tmp_path / "elsewhere.md")
    assert watcher._pending == set()
    watcher.stop()


def test_refresh_if_stale_is_a_noop_when_unchanged(index: Index):
    assert index.refresh_if_stale() is False


def test_refresh_if_stale_detects_deletion(index: Index, vault: Path):
    (vault / "daily/2026-01-07.md").unlink()
    assert index.refresh_if_stale() is True
    assert "Book the soil test" not in _titles(index)


def test_cli_scan(vault: Path, tmp_path: Path, capsys, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    rc = main(["--vault", str(vault), "scan"])
    out = capsys.readouterr().out

    assert rc == 0
    assert "Plan the seed order" in out
    assert "Email the council office" in out  # nested tasks are shown
    assert "[#A] Book the soil test" in out  # priority rendered
    assert "tasks in" in out


def test_cli_doctor(vault: Path, tmp_path: Path, capsys, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    rc = main(["--vault", str(vault), "doctor"])
    out = capsys.readouterr().out

    assert rc == 0
    assert "collections:" in out
    assert "daily" in out


def test_cli_doctor_flags_ambiguous_titles(vault: Path, tmp_path: Path, capsys, monkeypatch):
    monkeypatch.setenv("HOME", str(tmp_path))
    (vault / "daily/dupes.md").write_text("- [ ] same thing\n- [ ] same thing\n")

    main(["--vault", str(vault), "doctor"])
    assert "ambiguous titles" in capsys.readouterr().out