"""Tests for runtime backup creation, restore, and retention cleanup."""

import json
import sqlite3
from datetime import UTC, datetime, timedelta

import pytest

import atocore.config as config
from atocore.models.database import init_db
from atocore.ops.backup import (
    cleanup_old_backups,
    create_runtime_backup,
    list_runtime_backups,
    restore_runtime_backup,
    validate_backup,
)


def test_create_runtime_backup_copies_db_and_registry(tmp_path, monkeypatch):
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    registry_path = tmp_path / "config" / "project-registry.json"
    registry_path.parent.mkdir(parents=True)
    registry_path.write_text('{"projects":[{"id":"p01-example","aliases":[],"ingest_roots":[{"source":"vault","subpath":"incoming/projects/p01-example"}]}]}\n', encoding="utf-8")

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()
        with sqlite3.connect(str(config.settings.db_path)) as conn:
            conn.execute("INSERT INTO projects (id, name) VALUES (?, ?)", ("p01", "P01 Example"))
            conn.commit()

        result = create_runtime_backup(datetime(2026, 4, 6, 18, 0, 0, tzinfo=UTC))
    finally:
        config.settings = original_settings

    db_snapshot = tmp_path / "backups" / "snapshots" / "20260406T180000Z" / "db" / "atocore.db"
    registry_snapshot = (
        tmp_path / "backups" / "snapshots" / "20260406T180000Z" / "config" / "project-registry.json"
    )
    metadata_path = (
        tmp_path / "backups" / "snapshots" / "20260406T180000Z" / "backup-metadata.json"
    )

    assert result["db_snapshot_path"] == str(db_snapshot)
    assert db_snapshot.exists()
    assert registry_snapshot.exists()
    assert metadata_path.exists()

    with sqlite3.connect(str(db_snapshot)) as conn:
        row = conn.execute("SELECT name FROM projects WHERE id = ?", ("p01",)).fetchone()
    assert row[0] == "P01 Example"

    metadata = json.loads(metadata_path.read_text(encoding="utf-8"))
    assert metadata["registry_snapshot_path"] == str(registry_snapshot)


def test_create_runtime_backup_includes_chroma_when_requested(tmp_path, monkeypatch):
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()

        # Create a fake chroma directory tree with a couple of files.
        chroma_dir = config.settings.chroma_path
        (chroma_dir / "collection-a").mkdir(parents=True, exist_ok=True)
        (chroma_dir / "collection-a" / "data.bin").write_bytes(b"\x00\x01\x02\x03")
        (chroma_dir / "metadata.json").write_text('{"ok":true}', encoding="utf-8")

        result = create_runtime_backup(
            datetime(2026, 4, 6, 20, 0, 0, tzinfo=UTC),
            include_chroma=True,
        )
    finally:
        config.settings = original_settings

    chroma_snapshot_root = (
        tmp_path / "backups" / "snapshots" / "20260406T200000Z" / "chroma"
    )
    assert result["chroma_snapshot_included"] is True
    assert result["chroma_snapshot_path"] == str(chroma_snapshot_root)
    assert result["chroma_snapshot_files"] >= 2
    assert result["chroma_snapshot_bytes"] > 0
    assert (chroma_snapshot_root / "collection-a" / "data.bin").exists()
    assert (chroma_snapshot_root / "metadata.json").exists()


def test_list_and_validate_runtime_backups(tmp_path, monkeypatch):
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()
        first = create_runtime_backup(datetime(2026, 4, 6, 21, 0, 0, tzinfo=UTC))
        second = create_runtime_backup(datetime(2026, 4, 6, 22, 0, 0, tzinfo=UTC))

        listing = list_runtime_backups()
        first_validation = validate_backup("20260406T210000Z")
        second_validation = validate_backup("20260406T220000Z")
        missing_validation = validate_backup("20260101T000000Z")
    finally:
        config.settings = original_settings

    assert len(listing) == 2
    assert {entry["stamp"] for entry in listing} == {
        "20260406T210000Z",
        "20260406T220000Z",
    }
    for entry in listing:
        assert entry["has_metadata"] is True
        assert entry["metadata"]["db_snapshot_path"]

    assert first_validation["valid"] is True
    assert first_validation["db_ok"] is True
    assert first_validation["errors"] == []

    assert second_validation["valid"] is True

    assert missing_validation["exists"] is False
    assert "snapshot_directory_missing" in missing_validation["errors"]

    # both metadata paths are reachable on disk
    assert json.loads(
        (tmp_path / "backups" / "snapshots" / "20260406T210000Z" / "backup-metadata.json")
        .read_text(encoding="utf-8")
    )["db_snapshot_path"] == first["db_snapshot_path"]
    assert second["db_snapshot_path"].endswith("atocore.db")


def test_create_runtime_backup_handles_missing_registry(tmp_path, monkeypatch):
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()
        result = create_runtime_backup(datetime(2026, 4, 6, 19, 0, 0, tzinfo=UTC))
    finally:
        config.settings = original_settings

    assert result["registry_snapshot_path"] == ""


def test_restore_refuses_without_confirm_service_stopped(tmp_path, monkeypatch):
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()
        create_runtime_backup(datetime(2026, 4, 9, 10, 0, 0, tzinfo=UTC))

        with pytest.raises(RuntimeError, match="confirm_service_stopped"):
            restore_runtime_backup("20260409T100000Z")
    finally:
        config.settings = original_settings


def test_restore_raises_on_invalid_backup(tmp_path, monkeypatch):
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()
        with pytest.raises(RuntimeError, match="failed validation"):
            restore_runtime_backup(
                "20250101T000000Z", confirm_service_stopped=True
            )
    finally:
        config.settings = original_settings


def test_restore_round_trip_reverses_post_backup_mutations(tmp_path, monkeypatch):
    """Canonical drill: snapshot -> mutate -> restore -> mutation gone."""
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    registry_path = tmp_path / "config" / "project-registry.json"
    registry_path.parent.mkdir(parents=True)
    registry_path.write_text(
        '{"projects":[{"id":"p01-example","aliases":[],'
        '"ingest_roots":[{"source":"vault","subpath":"incoming/projects/p01-example"}]}]}\n',
        encoding="utf-8",
    )

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()

        # 1. Seed baseline state that should SURVIVE the restore.
        with sqlite3.connect(str(config.settings.db_path)) as conn:
            conn.execute(
                "INSERT INTO projects (id, name) VALUES (?, ?)",
                ("p01", "Baseline Project"),
            )
            conn.commit()

        # 2. Create the backup we're going to restore to.
        create_runtime_backup(datetime(2026, 4, 9, 11, 0, 0, tzinfo=UTC))
        stamp = "20260409T110000Z"

        # 3. Mutate live state AFTER the backup — this is what the
        #    restore should reverse.
        with sqlite3.connect(str(config.settings.db_path)) as conn:
            conn.execute(
                "INSERT INTO projects (id, name) VALUES (?, ?)",
                ("p99", "Post Backup Mutation"),
            )
            conn.commit()

        # Confirm the mutation is present before restore.
        with sqlite3.connect(str(config.settings.db_path)) as conn:
            row = conn.execute(
                "SELECT name FROM projects WHERE id = ?", ("p99",)
            ).fetchone()
            assert row is not None and row[0] == "Post Backup Mutation"

        # 4. Restore — the drill procedure. Explicit confirm_service_stopped.
        result = restore_runtime_backup(
            stamp, confirm_service_stopped=True
        )

        # 5. Verify restore report
        assert result["stamp"] == stamp
        assert result["db_restored"] is True
        assert result["registry_restored"] is True
        assert result["restored_integrity_ok"] is True
        assert result["pre_restore_snapshot"] is not None

        # 6. Verify live state reflects the restore: baseline survived,
        #    post-backup mutation is gone.
        with sqlite3.connect(str(config.settings.db_path)) as conn:
            baseline = conn.execute(
                "SELECT name FROM projects WHERE id = ?", ("p01",)
            ).fetchone()
            mutation = conn.execute(
                "SELECT name FROM projects WHERE id = ?", ("p99",)
            ).fetchone()
        assert baseline is not None and baseline[0] == "Baseline Project"
        assert mutation is None

        # 7. Pre-restore safety snapshot DOES contain the mutation —
        #    it captured current state before overwriting. This is the
        #    reversibility guarantee: the operator can restore back to
        #    it if the restore itself was a mistake.
        pre_stamp = result["pre_restore_snapshot"]
        pre_validation = validate_backup(pre_stamp)
        assert pre_validation["valid"] is True
        pre_db_path = pre_validation["metadata"]["db_snapshot_path"]
        with sqlite3.connect(pre_db_path) as conn:
            pre_mutation = conn.execute(
                "SELECT name FROM projects WHERE id = ?", ("p99",)
            ).fetchone()
        assert pre_mutation is not None and pre_mutation[0] == "Post Backup Mutation"
    finally:
        config.settings = original_settings


def test_restore_round_trip_with_chroma(tmp_path, monkeypatch):
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()

        # Seed baseline chroma state that should survive restore.
        chroma_dir = config.settings.chroma_path
        (chroma_dir / "coll-a").mkdir(parents=True, exist_ok=True)
        (chroma_dir / "coll-a" / "baseline.bin").write_bytes(b"baseline")

        create_runtime_backup(
            datetime(2026, 4, 9, 12, 0, 0, tzinfo=UTC), include_chroma=True
        )
        stamp = "20260409T120000Z"

        # Mutate chroma after backup: add a file + remove baseline.
        (chroma_dir / "coll-a" / "post_backup.bin").write_bytes(b"post")
        (chroma_dir / "coll-a" / "baseline.bin").unlink()

        result = restore_runtime_backup(
            stamp, confirm_service_stopped=True
        )

        assert result["chroma_restored"] is True
        assert (chroma_dir / "coll-a" / "baseline.bin").exists()
        assert not (chroma_dir / "coll-a" / "post_backup.bin").exists()
    finally:
        config.settings = original_settings


def test_restore_chroma_does_not_unlink_destination_directory(tmp_path, monkeypatch):
    """Regression: restore must not rmtree the chroma dir itself.

    In a Dockerized deployment the chroma dir is a bind-mounted
    volume. Calling shutil.rmtree on a mount point raises
    ``OSError [Errno 16] Device or resource busy``, which broke the
    first real Dalidou drill on 2026-04-09. The fix clears the
    directory's CONTENTS and copytree(dirs_exist_ok=True) into it,
    keeping the directory inode (and any bind mount) intact.

    This test captures the inode of the destination directory before
    and after restore and asserts they match — that's what a
    bind-mounted chroma dir would also see.
    """
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()

        chroma_dir = config.settings.chroma_path
        (chroma_dir / "coll-a").mkdir(parents=True, exist_ok=True)
        (chroma_dir / "coll-a" / "baseline.bin").write_bytes(b"baseline")

        create_runtime_backup(
            datetime(2026, 4, 9, 15, 0, 0, tzinfo=UTC), include_chroma=True
        )

        # Capture the destination directory's stat signature before restore.
        chroma_stat_before = chroma_dir.stat()

        # Add a file post-backup so restore has work to do.
        (chroma_dir / "coll-a" / "post_backup.bin").write_bytes(b"post")

        restore_runtime_backup(
            "20260409T150000Z", confirm_service_stopped=True
        )

        # Directory still exists (would have failed on mount point) and
        # its st_ino matches — the mount itself wasn't unlinked.
        assert chroma_dir.exists()
        chroma_stat_after = chroma_dir.stat()
        assert chroma_stat_before.st_ino == chroma_stat_after.st_ino, (
            "chroma directory inode changed — restore recreated the "
            "directory instead of clearing its contents; this would "
            "fail on a Docker bind-mounted volume"
        )
        # And the contents did actually get restored.
        assert (chroma_dir / "coll-a" / "baseline.bin").exists()
        assert not (chroma_dir / "coll-a" / "post_backup.bin").exists()
    finally:
        config.settings = original_settings


def test_restore_skips_pre_snapshot_when_requested(tmp_path, monkeypatch):
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()
        create_runtime_backup(datetime(2026, 4, 9, 13, 0, 0, tzinfo=UTC))

        before_count = len(list_runtime_backups())

        result = restore_runtime_backup(
            "20260409T130000Z",
            confirm_service_stopped=True,
            pre_restore_snapshot=False,
        )

        after_count = len(list_runtime_backups())
        assert result["pre_restore_snapshot"] is None
        assert after_count == before_count
    finally:
        config.settings = original_settings


def test_create_backup_includes_validation_fields(tmp_path, monkeypatch):
    """Task B: create_runtime_backup auto-validates and reports result."""
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()
        result = create_runtime_backup(datetime(2026, 4, 11, 10, 0, 0, tzinfo=UTC))
    finally:
        config.settings = original_settings

    assert "validated" in result
    assert "validation_errors" in result
    assert result["validated"] is True
    assert result["validation_errors"] == []


def test_create_backup_validation_failure_does_not_raise(tmp_path, monkeypatch):
    """Task B: if post-backup validation fails, backup still returns metadata."""
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    def _broken_validate(stamp):
        return {"valid": False, "errors": ["db_missing", "metadata_missing"]}

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()
        monkeypatch.setattr("atocore.ops.backup.validate_backup", _broken_validate)
        result = create_runtime_backup(datetime(2026, 4, 11, 11, 0, 0, tzinfo=UTC))
    finally:
        config.settings = original_settings

    # Should NOT have raised — backup still returned metadata
    assert result["validated"] is False
    assert result["validation_errors"] == ["db_missing", "metadata_missing"]
    # Core backup fields still present
    assert "db_snapshot_path" in result
    assert "created_at" in result


def test_restore_cleans_stale_wal_sidecars(tmp_path, monkeypatch):
    """Stale WAL/SHM sidecars must not carry bytes past the restore.

    Note: after restore runs, PRAGMA integrity_check reopens the
    restored db which may legitimately recreate a fresh -wal. So we
    assert that the STALE byte marker no longer appears in either
    sidecar, not that the files are absent.
    """
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )

    original_settings = config.settings
    try:
        config.settings = config.Settings()
        init_db()
        create_runtime_backup(datetime(2026, 4, 9, 14, 0, 0, tzinfo=UTC))

        # Write fake stale WAL/SHM next to the live db with an
        # unmistakable marker.
        target_db = config.settings.db_path
        wal = target_db.with_name(target_db.name + "-wal")
        shm = target_db.with_name(target_db.name + "-shm")
        stale_marker = b"STALE-SIDECAR-MARKER-DO-NOT-SURVIVE"
        wal.write_bytes(stale_marker)
        shm.write_bytes(stale_marker)
        assert wal.exists() and shm.exists()

        restore_runtime_backup(
            "20260409T140000Z", confirm_service_stopped=True
        )

        # The restored db must pass integrity check (tested elsewhere);
        # here we just confirm that no file next to it still contains
        # the stale marker from the old live process.
        for sidecar in (wal, shm):
            if sidecar.exists():
                assert stale_marker not in sidecar.read_bytes(), (
                    f"{sidecar.name} still carries stale marker"
                )
    finally:
        config.settings = original_settings


# ---------------------------------------------------------------------------
# Task C: Backup retention cleanup
# ---------------------------------------------------------------------------


def _setup_cleanup_env(tmp_path, monkeypatch):
    """Helper: configure env, init db, return snapshots_root."""
    monkeypatch.setenv("ATOCORE_DATA_DIR", str(tmp_path / "data"))
    monkeypatch.setenv("ATOCORE_BACKUP_DIR", str(tmp_path / "backups"))
    monkeypatch.setenv(
        "ATOCORE_PROJECT_REGISTRY_PATH", str(tmp_path / "config" / "project-registry.json")
    )
    original = config.settings
    config.settings = config.Settings()
    init_db()
    snapshots_root = config.settings.resolved_backup_dir / "snapshots"
    snapshots_root.mkdir(parents=True, exist_ok=True)
    return original, snapshots_root


def _seed_snapshots(snapshots_root, dates):
    """Create minimal valid snapshot dirs for the given datetimes."""
    for dt in dates:
        stamp = dt.strftime("%Y%m%dT%H%M%SZ")
        snap_dir = snapshots_root / stamp
        db_dir = snap_dir / "db"
        db_dir.mkdir(parents=True, exist_ok=True)
        db_path = db_dir / "atocore.db"
        conn = sqlite3.connect(str(db_path))
        conn.execute("CREATE TABLE IF NOT EXISTS _marker (id INTEGER)")
        conn.close()
        metadata = {
            "created_at": dt.isoformat(),
            "backup_root": str(snap_dir),
            "db_snapshot_path": str(db_path),
            "db_size_bytes": db_path.stat().st_size,
            "registry_snapshot_path": "",
            "chroma_snapshot_path": "",
            "chroma_snapshot_bytes": 0,
            "chroma_snapshot_files": 0,
            "chroma_snapshot_included": False,
            "vector_store_note": "",
        }
        (snap_dir / "backup-metadata.json").write_text(
            json.dumps(metadata, indent=2) + "\n", encoding="utf-8"
        )


def test_cleanup_empty_dir(tmp_path, monkeypatch):
    original, _ = _setup_cleanup_env(tmp_path, monkeypatch)
    try:
        result = cleanup_old_backups()
        assert result["kept"] == 0
        assert result["would_delete"] == 0
        assert result["dry_run"] is True
    finally:
        config.settings = original


def test_cleanup_dry_run_identifies_old_snapshots(tmp_path, monkeypatch):
    original, snapshots_root = _setup_cleanup_env(tmp_path, monkeypatch)
    try:
        # 10 daily snapshots Apr 2-11 (avoiding Apr 1 which is monthly).
        base = datetime(2026, 4, 2, 12, 0, 0, tzinfo=UTC)
        dates = [base + timedelta(days=i) for i in range(10)]
        _seed_snapshots(snapshots_root, dates)

        result = cleanup_old_backups()
        assert result["dry_run"] is True
        # 7 daily kept + Apr 5 is a Sunday (weekly) but already in daily.
        # Apr 2, 3, 4 are oldest. Apr 5 is Sunday → kept as weekly.
        # So: 7 daily (Apr 5-11) + 1 weekly (Apr 5 already counted) = 7 daily.
        # But Apr 5 is the 8th newest day from Apr 11... wait.
        # Newest 7 days: Apr 11,10,9,8,7,6,5 → all kept as daily.
        # Remaining: Apr 4,3,2. Apr 5 is already in daily.
        # None of Apr 4,3,2 are Sunday or 1st → all 3 deleted.
        assert result["kept"] == 7
        assert result["would_delete"] == 3
        assert len(list(snapshots_root.iterdir())) == 10
    finally:
        config.settings = original


def test_cleanup_confirm_deletes(tmp_path, monkeypatch):
    original, snapshots_root = _setup_cleanup_env(tmp_path, monkeypatch)
    try:
        base = datetime(2026, 4, 2, 12, 0, 0, tzinfo=UTC)
        dates = [base + timedelta(days=i) for i in range(10)]
        _seed_snapshots(snapshots_root, dates)

        result = cleanup_old_backups(confirm=True)
        assert result["dry_run"] is False
        assert result["deleted"] == 3
        assert result["kept"] == 7
        assert len(list(snapshots_root.iterdir())) == 7
    finally:
        config.settings = original


def test_cleanup_keeps_last_7_daily(tmp_path, monkeypatch):
    """Exactly 7 snapshots on different days → all kept."""
    original, snapshots_root = _setup_cleanup_env(tmp_path, monkeypatch)
    try:
        base = datetime(2026, 4, 5, 12, 0, 0, tzinfo=UTC)
        dates = [base + timedelta(days=i) for i in range(7)]
        _seed_snapshots(snapshots_root, dates)

        result = cleanup_old_backups()
        assert result["kept"] == 7
        assert result["would_delete"] == 0
    finally:
        config.settings = original


def test_cleanup_keeps_sunday_weekly(tmp_path, monkeypatch):
    """Snapshots on Sundays outside the 7-day window are kept as weekly."""
    original, snapshots_root = _setup_cleanup_env(tmp_path, monkeypatch)
    try:
        # 7 daily snapshots covering Apr 5-11
        base = datetime(2026, 4, 5, 12, 0, 0, tzinfo=UTC)
        daily = [base + timedelta(days=i) for i in range(7)]

        # 2 older Sunday snapshots
        sun1 = datetime(2026, 3, 29, 12, 0, 0, tzinfo=UTC)  # Sunday
        sun2 = datetime(2026, 3, 22, 12, 0, 0, tzinfo=UTC)  # Sunday
        # A non-Sunday old snapshot that should be deleted
        wed = datetime(2026, 3, 25, 12, 0, 0, tzinfo=UTC)   # Wednesday

        _seed_snapshots(snapshots_root, daily + [sun1, sun2, wed])

        result = cleanup_old_backups()
        # 7 daily + 2 Sunday weekly = 9 kept, 1 Wednesday deleted
        assert result["kept"] == 9
        assert result["would_delete"] == 1
    finally:
        config.settings = original


def test_cleanup_keeps_monthly_first(tmp_path, monkeypatch):
    """Snapshots on the 1st of a month outside daily+weekly are kept as monthly."""
    original, snapshots_root = _setup_cleanup_env(tmp_path, monkeypatch)
    try:
        # 7 daily in April 2026
        base = datetime(2026, 4, 5, 12, 0, 0, tzinfo=UTC)
        daily = [base + timedelta(days=i) for i in range(7)]

        # Old monthly 1st snapshots
        m1 = datetime(2026, 1, 1, 12, 0, 0, tzinfo=UTC)
        m2 = datetime(2025, 12, 1, 12, 0, 0, tzinfo=UTC)
        # Old non-1st, non-Sunday snapshot — should be deleted
        old = datetime(2026, 1, 15, 12, 0, 0, tzinfo=UTC)

        _seed_snapshots(snapshots_root, daily + [m1, m2, old])

        result = cleanup_old_backups()
        # 7 daily + 2 monthly = 9 kept, 1 deleted
        assert result["kept"] == 9
        assert result["would_delete"] == 1
    finally:
        config.settings = original


def test_cleanup_unparseable_stamp_skipped(tmp_path, monkeypatch):
    """Directories with unparseable names are ignored, not deleted."""
    original, snapshots_root = _setup_cleanup_env(tmp_path, monkeypatch)
    try:
        base = datetime(2026, 4, 5, 12, 0, 0, tzinfo=UTC)
        _seed_snapshots(snapshots_root, [base])

        bad_dir = snapshots_root / "not-a-timestamp"
        bad_dir.mkdir()

        result = cleanup_old_backups(confirm=True)
        assert result.get("unparseable") == ["not-a-timestamp"]
        assert bad_dir.exists()
        assert result["kept"] == 1
    finally:
        config.settings = original