ATOCore/tests/test_backup.py

"""Tests for runtime backup creation and restore."""

import json
import sqlite3
from datetime import UTC, datetime

import pytest

import atocore.config as config
from atocore.models.database import init_db
from atocore.ops.backup import (
    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_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_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