from pathlib import Path

import pytest

from tools import run_destructive_tests


def test_reuses_initial_backup_across_test_attempts(tmp_path: Path) -> None:
    data_path = tmp_path / "data"
    backup_root = tmp_path / ".test-backups"
    data_path.mkdir()
    backup_root.mkdir()
    (data_path / "transcription.db").write_text("original", encoding="utf-8")

    initial_backup = run_destructive_tests.create_or_reuse_backup(data_path, backup_root)
    (data_path / "transcription.db").write_text("overwritten", encoding="utf-8")
    reused_backup = run_destructive_tests.create_or_reuse_backup(data_path, backup_root)

    assert reused_backup == initial_backup
    assert (reused_backup / "transcription.db").read_text(encoding="utf-8") == "original"
    assert [path for path in backup_root.iterdir() if path.is_dir()] == [initial_backup]


def test_missing_active_backup_stops_instead_of_replacing_it(tmp_path: Path) -> None:
    data_path = tmp_path / "data"
    backup_root = tmp_path / ".test-backups"
    data_path.mkdir()
    backup_root.mkdir()
    (data_path / "transcription.db").write_text("post-test", encoding="utf-8")
    (backup_root / run_destructive_tests.ACTIVE_BACKUP_FILENAME).write_text("data-backup-missing", encoding="utf-8")

    with pytest.raises(FileNotFoundError, match="Active backup is missing"):
        run_destructive_tests.create_or_reuse_backup(data_path, backup_root)

    assert not any(path.is_dir() for path in backup_root.iterdir())


def test_closing_cycle_preserves_backup(tmp_path: Path) -> None:
    data_path = tmp_path / "data"
    backup_root = tmp_path / ".test-backups"
    data_path.mkdir()
    backup_root.mkdir()
    (data_path / "transcription.db").write_text("original", encoding="utf-8")
    backup_path = run_destructive_tests.create_or_reuse_backup(data_path, backup_root)

    closed_backup = run_destructive_tests.close_active_backup_cycle(backup_root)

    assert closed_backup == backup_path
    assert backup_path.is_dir()
    assert not (backup_root / run_destructive_tests.ACTIVE_BACKUP_FILENAME).exists()