"""Tests for the pluggable secret backends (file default, OpenBao opt-in)."""

from __future__ import annotations

from pathlib import Path

from castle_core.secret_backends import (
    FileSecretBackend,
    OpenBaoBackend,
    build_backend,
)


def test_file_backend_read_hit(tmp_path: Path) -> None:
    (tmp_path / "MY_SECRET").write_text("value\n")
    assert FileSecretBackend(tmp_path).read("MY_SECRET") == "value"


def test_file_backend_read_miss(tmp_path: Path) -> None:
    assert FileSecretBackend(tmp_path).read("ABSENT") is None


def test_file_backend_write_read_list_delete(tmp_path: Path) -> None:
    b = FileSecretBackend(tmp_path)
    assert b.list_names() == []
    b.write("A", "one")
    b.write("B", "two")
    assert b.read("A") == "one"
    assert b.list_names() == ["A", "B"]
    b.delete("A")
    assert b.read("A") is None
    assert b.list_names() == ["B"]
    b.delete("ABSENT")  # no error


def test_build_backend_defaults_to_file(tmp_path: Path, monkeypatch) -> None:
    monkeypatch.delenv("CASTLE_SECRET_BACKEND", raising=False)
    assert isinstance(build_backend(tmp_path), FileSecretBackend)


def test_build_backend_openbao_selected(tmp_path: Path, monkeypatch) -> None:
    monkeypatch.setenv("CASTLE_SECRET_BACKEND", "openbao")
    assert isinstance(build_backend(tmp_path), OpenBaoBackend)


def test_openbao_falls_back_to_file_when_unreachable(tmp_path: Path) -> None:
    """An unreachable vault (or empty token) resolves via the file fallback."""
    (tmp_path / "ONLY_IN_FILE").write_text("from-file")
    backend = OpenBaoBackend(
        addr="http://127.0.0.1:1",  # nothing listening
        token="dummy",
        mount="castle",
        fallback=FileSecretBackend(tmp_path),
    )
    assert backend.read("ONLY_IN_FILE") == "from-file"
    assert backend.read("NOT_ANYWHERE") is None


def test_openbao_empty_token_uses_fallback(tmp_path: Path) -> None:
    (tmp_path / "K").write_text("v")
    backend = OpenBaoBackend(
        addr="http://127.0.0.1:8200",
        token="",  # no token → never hits the network
        mount="castle",
        fallback=FileSecretBackend(tmp_path),
    )
    assert backend.read("K") == "v"