"""Unit tests for scripts/docker_rebootstrap_nous_session.py.

The boot-time re-seed is the load-bearing "does not clobber a healthy session"
guard: it must overwrite the on-disk Nous provider entry ONLY when that entry is
provably terminal (quarantine marker + no usable tokens), and no-op in every
other case. These are pure-stdlib tmp_path tests (no container build).
"""
from __future__ import annotations

import importlib.util
import json
from pathlib import Path

# Import the stdlib-only boot helper by path (it lives under scripts/, not an
# installed package) — mirrors the repo's other scripts/-helper tests.
_SCRIPT = Path(__file__).resolve().parents[2] / "scripts" / "docker_rebootstrap_nous_session.py"
_spec = importlib.util.spec_from_file_location("docker_rebootstrap_nous_session", _SCRIPT)
mod = importlib.util.module_from_spec(_spec)
_spec.loader.exec_module(mod)


def _terminal_nous_state():
    """On-disk shape after a terminal quarantine: tokens cleared, marker set."""
    return {
        "portal_base_url": "https://portal.example.com",
        "client_id": "hermes-cli-vps",
        "last_auth_error": {
            "provider": "nous",
            "code": "invalid_grant",
            "relogin_required": True,
        },
    }


def _healthy_nous_state():
    return {
        "portal_base_url": "https://portal.example.com",
        "client_id": "hermes-cli-vps",
        "access_token": "live-at",
        "refresh_token": "live-rt",
    }


def _write_auth(tmp_path: Path, providers: dict) -> str:
    p = tmp_path / "auth.json"
    p.write_text(json.dumps({"version": 1, "providers": providers}))
    return str(p)


_FRESH_SEED = json.dumps({
    "version": 1,
    "providers": {
        "nous": {
            "portal_base_url": "https://portal.example.com",
            "client_id": "hermes-cli-vps",
            "access_token": "FRESH-at",
            "refresh_token": "FRESH-rt",
        }
    },
})


def test_reseeds_terminal_entry(tmp_path):
    """Terminal on-disk entry + valid seed → providers.nous replaced."""
    auth = _write_auth(tmp_path, {"nous": _terminal_nous_state()})
    result = mod.reseed_if_terminal(auth, _FRESH_SEED)
    assert result == "reseeded"
    store = json.loads(Path(auth).read_text())
    assert store["providers"]["nous"]["refresh_token"] == "FRESH-rt"
    assert "last_auth_error" not in store["providers"]["nous"]


def test_does_not_clobber_healthy_entry(tmp_path):
    """LOAD-BEARING: a healthy (live-token) entry must never be overwritten."""
    auth = _write_auth(tmp_path, {"nous": _healthy_nous_state()})
    result = mod.reseed_if_terminal(auth, _FRESH_SEED)
    assert result == "not_terminal"
    store = json.loads(Path(auth).read_text())
    # Untouched — still the live tokens, not the seed.
    assert store["providers"]["nous"]["refresh_token"] == "live-rt"


def test_marker_but_live_token_is_not_terminal(tmp_path):
    """Stale marker + a live token present → NOT terminal (don't clobber)."""
    state = _terminal_nous_state()
    state["refresh_token"] = "somehow-live"
    auth = _write_auth(tmp_path, {"nous": state})
    assert mod.reseed_if_terminal(auth, _FRESH_SEED) == "not_terminal"


def test_preserves_other_providers(tmp_path):
    """Re-seed swaps ONLY providers.nous; other providers survive intact."""
    auth = _write_auth(tmp_path, {
        "nous": _terminal_nous_state(),
        "openai-codex": {"tokens": {"access_token": "codex-at"}},
    })
    assert mod.reseed_if_terminal(auth, _FRESH_SEED) == "reseeded"
    store = json.loads(Path(auth).read_text())
    assert store["providers"]["openai-codex"]["tokens"]["access_token"] == "codex-at"
    assert store["providers"]["nous"]["refresh_token"] == "FRESH-rt"


def test_no_seed_is_noop(tmp_path):
    auth = _write_auth(tmp_path, {"nous": _terminal_nous_state()})
    assert mod.reseed_if_terminal(auth, "") == "no_seed"


def test_bad_seed_is_noop(tmp_path):
    auth = _write_auth(tmp_path, {"nous": _terminal_nous_state()})
    assert mod.reseed_if_terminal(auth, "}{not json") == "bad_seed"
    # Original terminal entry left untouched.
    store = json.loads(Path(auth).read_text())
    assert store["providers"]["nous"]["last_auth_error"]["relogin_required"] is True


def test_seed_without_nous_entry_is_noop(tmp_path):
    auth = _write_auth(tmp_path, {"nous": _terminal_nous_state()})
    seed = json.dumps({"version": 1, "providers": {"openai-codex": {}}})
    assert mod.reseed_if_terminal(auth, seed) == "bad_seed"


def test_absent_auth_file_defers_to_bootstrap(tmp_path):
    """No auth.json → blank volume; the normal *_BOOTSTRAP path handles it."""
    auth = str(tmp_path / "auth.json")
    assert mod.reseed_if_terminal(auth, _FRESH_SEED) == "no_auth_file"


def test_unreadable_auth_file_is_left_alone(tmp_path):
    p = tmp_path / "auth.json"
    p.write_text("}{ corrupt")
    assert mod.reseed_if_terminal(str(p), _FRESH_SEED) == "auth_unreadable"
    # Not overwritten.
    assert p.read_text() == "}{ corrupt"


def test_terminal_entry_missing_marker_is_not_terminal(tmp_path):
    """No last_auth_error at all (e.g. a merely-expired but not-quarantined
    entry) → not terminal, no re-seed."""
    auth = _write_auth(tmp_path, {"nous": {"client_id": "hermes-cli-vps"}})
    assert mod.reseed_if_terminal(auth, _FRESH_SEED) == "not_terminal"
