"""Unit tests: settings defaults & env overrides."""
from __future__ import annotations

from typing import Any

from app.config import Settings


def _settings(**kwargs: Any) -> Settings:
    """Build Settings without reading a .env file (deterministic tests)."""
    kwargs.setdefault("_env_file", None)
    return Settings(**kwargs)  # pyright: ignore[reportCallIssue]  (kwarg exists at runtime)


def test_defaults_match_locked_decisions() -> None:
    s = _settings()
    assert s.llm_chat_model == "turbo"
    assert s.llm_embed_model == "embed"
    assert s.embedding_dim == 768
    assert s.llm_base_url.endswith("/v1")
    assert 0 < s.relevance_threshold < 1
    assert s.top_k_chunks >= 1
    assert s.top_n_docs >= 1
    assert len(s.suggestions) >= 3


def test_env_override(monkeypatch) -> None:
    monkeypatch.setenv("BOR_RELEVANCE_THRESHOLD", "0.42")
    monkeypatch.setenv("BOR_LLM_CHAT_MODEL", "juggernaut")
    s = _settings()
    assert s.relevance_threshold == 0.42
    assert s.llm_chat_model == "juggernaut"


def test_effective_api_key_fallback(monkeypatch) -> None:
    monkeypatch.delenv("AIPI_KEY", raising=False)
    s = _settings()
    assert s.effective_api_key == "not-needed"

    monkeypatch.setenv("AIPI_KEY", "sk-from-env")
    s2 = _settings()
    assert s2.effective_api_key == "sk-from-env"