"""Model-provider selection + the null-provider fail-loud behavior.

No network: we only assert which provider the factory returns and that the null
providers raise a clear error. (Live LLM/embedding calls aren't unit-tested.)
"""

import pytest

from app.api.deps import get_embedding_provider, get_llm_provider
from app.core.config import get_settings
from app.integrations.models.anthropic_provider import AnthropicLLMProvider
from app.integrations.models.base import ModelProviderNotConfigured
from app.integrations.models.null import NullEmbeddingProvider, NullLLMProvider


async def test_default_llm_is_null_and_fails_loud(monkeypatch):
    monkeypatch.setattr(get_settings(), "model_provider", "null")
    provider = get_llm_provider()
    assert isinstance(provider, NullLLMProvider)
    with pytest.raises(ModelProviderNotConfigured):
        await provider.complete(prompt="hello")


async def test_anthropic_selected_when_configured(monkeypatch):
    s = get_settings()
    monkeypatch.setattr(s, "model_provider", "anthropic")
    monkeypatch.setattr(s, "anthropic_api_key", "sk-ant-test-key")
    monkeypatch.setattr(s, "llm_model", "claude-opus-4-8")
    assert isinstance(get_llm_provider(), AnthropicLLMProvider)  # no network call


async def test_anthropic_without_key_falls_back_to_null(monkeypatch):
    s = get_settings()
    monkeypatch.setattr(s, "model_provider", "anthropic")
    monkeypatch.setattr(s, "anthropic_api_key", None)
    assert isinstance(get_llm_provider(), NullLLMProvider)


async def test_embedding_default_is_null_and_fails_loud():
    provider = get_embedding_provider()
    assert isinstance(provider, NullEmbeddingProvider)
    with pytest.raises(ModelProviderNotConfigured):
        await provider.embed(["text"])