import pytest
from pydantic import ValidationError

from mcp_docugen.config import Settings


def test_settings_loads_from_env(monkeypatch, tmp_path):
    monkeypatch.setenv("API_KEY", "test-api-key")
    monkeypatch.setenv("OPENROUTER_API_KEY", "sk-or-test")
    monkeypatch.setenv("PUBLIC_BASE_URL", "https://mcp.example.com")
    monkeypatch.setenv("DATA_DIR", str(tmp_path))

    settings = Settings()

    assert settings.api_key == "test-api-key"
    assert settings.openrouter_api_key == "sk-or-test"
    assert settings.public_base_url == "https://mcp.example.com"
    assert settings.data_dir == tmp_path
    assert settings.llm_model_default == "anthropic/claude-sonnet-4"
    assert settings.asset_ttl_days == 30
    assert settings.max_image_size_mb == 10
    assert settings.llm_timeout_seconds == 60
    assert settings.openrouter_base_url == "https://openrouter.ai/api/v1"


def test_settings_missing_required_fails(monkeypatch, tmp_path):
    monkeypatch.delenv("API_KEY", raising=False)
    monkeypatch.delenv("OPENROUTER_API_KEY", raising=False)
    monkeypatch.delenv("PUBLIC_BASE_URL", raising=False)
    monkeypatch.setenv("DATA_DIR", str(tmp_path))

    with pytest.raises(ValidationError):
        Settings(_env_file=None)


def test_public_base_url_strips_trailing_slash(monkeypatch, tmp_path):
    monkeypatch.setenv("API_KEY", "k-with-long-enough")
    monkeypatch.setenv("OPENROUTER_API_KEY", "sk-long-enough")
    monkeypatch.setenv("PUBLIC_BASE_URL", "https://mcp.example.com/")
    monkeypatch.setenv("DATA_DIR", str(tmp_path))

    settings = Settings()

    assert settings.public_base_url == "https://mcp.example.com"