"""Tests for configuration management."""

import os

import pytest
from pydantic import ValidationError

from knowledge_search_mcp.config import Settings


def test_settings_from_env():
    """Test that Settings can be loaded from environment variables."""
    # Environment is set by conftest.py fixture
    settings = Settings.model_validate({})

    assert settings.project_id == "test-project"
    assert settings.location == "us-central1"
    assert settings.bucket == "test-bucket"
    assert settings.index_name == "test-index"
    assert settings.deployed_index_id == "test-deployed-index"


def test_settings_defaults():
    """Test that Settings has correct default values."""
    settings = Settings.model_validate({})

    assert settings.embedding_model == "gemini-embedding-001"
    assert settings.search_limit == 10
    assert settings.log_name == "va_agent_evaluation_logs"
    assert settings.log_level == "INFO"


def test_settings_custom_values(monkeypatch):
    """Test that Settings can be customized via environment."""
    monkeypatch.setenv("EMBEDDING_MODEL", "custom-embedding-model")
    monkeypatch.setenv("SEARCH_LIMIT", "20")
    monkeypatch.setenv("LOG_LEVEL", "DEBUG")

    settings = Settings.model_validate({})

    assert settings.embedding_model == "custom-embedding-model"
    assert settings.search_limit == 20
    assert settings.log_level == "DEBUG"


def test_settings_validation_error():
    """Test that Settings raises ValidationError when required fields are missing."""
    # Clear all env vars temporarily
    required_vars = [
        "PROJECT_ID", "LOCATION", "BUCKET", "INDEX_NAME",
        "DEPLOYED_INDEX_ID", "ENDPOINT_NAME", "ENDPOINT_DOMAIN"
    ]

    # This should work with conftest fixture
    settings = Settings.model_validate({})
    assert settings.project_id == "test-project"