"""Tests for configuration management."""

import pytest
from pydantic import ValidationError

from aegis_gitea_mcp.config import Settings, get_settings, reset_settings


def test_settings_from_env(mock_env: None) -> None:
    """Test loading settings from environment variables."""
    settings = get_settings()
    
    assert settings.gitea_base_url == "https://gitea.example.com"
    assert settings.gitea_token == "test-token-12345"
    assert settings.mcp_host == "0.0.0.0"
    assert settings.mcp_port == 8080
    assert settings.log_level == "DEBUG"


def test_settings_defaults(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test default values when not specified."""
    monkeypatch.setenv("GITEA_URL", "https://gitea.example.com")
    monkeypatch.setenv("GITEA_TOKEN", "test-token")
    
    settings = get_settings()
    
    assert settings.mcp_host == "0.0.0.0"
    assert settings.mcp_port == 8080
    assert settings.log_level == "INFO"
    assert settings.max_file_size_bytes == 1_048_576
    assert settings.request_timeout_seconds == 30


def test_settings_validation_missing_required(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test that missing required fields raise validation errors."""
    monkeypatch.delenv("GITEA_URL", raising=False)
    monkeypatch.delenv("GITEA_TOKEN", raising=False)
    
    reset_settings()
    
    with pytest.raises(ValidationError):
        get_settings()


def test_settings_invalid_log_level(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test that invalid log levels are rejected."""
    monkeypatch.setenv("GITEA_URL", "https://gitea.example.com")
    monkeypatch.setenv("GITEA_TOKEN", "test-token")
    monkeypatch.setenv("LOG_LEVEL", "INVALID")
    
    reset_settings()
    
    with pytest.raises(ValidationError):
        get_settings()


def test_settings_empty_token(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test that empty tokens are rejected."""
    monkeypatch.setenv("GITEA_URL", "https://gitea.example.com")
    monkeypatch.setenv("GITEA_TOKEN", "   ")
    
    reset_settings()
    
    with pytest.raises(ValidationError):
        get_settings()


def test_settings_singleton() -> None:
    """Test that get_settings returns same instance."""
    settings1 = get_settings()
    settings2 = get_settings()
    
    assert settings1 is settings2