"""Tests for configuration management."""

import os
import tempfile
from pathlib import Path

import pytest
import yaml

from mockapi.core.config import Config, load_config


class TestConfig:
    """Test cases for Config."""

    def test_default_values(self):
        """Test default configuration values."""
        cfg = Config()
        assert cfg.port == 8080
        assert cfg.host == "0.0.0.0"
        assert cfg.delay == 0
        assert cfg.random_delay is False
        assert cfg.seed == 42
        assert cfg.validate_requests is True

    def test_load_from_dict(self):
        """Test loading config from dictionary."""
        cfg = Config()
        cfg.port = 3000
        cfg.host = "localhost"
        assert cfg.port == 3000
        assert cfg.host == "localhost"

    def test_to_dict(self):
        """Test converting config to dictionary."""
        cfg = Config()
        cfg.port = 9000
        cfg.host = "127.0.0.1"
        cfg.delay = 100

        d = cfg.to_dict()
        assert d["port"] == 9000
        assert d["host"] == "127.0.0.1"
        assert d["delay"] == 100

    def test_load_from_env(self):
        """Test loading config from environment variables."""
        os.environ["MOCKAPI_PORT"] = "5000"
        os.environ["MOCKAPI_HOST"] = "0.0.0.0"

        cfg = Config.load()
        assert cfg.port == 5000
        assert cfg.host == "0.0.0.0"

        del os.environ["MOCKAPI_PORT"]
        del os.environ["MOCKAPI_HOST"]

    def test_load_from_file(self):
        """Test loading config from YAML file."""
        with tempfile.NamedTemporaryFile(
            mode="w", suffix=".yaml", delete=False
        ) as f:
            yaml.dump(
                {
                    "port": 8888,
                    "host": "localhost",
                    "delay": 200,
                    "seed": 123,
                },
                f,
            )
            f.flush()

            cfg = Config.load(config_path=f.name)
            assert cfg.port == 8888
            assert cfg.host == "localhost"
            assert cfg.delay == 200
            assert cfg.seed == 123

            Path(f.name).unlink()

    def test_env_overrides_file(self):
        """Test that environment variables override file config."""
        with tempfile.NamedTemporaryFile(
            mode="w", suffix=".yaml", delete=False
        ) as f:
            yaml.dump({"port": 8888}, f)
            f.flush()

            os.environ["MOCKAPI_PORT"] = "9999"
            cfg = Config.load(config_path=f.name)
            assert cfg.port == 9999

            del os.environ["MOCKAPI_PORT"]
            Path(f.name).unlink()

    def test_load_config_default_path(self):
        """Test load_config convenience function."""
        cfg = load_config()
        assert isinstance(cfg, Config)