"""Unit tests for config module."""

import os

from codesnap.utils.config import Config, apply_env_overrides, load_config


class TestConfig:
    """Tests for Config class."""

    def test_default_values(self) -> None:
        config = Config()
        assert config.max_files == 1000
        assert config.max_tokens == 8000
        assert config.default_format == "markdown"

    def test_custom_values(self) -> None:
        config = Config(max_files=500, max_tokens=4000, default_format="json")
        assert config.max_files == 500
        assert config.max_tokens == 4000
        assert config.default_format == "json"

    def test_default_ignore_patterns(self) -> None:
        config = Config()
        assert isinstance(config.ignore_patterns, list)

    def test_default_languages(self) -> None:
        config = Config()
        assert isinstance(config.included_languages, list)
        assert isinstance(config.excluded_languages, list)


class TestLoadConfig:
    """Tests for load_config function."""

    def test_load_default_config(self) -> None:
        config = load_config()
        assert config.max_files == 1000
        assert config.max_tokens == 8000

    def test_load_nonexistent_file(self) -> None:
        from pathlib import Path
        config = load_config(Path("/nonexistent/path.tomll"))
        assert config.max_files == 1000


class TestApplyEnvOverrides:
    """Tests for apply_env_overrides function."""

    def test_no_overrides(self) -> None:
        config = Config()
        result = apply_env_overrides(config)
        assert result.max_files == 1000

    def test_max_files_override(self) -> None:
        os.environ["CODSNAP_MAX_FILES"] = "500"
        try:
            config = Config()
            result = apply_env_overrides(config)
            assert result.max_files == 500
        finally:
            del os.environ["CODSNAP_MAX_FILES"]

    def test_max_tokens_override(self) -> None:
        os.environ["CODSNAP_MAX_TOKENS"] = "4000"
        try:
            config = Config()
            result = apply_env_overrides(config)
            assert result.max_tokens == 4000
        finally:
            del os.environ["CODSNAP_MAX_TOKENS"]