import pytest
import base64
from pathlib import Path


def test_config_defaults(test_env_vars, monkeypatch):
    """测试配置默认值."""
    # Clear GM_DATA_DIR to test default value
    monkeypatch.delenv("GM_DATA_DIR", raising=False)

    # Reload config to pick up the change
    from app.config import Settings
    settings = Settings()

    assert settings.data_dir == Path('./data')
    assert settings.host == '0.0.0.0'
    assert settings.port == 8000


def test_config_from_env(monkeypatch):
    """测试从环境变量读取配置."""
    # Set required security fields
    monkeypatch.setenv("GM_ENCRYPT_KEY", base64.b64encode(b'test-key-32-bytes-long-1234567890').decode())
    monkeypatch.setenv("GM_API_TOKEN", "test-token")
    monkeypatch.setenv("GM_DATA_DIR", "/custom/data")
    monkeypatch.setenv("GM_PORT", "9000")

    # 重新加载配置
    from app.config import Settings
    settings = Settings()

    assert settings.data_dir == Path('/custom/data')
    assert settings.port == 9000


def test_computed_properties(monkeypatch):
    """测试计算属性（db_path, ssh_keys_dir, repos_dir）."""
    # Set required env vars but not GM_DATA_DIR to test default
    monkeypatch.setenv("GM_ENCRYPT_KEY", base64.b64encode(b'test-key-32-bytes-long-1234567890').decode())
    monkeypatch.setenv("GM_API_TOKEN", "test-token")
    monkeypatch.delenv("GM_DATA_DIR", raising=False)

    from app.config import Settings

    # Test with default data_dir
    settings = Settings()
    assert settings.db_path == Path('./data/git_manager.db')
    assert settings.ssh_keys_dir == Path('./data/ssh_keys')
    assert settings.repos_dir == Path('./data/repos')

    # Test with custom data_dir
    monkeypatch.setenv("GM_DATA_DIR", "/custom/data")
    settings = Settings()
    assert settings.db_path == Path('/custom/data/git_manager.db')
    assert settings.ssh_keys_dir == Path('/custom/data/ssh_keys')
    assert settings.repos_dir == Path('/custom/data/repos')


def test_encrypt_key_validation_invalid_base64(test_env_vars, monkeypatch):
    """测试 encrypt_key 验证：无效的 base64 字符串."""
    from app.config import Settings
    from pydantic import ValidationError

    monkeypatch.setenv("GM_ENCRYPT_KEY", "not-valid-base64!!!")

    with pytest.raises(ValidationError) as exc_info:
        Settings()

    assert 'encrypt_key' in str(exc_info.value).lower()
    assert 'base64' in str(exc_info.value).lower()


def test_encrypt_key_validation_too_short(test_env_vars, monkeypatch):
    """测试 encrypt_key 验证：解码后长度不足."""
    from app.config import Settings
    from pydantic import ValidationError

    # Only 10 bytes instead of required 32
    short_key = base64.b64encode(b'short-key-1').decode()
    monkeypatch.setenv("GM_ENCRYPT_KEY", short_key)

    with pytest.raises(ValidationError) as exc_info:
        Settings()

    assert 'encrypt_key' in str(exc_info.value).lower()
    assert '32' in str(exc_info.value).lower() or 'byte' in str(exc_info.value).lower()


def test_encrypt_key_validation_valid(test_env_vars, monkeypatch):
    """测试 encrypt_key 验证：有效的密钥."""
    from app.config import Settings

    # Valid 32-byte key
    valid_key = base64.b64encode(b'test-key-32-bytes-long-1234567890').decode()
    monkeypatch.setenv("GM_ENCRYPT_KEY", valid_key)

    settings = Settings()
    assert settings.encrypt_key == valid_key