import pytest
from unittest.mock import patch, MagicMock
from src.services.http_service import HTTPService, DEBUG_DATA

@pytest.fixture
def http_service():
    config = {
        'http': {
            'server_url': 'http://api.example.com',
            'endpoint': 'cells',
            'username': 'testuser',
            'password': 'testpass',
            'debug': False
        }
    }
    return HTTPService(config)

@pytest.fixture
def mock_response():
    mock = MagicMock()
    mock.status_code = 200
    mock.json.return_value = {
        "id": 1234,
        "cell_type": {
            "id": 16,
            "name": "INR18650-35E",
            "manufacturer": "Samsung",
            "capacity": 3450,
            "nominal_voltage": 3.7,
            "max_voltage": 4.2,
            "min_voltage": 2.5
        }
    }
    return mock

def test_successful_fetch(http_service, mock_response):
    # Arrange
    with patch('requests.get', return_value=mock_response) as mock_get:
        # Act
        result = http_service.fetch_cell_info(1234)

        # Assert
        mock_get.assert_called_once_with(
            'http://api.example.com/cells/1234/',
            auth=('testuser', 'testpass'),
            headers={"Accept": "application/json"}
        )
        assert result['id'] == 1234
        assert result['cell_type']['name'] == 'INR18650-35E'

def test_failed_fetch(http_service):
    # Arrange
    mock_error_response = MagicMock()
    mock_error_response.status_code = 404

    with patch('requests.get', return_value=mock_error_response) as mock_get:
        # Act & Assert
        with pytest.raises(ConnectionError) as exc_info:
            http_service.fetch_cell_info(9999)
        
        assert "could not be retreived: 404" in str(exc_info.value)

def test_debug_mode():
    # Arrange
    config = {
        'http': {
            'server_url': 'http://api.example.com',
            'debug': True
        }
    }
    service = HTTPService(config)

    # Act
    result = service.fetch_cell_info(1234)

    # Assert
    assert result == DEBUG_DATA
    assert result['cell_type']['name'] == 'INR18650-35E'
    assert result['cell_type']['capacity'] == 3450

def test_network_error(http_service):
    # Arrange
    with patch('requests.get', side_effect=ConnectionError('Network error')):
        # Act & Assert
        with pytest.raises(ConnectionError) as exc_info:
            http_service.fetch_cell_info(1234)
        
        assert "Network error" in str(exc_info.value)

def test_malformed_json(http_service):
    # Arrange
    mock_bad_response = MagicMock()
    mock_bad_response.status_code = 200
    mock_bad_response.json.side_effect = ValueError('Invalid JSON')

    with patch('requests.get', return_value=mock_bad_response):
        # Act & Assert
        with pytest.raises(ValueError) as exc_info:
            http_service.fetch_cell_info(1234)
        
        assert "Invalid JSON" in str(exc_info.value)