first pass at gdrive integration

Signed-off-by: Derek Anderson <dmikey@users.noreply.github.com>

fix and correct gdrive

Signed-off-by: Derek Anderson <dmikey@users.noreply.github.com>

remove old doc

Signed-off-by: Derek Anderson <dmikey@users.noreply.github.com>

proper pytest tests

Signed-off-by: Derek Anderson <dmikey@users.noreply.github.com>

Author: dmikey

experimental/docs/gdrive_backend_setup.md

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+# Google Drive Backend Setup Guide
+
+This guide will help you set up and use the Google Drive backend for Ragas datasets.
+
+## Prerequisites
+
+### 1. Install Dependencies
+
+```bash
+pip install google-api-python-client google-auth google-auth-oauthlib
+```
+
+### 2. Set up Google Cloud Project
+
+1. Go to the [Google Cloud Console](https://console.cloud.google.com/)
+2. Create a new project or select an existing one
+3. Enable the following APIs:
+   - Google Drive API
+   - Google Sheets API
+
+### 3. Create Credentials
+
+You have two options for authentication:
+
+#### Option A: OAuth 2.0 (Recommended for development)
+
+1. In Google Cloud Console, go to "Credentials"
+2. Click "Create Credentials" → "OAuth client ID"
+3. Choose "Desktop application"
+4. Download the JSON file
+5. Save it securely (e.g., as `credentials.json`)
+
+#### Option B: Service Account (Recommended for production)
+
+1. In Google Cloud Console, go to "Credentials"
+2. Click "Create Credentials" → "Service account"
+3. Fill in the details and create the account
+4. Generate a key (JSON format)
+5. Download and save the JSON file securely
+6. Share your Google Drive folder with the service account email
+
+## Setup Instructions
+
+### 1. Create a Google Drive Folder
+
+1. Create a folder in Google Drive where you want to store your datasets
+2. Get the folder ID from the URL:
+   ```
+   https://drive.google.com/drive/folders/FOLDER_ID_HERE
+   ```
+3. If using a service account, share this folder with the service account email
+
+### 2. Set Environment Variables (Optional)
+
+```bash
+export GDRIVE_FOLDER_ID="your_folder_id_here"
+export GDRIVE_CREDENTIALS_PATH="path/to/credentials.json"
+# OR for service account:
+export GDRIVE_SERVICE_ACCOUNT_PATH="path/to/service_account.json"
+```
+
+### 3. Basic Usage
+
+```python
+from ragas_experimental.project.core import Project
+from pydantic import BaseModel
+
+# Define your data model
+class EvaluationEntry(BaseModel):
+    question: str
+    answer: str
+    score: float
+
+# Create project with Google Drive backend
+project = Project.create(
+    name="my_project",
+    backend="gdrive",
+    gdrive_folder_id="your_folder_id_here",
+    gdrive_credentials_path="path/to/credentials.json"  # OAuth
+    # OR
+    # gdrive_service_account_path="path/to/service_account.json"  # Service Account
+)
+
+# Create a dataset
+dataset = project.create_dataset(
+    model=EvaluationEntry,
+    name="my_dataset"
+)
+
+# Add data
+entry = EvaluationEntry(
+    question="What is AI?",
+    answer="Artificial Intelligence",
+    score=0.95
+)
+dataset.append(entry)
+
+# Load and access data
+dataset.load()
+print(f"Dataset has {len(dataset)} entries")
+for entry in dataset:
+    print(f"{entry.question} -> {entry.answer}")
+```
+
+## File Structure
+
+When you use the Google Drive backend, it creates the following structure:
+
+```
+Your Google Drive Folder/
+├── project_name/
+│   ├── datasets/
+│   │   ├── dataset1.gsheet
+│   │   └── dataset2.gsheet
+│   └── experiments/
+│       └── experiment1.gsheet
+```
+
+Each dataset is stored as a Google Sheet with:
+- Column headers matching your model fields
+- An additional `_row_id` column for internal tracking
+- Automatic type conversion when loading data
+
+## Authentication Flow
+
+### OAuth (First Time)
+1. When you first run your code, a browser window will open
+2. Sign in to your Google account
+3. Grant permissions to access Google Drive
+4. A `token.json` file will be created automatically
+5. Subsequent runs will use this token (no browser needed)
+
+### Service Account
+1. No interactive authentication required
+2. Make sure the service account has access to your folder
+3. The JSON key file is used directly
+
+## Troubleshooting
+
+### Common Issues
+
+1. **"Folder not found" error**
+   - Check that the folder ID is correct
+   - Ensure the folder is shared with your service account (if using one)
+
+2. **Authentication errors**
+   - Verify your credentials file path
+   - Check that the required APIs are enabled
+   - For OAuth: Delete `token.json` and re-authenticate
+
+3. **Permission errors**
+   - Make sure your account has edit access to the folder
+   - For service accounts: share the folder with the service account email
+
+4. **Import errors**
+   - Install required dependencies: `pip install google-api-python-client google-auth google-auth-oauthlib`
+
+### Getting Help
+
+If you encounter issues:
+1. Check the error message carefully
+2. Verify your Google Cloud setup
+3. Test authentication with a simple Google Drive API call
+4. Check that all dependencies are installed
+
+## Security Best Practices
+
+1. **Never commit credentials to version control**
+2. **Use environment variables for sensitive information**
+3. **Limit service account permissions to minimum required**
+4. **Regularly rotate service account keys**
+5. **Use OAuth for development, service accounts for production**
+
+## Advanced Configuration
+
+### Custom Authentication Paths
+
+```python
+project = Project.create(
+    name="my_project",
+    backend="gdrive",
+    gdrive_folder_id="folder_id",
+    gdrive_credentials_path="/custom/path/to/credentials.json",
+    gdrive_token_path="/custom/path/to/token.json"
+)
+```
+
+### Multiple Projects
+
+You can have multiple projects in the same Google Drive folder:
+
+```python
+project1 = Project.create(name="project1", backend="gdrive", ...)
+project2 = Project.create(name="project2", backend="gdrive", ...)
+```
+
+Each will create its own subfolder structure.

experimental/examples/gdrive_backend_example.py

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+"""
+Example usage of the Google Drive backend for Ragas.
+
+This example shows how to:
+1. Set up authentication for Google Drive
+2. Create a project with Google Drive backend
+3. Create and manage datasets stored in Google Sheets
+
+Prerequisites:
+1. Install required dependencies:
+   pip install google-api-python-client google-auth google-auth-oauthlib
+
+2. Set up Google Drive API credentials:
+   - Go to Google Cloud Console
+   - Enable Google Drive API and Google Sheets API
+   - Create credentials (either OAuth or Service Account)
+   - Download the JSON file
+
+3. Set environment variables or provide paths directly
+"""
+
+import os
+from pydantic import BaseModel
+from ragas_experimental.project.core import Project
+from ragas_experimental.metric import MetricResult
+
+
+# Example model for our dataset
+class EvaluationEntry(BaseModel):
+    question: str
+    answer: str
+    context: str
+    score: float
+    feedback: str
+
+
+def example_oauth_setup():
+    """Example using OAuth authentication."""
+    
+    # Set up environment variables (or pass directly to Project.create)
+    # os.environ["GDRIVE_FOLDER_ID"] = "your_google_drive_folder_id_here"
+    # os.environ["GDRIVE_CREDENTIALS_PATH"] = "path/to/your/credentials.json"
+    
+    # Create project with Google Drive backend
+    project = Project.create(
+        name="my_ragas_project",
+        description="A project using Google Drive for storage",
+        backend="gdrive",
+        gdrive_folder_id="1HLvvtKLnwGWKTely0YDlJ397XPTQ77Yg",
+        gdrive_credentials_path="/Users/derekanderson/Downloads/credentials.json",
+        gdrive_token_path="token.json"  # Will be created automatically
+    )
+    
+    return project
+
+
+def example_usage():
+    """Example of using the Google Drive backend."""
+    
+    # Create a project (choose one of the authentication methods above)
+    project = example_oauth_setup()  # or example_service_account_setup()
+    
+    # Create a dataset
+    dataset = project.create_dataset(
+        model=EvaluationEntry,
+        name="evaluation_results"
+    )
+    
+    # Add some entries
+    entry1 = EvaluationEntry(
+        question="What is the capital of France?",
+        answer="Paris",
+        context="France is a country in Europe.",
+        score=0.95,
+        feedback="Correct answer"
+    )
+    
+    entry2 = EvaluationEntry(
+        question="What is 2+2?",
+        answer="4",
+        context="Basic arithmetic question.",
+        score=1.0,
+        feedback="Perfect answer"
+    )
+    
+    # Append entries to the dataset
+    dataset.append(entry1)
+    dataset.append(entry2)
+    
+    # Load all entries
+    dataset.load()
+    print(f"Dataset contains {len(dataset)} entries")
+    
+    # Access entries
+    for i, entry in enumerate(dataset):
+        print(f"Entry {i}: {entry.question} -> {entry.answer} (Score: {entry.score})")
+    
+    # Update an entry
+    dataset[0].score = 0.98
+    dataset[0].feedback = "Updated feedback"
+    dataset[0] = dataset[0]  # Trigger update
+    
+    # Search for entries
+    entry = dataset._backend.get_entry_by_field("question", "What is 2+2?", EvaluationEntry)
+    if entry:
+        print(f"Found entry: {entry.answer}")
+    
+    return dataset
+
+
+if __name__ == "__main__":
+    # Run the example
+    try:
+        dataset = example_usage()
+        print("Google Drive backend example completed successfully!")
+    except Exception as e:
+        print(f"Error: {e}")
+        print("\nMake sure to:")
+        print("1. Install required dependencies")
+        print("2. Set up Google Drive API credentials")
+        print("3. Update the folder ID and credential paths in this example")

experimental/ragas_experimental/backends/__init__.py

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+# Optional imports for backends that require additional dependencies
+
+# Always available backends
+from .ragas_api_client import RagasApiClient
+from .factory import RagasApiClientFactory
+
+# Conditionally import Google Drive backend
+try:
+    from .gdrive_backend import GDriveBackend
+    __all__ = ["RagasApiClient", "RagasApiClientFactory", "GDriveBackend"]
+except ImportError:
+    __all__ = ["RagasApiClient", "RagasApiClientFactory"]
+
+# Conditionally import Notion backend if available
+try:
+    from .notion_backend import NotionBackend
+    __all__.append("NotionBackend")
+except ImportError:
+    pass

experimental/ragas_experimental/backends/base.py

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+"""Base classes for dataset backends."""
+
+from abc import ABC, abstractmethod
+import typing as t
+
+
+class DatasetBackend(ABC):
+    """Abstract base class for dataset backends.
+
+    All dataset storage backends must implement these methods.
+    """
+
+    @abstractmethod
+    def initialize(self, dataset):
+        """Initialize the backend with dataset information"""
+        pass
+
+    @abstractmethod
+    def get_column_mapping(self, model):
+        """Get mapping between model fields and backend columns"""
+        pass
+
+    @abstractmethod
+    def load_entries(self, model_class):
+        """Load all entries from storage"""
+        pass
+
+    @abstractmethod
+    def append_entry(self, entry):
+        """Add a new entry to storage and return its ID"""
+        pass
+
+    @abstractmethod
+    def update_entry(self, entry):
+        """Update an existing entry in storage"""
+        pass
+
+    @abstractmethod
+    def delete_entry(self, entry_id):
+        """Delete an entry from storage"""
+        pass
+
+    @abstractmethod
+    def get_entry_by_field(self, field_name: str, field_value: t.Any, model_class):
+        """Get an entry by field value"""
+        pass