# Storage Configuration Guide

Sharey supports multiple storage backends for maximum flexibility. You can choose between cloud storage (Backblaze B2) or local filesystem storage.

## 🔄 How to Choose Storage Type

### **Quick Method: Edit config.json**
1. Open your `config.json` file
2. Find the `"storage"` section
3. Change `"backend"` to either `"local"` or `"b2"`

```json
{
  "storage": {
    "backend": "local"    // Change this to "local" or "b2"
  }
}
```

### **Interactive Method**
```bash
python src/config_util.py set       # Interactive setup
python src/config_util.py validate  # Verify configuration  
python test_storage.py              # Test the backend
```

### **Environment Variable Method**
```bash
export STORAGE_BACKEND=local  # or "b2"
```

## 📊 Storage Backend Comparison

| Feature | **Local Storage** | **B2 Cloud Storage** |
|---------|------------------|-------------------|
| **Setup Difficulty** | ✅ Easy | ⚠️ Requires B2 account |
| **Cost** | ✅ Free | 💰 ~$0.005/GB/month |
| **Speed** | ✅ Very fast | ⚠️ Network dependent |
| **Reliability** | ⚠️ Single machine | ✅ Cloud redundancy |
| **Scalability** | ⚠️ Disk space limited | ✅ Unlimited |
| **Best for** | Development, self-hosting | Production, scaling |

## Storage Backends

### 1. Backblaze B2 (Cloud Storage)
- ✅ **Best for production deployments**
- ✅ **Scalable and reliable**
- ✅ **No local disk space requirements**
- ❌ **Requires B2 account and credentials**

### 2. Local Filesystem
- ✅ **No external dependencies**
- ✅ **Fast access**
- ✅ **No cloud costs**
- ❌ **Limited by local disk space**
- ❌ **Not suitable for distributed deployments**

## Configuration Details

## Configuration Details

### Option 1: config.json (Recommended)

```json
{
  "storage": {
    "backend": "b2",           // "b2" or "local"
    "local_path": "storage"    // Path for local storage (only used if backend is "local")
  },
  "b2": {
    "application_key_id": "your_key_id_here",
    "application_key": "your_application_key_here",
    "bucket_name": "your_bucket_name_here"
  }
}
```

### Option 2: Environment Variables

```bash
# Storage configuration
export STORAGE_BACKEND=local
export STORAGE_LOCAL_PATH=./my_storage

# B2 configuration (only needed if using B2)
export B2_APPLICATION_KEY_ID=your_key_id_here
export B2_APPLICATION_KEY=your_application_key_here
export B2_BUCKET_NAME=your_bucket_name_here
```

## 🚀 Quick Start Guide

### **For Development/Testing (Local Storage)**
```bash
# 1. Edit config.json
{
  "storage": {
    "backend": "local"
  }
}

# 2. Test it
python test_storage.py

# 3. Start the app
python run.py
```
Files will be stored in the `storage/` directory.

### **For Production (B2 Cloud Storage)**
```bash
# 1. Get B2 credentials from backblaze.com
# 2. Edit config.json
{
  "storage": {
    "backend": "b2"
  },
  "b2": {
    "application_key_id": "your_key_id",
    "application_key": "your_key",
    "bucket_name": "your_bucket"
  }
}

# 3. Test it
python test_storage.py

# 4. Start the app
python run.py
```

## Setup Examples

### Using Local Storage

1. **Edit config.json:**
```json
{
  "storage": {
    "backend": "local",
    "local_path": "storage"
  }
}
```

2. **Start the application:**
```bash
python run.py
```

The application will automatically create the `storage` directory and subdirectories as needed.

### Using Backblaze B2

1. **Create a B2 account** at [backblaze.com](https://www.backblaze.com/b2/)

2. **Create a bucket** and application key with read/write permissions

3. **Edit config.json:**
```json
{
  "storage": {
    "backend": "b2"
  },
  "b2": {
    "application_key_id": "your_actual_key_id",
    "application_key": "your_actual_key",
    "bucket_name": "your_bucket_name"
  }
}
```

4. **Start the application:**
```bash
python run.py
```

## Interactive Configuration

Use the configuration utility for easy setup:

```bash
# Configure storage interactively
python src/config_util.py set

# Validate your configuration
python src/config_util.py validate

# Show current configuration
python src/config_util.py show
```

## Testing Storage

Test your storage configuration:

```bash
# Test storage backend
python test_storage.py
```

This will:
- ✅ Initialize the storage backend
- ✅ Upload a test file
- ✅ Download and verify the file
- ✅ Test file operations (exists, size, list)
- ✅ Clean up test files

## Migration Between Backends

### From B2 to Local Storage

1. **Download your data** from B2 (optional - keep as backup)
2. **Update config.json:**
```json
{
  "storage": {
    "backend": "local",
    "local_path": "storage"
  }
}
```
3. **Restart the application**

**Note:** Existing files in B2 won't be automatically transferred. URLs will break unless you migrate the data.

### From Local to B2 Storage

1. **Set up B2 bucket and credentials**
2. **Update config.json:**
```json
{
  "storage": {
    "backend": "b2"
  },
  "b2": {
    "application_key_id": "your_key_id",
    "application_key": "your_key",
    "bucket_name": "your_bucket"
  }
}
```
3. **Restart the application**

**Migration Script (Optional):**
If you want to migrate existing local files to B2, create a simple script:

```python
#!/usr/bin/env python3
import os
from pathlib import Path
from src.storage import LocalStorageBackend, B2StorageBackend

# Initialize both backends
local = LocalStorageBackend("storage")
b2 = B2StorageBackend("key_id", "key", "bucket_name")

# Migrate files
for file_path in local.list_files():
    print(f"Migrating: {file_path}")
    content = local.download_file(file_path)
    b2.upload_file(content, file_path)
    print(f"✅ Migrated: {file_path}")
```

## Directory Structure

### Local Storage Structure
```
storage/
├── files/
│   ├── abc123.jpg
│   ├── def456.pdf
│   └── ...
└── pastes/
    ├── xyz789.txt
    ├── uvw012.txt
    └── ...
```

### B2 Storage Structure
```
bucket/
├── files/
│   ├── abc123.jpg
│   ├── def456.pdf
│   └── ...
└── pastes/
    ├── xyz789.txt
    ├── uvw012.txt
    └── ...
```

## Performance Considerations

### Local Storage
- **Pros:** Very fast access, no network latency
- **Cons:** Limited by disk I/O, single point of failure

### B2 Storage
- **Pros:** Unlimited capacity, built-in redundancy, CDN capabilities
- **Cons:** Network latency, dependent on internet connection

## Security

### Local Storage
- Files are stored with filesystem permissions
- Secure as your server's filesystem
- Access controlled by Sharey application

### B2 Storage
- Files stored with B2's encryption at rest
- Access controlled by application keys
- Private bucket - files not publicly accessible
- All access proxied through Sharey application

## Troubleshooting

### Common Issues

**"Storage backend not initialized"**
- Check your configuration syntax
- Verify credentials (for B2)
- Run `python test_storage.py`

**"B2 authentication failed"**
- Verify your application key ID and key
- Check bucket name spelling
- Ensure key has read/write permissions

**"Permission denied" (Local storage)**
- Check filesystem permissions on storage directory
- Ensure Sharey has write access to the path

**"File not found"**
- Check if storage backend was changed without migration
- Verify file was uploaded successfully

### Debug Commands

```bash
# Test storage backend
python test_storage.py

# Validate configuration
python src/config_util.py validate

# Check application logs
tail -f logs/sharey.log

# Test B2 connection (if using B2)
python tests/test_b2.py
```

## Best Practices

1. **Production:** Use B2 for scalability and reliability
2. **Development:** Local storage is fine for testing
3. **Backup:** Consider periodic backups regardless of backend
4. **Monitoring:** Monitor disk space (local) or B2 costs (cloud)
5. **Security:** Use environment variables for sensitive credentials in production

## Cost Considerations

### Local Storage
- **Cost:** Server disk space and bandwidth
- **Scaling:** Limited by hardware

### B2 Storage
- **Storage:** $0.005/GB/month
- **Download:** $0.01/GB
- **API calls:** Mostly free (10,000 free per day)
- **Scaling:** Pay as you grow

For most small to medium deployments, B2 costs are minimal (under $5/month for moderate usage).