# Banks2FF

A robust command-line tool to synchronize bank transactions from GoCardless (formerly Nordigen) to Firefly III.

## ✨ Key Benefits

- **Automatic Transaction Sync**: Keep your Firefly III finances up-to-date with your bank accounts
- **Intelligent Caching**: Reduces GoCardless API calls by up to 99% through encrypted local storage
- **Multi-Currency Support**: Handles international transactions and foreign currencies correctly
- **Smart Duplicate Detection**: Avoids double-counting transactions automatically
- **Reliable Operation**: Continues working even when some accounts need attention
- **Safe Preview Mode**: Test changes before applying them to your finances
- **Rate Limit Aware**: Works within API limits to ensure consistent access

## 🚀 Quick Start

### Prerequisites
- Rust (latest stable)
- GoCardless Bank Account Data account
- Running Firefly III instance

### Setup
1. Copy environment template: `cp env.example .env`
2. Fill in your credentials in `.env`:
    - `GOCARDLESS_ID`: Your GoCardless Secret ID
    - `GOCARDLESS_KEY`: Your GoCardless Secret Key
    - `FIREFLY_III_URL`: Your Firefly instance URL
    - `FIREFLY_III_API_KEY`: Your Personal Access Token
    - `BANKS2FF_CACHE_KEY`: Required encryption key for secure transaction caching

### Usage
```bash
# Sync all accounts (automatic date range)
cargo run -p banks2ff

# Preview changes without saving
cargo run -p banks2ff -- --dry-run

# Sync specific date range
cargo run -p banks2ff -- --start 2023-01-01 --end 2023-01-31
```

## 📋 What It Does

Banks2FF automatically:
1. Connects to your bank accounts via GoCardless
2. Finds matching accounts in your Firefly III instance
3. Downloads new transactions since your last sync
4. Adds them to Firefly III (avoiding duplicates)
5. Handles errors gracefully - keeps working even if some accounts have issues

## 🔐 Secure Transaction Caching

Banks2FF automatically caches your transaction data to make future syncs much faster:

- **Faster Syncs**: Reuses previously downloaded data instead of re-fetching from the bank
- **API Efficiency**: Dramatically reduces the number of calls made to GoCardless
- **Secure Storage**: Your financial data is safely encrypted on your local machine
- **Automatic Management**: The cache works transparently in the background

The cache requires `BANKS2FF_CACHE_KEY` to be set in your `.env` file for secure encryption (see `env.example` for key generation instructions).

## 🔧 Troubleshooting

- **Account not syncing?** Check that the IBAN matches between GoCardless and Firefly III
- **Missing transactions?** The tool syncs from the last transaction date forward
- **Rate limited?** The tool automatically handles API limits and retries appropriately

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*For technical details, see [docs/architecture.md](docs/architecture.md)*