# Incremental Backtester

A high-performance backtesting system for incremental trading strategies with multiprocessing support for parameter optimization.

## Overview

The Incremental Backtester provides a complete solution for testing incremental trading strategies:

- **IncTrader**: Manages a single strategy during backtesting
- **IncBacktester**: Orchestrates multiple traders and parameter optimization
- **Multiprocessing Support**: Parallel execution across CPU cores
- **Memory Efficient**: Bounded memory usage regardless of data length
- **Real-time Compatible**: Same interface as live trading systems

## Quick Start

### 1. Basic Single Strategy Backtest

```python
from cycles.IncStrategies import (
    IncBacktester, BacktestConfig, IncRandomStrategy
)

# Configure backtest
config = BacktestConfig(
    data_file="btc_1min_2023.csv",
    start_date="2023-01-01",
    end_date="2023-12-31",
    initial_usd=10000,
    stop_loss_pct=0.02,  # 2% stop loss
    take_profit_pct=0.05  # 5% take profit
)

# Create strategy
strategy = IncRandomStrategy(params={
    "timeframe": "15min",
    "entry_probability": 0.1,
    "exit_probability": 0.15
})

# Run backtest
backtester = IncBacktester(config)
results = backtester.run_single_strategy(strategy)

print(f"Profit: {results['profit_ratio']*100:.2f}%")
print(f"Trades: {results['n_trades']}")
print(f"Win Rate: {results['win_rate']*100:.1f}%")
```

### 2. Multiple Strategies

```python
strategies = [
    IncRandomStrategy(params={"timeframe": "15min"}),
    IncRandomStrategy(params={"timeframe": "30min"}),
    IncMetaTrendStrategy(params={"timeframe": "15min"})
]

results = backtester.run_multiple_strategies(strategies)

for result in results:
    print(f"{result['strategy_name']}: {result['profit_ratio']*100:.2f}%")
```

### 3. Parameter Optimization

```python
# Define parameter grids
strategy_param_grid = {
    "timeframe": ["15min", "30min", "1h"],
    "entry_probability": [0.05, 0.1, 0.15],
    "exit_probability": [0.1, 0.15, 0.2]
}

trader_param_grid = {
    "stop_loss_pct": [0.01, 0.02, 0.03],
    "take_profit_pct": [0.03, 0.05, 0.07]
}

# Run optimization (uses all CPU cores)
results = backtester.optimize_parameters(
    strategy_class=IncRandomStrategy,
    param_grid=strategy_param_grid,
    trader_param_grid=trader_param_grid,
    max_workers=8  # Use 8 CPU cores
)

# Get summary statistics
summary = backtester.get_summary_statistics(results)
print(f"Best profit: {summary['profit_ratio']['max']*100:.2f}%")

# Save results
backtester.save_results(results, "optimization_results.csv")
```

## Architecture

### IncTrader Class

Manages a single strategy during backtesting:

```python
trader = IncTrader(
    strategy=strategy,
    initial_usd=10000,
    params={
        "stop_loss_pct": 0.02,
        "take_profit_pct": 0.05
    }
)

# Process data sequentially
for timestamp, ohlcv_data in data_stream:
    trader.process_data_point(timestamp, ohlcv_data)

# Get results
results = trader.get_results()
```

**Key Features:**
- Position management (USD/coin balance)
- Trade execution based on strategy signals
- Stop loss and take profit handling
- Performance tracking and metrics
- Fee calculation using existing MarketFees

### IncBacktester Class

Orchestrates multiple traders and handles data loading:

```python
backtester = IncBacktester(config, storage)

# Single strategy
results = backtester.run_single_strategy(strategy)

# Multiple strategies
results = backtester.run_multiple_strategies(strategies)

# Parameter optimization
results = backtester.optimize_parameters(strategy_class, param_grid)
```

**Key Features:**
- Data loading using existing Storage class
- Multiprocessing for parameter optimization
- Result aggregation and analysis
- Summary statistics calculation
- CSV export functionality

### BacktestConfig Class

Configuration for backtesting runs:

```python
config = BacktestConfig(
    data_file="btc_1min_2023.csv",
    start_date="2023-01-01",
    end_date="2023-12-31",
    initial_usd=10000,
    timeframe="1min",
    
    # Trader parameters
    stop_loss_pct=0.02,
    take_profit_pct=0.05,
    
    # Performance settings
    max_workers=None,  # Auto-detect CPU cores
    chunk_size=1000
)
```

## Data Requirements

### Input Data Format

The backtester expects minute-level OHLCV data in CSV format:

```csv
timestamp,open,high,low,close,volume
1672531200,16625.1,16634.5,16620.0,16628.3,125.45
1672531260,16628.3,16635.2,16625.8,16631.7,98.32
...
```

**Requirements:**
- Timestamp column (Unix timestamp or datetime)
- OHLCV columns: open, high, low, close, volume
- Minute-level frequency (strategies handle timeframe aggregation)
- Sorted by timestamp (ascending)

### Data Loading

Uses the existing Storage class for data loading:

```python
from cycles.utils.storage import Storage

storage = Storage()
data = storage.load_data(
    "btc_1min_2023.csv",
    "2023-01-01",
    "2023-12-31"
)
```

## Performance Features

### Multiprocessing Support

Parameter optimization automatically distributes work across CPU cores:

```python
# Automatic CPU detection
results = backtester.optimize_parameters(strategy_class, param_grid)

# Manual worker count
results = backtester.optimize_parameters(
    strategy_class, param_grid, max_workers=4
)

# Single-threaded (for debugging)
results = backtester.optimize_parameters(
    strategy_class, param_grid, max_workers=1
)
```

### Memory Efficiency

- **Bounded Memory**: Strategy buffers have fixed size limits
- **Incremental Processing**: No need to load entire datasets into memory
- **Efficient Data Structures**: Optimized for sequential processing

### Performance Monitoring

Built-in performance tracking:

```python
results = backtester.run_single_strategy(strategy)

print(f"Backtest duration: {results['backtest_duration_seconds']:.2f}s")
print(f"Data points processed: {results['data_points_processed']}")
print(f"Processing rate: {results['data_points']/results['backtest_duration_seconds']:.0f} points/sec")
```

## Result Analysis

### Individual Results

Each backtest returns comprehensive metrics:

```python
{
    "strategy_name": "IncRandomStrategy",
    "strategy_params": {"timeframe": "15min", ...},
    "trader_params": {"stop_loss_pct": 0.02, ...},
    "initial_usd": 10000.0,
    "final_usd": 10250.0,
    "profit_ratio": 0.025,
    "n_trades": 15,
    "win_rate": 0.6,
    "max_drawdown": 0.08,
    "avg_trade": 0.0167,
    "total_fees_usd": 45.32,
    "trades": [...],  # Individual trade records
    "backtest_duration_seconds": 2.45
}
```

### Summary Statistics

For parameter optimization runs:

```python
summary = backtester.get_summary_statistics(results)

{
    "total_runs": 108,
    "successful_runs": 105,
    "failed_runs": 3,
    "profit_ratio": {
        "mean": 0.023,
        "std": 0.045,
        "min": -0.12,
        "max": 0.18,
        "median": 0.019
    },
    "best_run": {...},
    "worst_run": {...}
}
```

### Export Results

Save results to CSV for further analysis:

```python
backtester.save_results(results, "backtest_results.csv")
```

Output includes:
- Strategy and trader parameters
- Performance metrics
- Trade statistics
- Execution timing

## Integration with Existing System

### Compatibility

The incremental backtester integrates seamlessly with existing components:

- **Storage Class**: Uses existing data loading infrastructure
- **MarketFees**: Uses existing fee calculation
- **Strategy Interface**: Compatible with incremental strategies
- **Result Format**: Similar to existing Backtest class

### Migration from Original Backtester

```python
# Original backtester
from cycles.backtest import Backtest

# Incremental backtester
from cycles.IncStrategies import IncBacktester, BacktestConfig

# Similar interface, enhanced capabilities
config = BacktestConfig(...)
backtester = IncBacktester(config)
results = backtester.run_single_strategy(strategy)
```

## Testing

### Synthetic Data Testing

Test with synthetic data before using real market data:

```python
from cycles.IncStrategies.test_inc_backtester import main

# Run all tests
main()
```

### Unit Tests

Individual component testing:

```python
# Test IncTrader
from cycles.IncStrategies.test_inc_backtester import test_inc_trader
test_inc_trader()

# Test IncBacktester
from cycles.IncStrategies.test_inc_backtester import test_inc_backtester
test_inc_backtester()
```

## Examples

See `example_backtest.py` for comprehensive usage examples:

```python
from cycles.IncStrategies.example_backtest import (
    example_single_strategy_backtest,
    example_parameter_optimization,
    example_custom_analysis
)

# Run examples
example_single_strategy_backtest()
example_parameter_optimization()
```

## Best Practices

### 1. Data Preparation

- Ensure data quality (no gaps, correct format)
- Use appropriate date ranges for testing
- Consider market conditions in test periods

### 2. Parameter Optimization

- Start with small parameter grids for testing
- Use representative time periods
- Consider overfitting risks
- Validate results on out-of-sample data

### 3. Performance Optimization

- Use multiprocessing for large parameter grids
- Monitor memory usage for long backtests
- Profile bottlenecks for optimization

### 4. Result Validation

- Compare with original backtester for validation
- Check trade logic manually for small samples
- Verify fee calculations and position management

## Troubleshooting

### Common Issues

1. **Data Loading Errors**
   - Check file path and format
   - Verify date range availability
   - Ensure required columns exist

2. **Strategy Errors**
   - Check strategy initialization
   - Verify parameter validity
   - Monitor warmup period completion

3. **Performance Issues**
   - Reduce parameter grid size
   - Limit worker count for memory constraints
   - Use shorter time periods for testing

### Debug Mode

Enable detailed logging:

```python
import logging
logging.basicConfig(level=logging.DEBUG)

# Run with detailed output
results = backtester.run_single_strategy(strategy)
```

### Memory Monitoring

Monitor memory usage during optimization:

```python
import psutil
import os

process = psutil.Process(os.getpid())
print(f"Memory usage: {process.memory_info().rss / 1024 / 1024:.1f} MB")
```

## Future Enhancements

- **Live Trading Integration**: Direct connection to trading systems
- **Advanced Analytics**: Risk metrics, Sharpe ratio, etc.
- **Visualization**: Built-in plotting and analysis tools
- **Database Support**: Direct database connectivity
- **Strategy Combinations**: Multi-strategy portfolio testing

## Support

For issues and questions:
1. Check the test scripts for working examples
2. Review the TODO.md for known limitations
3. Examine the base strategy implementations
4. Use debug logging for detailed troubleshooting