#!/usr/bin/env python3
"""Calculate Fibonacci sequence and save to file."""
import os

def fibonacci(n):
    """Return first n Fibonacci numbers."""
    if n <= 0:
        return []
    if n == 1:
        return [0]
    if n == 2:
        return [0, 1]
    fib = [0, 1]
    for i in range(2, n):
        fib.append(fib[-1] + fib[-2])
    return fib

if __name__ == '__main__':
    os.makedirs('/root/.hermes/wizard-outputs/spark', exist_ok=True)
    # Calculate first 20 Fibonacci numbers
    result = fibonacci(20)
    
    # Write to output file
    with open('/root/.hermes/wizard-outputs/spark/fibonacci.txt', 'w') as f:
        f.write("First 20 Fibonacci numbers:\n")
        for i, val in enumerate(result):
            f.write(f"F({i}) = {val}\n")
    
    print(f"Generated {len(result)} Fibonacci numbers")
    print(f"Last number: F(19) = {result[-1]}")