#!/usr/bin/env python3
"""Fib verifier - generates and validates Fibonacci sequence"""

def fib(n):
    """Return nth Fibonacci number (0-indexed)"""
    a, b = 0, 1
    for _ in range(n):
        a, b = b, a + b
    return a

def main():
    results = []
    for i in range(15):
        n = fib(i)
        results.append({"n": i, "fib": n})
    
    # Verify against known values
    known = {0: 0, 1: 1, 2: 1, 3: 2, 4: 3, 5: 5, 6: 8, 7: 13, 8: 21, 9: 34, 10: 55}
    all_correct = all(r["fib"] == known.get(r["n"], fib(r["n"])) for r in results[:11])
    
    output = f"""Fibonacci Verification Report
{'=' * 40}
Sequence (first 15 terms):
{', '.join(str(r['fib']) for r in results)}
Last computed: F(14) = {results[-1]['fib']}
Validation: {'PASSED' if all_correct else 'FAILED'}
Exit code would be: {0 if all_correct else 1}
"""
    
    with open('/root/.hermes/wizard-outputs/spark/fibonacci_output.txt', 'w') as f:
        f.write(output)
    
    print(output)
    return 0 if all_correct else 1

if __name__ == "__main__":
    exit(main())