"""Compare event-c and event-d (same N_samples) to find header vs data bytes."""
import sys
sys.path.insert(0, ".")
from analysis.load_bundle import load_bundle


def main():
    bc = load_bundle("event-c")
    bd = load_bundle("event-d")

    # Compare prefixes
    nc, nd = len(bc.body), len(bd.body)
    n = min(nc, nd)
    diffs = []
    for i in range(n):
        if bc.body[i] != bd.body[i]:
            diffs.append(i)
    print(f"event-c body={nc}, event-d body={nd}")
    print(f"Total diffs (first {n}): {len(diffs)}")

    # Show common prefix
    same_prefix = 0
    for i in range(n):
        if bc.body[i] == bd.body[i]:
            same_prefix += 1
        else:
            break
    print(f"Common prefix length: {same_prefix}")
    print(f"event-c prefix: {bc.body[:same_prefix].hex(' ')}")

    # Look for runs of common bytes
    print(f"\nFirst 32 diff positions: {diffs[:32]}")

    # Show the "diff fingerprint" of the first 100 bytes
    print(f"\n  pos    c     d")
    for i in range(0, 100):
        marker = " " if bc.body[i] == bd.body[i] else "*"
        bd_b = bd.body[i] if i < nd else None
        print(f"  {i:>3}  {bc.body[i]:02x}{marker}  {bd_b:02x}" if bd_b is not None else f"  {i:>3}  {bc.body[i]:02x}{marker}")

if __name__ == "__main__":
    main()