import math

def calculate_weight_metrics(base_hex, witness_hex=""):
    # base_hex: The part of the transaction without the witness
    # witness_hex: The witness data (markers, flags, stacks)

    # 1. Calculate Stripped Size
    stripped_size = len(base_hex) // 2

    # 2. Calculate Witness Size
    # Note: In a real TX, markers (00) and flags (01) are witness data
    witness_size = len(witness_hex) // 2

    # 3. Calculate Total (Raw) Size
    total_size = stripped_size + witness_size

    # 4. Calculate Weight
    # (Stripped * 4) + (Witness * 1)
    weight = (stripped_size * 4) + (witness_size * 1)

    # 5. Calculate vSize
    # Weight divided by 4, rounded up
    vsize = math.ceil(weight / 4)

    print(f"--- Transaction Size Audit ---")
    print(f"[*] Stripped Size: {stripped_size} bytes")
    print(f"[*] Witness Size:  {witness_size} bytes")
    print(f"[*] Total Raw Size: {total_size} bytes")
    print(f"------------------------------")
    print(f"[*] Total Weight:   {weight} WU")
    print(f"[*] Virtual Size:   {vsize} vBytes")

    # Efficiency Gain
    savings = (1 - (vsize / total_size)) * 100
    print(f"[*] SegWit Savings: {savings:.1f}% vs Legacy")

# --- Simulation ---

# A typical P2WPKH Transaction:
# Base part (version, inputs, outputs, locktime) ~ 110 bytes
# Witness part (marker, flag, signatures) ~ 110 bytes
base_data = "01" * 110
witness_data = "ff" * 110

calculate_weight_metrics(base_data, witness_data)