import streamlit as st, hashlib, time
from eip712_backend import EIP712Signer

st.sidebar.header("EIP-712 On-Chain Anchor")
CONTRACT_ADDRESS = st.sidebar.text_input("Ledger Address", "0x1234567890123456789012345678901234567890")
CHAIN_ID = st.sidebar.number_input("Chain ID", value=1, step=1)
SIGNER_KEY = st.sidebar.text_input("Signer Key", type="password")

if st.sidebar.button("Sign EIP-712 Anchor"):
    if not SIGNER_KEY or not CONTRACT_ADDRESS:
        st.error("Missing configuration.")
    else:
        root = hashlib.sha256(b"hardened_audit_log_data").hexdigest()
        signer = EIP712Signer(private_key=SIGNER_KEY, contract_address=CONTRACT_ADDRESS, chain_id=CHAIN_ID)
        payload = signer.sign_audit_receipt("a1b2c3d4-e5f6-47a8-8901-23456789abcd", root, 1024, int(time.time()))
        st.success("Signed")
        st.json(payload)