import json
from utils import now
from did import generate_keys, generate_did, get_signing_key
from templates import credential_tmpl, proof_tmpl
from sign import sign_proof


# source: https://github.com/mmlab-aueb/PyEd25519Signature2018/blob/master/signer.py

def sign(credential, key, issuer_did):
    document = json.loads(credential)
    _did = issuer_did + "#" + issuer_did.split("did:key:")[1]
    proof = proof_tmpl.copy()
    proof['verificationMethod'] = _did
    proof['created'] = now()

    sign_proof(document, proof, key)
    del proof['@context']
    document['proof'] = proof
    return document


def main():
    key = generate_keys()
    did = generate_did(key)
    signing_key = get_signing_key(key)

    credential = credential_tmpl.copy()
    credential["issuer"] = did
    credential["issuanceDate"] = now()
    cred = json.dumps(credential)

    vc = sign(cred, signing_key, did)

    print(json.dumps(vc, separators=(',', ':')))


if __name__ == "__main__":
    main()