#!/usr/bin/env python3
# Copyright (c) 2015-2020 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test transaction signing using the signrawtransactionwithwallet RPC."""

from test_framework.address import script_to_p2sh
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import assert_equal, assert_raises_rpc_error, find_vout_for_address
from test_framework.script import CScript, OP_CHECKSEQUENCEVERIFY, OP_CHECKLOCKTIMEVERIFY, OP_DROP, OP_TRUE

from decimal import Decimal, getcontext

class SignRawTransactionWithWalletTest(BitcoinTestFramework):
    def add_options(self, parser):
        self.add_wallet_options(parser)

    def set_test_params(self):
        self.setup_clean_chain = True
        self.num_nodes = 1

    def skip_test_if_missing_module(self):
        self.skip_if_no_wallet()

    def test_with_lock_outputs(self):
        self.log.info("Test correct error reporting when trying to sign a locked output")
        self.nodes[0].encryptwallet("password")

        rawTx = '020000000156b958f78e3f24e0b2f4e4db1255426b0902027cb37e3ddadb52e37c3557dddb0000000000ffffffff01c0a6b929010000001600149a2ee8c77140a053f36018ac8124a6ececc1668a00000000'

        assert_raises_rpc_error(-13, "Please enter the wallet passphrase with walletpassphrase first", self.nodes[0].signrawtransactionwithwallet, rawTx)

    def script_verification_error_test(self):
        """Create and sign a raw transaction with valid (vin 0), invalid (vin 1) and one missing (vin 2) input script.

        Expected results:

        3) The transaction has no complete set of signatures
        4) Two script verification errors occurred
        5) Script verification errors have certain properties ("txid", "vout", "scriptSig", "sequence", "error")
        6) The verification errors refer to the invalid (vin 1) and missing input (vin 2)"""
        self.log.info("Test script verification errors")
        privKeys = ['cUeKHd5orzT3mz8P9pxyREHfsWtVfgsfDjiZZBcjUBAaGk1BTj7N']

        inputs = [
            # Valid pay-to-pubkey script
            {'txid': '9b907ef1e3c26fc71fe4a4b3580bc75264112f95050014157059c736f0202e71', 'vout': 0},
            # Invalid script
            {'txid': '5b8673686910442c644b1f4993d8f7753c7c8fcb5c87ee40d56eaeef25204547', 'vout': 7},
            # Missing scriptPubKey
            {'txid': '9b907ef1e3c26fc71fe4a4b3580bc75264112f95050014157059c736f0202e71', 'vout': 1},
        ]

        scripts = [
            # Valid pay-to-pubkey script
            {'txid': '9b907ef1e3c26fc71fe4a4b3580bc75264112f95050014157059c736f0202e71', 'vout': 0,
             'scriptPubKey': '76a91460baa0f494b38ce3c940dea67f3804dc52d1fb9488ac'},
            # Invalid script
            {'txid': '5b8673686910442c644b1f4993d8f7753c7c8fcb5c87ee40d56eaeef25204547', 'vout': 7,
             'scriptPubKey': 'badbadbadbad'}
        ]

        outputs = {'ycwedq2f3sz2Yf9JqZsBCQPxp18WU3Hp4J': 0.1}

        rawTx = self.nodes[0].createrawtransaction(inputs, outputs)

        # Make sure decoderawtransaction is at least marginally sane
        decodedRawTx = self.nodes[0].decoderawtransaction(rawTx)
        for i, inp in enumerate(inputs):
            assert_equal(decodedRawTx["vin"][i]["txid"], inp["txid"])
            assert_equal(decodedRawTx["vin"][i]["vout"], inp["vout"])

        # Make sure decoderawtransaction throws if there is extra data
        assert_raises_rpc_error(-22, "TX decode failed", self.nodes[0].decoderawtransaction, rawTx + "00")

        rawTxSigned = self.nodes[0].signrawtransactionwithkey(rawTx, privKeys, scripts)

        # 3) The transaction has no complete set of signatures
        assert not rawTxSigned['complete']

        # 4) Two script verification errors occurred
        assert 'errors' in rawTxSigned
        assert_equal(len(rawTxSigned['errors']), 2)

        # 5) Script verification errors have certain properties
        assert 'txid' in rawTxSigned['errors'][0]
        assert 'vout' in rawTxSigned['errors'][0]
        assert 'scriptSig' in rawTxSigned['errors'][0]
        assert 'sequence' in rawTxSigned['errors'][0]
        assert 'error' in rawTxSigned['errors'][0]

        # 6) The verification errors refer to the invalid (vin 1) and missing input (vin 2)
        assert_equal(rawTxSigned['errors'][0]['txid'], inputs[1]['txid'])
        assert_equal(rawTxSigned['errors'][0]['vout'], inputs[1]['vout'])
        assert_equal(rawTxSigned['errors'][1]['txid'], inputs[2]['txid'])
        assert_equal(rawTxSigned['errors'][1]['vout'], inputs[2]['vout'])

    def test_fully_signed_tx(self):
        self.log.info("Test signing a fully signed transaction does nothing")
        self.nodes[0].walletpassphrase("password", 9999)
        self.generate(self.nodes[0], 101)
        rawtx = self.nodes[0].createrawtransaction([], [{self.nodes[0].getnewaddress(): 10}])
        fundedtx = self.nodes[0].fundrawtransaction(rawtx)
        signedtx = self.nodes[0].signrawtransactionwithwallet(fundedtx["hex"])
        assert_equal(signedtx["complete"], True)
        signedtx2 = self.nodes[0].signrawtransactionwithwallet(signedtx["hex"])
        assert_equal(signedtx2["complete"], True)
        assert_equal(signedtx["hex"], signedtx2["hex"])
        self.nodes[0].walletlock()

    def OP_1NEGATE_test(self):
        self.log.info("Test OP_1NEGATE (0x4f) satisfies BIP62 minimal push standardness rule")
        hex_str = (
            "0200000001FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
            "FFFFFFFF00000000044F024F9CFDFFFFFF01F0B9F5050000000023210277777777"
            "77777777777777777777777777777777777777777777777777777777AC66030000"
        )
        prev_txs = [
            {
                "txid": "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
                "vout": 0,
                "scriptPubKey": "A914AE44AB6E9AA0B71F1CD2B453B69340E9BFBAEF6087",
                "redeemScript": "4F9C",
                "amount": 1,
            }
        ]
        txn = self.nodes[0].signrawtransactionwithwallet(hex_str, prev_txs)
        assert txn["complete"]

    def test_signing_with_csv(self):
        self.log.info("Test signing a transaction containing a fully signed CSV input")
        self.nodes[0].walletpassphrase("password", 9999)
        getcontext().prec = 8

        # Make sure CSV is active
        assert self.nodes[0].getblockchaininfo()['softforks']['csv']['active']

        # Create a P2SH script with CSV
        script = CScript([1, OP_CHECKSEQUENCEVERIFY, OP_DROP, OP_TRUE])
        address = script_to_p2sh(script)

        # Fund that address and make the spend
        txid = self.nodes[0].sendtoaddress(address, 1)
        vout = find_vout_for_address(self.nodes[0], txid, address)
        self.generate(self.nodes[0], 1)
        utxo = self.nodes[0].listunspent()[0]
        amt = Decimal(1) + utxo["amount"] - Decimal(0.00001)
        tx = self.nodes[0].createrawtransaction(
            [{"txid": txid, "vout": vout, "sequence": 1},{"txid": utxo["txid"], "vout": utxo["vout"]}],
            [{self.nodes[0].getnewaddress(): amt}],
            self.nodes[0].getblockcount()
        )

        # Sign and send the transaction
        self.nodes[0].importaddress(script.hex(), p2sh=True)
        signed = self.nodes[0].signrawtransactionwithwallet(tx)
        assert_equal(signed["complete"], True)
        self.nodes[0].sendrawtransaction(signed["hex"])

    def test_signing_with_cltv(self):
        self.log.info("Test signing a transaction containing a fully signed CLTV input")
        self.nodes[0].walletpassphrase("password", 9999)
        getcontext().prec = 8

        # Make sure CLTV is active
        assert self.nodes[0].getblockchaininfo()['softforks']['bip65']['active']

        # Create a P2SH script with CLTV
        script = CScript([100, OP_CHECKLOCKTIMEVERIFY, OP_DROP, OP_TRUE])
        address = script_to_p2sh(script)

        # Fund that address and make the spend
        txid = self.nodes[0].sendtoaddress(address, 1)
        vout = find_vout_for_address(self.nodes[0], txid, address)
        self.generate(self.nodes[0], 1)
        utxo = self.nodes[0].listunspent()[0]
        amt = Decimal(1) + utxo["amount"] - Decimal(0.00001)
        tx = self.nodes[0].createrawtransaction(
            [{"txid": txid, "vout": vout},{"txid": utxo["txid"], "vout": utxo["vout"]}],
            [{self.nodes[0].getnewaddress(): amt}],
            self.nodes[0].getblockcount()
        )

        # Sign and send the transaction
        self.nodes[0].importaddress(script.hex(), p2sh=True)
        signed = self.nodes[0].signrawtransactionwithwallet(tx)
        assert_equal(signed["complete"], True)
        self.nodes[0].sendrawtransaction(signed["hex"])

    def test_signing_with_missing_prevtx_info(self):
        self.nodes[0].walletpassphrase("password", 9999)
        txid = "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000"
        for type in ["legacy"]:
            self.log.info(f"Test signing with missing prevtx info ({type})")
            addr = self.nodes[0].getnewaddress("")
            addrinfo = self.nodes[0].getaddressinfo(addr)
            pubkey = addrinfo["scriptPubKey"]
            inputs = [{'txid': txid, 'vout': 3, 'sequence': 1000}]
            outputs = {self.nodes[0].getnewaddress(): 1}
            rawtx = self.nodes[0].createrawtransaction(inputs, outputs)

            prevtx = dict(txid=txid, scriptPubKey=pubkey, vout=3, amount=1)
            succ = self.nodes[0].signrawtransactionwithwallet(rawtx, [prevtx])
            assert succ["complete"]

            if type == "legacy":
                del prevtx["amount"]
                succ = self.nodes[0].signrawtransactionwithwallet(rawtx, [prevtx])
                assert succ["complete"]
            else:
                assert_raises_rpc_error(-3, "Missing amount", self.nodes[0].signrawtransactionwithwallet, rawtx, [
                    {
                        "txid": txid,
                        "scriptPubKey": pubkey,
                        "vout": 3,
                    }
                ])

            assert_raises_rpc_error(-3, "Missing vout", self.nodes[0].signrawtransactionwithwallet, rawtx, [
                {
                    "txid": txid,
                    "scriptPubKey": pubkey,
                    "amount": 1,
                }
            ])
            assert_raises_rpc_error(-3, "Missing txid", self.nodes[0].signrawtransactionwithwallet, rawtx, [
                {
                    "scriptPubKey": pubkey,
                    "vout": 3,
                    "amount": 1,
                }
            ])
            assert_raises_rpc_error(-3, "Missing scriptPubKey", self.nodes[0].signrawtransactionwithwallet, rawtx, [
                {
                    "txid": txid,
                    "vout": 3,
                    "amount": 1
                }
            ])

    def run_test(self):
        self.script_verification_error_test()
        self.OP_1NEGATE_test()
        self.test_with_lock_outputs()
        self.test_fully_signed_tx()
        # Descriptor wallets enforce stricter separation between wallets with and without private
        # key while these tests require spending P2SH and non-P2SH inputs, which cannot reside in
        # the same wallet, skip.
        if not self.options.descriptors:
            self.test_signing_with_csv()
            self.test_signing_with_cltv()
        self.test_signing_with_missing_prevtx_info()


if __name__ == '__main__':
    SignRawTransactionWithWalletTest().main()
