#!/usr/bin/env python3

# Copyright (C) 2020 The btclib developers
#
# This file is part of btclib. It is subject to the license terms in the
# LICENSE file found in the top-level directory of this distribution.
#
# No part of btclib including this file, may be copied, modified, propagated,
# or distributed except according to the terms contained in the LICENSE file.

"Tests for `btclib.sighash` module."

# test vector at https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki
from btclib.sighash import _get_witness_v0_scriptCodes, get_sighash, segwit_v0
from btclib.tx import Tx

# from btclib.tx_in import TxIn, OutPoint
from btclib.tx_out import TxOut


def test_native_p2wpkh():
    transaction = Tx.deserialize(
        "0100000002fff7f7881a8099afa6940d42d1e7f6362bec38171ea3edf433541db4e4ad969f0000000000eeffffffef51e1b804cc89d182d279655c3aa89e815b1b309fe287d9b2b55d57b90ec68a0100000000ffffffff02202cb206000000001976a9148280b37df378db99f66f85c95a783a76ac7a6d5988ac9093510d000000001976a9143bde42dbee7e4dbe6a21b2d50ce2f0167faa815988ac11000000"
    )

    previous_txout = TxOut(
        value=600000000,
        scriptPubKey=bytes.fromhex("00141d0f172a0ecb48aee1be1f2687d2963ae33f71a1"),
    )

    sighash = get_sighash(transaction, previous_txout, 1, 0x01)

    assert (
        sighash.hex()
        == "c37af31116d1b27caf68aae9e3ac82f1477929014d5b917657d0eb49478cb670"
    )


def test_wrapped_p2wpkh():
    transaction = Tx.deserialize(
        "0100000001db6b1b20aa0fd7b23880be2ecbd4a98130974cf4748fb66092ac4d3ceb1a54770100000000feffffff02b8b4eb0b000000001976a914a457b684d7f0d539a46a45bbc043f35b59d0d96388ac0008af2f000000001976a914fd270b1ee6abcaea97fea7ad0402e8bd8ad6d77c88ac92040000"
    )
    transaction.vin[0].scriptSig = bytes.fromhex(
        "001479091972186c449eb1ded22b78e40d009bdf0089"
    )

    previous_txout = TxOut(
        value=1000000000,
        scriptPubKey=bytes.fromhex("a9144733f37cf4db86fbc2efed2500b4f4e49f31202387"),
    )

    sighash = get_sighash(transaction, previous_txout, 0, 0x01)

    assert (
        sighash.hex()
        == "64f3b0f4dd2bb3aa1ce8566d220cc74dda9df97d8490cc81d89d735c92e59fb6"
    )


def test_native_p2wsh():
    transaction = Tx.deserialize(
        "0100000002fe3dc9208094f3ffd12645477b3dc56f60ec4fa8e6f5d67c565d1c6b9216b36e0000000000ffffffff0815cf020f013ed6cf91d29f4202e8a58726b1ac6c79da47c23d1bee0a6925f80000000000ffffffff0100f2052a010000001976a914a30741f8145e5acadf23f751864167f32e0963f788ac00000000"
    )
    transaction.vin[1].txinwitness = [
        bytes.fromhex(
            "21026dccc749adc2a9d0d89497ac511f760f45c47dc5ed9cf352a58ac706453880aeadab210255a9626aebf5e29c0e6538428ba0d1dcf6ca98ffdf086aa8ced5e0d0215ea465ac"
        )
    ]

    previous_txout = TxOut(
        value=4900000000,
        scriptPubKey=bytes.fromhex(
            "00205d1b56b63d714eebe542309525f484b7e9d6f686b3781b6f61ef925d66d6f6a0"
        ),
    )

    sighash = get_sighash(transaction, previous_txout, 1, 0x03)

    assert (
        sighash.hex()
        == "82dde6e4f1e94d02c2b7ad03d2115d691f48d064e9d52f58194a6637e4194391"
    )

    script_code = _get_witness_v0_scriptCodes(transaction.vin[1].txinwitness[-1])[1]
    sighash = segwit_v0(script_code, transaction, 1, 0x03, previous_txout.value)
    assert (
        sighash.hex()
        == "fef7bd749cce710c5c052bd796df1af0d935e59cea63736268bcbe2d2134fc47"
    )


def test_native_p2wsh_2():
    transaction = Tx.deserialize(
        "0100000002e9b542c5176808107ff1df906f46bb1f2583b16112b95ee5380665ba7fcfc0010000000000ffffffff80e68831516392fcd100d186b3c2c7b95c80b53c77e77c35ba03a66b429a2a1b0000000000ffffffff0280969800000000001976a914de4b231626ef508c9a74a8517e6783c0546d6b2888ac80969800000000001976a9146648a8cd4531e1ec47f35916de8e259237294d1e88ac00000000"
    )
    transaction.vin[0].txinwitness = [
        bytes.fromhex(
            "0063ab68210392972e2eb617b2388771abe27235fd5ac44af8e61693261550447a4c3e39da98ac"
        )
    ]
    transaction.vin[1].txinwitness = [
        bytes.fromhex(
            "5163ab68210392972e2eb617b2388771abe27235fd5ac44af8e61693261550447a4c3e39da98ac"
        )
    ]

    previous_txout_1 = TxOut(
        value=16777215,
        scriptPubKey=bytes.fromhex(
            "0020ba468eea561b26301e4cf69fa34bde4ad60c81e70f059f045ca9a79931004a4d"
        ),
    )
    sighash = get_sighash(transaction, previous_txout_1, 0, 0x83)
    assert (
        sighash.hex()
        == "e9071e75e25b8a1e298a72f0d2e9f4f95a0f5cdf86a533cda597eb402ed13b3a"
    )

    previous_txout_2 = TxOut(
        value=16777215,
        scriptPubKey=bytes.fromhex(
            "0020d9bbfbe56af7c4b7f960a70d7ea107156913d9e5a26b0a71429df5e097ca6537"
        ),
    )

    script_code = _get_witness_v0_scriptCodes(transaction.vin[1].txinwitness[-1])[1]
    sighash = segwit_v0(script_code, transaction, 1, 0x83, previous_txout_2.value)
    assert (
        sighash.hex()
        == "cd72f1f1a433ee9df816857fad88d8ebd97e09a75cd481583eb841c330275e54"
    )


def test_wrapped_p2wsh():

    transaction = Tx.deserialize(
        "010000000136641869ca081e70f394c6948e8af409e18b619df2ed74aa106c1ca29787b96e0100000000ffffffff0200e9a435000000001976a914389ffce9cd9ae88dcc0631e88a821ffdbe9bfe2688acc0832f05000000001976a9147480a33f950689af511e6e84c138dbbd3c3ee41588ac00000000"
    )
    transaction.vin[0].txinwitness = [
        bytes.fromhex(
            "56210307b8ae49ac90a048e9b53357a2354b3334e9c8bee813ecb98e99a7e07e8c3ba32103b28f0c28bfab54554ae8c658ac5c3e0ce6e79ad336331f78c428dd43eea8449b21034b8113d703413d57761b8b9781957b8c0ac1dfe69f492580ca4195f50376ba4a21033400f6afecb833092a9a21cfdf1ed1376e58c5d1f47de74683123987e967a8f42103a6d48b1131e94ba04d9737d61acdaa1322008af9602b3b14862c07a1789aac162102d8b661b0b3302ee2f162b09e07a55ad5dfbe673a9f01d9f0c19617681024306b56ae"
        )
    ]

    previous_txout = TxOut(
        value=987654321,
        scriptPubKey=bytes.fromhex(
            "0020a16b5755f7f6f96dbd65f5f0d6ab9418b89af4b1f14a1bb8a09062c35f0dcb54"
        ),
    )

    assert (
        get_sighash(transaction, previous_txout, 0, 0x01).hex()
        == "185c0be5263dce5b4bb50a047973c1b6272bfbd0103a89444597dc40b248ee7c"
    )

    assert (
        get_sighash(transaction, previous_txout, 0, 0x02).hex()
        == "e9733bc60ea13c95c6527066bb975a2ff29a925e80aa14c213f686cbae5d2f36"
    )

    assert (
        get_sighash(transaction, previous_txout, 0, 0x03).hex()
        == "1e1f1c303dc025bd664acb72e583e933fae4cff9148bf78c157d1e8f78530aea"
    )

    assert (
        get_sighash(transaction, previous_txout, 0, 0x81).hex()
        == "2a67f03e63a6a422125878b40b82da593be8d4efaafe88ee528af6e5a9955c6e"
    )

    assert (
        get_sighash(transaction, previous_txout, 0, 0x82).hex()
        == "781ba15f3779d5542ce8ecb5c18716733a5ee42a6f51488ec96154934e2c890a"
    )

    assert (
        get_sighash(transaction, previous_txout, 0, 0x83).hex()
        == "511e8e52ed574121fc1b654970395502128263f62662e076dc6baf05c2e6a99b"
    )
