#!/usr/bin/env python3
# Copyright (c) 2017-2018 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 that the wallet can send and receive using all combinations of address types.

There are 5 nodes-under-test:
    - node0 uses legacy addresses
    - node1 uses p2sh/segwit addresses
    - node2 uses p2sh/segwit addresses and bech32 addresses for change
    - node3 uses bech32 addresses
    - node4 uses a p2sh/segwit addresses for change

node5 exists to generate new blocks.

## Multisig address test

Test that adding a multisig address with:
    - an uncompressed pubkey always gives a legacy address
    - only compressed pubkeys gives the an `-addresstype` address

## Sending to address types test

A series of tests, iterating over node0-node4. In each iteration of the test, one node sends:
    - 10/101th of its balance to itself (using getrawchangeaddress for single key addresses)
    - 20/101th to the next node
    - 30/101th to the node after that
    - 40/101th to the remaining node
    - 1/101th remains as fee+change

Iterate over each node for single key addresses, and then over each node for
multisig addresses.

Repeat test, but with explicit address_type parameters passed to getnewaddress
and getrawchangeaddress:
    - node0 and node3 send to p2sh.
    - node1 sends to bech32.
    - node2 sends to legacy.

As every node sends coins after receiving, this also
verifies that spending coins sent to all these address types works.

## Change type test

Test that the nodes generate the correct change address type:
    - node0 always uses a legacy change address.
    - node1 uses a bech32 addresses for change if any destination address is bech32.
    - node2 always uses a bech32 address for change
    - node3 always uses a bech32 address for change
    - node4 always uses p2sh/segwit output for change.
"""

from decimal import Decimal
import itertools

from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
    assert_equal,
    assert_greater_than,
    assert_raises_rpc_error,
    connect_nodes_bi,
    sync_blocks,
    sync_mempools,
)

class AddressTypeTest(BitcoinTestFramework):
    def set_test_params(self):
        self.num_nodes = 6
        self.extra_args = [
            ["-addresstype=legacy"],
            ["-addresstype=p2sh-segwit"],
            ["-addresstype=p2sh-segwit", "-changetype=bech32"],
            ["-addresstype=bech32"],
            ["-changetype=p2sh-segwit"],
            []
        ]

    def setup_network(self):
        self.setup_nodes()

        # Fully mesh-connect nodes for faster mempool sync
        for i, j in itertools.product(range(self.num_nodes), repeat=2):
            if i > j:
                connect_nodes_bi(self.nodes, i, j)
        self.sync_all()

    def get_balances(self, confirmed=True):
        """Return a list of confirmed or unconfirmed balances."""
        if confirmed:
            return [self.nodes[i].getbalance() for i in range(4)]
        else:
            return [self.nodes[i].getunconfirmedbalance() for i in range(4)]

    def test_address(self, node, address, multisig, typ):
        """Run sanity checks on an address."""
        info = self.nodes[node].getaddressinfo(address)
        assert(self.nodes[node].validateaddress(address)['isvalid'])
        if not multisig and typ == 'legacy':
            # P2PKH
            assert(not info['isscript'])
            assert(not info['iswitness'])
            assert('pubkey' in info)
        elif not multisig and typ == 'p2sh-segwit':
            # P2SH-P2WPKH
            assert(info['isscript'])
            assert(not info['iswitness'])
            assert_equal(info['script'], 'witness_v0_keyhash')
            assert('pubkey' in info)
        elif not multisig and typ == 'bech32':
            # P2WPKH
            assert(not info['isscript'])
            assert(info['iswitness'])
            assert_equal(info['witness_version'], 0)
            assert_equal(len(info['witness_program']), 40)
            assert('pubkey' in info)
        elif typ == 'legacy':
            # P2SH-multisig
            assert(info['isscript'])
            assert_equal(info['script'], 'multisig')
            assert(not info['iswitness'])
            assert('pubkeys' in info)
        elif typ == 'p2sh-segwit':
            # P2SH-P2WSH-multisig
            assert(info['isscript'])
            assert_equal(info['script'], 'witness_v0_scripthash')
            assert(not info['iswitness'])
            assert(info['embedded']['isscript'])
            assert_equal(info['embedded']['script'], 'multisig')
            assert(info['embedded']['iswitness'])
            assert_equal(info['embedded']['witness_version'], 0)
            assert_equal(len(info['embedded']['witness_program']), 64)
            assert('pubkeys' in info['embedded'])
        elif typ == 'bech32':
            # P2WSH-multisig
            assert(info['isscript'])
            assert_equal(info['script'], 'multisig')
            assert(info['iswitness'])
            assert_equal(info['witness_version'], 0)
            assert_equal(len(info['witness_program']), 64)
            assert('pubkeys' in info)
        else:
            # Unknown type
            assert(False)

    def test_change_output_type(self, node_sender, destinations, expected_type):
        txid = self.nodes[node_sender].sendmany(fromaccount="", amounts=dict.fromkeys(destinations, 0.001))
        raw_tx = self.nodes[node_sender].getrawtransaction(txid)
        tx = self.nodes[node_sender].decoderawtransaction(raw_tx)

        # Make sure the transaction has change:
        assert_equal(len(tx["vout"]), len(destinations) + 1)

        # Make sure the destinations are included, and remove them:
        output_addresses = [vout['scriptPubKey']['addresses'][0] for vout in tx["vout"]]
        change_addresses = [d for d in output_addresses if d not in destinations]
        assert_equal(len(change_addresses), 1)

        self.log.debug("Check if change address " + change_addresses[0] + " is " + expected_type)
        self.test_address(node_sender, change_addresses[0], multisig=False, typ=expected_type)

    def run_test(self):
        # Mine 101 blocks on node5 to bring nodes out of IBD and make sure that
        # no coinbases are maturing for the nodes-under-test during the test
        self.nodes[5].generate(101)
        sync_blocks(self.nodes)

        uncompressed_1 = "0496b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be63c52da7589379515d4e0a604f8141781e62294721166bf621e73a82cbf2342c858ee"
        uncompressed_2 = "047211a824f55b505228e4c3d5194c1fcfaa15a456abdf37f9b9d97a4040afc073dee6c89064984f03385237d92167c13e236446b417ab79a0fcae412ae3316b77"
        compressed_1 = "0296b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be63c52"
        compressed_2 = "037211a824f55b505228e4c3d5194c1fcfaa15a456abdf37f9b9d97a4040afc073"

        # addmultisigaddress with at least 1 uncompressed key should return a legacy address.
        for node in range(4):
            self.test_address(node, self.nodes[node].addmultisigaddress(2, [uncompressed_1, uncompressed_2])['address'], True, 'legacy')
            self.test_address(node, self.nodes[node].addmultisigaddress(2, [compressed_1, uncompressed_2])['address'], True, 'legacy')
            self.test_address(node, self.nodes[node].addmultisigaddress(2, [uncompressed_1, compressed_2])['address'], True, 'legacy')
        # addmultisigaddress with all compressed keys should return the appropriate address type (even when the keys are not ours).
        self.test_address(0, self.nodes[0].addmultisigaddress(2, [compressed_1, compressed_2])['address'], True, 'legacy')
        self.test_address(1, self.nodes[1].addmultisigaddress(2, [compressed_1, compressed_2])['address'], True, 'p2sh-segwit')
        self.test_address(2, self.nodes[2].addmultisigaddress(2, [compressed_1, compressed_2])['address'], True, 'p2sh-segwit')
        self.test_address(3, self.nodes[3].addmultisigaddress(2, [compressed_1, compressed_2])['address'], True, 'bech32')

        for explicit_type, multisig, from_node in itertools.product([False, True], [False, True], range(4)):
            address_type = None
            if explicit_type and not multisig:
                if from_node == 1:
                    address_type = 'bech32'
                elif from_node == 0 or from_node == 3:
                    address_type = 'p2sh-segwit'
                else:
                    address_type = 'legacy'
            self.log.info("Sending from node {} ({}) with{} multisig using {}".format(from_node, self.extra_args[from_node], "" if multisig else "out", "default" if address_type is None else address_type))
            old_balances = self.get_balances()
            self.log.debug("Old balances are {}".format(old_balances))
            to_send = (old_balances[from_node] / 101).quantize(Decimal("0.00000001"))
            sends = {}

            self.log.debug("Prepare sends")
            for n, to_node in enumerate(range(from_node, from_node + 4)):
                to_node %= 4
                change = False
                if not multisig:
                    if from_node == to_node:
                        # When sending non-multisig to self, use getrawchangeaddress
                        address = self.nodes[to_node].getrawchangeaddress(address_type=address_type)
                        change = True
                    else:
                        address = self.nodes[to_node].getnewaddress(address_type=address_type)
                else:
                    addr1 = self.nodes[to_node].getnewaddress()
                    addr2 = self.nodes[to_node].getnewaddress()
                    address = self.nodes[to_node].addmultisigaddress(2, [addr1, addr2])['address']

                # Do some sanity checking on the created address
                if address_type is not None:
                    typ = address_type
                elif to_node == 0:
                    typ = 'legacy'
                elif to_node == 1 or (to_node == 2 and not change):
                    typ = 'p2sh-segwit'
                else:
                    typ = 'bech32'
                self.test_address(to_node, address, multisig, typ)

                # Output entry
                sends[address] = to_send * 10 * (1 + n)

            self.log.debug("Sending: {}".format(sends))
            self.nodes[from_node].sendmany("", sends)
            sync_mempools(self.nodes)

            unconf_balances = self.get_balances(False)
            self.log.debug("Check unconfirmed balances: {}".format(unconf_balances))
            assert_equal(unconf_balances[from_node], 0)
            for n, to_node in enumerate(range(from_node + 1, from_node + 4)):
                to_node %= 4
                assert_equal(unconf_balances[to_node], to_send * 10 * (2 + n))

            # node5 collects fee and block subsidy to keep accounting simple
            self.nodes[5].generate(1)
            sync_blocks(self.nodes)

            new_balances = self.get_balances()
            self.log.debug("Check new balances: {}".format(new_balances))
            # We don't know what fee was set, so we can only check bounds on the balance of the sending node
            assert_greater_than(new_balances[from_node], to_send * 10)
            assert_greater_than(to_send * 11, new_balances[from_node])
            for n, to_node in enumerate(range(from_node + 1, from_node + 4)):
                to_node %= 4
                assert_equal(new_balances[to_node], old_balances[to_node] + to_send * 10 * (2 + n))

        # Get one p2sh/segwit address from node2 and two bech32 addresses from node3:
        to_address_p2sh = self.nodes[2].getnewaddress()
        to_address_bech32_1 = self.nodes[3].getnewaddress()
        to_address_bech32_2 = self.nodes[3].getnewaddress()

        # Fund node 4:
        self.nodes[5].sendtoaddress(self.nodes[4].getnewaddress(), Decimal("1"))
        self.nodes[5].generate(1)
        sync_blocks(self.nodes)
        assert_equal(self.nodes[4].getbalance(), 1)

        self.log.info("Nodes with addresstype=legacy never use a P2WPKH change output")
        self.test_change_output_type(0, [to_address_bech32_1], 'legacy')

        self.log.info("Nodes with addresstype=p2sh-segwit only use a P2WPKH change output if any destination address is bech32:")
        self.test_change_output_type(1, [to_address_p2sh], 'p2sh-segwit')
        self.test_change_output_type(1, [to_address_bech32_1], 'bech32')
        self.test_change_output_type(1, [to_address_p2sh, to_address_bech32_1], 'bech32')
        self.test_change_output_type(1, [to_address_bech32_1, to_address_bech32_2], 'bech32')

        self.log.info("Nodes with change_type=bech32 always use a P2WPKH change output:")
        self.test_change_output_type(2, [to_address_bech32_1], 'bech32')
        self.test_change_output_type(2, [to_address_p2sh], 'bech32')

        self.log.info("Nodes with addresstype=bech32 always use a P2WPKH change output (unless changetype is set otherwise):")
        self.test_change_output_type(3, [to_address_bech32_1], 'bech32')
        self.test_change_output_type(3, [to_address_p2sh], 'bech32')

        self.log.info('getrawchangeaddress defaults to addresstype if -changetype is not set and argument is absent')
        self.test_address(3, self.nodes[3].getrawchangeaddress(), multisig=False, typ='bech32')

        self.log.info('test invalid address type arguments')
        assert_raises_rpc_error(-5, "Unknown address type ''", self.nodes[3].addmultisigaddress, 2, [compressed_1, compressed_2], None, '')
        assert_raises_rpc_error(-5, "Unknown address type ''", self.nodes[3].getnewaddress, None, '')
        assert_raises_rpc_error(-5, "Unknown address type ''", self.nodes[3].getrawchangeaddress, '')
        assert_raises_rpc_error(-5, "Unknown address type 'bech23'", self.nodes[3].getrawchangeaddress, 'bech23')

        self.log.info("Nodes with changetype=p2sh-segwit never use a P2WPKH change output")
        self.test_change_output_type(4, [to_address_bech32_1], 'p2sh-segwit')
        self.test_address(4, self.nodes[4].getrawchangeaddress(), multisig=False, typ='p2sh-segwit')
        self.log.info("Except for getrawchangeaddress if specified:")
        self.test_address(4, self.nodes[4].getrawchangeaddress(), multisig=False, typ='p2sh-segwit')
        self.test_address(4, self.nodes[4].getrawchangeaddress('bech32'), multisig=False, typ='bech32')

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