#!/usr/bin/env python3
# Copyright (c) 2018-2019 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 the wallet balance RPC methods."""
from decimal import Decimal

from test_framework.address import ADDRESS_BCRT1_UNSPENDABLE as ADDRESS_WATCHONLY
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
    assert_equal,
    assert_raises_rpc_error,
)


def create_transactions(node, address, amt, fees):
    # Create and sign raw transactions from node to address for amt.
    # Creates a transaction for each fee and returns an array
    # of the raw transactions.
    utxos = node.listunspent(0)

    # Create transactions
    inputs = []
    ins_total = 0
    for utxo in utxos:
        inputs.append({"txid": utxo["txid"], "vout": utxo["vout"]})
        ins_total += utxo['amount']
        if ins_total > amt:
            break

    txs = []
    for fee in fees:
        outputs = {address: amt, node.getrawchangeaddress(): ins_total - amt - fee}
        raw_tx = node.createrawtransaction(inputs, outputs, 0, True)
        raw_tx = node.signrawtransactionwithwallet(raw_tx)
        txs.append(raw_tx)

    return txs

class WalletTest(BitcoinTestFramework):
    def set_test_params(self):
        self.num_nodes = 2
        self.setup_clean_chain = True
        self.extra_args = [
            ['-limitdescendantcount=3'],  # Limit mempool descendants as a hack to have wallet txs rejected from the mempool
            [],
        ]

    def skip_test_if_missing_module(self):
        self.skip_if_no_wallet()

    def run_test(self):
        self.nodes[0].importaddress(ADDRESS_WATCHONLY)
        # Check that nodes don't own any UTXOs
        assert_equal(len(self.nodes[0].listunspent()), 0)
        assert_equal(len(self.nodes[1].listunspent()), 0)

        self.log.info("Mining blocks ...")

        self.nodes[0].generate(1)
        self.sync_all()
        self.nodes[1].generate(1)
        self.nodes[1].generatetoaddress(101, ADDRESS_WATCHONLY)
        self.sync_all()

        assert_equal(self.nodes[0].getbalance(), 50)
        assert_equal(self.nodes[1].getbalance(), 50)

        self.log.info("Test getbalance with different arguments")
        assert_equal(self.nodes[0].getbalance("*"), 50)
        assert_equal(self.nodes[0].getbalance("*", 1), 50)
        assert_equal(self.nodes[0].getbalance("*", 1, True), 100)
        assert_equal(self.nodes[0].getbalance(minconf=1), 50)
        assert_equal(self.nodes[0].getbalance(minconf=0, include_watchonly=True), 100)
        assert_equal(self.nodes[1].getbalance(minconf=0, include_watchonly=True), 50)

        # Send 40 BTC from 0 to 1 and 60 BTC from 1 to 0.
        txs = create_transactions(self.nodes[0], self.nodes[1].getnewaddress(), 40, [Decimal('0.01')])
        self.nodes[0].sendrawtransaction(txs[0]['hex'])
        self.nodes[1].sendrawtransaction(txs[0]['hex'])  # sending on both nodes is faster than waiting for propagation

        self.sync_all()
        txs = create_transactions(self.nodes[1], self.nodes[0].getnewaddress(), 60, [Decimal('0.01'), Decimal('0.02')])
        self.nodes[1].sendrawtransaction(txs[0]['hex'])
        self.nodes[0].sendrawtransaction(txs[0]['hex'])  # sending on both nodes is faster than waiting for propagation
        self.sync_all()

        # First argument of getbalance must be set to "*"
        assert_raises_rpc_error(-32, "dummy first argument must be excluded or set to \"*\"", self.nodes[1].getbalance, "")

        self.log.info("Test getbalance and getunconfirmedbalance with unconfirmed inputs")

        def test_balances(*, fee_node_1=0):
            # getbalance without any arguments includes unconfirmed transactions, but not untrusted transactions
            assert_equal(self.nodes[0].getbalance(), Decimal('9.99'))  # change from node 0's send
            assert_equal(self.nodes[1].getbalance(), Decimal('30') - fee_node_1)  # change from node 1's send
            # Same with minconf=0
            assert_equal(self.nodes[0].getbalance(minconf=0), Decimal('9.99'))
            assert_equal(self.nodes[1].getbalance(minconf=0), Decimal('30') - fee_node_1)
            # getbalance with a minconf incorrectly excludes coins that have been spent more recently than the minconf blocks ago
            # TODO: fix getbalance tracking of coin spentness depth
            assert_equal(self.nodes[0].getbalance(minconf=1), Decimal('0'))
            assert_equal(self.nodes[1].getbalance(minconf=1), Decimal('0'))
            # getunconfirmedbalance
            assert_equal(self.nodes[0].getunconfirmedbalance(), Decimal('60'))  # output of node 1's spend
            assert_equal(self.nodes[0].getwalletinfo()["unconfirmed_balance"], Decimal('60'))
            assert_equal(self.nodes[1].getunconfirmedbalance(), Decimal('0'))  # Doesn't include output of node 0's send since it was spent
            assert_equal(self.nodes[1].getwalletinfo()["unconfirmed_balance"], Decimal('0'))

        test_balances(fee_node_1=Decimal('0.01'))

        # Node 1 bumps the transaction fee and resends
        self.nodes[1].sendrawtransaction(txs[1]['hex'])
        self.nodes[0].sendrawtransaction(txs[1]['hex'])  # sending on both nodes is faster than waiting for propagation
        self.sync_all()

        self.log.info("Test getbalance and getunconfirmedbalance with conflicted unconfirmed inputs")
        test_balances(fee_node_1=Decimal('0.02'))

        self.nodes[1].generatetoaddress(1, ADDRESS_WATCHONLY)
        self.sync_all()

        # balances are correct after the transactions are confirmed
        assert_equal(self.nodes[0].getbalance(), Decimal('69.99'))  # node 1's send plus change from node 0's send
        assert_equal(self.nodes[1].getbalance(), Decimal('29.98'))  # change from node 0's send

        # Send total balance away from node 1
        txs = create_transactions(self.nodes[1], self.nodes[0].getnewaddress(), Decimal('29.97'), [Decimal('0.01')])
        self.nodes[1].sendrawtransaction(txs[0]['hex'])
        self.nodes[1].generatetoaddress(2, ADDRESS_WATCHONLY)
        self.sync_all()

        # getbalance with a minconf incorrectly excludes coins that have been spent more recently than the minconf blocks ago
        # TODO: fix getbalance tracking of coin spentness depth
        # getbalance with minconf=3 should still show the old balance
        assert_equal(self.nodes[1].getbalance(minconf=3), Decimal('0'))

        # getbalance with minconf=2 will show the new balance.
        assert_equal(self.nodes[1].getbalance(minconf=2), Decimal('0'))

        # check mempool transactions count for wallet unconfirmed balance after
        # dynamically loading the wallet.
        before = self.nodes[1].getunconfirmedbalance()
        dst = self.nodes[1].getnewaddress()
        self.nodes[1].unloadwallet('')
        self.nodes[0].sendtoaddress(dst, 0.1)
        self.sync_all()
        self.nodes[1].loadwallet('')
        after = self.nodes[1].getunconfirmedbalance()
        assert_equal(before + Decimal('0.1'), after)

        # Create 3 more wallet txs, where the last is not accepted to the
        # mempool because it is the third descendant of the tx above
        for _ in range(3):
            txid = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), 99)
        assert txid not in self.nodes[0].getrawmempool()
        assert_equal(self.nodes[0].getbalance(minconf=0), 0)  # wallet txs not in the mempool are untrusted


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