#!/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 HD Wallet keypool restore function.

Two nodes. Node1 is under test. Node0 is providing transactions and generating blocks.

- Start node1, shutdown and backup wallet.
- Generate 110 keys (enough to drain the keypool). Store key 90 (in the initial keypool) and key 110 (beyond the initial keypool). Send funds to key 90 and key 110.
- Stop node1, clear the datadir, move wallet file back into the datadir and restart node1.
- connect node1 to node0. Verify that they sync and node1 receives its funds."""
import os
import shutil
from decimal import Decimal

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


class KeypoolRestoreTest(BitcoinTestFramework):
    def set_test_params(self):
        self.setup_clean_chain = True
        self.num_nodes = 2
        self.extra_args = [[], ['-keypool=100']]

    def skip_test_if_missing_module(self):
        self.skip_if_no_wallet()

    def run_test(self):
        wallet_path = os.path.join(self.nodes[1].datadir, "regtest", "wallets", "wallet.dat")
        wallet_backup_path = os.path.join(self.nodes[1].datadir, "wallet.bak")
        self.nodes[0].generate(101)

        self.log.info("Make backup of wallet")
        self.stop_node(1)
        shutil.copyfile(wallet_path, wallet_backup_path)
        self.start_node(1, self.extra_args[1])
        connect_nodes_bi(self.nodes, 0, 1)

        self.log.info("Generate keys for wallet")
        for _ in range(90):
            addr_oldpool = self.nodes[1].getnewaddress()
        for _ in range(20):
            addr_extpool = self.nodes[1].getnewaddress()

        self.log.info("Send funds to wallet")
        self.nodes[0].sendtoaddress(addr_oldpool, 0.1)
        self.nodes[0].generate(1)
        self.nodes[0].sendtoaddress(addr_extpool, 0.05)
        self.nodes[0].generate(1)
        sync_blocks(self.nodes)

        self.log.info("Restart node with wallet backup")
        self.stop_node(1)
        shutil.copyfile(wallet_backup_path, wallet_path)
        self.start_node(1, self.extra_args[1])
        connect_nodes_bi(self.nodes, 0, 1)
        self.sync_all()

        self.log.info("Verify keypool is restored and balance is correct")
        assert_equal(self.nodes[1].getbalance(), Decimal("0.15"))
        assert_equal(self.nodes[1].listtransactions()[0]['category'], "receive")
        # Check that we have marked all keys up to the used keypool key as used
        assert_equal(self.nodes[1].getaddressinfo(self.nodes[1].getnewaddress())['hdkeypath'], "m/0'/0'/110'")


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