#!/usr/bin/env python3
# Copyright (c) 2014-2016 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 -alertnotify, -blocknotify and -walletnotify options."""
import os

from test_framework.address import ADDRESS_BCRT1_UNSPENDABLE
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
    assert_equal,
    wait_until,
)

# Linux allow all characters other than \x00
# Windows disallow control characters (0-31) and /\?%:|"<>
FILE_CHAR_START = 32 if os.name == 'nt' else 1
FILE_CHAR_END = 128
FILE_CHARS_DISALLOWED = '/\\?%*:|"<>' if os.name == 'nt' else '/'


def notify_outputname(walletname, txid):
    return txid if os.name == 'nt' else '{}_{}'.format(walletname, txid)


class NotificationsTest(BitcoinTestFramework):
    def set_test_params(self):
        self.num_nodes = 2
        self.setup_clean_chain = True

    def setup_network(self):
        self.wallet = ''.join(chr(i) for i in range(FILE_CHAR_START, FILE_CHAR_END) if chr(i) not in FILE_CHARS_DISALLOWED)
        self.alertnotify_dir = os.path.join(self.options.tmpdir, "alertnotify")
        self.blocknotify_dir = os.path.join(self.options.tmpdir, "blocknotify")
        self.walletnotify_dir = os.path.join(self.options.tmpdir, "walletnotify")
        os.mkdir(self.alertnotify_dir)
        os.mkdir(self.blocknotify_dir)
        os.mkdir(self.walletnotify_dir)

        # -alertnotify and -blocknotify on node0, walletnotify on node1
        self.extra_args = [[
                            "-alertnotify=echo > {}".format(os.path.join(self.alertnotify_dir, '%s')),
                            "-blocknotify=echo > {}".format(os.path.join(self.blocknotify_dir, '%s'))],
                           ["-blockversion=211",
                            "-rescan",
                            "-walletnotify=echo > {}".format(os.path.join(self.walletnotify_dir, notify_outputname('%w', '%s')))]]
        self.wallet_names = [self.default_wallet_name, self.wallet]
        super().setup_network()

    def run_test(self):
        if self.is_wallet_compiled():
            # Make the wallets
            # Ensures that node 0 and node 1 share the same wallet for the conflicting transaction tests below.
            for i, name in enumerate(self.wallet_names):
                self.nodes[i].createwallet(wallet_name=name, load_on_startup=True)

        self.log.info("test -blocknotify")
        block_count = 10
        blocks = self.nodes[1].generatetoaddress(block_count, self.nodes[1].getnewaddress() if self.is_wallet_compiled() else ADDRESS_BCRT1_UNSPENDABLE)

        # wait at most 10 seconds for expected number of files before reading the content
        wait_until(lambda: len(os.listdir(self.blocknotify_dir)) == block_count, timeout=10)

        # directory content should equal the generated blocks hashes
        assert_equal(sorted(blocks), sorted(os.listdir(self.blocknotify_dir)))

        if self.is_wallet_compiled():
            self.log.info("test -walletnotify")
            # wait at most 10 seconds for expected number of files before reading the content
            wait_until(lambda: len(os.listdir(self.walletnotify_dir)) == block_count, timeout=10)

            # directory content should equal the generated transaction hashes
            txids_rpc = list(map(lambda t: notify_outputname(self.wallet, t['txid']), self.nodes[1].listtransactions("*", block_count)))
            assert_equal(sorted(txids_rpc), sorted(os.listdir(self.walletnotify_dir)))
            self.stop_node(1)

            for tx_file in os.listdir(self.walletnotify_dir):
                os.remove(os.path.join(self.walletnotify_dir, tx_file))

            self.log.info("test -walletnotify after rescan")
            # restart node to rescan to force wallet notifications
            self.start_node(1)
            self.connect_nodes(0, 1)

            wait_until(lambda: len(os.listdir(self.walletnotify_dir)) == block_count, timeout=10)

            # directory content should equal the generated transaction hashes
            txids_rpc = list(map(lambda t: notify_outputname(self.wallet, t['txid']), self.nodes[1].listtransactions("*", block_count)))
            assert_equal(sorted(txids_rpc), sorted(os.listdir(self.walletnotify_dir)))

        # TODO: add test for `-alertnotify` large fork notifications

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