#!/usr/bin/env python2
# Copyright (c) 2014-2015 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.

# Base class for RPC testing

# Add python-bitcoinrpc to module search path:
import os
import sys

import shutil
import tempfile
import traceback

from .util import (
    initialize_chain,
    assert_equal,
    start_nodes,
    connect_nodes_bi,
    sync_blocks,
    sync_mempools,
    stop_nodes,
    wait_bitcoinds,
    enable_coverage,
    check_json_precision,
    initialize_chain_clean,
)
from .authproxy import AuthServiceProxy, JSONRPCException


class BitcoinTestFramework(object):

    # These may be over-ridden by subclasses:
    def run_test(self):
        for node in self.nodes:
            assert_equal(node.getblockcount(), 200)
            assert_equal(node.getbalance(), 25*500)

    def add_options(self, parser):
        pass

    def setup_chain(self):
        print("Initializing test directory "+self.options.tmpdir)
        initialize_chain(self.options.tmpdir)

    def setup_nodes(self):
        return start_nodes(4, self.options.tmpdir)

    def setup_network(self, split = False):
        self.nodes = self.setup_nodes()

        # Connect the nodes as a "chain".  This allows us
        # to split the network between nodes 1 and 2 to get
        # two halves that can work on competing chains.

        # If we joined network halves, connect the nodes from the joint
        # on outward.  This ensures that chains are properly reorganised.
        if not split:
            connect_nodes_bi(self.nodes, 1, 2)
            sync_blocks(self.nodes[1:3])
            sync_mempools(self.nodes[1:3])

        connect_nodes_bi(self.nodes, 0, 1)
        connect_nodes_bi(self.nodes, 2, 3)
        self.is_network_split = split
        self.sync_all()

    def split_network(self):
        """
        Split the network of four nodes into nodes 0/1 and 2/3.
        """
        assert not self.is_network_split
        stop_nodes(self.nodes)
        wait_bitcoinds()
        self.setup_network(True)

    def sync_all(self):
        if self.is_network_split:
            sync_blocks(self.nodes[:2])
            sync_blocks(self.nodes[2:])
            sync_mempools(self.nodes[:2])
            sync_mempools(self.nodes[2:])
        else:
            sync_blocks(self.nodes)
            sync_mempools(self.nodes)

    def join_network(self):
        """
        Join the (previously split) network halves together.
        """
        assert self.is_network_split
        stop_nodes(self.nodes)
        wait_bitcoinds()
        self.setup_network(False)

    def main(self):
        import optparse

        parser = optparse.OptionParser(usage="%prog [options]")
        parser.add_option("--nocleanup", dest="nocleanup", default=False, action="store_true",
                          help="Leave zixxds and test.* datadir on exit or error")
        parser.add_option("--noshutdown", dest="noshutdown", default=False, action="store_true",
                          help="Don't stop zixxds after the test execution")
        parser.add_option("--srcdir", dest="srcdir", default="../../src",
                          help="Source directory containing zixxd/zixx-cli (default: %default)")
        parser.add_option("--tmpdir", dest="tmpdir", default=tempfile.mkdtemp(prefix="test"),
                          help="Root directory for datadirs")
        parser.add_option("--tracerpc", dest="trace_rpc", default=False, action="store_true",
                          help="Print out all RPC calls as they are made")
        parser.add_option("--coveragedir", dest="coveragedir",
                          help="Write tested RPC commands into this directory")
        self.add_options(parser)
        (self.options, self.args) = parser.parse_args()

        if self.options.trace_rpc:
            import logging
            logging.basicConfig(level=logging.DEBUG)

        if self.options.coveragedir:
            enable_coverage(self.options.coveragedir)

        os.environ['PATH'] = self.options.srcdir+":"+self.options.srcdir+"/qt:"+os.environ['PATH']

        check_json_precision()

        success = False
        try:
            if not os.path.isdir(self.options.tmpdir):
                os.makedirs(self.options.tmpdir)
            self.setup_chain()

            self.setup_network()

            self.run_test()

            success = True

        except JSONRPCException as e:
            print("JSONRPC error: "+e.error['message'])
            traceback.print_tb(sys.exc_info()[2])
        except AssertionError as e:
            print("Assertion failed: "+ str(e))
            traceback.print_tb(sys.exc_info()[2])
        except Exception as e:
            print("Unexpected exception caught during testing: " + repr(e))
            traceback.print_tb(sys.exc_info()[2])

        if not self.options.noshutdown:
            print("Stopping nodes")
            stop_nodes(self.nodes)
            wait_bitcoinds()
        else:
            print("Note: zixxds were not stopped and may still be running")

        if not self.options.nocleanup and not self.options.noshutdown:
            print("Cleaning up")
            shutil.rmtree(self.options.tmpdir)

        if success:
            print("Tests successful")
            sys.exit(0)
        else:
            print("Failed")
            sys.exit(1)


# Test framework for doing p2p comparison testing, which sets up some bitcoind
# binaries:
# 1 binary: test binary
# 2 binaries: 1 test binary, 1 ref binary
# n>2 binaries: 1 test binary, n-1 ref binaries

class ComparisonTestFramework(BitcoinTestFramework):

    # Can override the num_nodes variable to indicate how many nodes to run.
    def __init__(self):
        self.num_nodes = 2

    def add_options(self, parser):
        parser.add_option("--testbinary", dest="testbinary",
                          default=os.getenv("ZIXXD", "zixxd"),
                          help="bitcoind binary to test")
        parser.add_option("--refbinary", dest="refbinary",
                          default=os.getenv("ZIXXD", "zixxd"),
                          help="bitcoind binary to use for reference nodes (if any)")

    def setup_chain(self):
        print "Initializing test directory "+self.options.tmpdir
        initialize_chain_clean(self.options.tmpdir, self.num_nodes)

    def setup_network(self):
        self.nodes = start_nodes(
            self.num_nodes, self.options.tmpdir,
            extra_args=[['-debug', '-whitelist=127.0.0.1']] * self.num_nodes,
            binary=[self.options.testbinary] +
            [self.options.refbinary]*(self.num_nodes-1))
