#!/usr/bin/env python2
# Copyright (c) 2016-2020 The Hush developers
# Copyright (c) 2014 The Bitcoin Core developers
# Distributed under the GPLv3 software license, see the accompanying
# file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html

#
# Test InvalidateBlock code
#

from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import initialize_chain_clean, start_node, \
    connect_nodes_bi, sync_blocks

import time

class InvalidateTest(BitcoinTestFramework):
    def setup_chain(self):
        print("Initializing test directory "+self.options.tmpdir)
        initialize_chain_clean(self.options.tmpdir, 3)

    def setup_network(self):
        self.nodes = []
        self.is_network_split = False
        self.nodes.append(start_node(0, self.options.tmpdir, ["-debug"]))
        self.nodes.append(start_node(1, self.options.tmpdir, ["-debug"]))
        self.nodes.append(start_node(2, self.options.tmpdir, ["-debug"]))

    def run_test(self):
        print "Make sure we repopulate setBlockIndexCandidates after InvalidateBlock:"
        print "Mine 4 blocks on Node 0"
        self.nodes[0].generate(4)
        assert(self.nodes[0].getblockcount() == 4)
        besthash = self.nodes[0].getbestblockhash()

        print "Mine competing 6 blocks on Node 1"
        self.nodes[1].generate(6)
        assert(self.nodes[1].getblockcount() == 6)

        print "Connect nodes to force a reorg"
        connect_nodes_bi(self.nodes,0,1)
        sync_blocks(self.nodes[0:2])
        assert(self.nodes[0].getblockcount() == 6)
        badhash = self.nodes[1].getblockhash(2)

        print "Invalidate block 2 on node 0 and verify we reorg to node 0's original chain"
        self.nodes[0].invalidateblock(badhash)
        newheight = self.nodes[0].getblockcount()
        newhash = self.nodes[0].getbestblockhash()
        if (newheight != 4 or newhash != besthash):
            raise AssertionError("Wrong tip for node0, hash %s, height %d"%(newhash,newheight))

        print "\nMake sure we won't reorg to a lower work chain:"
        connect_nodes_bi(self.nodes,1,2)
        print "Sync node 2 to node 1 so both have 6 blocks"
        sync_blocks(self.nodes[1:3])
        assert(self.nodes[2].getblockcount() == 6)
        print "Invalidate block 5 on node 1 so its tip is now at 4"
        self.nodes[1].invalidateblock(self.nodes[1].getblockhash(5))
        assert(self.nodes[1].getblockcount() == 4)
        print "Invalidate block 3 on node 2, so its tip is now 2"
        self.nodes[2].invalidateblock(self.nodes[2].getblockhash(3))
        assert(self.nodes[2].getblockcount() == 2)
        print "..and then mine a block"
        self.nodes[2].generate(1)
        print "Verify all nodes are at the right height"
        time.sleep(5)
        for i in xrange(3):
            print i,self.nodes[i].getblockcount()
        assert(self.nodes[2].getblockcount() == 3)
        assert(self.nodes[0].getblockcount() == 4)
        node1height = self.nodes[1].getblockcount()
        if node1height < 4:
            raise AssertionError("Node 1 reorged to a lower height: %d"%node1height)

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