#!/usr/bin/env python
# Copyright (c) 2019 The Zcash developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or https://www.opensource.org/licenses/mit-license.php .

import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."

from decimal import Decimal
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
    assert_equal,
    get_coinbase_address,
    initialize_chain_clean,
    start_nodes,
    wait_and_assert_operationid_status,
)


class ShorterBlockTimes(BitcoinTestFramework):
    def setup_nodes(self):
        return start_nodes(4, self.options.tmpdir, [[
            '-nuparams=2bb40e60:106', # Blossom
        ]] * 4)

    def setup_chain(self):
        print("Initializing test directory " + self.options.tmpdir)
        initialize_chain_clean(self.options.tmpdir, 4)

    def run_test(self):
        print "Mining blocks..."
        self.nodes[0].generate(101)
        self.sync_all()

        # Sanity-check the block height
        assert_equal(self.nodes[0].getblockcount(), 101)

        node0_taddr = get_coinbase_address(self.nodes[0])
        node0_zaddr = self.nodes[0].z_getnewaddress('sapling')
        recipients = [{'address': node0_zaddr, 'amount': Decimal('10')}]
        myopid = self.nodes[0].z_sendmany(node0_taddr, recipients, 1, Decimal('0'))
        txid = wait_and_assert_operationid_status(self.nodes[0], myopid)
        assert_equal(105, self.nodes[0].getrawtransaction(txid, 1)['expiryheight'])  # Blossom activation - 1
        self.sync_all()
        self.nodes[0].generate(1)
        self.sync_all()
        assert_equal(10, Decimal(self.nodes[0].z_gettotalbalance()['private']))

        self.nodes[0].generate(2)
        self.sync_all()
        print "Mining last pre-Blossom blocks"
        # Activate blossom
        self.nodes[1].generate(1)
        self.sync_all()
        # Check that we received a pre-Blossom mining reward
        assert_equal(10, Decimal(self.nodes[1].getwalletinfo()['immature_balance']))

        # After blossom activation the block reward will be halved
        print "Mining first Blossom block"
        self.nodes[1].generate(1)
        self.sync_all()
        # Check that we received an additional Blossom mining reward
        assert_equal(15, self.nodes[1].getwalletinfo()['immature_balance'])

        # Send and mine a transaction after activation
        myopid = self.nodes[0].z_sendmany(node0_taddr, recipients, 1, Decimal('0'))
        txid = wait_and_assert_operationid_status(self.nodes[0], myopid)
        assert_equal(147, self.nodes[0].getrawtransaction(txid, 1)['expiryheight'])  # height + 1 + 40
        self.nodes[1].generate(1)
        self.sync_all()
        assert_equal(20, Decimal(self.nodes[0].z_gettotalbalance()['private']))


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