# tested

from boa.interop.System.Blockchain import GetBlock
from boa.interop.System.Block import *


def Main(operation, height):

    block = GetBlock(height)

    if operation == "get_hash":
        return block.Hash

    elif operation == "get_index":
        return block.Index

    elif operation == "get_timestamp":
        return block.Timestamp

    elif operation == "get_prevhash":
        return block.PrevHash

    elif operation == "get_version":
        return block.Version

    elif operation == "get_nextconsensus":
        return block.NextConsensus

    elif operation == "get_merkleroot":
        return block.MerkleRoot

    elif operation == "get_consensusdata":
        return block.ConsensusData

    elif operation == "get_transactioncount":
        return block.TransactionCount

    elif operation == "get_transactions":
        return block.Transactions

    elif operation == "get_transaction":
        return GetTransaction(block, 0)

    return "unknown operation"