from cassandra.cluster import Cluster
from cassandra.query import BoundStatement, BatchStatement
import csv


def db_insert_csv_txs(config, tx_file):
    print(" == DB TX INSERTION SCRIPT == ")

    print(
        f"Attempting Cassandra connection @ {config['cassandra_addresses']}:{config['cassandra_port']}")
    cluster = Cluster(config['cassandra_addresses'],
                      port=config['cassandra_port'])
    session = cluster.connect(config['cassandra_keyspace'])
    print(f"Connection OK")

    with open(tx_file, newline='') as tx_csv:
        rowreader = csv.reader(tx_csv, dialect="excel")
        next(rowreader)  # skip header

        statement = session.prepare(
            f"INSERT INTO {config['tx_table_name']} (tx_id,address,value,tx_hash,block_id,timestamp) VALUES(?,?,?,?,?,?);")
        boundStatement = BoundStatement(statement)
        batchStatement = BatchStatement()

        for row in rowreader:
            batchStatement.add(boundStatement.bind(
                [int(row[0]), str(row[1]), int(row[2]), str(row[3]), int(row[4]), int(row[5])]))
        session.execute(batchStatement)

    print("Done!")
    cluster.shutdown()