#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from neo4j.v1 import GraphDatabase, basic_auth
from neo4j.exceptions import ClientError, TransientError

def tx_error(tx, name, name2):
    a = tx.run("CREATE (a:Person {name: $name}) RETURN a", name=name).data()
    print(a[0]['a'])
    tx.run("CREATE (").consume()
    a = tx.run("CREATE (a:Person {name: $name}) RETURN a", name=name2).data()
    print(a[0]['a'])

def tx_good(tx, name, name2):
    a = tx.run("CREATE (a:Person {name: $name}) RETURN a", name=name).data()
    print(a[0]['a'])
    a = tx.run("CREATE (a:Person {name: $name}) RETURN a", name=name2).data()
    print(a[0]['a'])

def tx_too_long(tx):
    tx.run("MATCH (a), (b), (c), (d), (e), (f) RETURN COUNT(*) AS cnt")

with GraphDatabase.driver("bolt://localhost:7687", auth=basic_auth("", ""),
                          encrypted=False) as driver:

    def add_person(f, name, name2):
        with driver.session() as session:
            session.write_transaction(f, name, name2)

    # Wrong query.
    try:
        add_person(tx_error, "mirko", "slavko")
    except ClientError:
        pass

    # Correct query.
    add_person(tx_good, "mirka", "slavka")

    # Setup for next query.
    with driver.session() as session:
        session.run("UNWIND range(1, 100000) AS x CREATE ()")

    # Query that will run for a very long time, transient error expected.
    timed_out = False
    try:
        with driver.session() as session:
            session.run("MATCH (a), (b), (c), (d), (e), (f) RETURN COUNT(*) AS cnt")
    except TransientError:
        timed_out = True

    if timed_out:
        print("The query timed out as was expected.")
    else:
        raise Exception("The query should have timed out, but it didn't!")

    print("All ok!")