import pika
import json
import time
import threading


class LectureConsumer1:
    def __init__(self):
        self.connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
        self.channel = self.connection.channel()
        self.channel.exchange_declare(exchange='lecture_exchange', exchange_type='fanout')

        result = self.channel.queue_declare(queue='', exclusive=True)
        self.queue_name = result.method.queue
        print('slow + ' + self.queue_name)

        self.channel.queue_bind(exchange='lecture_exchange', queue=self.queue_name)

    def callback(self, ch, method, properties, body):
        lecture_event = json.loads(body)
        print(f" [x] Consumer_slow received lecture event: {lecture_event}")
        time.sleep(3)
        print(f" [x] Consumer_slow processed lecture event: {lecture_event}")

    def consume_lectures(self):
        self.channel.basic_consume(queue=self.queue_name, on_message_callback=self.callback)
        print(' [*] Consumer_slow waiting for lecture events. To exit press CTRL+C')
        self.channel.start_consuming()


if __name__ == '__main__':
    lecture_consumer1 = LectureConsumer1()
    try:
        t1 = threading.Thread(target=lecture_consumer1.consume_lectures)
        t1.start()
        t1.join()
    except KeyboardInterrupt:
        lecture_consumer1.connection.close()