import json
import time
import requests
from pykafka.common import OffsetType

from fatcat_client import ReleaseEntity, ApiClient
from fatcat_tools import *
from .worker_common import FatcatWorker


class ElasticsearchReleaseWorker(FatcatWorker):
    """
    Consumes from release-updates topic and pushes into (presumably local)
    elasticsearch.

    Uses a consumer group to manage offset.
    """

    def __init__(self, kafka_hosts, consume_topic, poll_interval=10.0, offset=None,
            elasticsearch_backend="http://localhost:9200", elasticsearch_index="fatcat"):
        super().__init__(kafka_hosts=kafka_hosts,
                         consume_topic=consume_topic)
        self.consumer_group = "elasticsearch-updates"
        self.elasticsearch_backend = elasticsearch_backend
        self.elasticsearch_index = elasticsearch_index

    def run(self):
        consume_topic = self.kafka.topics[self.consume_topic]
        ac = ApiClient()

        consumer = consume_topic.get_balanced_consumer(
            consumer_group=self.consumer_group,
            managed=True,
            fetch_message_max_bytes=4000000, # up to ~4MBytes
            auto_commit_enable=True,
            auto_commit_interval_ms=30000, # 30 seconds
            compacted_topic=True,
        )

        for msg in consumer:
            json_str = msg.value.decode('utf-8')
            release = entity_from_json(json_str, ReleaseEntity, api_client=ac)
            #print(release)
            elasticsearch_endpoint = "{}/{}/release/{}".format(
                self.elasticsearch_backend,
                self.elasticsearch_index,
                release.ident)
            print("Updating document: {}".format(elasticsearch_endpoint))
            resp = requests.post(elasticsearch_endpoint, json=release_to_elasticsearch(release))
            resp.raise_for_status()
            #consumer.commit_offsets()