"""
Job Stats Updater
"""
import json
import logging

import boto3
from os import getenv
from collections import Counter

from boto_utils import DecimalEncoder

logger = logging.getLogger()
logger.setLevel(logging.INFO)
ddb = boto3.resource("dynamodb")
table = ddb.Table(getenv("JobTable", "S3F2_Jobs"))


def update_stats(job_id, events):
    stats = _aggregate_stats(events)
    job = _update_job(job_id, stats)
    logger.info("Updated Stats for Job ID %s: %s", job_id, stats)
    return job


def _aggregate_stats(events):
    stats = Counter({})

    for event in events:
        event_name = event["EventName"]
        event_data = event.get("EventData", {})
        if event_name in ["QuerySucceeded", "QueryFailed"]:
            stats += Counter(
                {
                    "TotalQueryCount": 1,
                    "TotalQuerySucceededCount": 1
                    if event_name == "QuerySucceeded"
                    else 0,
                    "TotalQueryFailedCount": 1 if event_name == "QueryFailed" else 0,
                    "TotalQueryScannedInBytes": event_data.get("Statistics", {}).get(
                        "DataScannedInBytes", 0
                    ),
                    "TotalQueryTimeInMillis": event_data.get("Statistics", {}).get(
                        "EngineExecutionTimeInMillis", 0
                    ),
                }
            )
        if event_name in [
            "ObjectUpdated",
            "ObjectUpdateSkipped",
            "ObjectUpdateFailed",
            "ObjectRollbackFailed",
        ]:
            stats += Counter(
                {
                    "TotalObjectUpdatedCount": 1
                    if event_name == "ObjectUpdated"
                    else 0,
                    "TotalObjectUpdateSkippedCount": 1
                    if event_name == "ObjectUpdateSkipped"
                    else 0,
                    "TotalObjectUpdateFailedCount": 1
                    if event_name == "ObjectUpdateFailed"
                    else 0,
                    "TotalObjectRollbackFailedCount": 1
                    if event_name == "ObjectRollbackFailed"
                    else 0,
                }
            )

    return stats


def _update_job(job_id, stats):
    try:
        return table.update_item(
            Key={
                "Id": job_id,
                "Sk": job_id,
            },
            ConditionExpression="#Id = :Id AND #Sk = :Sk",
            UpdateExpression="set #qt = if_not_exists(#qt, :z) + :qt, "
            "#qs = if_not_exists(#qs, :z) + :qs, "
            "#qf = if_not_exists(#qf, :z) + :qf, "
            "#qb = if_not_exists(#qb, :z) + :qb, "
            "#qm = if_not_exists(#qm, :z) + :qm, "
            "#ou = if_not_exists(#ou, :z) + :ou, "
            "#os = if_not_exists(#os, :z) + :os, "
            "#of = if_not_exists(#of, :z) + :of, "
            "#or = if_not_exists(#or, :z) + :or",
            ExpressionAttributeNames={
                "#Id": "Id",
                "#Sk": "Sk",
                "#qt": "TotalQueryCount",
                "#qs": "TotalQuerySucceededCount",
                "#qf": "TotalQueryFailedCount",
                "#qb": "TotalQueryScannedInBytes",
                "#qm": "TotalQueryTimeInMillis",
                "#ou": "TotalObjectUpdatedCount",
                "#os": "TotalObjectUpdateSkippedCount",
                "#of": "TotalObjectUpdateFailedCount",
                "#or": "TotalObjectRollbackFailedCount",
            },
            ExpressionAttributeValues={
                ":Id": job_id,
                ":Sk": job_id,
                ":qt": stats.get("TotalQueryCount", 0),
                ":qs": stats.get("TotalQuerySucceededCount", 0),
                ":qf": stats.get("TotalQueryFailedCount", 0),
                ":qb": stats.get("TotalQueryScannedInBytes", 0),
                ":qm": stats.get("TotalQueryTimeInMillis", 0),
                ":ou": stats.get("TotalObjectUpdatedCount", 0),
                ":os": stats.get("TotalObjectUpdateSkippedCount", 0),
                ":of": stats.get("TotalObjectUpdateFailedCount", 0),
                ":or": stats.get("TotalObjectRollbackFailedCount", 0),
                ":z": 0,
            },
            ReturnValues="ALL_NEW",
        )["Attributes"]
    except ddb.meta.client.exceptions.ConditionalCheckFailedException:
        logger.warning("Job %s does not exist", job_id)