from typing import Tuple, Optional

import boto3
from sqlalchemy import func

from app import app
from app.alarms import get_or_create_alarm
from app.extensions import db
from app.models.base import Group
from app.models.alarms import AlarmState
from app.models.mirrors import SmartProxy
from app.terraform import BaseAutomation


def alarms_in_region(region: str, prefix: str, aspect: str) -> None:
    cloudwatch = boto3.client('cloudwatch',
                              aws_access_key_id=app.config['AWS_ACCESS_KEY'],
                              aws_secret_access_key=app.config['AWS_SECRET_KEY'],
                              region_name=region)
    dist_paginator = cloudwatch.get_paginator('describe_alarms')
    page_iterator = dist_paginator.paginate(AlarmNamePrefix=prefix)
    for page in page_iterator:
        for cw_alarm in page['MetricAlarms']:
            smart_id = cw_alarm["AlarmName"][len(prefix):].split("-")
            group: Optional[Group] = Group.query.filter(func.lower(Group.group_name) == smart_id[1]).first()
            if group is None:
                print("Unable to find group for " + cw_alarm['AlarmName'])
                continue
            smart_proxy = SmartProxy.query.filter(
                SmartProxy.group_id == group.id,
                SmartProxy.region == region
            ).first()
            if smart_proxy is None:
                print("Skipping unknown instance " + cw_alarm['AlarmName'])
                continue
            alarm = get_or_create_alarm(smart_proxy.brn, aspect)
            if cw_alarm['StateValue'] == "OK":
                alarm.update_state(AlarmState.OK, "CloudWatch alarm OK")
            elif cw_alarm['StateValue'] == "ALARM":
                alarm.update_state(AlarmState.CRITICAL, "CloudWatch alarm ALARM")
            else:
                alarm.update_state(AlarmState.UNKNOWN, f"CloudWatch alarm {cw_alarm['StateValue']}")


class AlarmSmartAwsAutomation(BaseAutomation):
    short_name = "monitor_smart_aws"
    description = "Import alarms for AWS smart proxy instances"

    def automate(self, full: bool = False) -> Tuple[bool, str]:
        alarms_in_region("us-east-2", "smart-bw-out-high-", "bandwidth-out-high")
        alarms_in_region("us-east-2", "smart-cpu-high-", "instance-cpu")
        db.session.commit()
        return True, ""