import datetime
import os
from threading import Thread
import requests
import time


stage = os.getenv("STAGE", 'local')
if stage == 'local':
    QUEUES_URL = 'http://localhost:1239'
else:
    QUEUES_URL = 'http://queues:1239'


class QueuesException(Exception):
    ...


class TasksHandlerMixin:
    def _send_metric(self, start, success, end):
        try:
            metric = requests.post('http://monitoring:1237/api/v1/metrics/task', json={
                'timestamp': start.strftime("%Y-%m-%dT%H:%M:%S") + "Z",
                'service': 'botalka',
                'environment': stage,
                'queue': self.queue_name,
                'success': success,
                'execution_time_ms': (end - start).microseconds // 1000,
            })
            if metric.status_code == 202:
                print('metric ok')
            else:
                print(f'metric failed: {metric.status_code}')
        except Exception as e:
            print(f'metric failed: {e}')

    def send_metric(self, start, success, end):
        # Thread(target=self._send_metric, args=(start, success, end)).start()
        self._send_metric(start, success, end)

    def poll(self):
        while True:
            try:
                response = requests.get(f'{QUEUES_URL}/api/v1/take', headers={'queue': self.queue_name}).json()
            except requests.JSONDecodeError:
                print('Unable to decode json')
                time.sleep(3)
                continue
            task = response.get('task')
            if not task:
                time.sleep(0.2)
                continue
            start = datetime.datetime.now()
            try:
                self.process(task['payload'])
                success = True
            except Exception as exc:
                print(f'Error processing message id={task["id"]}, payload={task["payload"]}, exc={exc}')
                success = False
            end = datetime.datetime.now()
            try:
                resp = requests.post(f'{QUEUES_URL}/api/v1/finish', json={'id': task['id']})
                if resp.status_code != 202:
                    raise QueuesException
            except:
                print(f'Failed to finish task id={task["id"]}')
            self.send_metric(start, success, end)

    @property
    def queue_name(self):
        raise NotImplemented

    def process(self, payload):
        raise NotImplemented


def set_task(queue_name: str, payload: dict, seconds_to_execute: int, delay: int|None = None):
    resp = requests.post(f'{QUEUES_URL}/api/v1/put', headers={'queue': queue_name}, json={
        'payload': payload,
        'seconds_to_execute': seconds_to_execute,
        'delay': delay,
    })
    if resp.status_code != 202:
        raise QueuesException