from concurrent.futures import ThreadPoolExecutor
import datetime
import os
import zoneinfo
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 __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.executor = ThreadPoolExecutor(max_workers=4)

    def _send_metric(self, start: datetime.datetime, end: datetime.datetime, success: bool):
        try:
            resp = requests.post('http://monitoring:1237/api/v1/metrics/task', json={
                'service': 'botalka',
                'queue': self.queue_name,
                'success': success,
                'timestamp': start.strftime("%Y-%m-%dT%H:%M:%S") + "Z",
                "success": success,
                "execution_time_ms": (end - start).microseconds // 1000,
                "environment": stage,
            })
            if resp.status_code == 202:
                print("Metric ok")
            else:
                print(f'metric not ok: {resp.status_code}')
        except Exception as e:
            print(f"Error sending metric: {e}")

    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(zoneinfo.ZoneInfo("Europe/Moscow"))
            try:
                print(f'process task with id {task["id"]}')
                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(zoneinfo.ZoneInfo("Europe/Moscow"))
            if success:
                try:
                    resp = requests.post(f'{QUEUES_URL}/api/v1/finish', json={'id': task['id']})
                    if resp.status_code != 202:
                        raise QueuesException
                    print(f'finish task with id {task["id"]}')
                except:
                    print(f'Failed to finish task id={task["id"]}')
            self.executor.submit(self._send_metric, start, end, success)

    @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