import logging

import requests
from celery import shared_task
from django.conf import settings

logger = logging.getLogger(__name__)


def _send_sms(receptor, pattern_code, variables: list = None):
    """
    Send OTP SMS using SMS.ir pattern-based API
    """
    SMS_ENDPOINT = "https://api.sms.ir/v1/send/verify"

    variables = variables or []
    headers = {"Content-Type": "application/json", "Accept": "text/plain", "x-api-key": settings.SMS_APIKEY}
    payload = {
        "mobile": receptor,
        "templateId": str(pattern_code),
        "parameters": variables,
    }

    logger.info(f"Sending SMS to {receptor} with payload: {payload}")

    try:
        response = requests.post(SMS_ENDPOINT, data=payload, headers=headers, timeout=10)

        logger.info(f"Response status: {response.status_code}")
        logger.info(f"Response text: {response.text}")

        if response.status_code == 200:
            result = response.json()

            if str(result.get("status", "")) == "1":
                logger.info(f"SMS sent successfully to {receptor}")
            else:
                logger.error(f"SMS.ir API error: {result}")
        else:
            logger.error(f"HTTP error sending SMS: {response.status_code} - {response.text}")

        return response

    except requests.exceptions.RequestException:
        logger.error("Network error in send_sms", exc_info=True)
        return None


@shared_task
def send_verification_sms(mobile, code):
    logger.info(f"Starting to send SMS to {mobile} with code {code}")
    try:
        if not settings.SMS_APIKEY:
            logger.info("SMS_APIKEY is not configured. Skipping real SMS delivery for %s with code %s", mobile, code)
            return {"mobile": mobile, "code": str(code), "sent": False}

        variables = [{"name": "OTP", "value": str(code)}]
        response = _send_sms(mobile, 570574, variables=variables)
        if response and response.status_code == 200:
            logger.info(f"Verification SMS sent to {mobile}")
        else:
            raise Exception("Failed to send SMS")
    except Exception as e:
        logger.error(f"Error in send_verification_sms: {e}", exc_info=True)
        raise  # For Celery retry