import logging

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

logger = logging.getLogger(__name__)

SMS_ENDPOINT = "https://api.sms.ir/v1/send/verify"

SMS_TEMPLATE_MAP = {
    "auth_register_otp": "SMS_AUTH_OTP_TEMPLATE_ID",
    "auth_login_otp": "SMS_AUTH_OTP_TEMPLATE_ID",
    "auth_reset_password_otp": "SMS_AUTH_OTP_TEMPLATE_ID",
    "auth_verify_mobile_otp": "SMS_AUTH_OTP_TEMPLATE_ID",
    "event_cancellation": "SMS_EVENT_CANCELLATION_TEMPLATE_ID",
    "event_reschedule": "SMS_EVENT_RESCHEDULE_TEMPLATE_ID",
    "payment_status": "SMS_PAYMENT_STATUS_TEMPLATE_ID",
}


def _template_id_for_kind(kind: str) -> str:
    setting_name = SMS_TEMPLATE_MAP.get(kind, "")
    return getattr(settings, setting_name, "") if setting_name else ""


def _send_sms(receptor: str, template_id: str | int, variables: list[dict] | None = None):
    headers = {
        "Content-Type": "application/json",
        "Accept": "application/json",
        "x-api-key": settings.SMS_APIKEY,
    }
    payload = {
        "mobile": receptor,
        "templateId": int(template_id),
        "parameters": variables or [],
    }
    response = requests.post(
        SMS_ENDPOINT,
        json=payload,
        headers=headers,
        timeout=10,
    )
    response.raise_for_status()
    return response


@shared_task(bind=True, max_retries=3)
def send_critical_sms(self, mobile: str, kind: str, code_or_message: str):
    try:
        template_id = _template_id_for_kind(kind)
        if not template_id or not settings.SMS_APIKEY:
            logger.info(
                "SMS skipped for mobile=%s kind=%s template=%s configured=%s payload=%s",
                mobile,
                kind,
                bool(template_id),
                bool(settings.SMS_APIKEY),
                code_or_message,
            )
            return {"mobile": mobile, "kind": kind, "sent": False}

        variables = [{"name": "OTP", "value": str(code_or_message)}]
        if kind in {"event_cancellation", "event_reschedule", "payment_status"}:
            variables = [{"name": "MESSAGE", "value": str(code_or_message)}]

        _send_sms(mobile, template_id, variables=variables)
        logger.info("SMS sent to %s for kind=%s", mobile, kind)
        return {"mobile": mobile, "kind": kind, "sent": True}
    except Exception as exc:
        logger.error("Failed to send SMS to %s for kind=%s: %s", mobile, kind, exc)
        raise self.retry(exc=exc, countdown=60)


@shared_task(bind=True, max_retries=1)
def send_verification_email(self, user_id, verification_url):
    logger.info("Legacy verification email task skipped for user=%s url=%s", user_id, verification_url)
    return {"skipped": True}


@shared_task(bind=True, max_retries=1)
def send_password_reset_email(self, user_id, reset_url):
    logger.info("Legacy password reset email task skipped for user=%s url=%s", user_id, reset_url)
    return {"skipped": True}


@shared_task(bind=True, max_retries=1)
def send_email_verified_success(self, user_id: int):
    logger.info("Legacy verification success email task skipped for user=%s", user_id)
    return {"skipped": True}