import logging
from dataclasses import dataclass
from uuid import uuid4

import requests
from django.conf import settings

from apps.core.models import VoipConfiguration


logger = logging.getLogger(__name__)


@dataclass(frozen=True)
class VoipCallResult:
    success: bool
    error: str = ""


def place_voip_call(*, agent, customer, method):
    configuration = VoipConfiguration.load()
    if not configuration.voip_call_url:
        return VoipCallResult(False, "VOIP_CALL_URL تنظیم نشده است.")

    payload = {
        "method": method,
        "customer_number": customer.local_mobile,
        "metadata": {
            "agent_id": str(agent.public_id),
            "customer_id": str(customer.public_id),
        },
    }
    if method == "ip_phone" and agent.voip_extension:
        payload["agent_extension"] = agent.voip_extension
        key_prefix = "internal"
    elif method == "mobile" and agent.voip_local_mobile:
        payload["agent_mobile"] = agent.voip_local_mobile
        key_prefix = "mobile"
    else:
        return VoipCallResult(False, "روش تماس انتخاب‌شده در دسترس نیست.")

    try:
        response = requests.post(
            configuration.voip_call_url,
            json=payload,
            headers={"Idempotency-Key": f"{key_prefix}-{uuid4().hex}"},
            timeout=settings.INTEGRATION_HTTP_TIMEOUT_SECONDS,
        )
        response.raise_for_status()
        if response.content:
            body = response.json()
            if not isinstance(body, dict) or body.get("success") is False:
                return VoipCallResult(False, "سرویس تماس درخواست را نپذیرفت.")
        return VoipCallResult(True)
    except (requests.RequestException, ValueError):
        logger.exception("VOIP click-to-call failed")
        return VoipCallResult(False, "خطا در ارتباط با سرویس تماس.")