"""Public Talk-to-Sales endpoint — no auth required.

POST /api/v1/sales-leads
  - Inserts a sales_leads row.
  - Fires (best-effort) a notification email to settings.SALES_LEAD_RECIPIENT_EMAIL.
  - Emits a server-side PostHog event (best-effort).
  - Rate-limited per IP (5/hour).
"""

from __future__ import annotations

import asyncio
import logging
from typing import Annotated

from fastapi import APIRouter, Depends, Request
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.admin_database import get_admin_db
from app.core.config import settings
from app.core.email import EmailService
from app.core.rate_limit import limiter
from app.models.sales_lead import SalesLead
from app.schemas.sales_lead import SalesLeadCreate, SalesLeadCreateResponse

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/sales-leads", tags=["sales"])


async def _send_notification_email(lead: SalesLead) -> None:
    """Fire-and-forget wrapper. EmailService methods never raise, but we
    still wrap in a try/except to defend against future regressions."""
    try:
        await EmailService.send_sales_lead_notification(
            to_email=settings.SALES_LEAD_RECIPIENT_EMAIL,
            lead=lead,
        )
    except Exception:
        logger.warning(
            "Sales lead notification email failed for lead %s",
            lead.id,
            exc_info=True,
        )


def _capture_posthog_event(lead: SalesLead) -> None:
    """Emit `talk_to_sales_form_submitted` server-side. Best-effort.

    Backend PostHog SDK isn't initialized in the project today; this function
    is the single instrumentation point so wiring it up later is a one-line
    change. The call is wrapped so any future failure can never fail the
    request.
    """
    try:
        # Lazy import — keeps the dependency optional. When the backend
        # PostHog client is wired in (likely as `app.core.analytics.posthog`),
        # swap the import path here and the event will fire automatically.
        try:
            from app.core.analytics import posthog  # type: ignore[attr-defined]
        except ImportError:
            logger.debug(
                "PostHog server-side capture skipped — client not configured"
            )
            return

        distinct_id = lead.posthog_distinct_id or f"sales_lead:{lead.id}"
        posthog.capture(
            distinct_id=distinct_id,
            event="talk_to_sales_form_submitted",
            properties={
                "source": lead.source,
                "company": lead.company,
                "team_size": lead.team_size,
            },
        )
    except Exception:
        logger.warning(
            "PostHog capture failed for sales lead %s",
            lead.id,
            exc_info=True,
        )


@router.post("", response_model=SalesLeadCreateResponse, status_code=201)
@limiter.limit("5/hour")
async def create_sales_lead(
    request: Request,
    data: SalesLeadCreate,
    db: Annotated[AsyncSession, Depends(get_admin_db)],
) -> SalesLeadCreateResponse:
    """Public Talk-to-Sales submission.

    Creates a sales_leads row, fires (best-effort) a notification email and a
    server-side PostHog event. Rate-limited per IP at 5/hour.
    """
    lead = SalesLead(
        email=str(data.email).lower(),
        name=data.name,
        company=data.company,
        team_size=data.team_size,
        message=data.message,
        source=data.source,
        posthog_distinct_id=data.posthog_distinct_id,
    )
    db.add(lead)
    await db.commit()
    await db.refresh(lead)

    # Fire-and-forget: email + analytics. Failures must not fail the request.
    asyncio.create_task(_send_notification_email(lead))
    _capture_posthog_event(lead)

    return SalesLeadCreateResponse(id=lead.id, status="received")