from datetime import datetime, timedelta, timezone
from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel
from sqlmodel import Session, select

from app.core.db import get_session
from app.models import GoogleAccount, AuditLog
from app.google.client import get_service

router = APIRouter()

class CreateEventIn(BaseModel):
    title: str = "Reunión"
    minutes_from_now: int = 10
    duration_minutes: int = 60
    timezone: str = "America/Lima"
    attendees: list[str] = []

def get_account(session: Session, email: str) -> GoogleAccount:
    acc = session.exec(select(GoogleAccount).where(GoogleAccount.email == email)).first()
    if not acc:
        raise HTTPException(status_code=404, detail="Cuenta no autorizada. Primero usa /auth/google/start.")
    return acc

@router.post("/events")
def create_event(payload: CreateEventIn, account_email: str, session: Session = Depends(get_session)):
    acc = get_account(session, account_email)
    cal = get_service("calendar", "v3", acc.token_json)

    # Usamos ISO con timezone local (Google acepta timeZone separado)
    start_dt = datetime.now(timezone.utc) + timedelta(minutes=payload.minutes_from_now)
    end_dt = start_dt + timedelta(minutes=payload.duration_minutes)

    event = {
        "summary": payload.title,
        "start": {"dateTime": start_dt.isoformat(), "timeZone": payload.timezone},
        "end": {"dateTime": end_dt.isoformat(), "timeZone": payload.timezone},
        "attendees": [{"email": a} for a in payload.attendees],
        "conferenceData": {
            "createRequest": {
                "requestId": f"meet-{int(datetime.utcnow().timestamp())}",
                "conferenceSolutionKey": {"type": "hangoutsMeet"},
            }
        }
    }

    try:
        created = cal.events().insert(
            calendarId="primary",
            body=event,
            conferenceDataVersion=1,
            sendUpdates="all" if payload.attendees else "none",
        ).execute()

        meet_link = created.get("hangoutLink")
        session.add(AuditLog(account_email=account_email, action="calendar_create_event", detail=f"meet={meet_link}"))
        session.commit()

        return {
            "status": "created",
            "eventId": created.get("id"),
            "htmlLink": created.get("htmlLink"),
            "meetLink": meet_link,
        }
    except Exception as e:
        raise HTTPException(status_code=400, detail=str(e))