import io

import qrcode
from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.responses import StreamingResponse
from sqlalchemy.orm import Session

from api.auth import require_api_key
from config import settings
from db.database import get_db
from schemas import ContactCreate, ContactResponse, ContactUpdate
from services import contact_service

router = APIRouter(prefix="/contacts", tags=["contacts"])


@router.get("/", response_model=list[ContactResponse])
def list_contacts(db: Session = Depends(get_db), _: str = Depends(require_api_key)):
    return contact_service.get_all(db)


@router.post("/", response_model=ContactResponse, status_code=status.HTTP_201_CREATED)
def create_contact(
    data: ContactCreate,
    db: Session = Depends(get_db),
    _: str = Depends(require_api_key),
):
    return contact_service.create(db, data)


@router.get("/{contact_id}", response_model=ContactResponse)
def get_contact(
    contact_id: str,
    db: Session = Depends(get_db),
    _: str = Depends(require_api_key),
):
    contact = contact_service.get_by_id(db, contact_id)
    if not contact:
        raise HTTPException(status_code=404, detail="Contact not found")
    return contact


@router.put("/{contact_id}", response_model=ContactResponse)
def update_contact(
    contact_id: str,
    data: ContactUpdate,
    db: Session = Depends(get_db),
    _: str = Depends(require_api_key),
):
    contact = contact_service.get_by_id(db, contact_id)
    if not contact:
        raise HTTPException(status_code=404, detail="Contact not found")
    return contact_service.update(db, contact, data)


@router.delete("/{contact_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_contact(
    contact_id: str,
    db: Session = Depends(get_db),
    _: str = Depends(require_api_key),
):
    contact = contact_service.get_by_id(db, contact_id)
    if not contact:
        raise HTTPException(status_code=404, detail="Contact not found")
    contact_service.delete(db, contact)


@router.get("/{contact_id}/telegram-qr", tags=["contacts"])
def telegram_qr(
    contact_id: str,
    db: Session = Depends(get_db),
    _: str = Depends(require_api_key),
):
    """QR-Code als PNG: Invite-Link für Telegram-Bot mit Kontakt-ID als Deep-Link-Parameter."""
    contact = contact_service.get_by_id(db, contact_id)
    if not contact:
        raise HTTPException(status_code=404, detail="Contact not found")

    bot_username = settings.telegram_bot_username.lstrip("@")
    invite_url = f"https://t.me/{bot_username}?start={contact_id}"

    img = qrcode.make(invite_url)
    buf = io.BytesIO()
    img.save(buf, format="PNG")
    buf.seek(0)
    return StreamingResponse(
        buf,
        media_type="image/png",
        headers={"Content-Disposition": f'attachment; filename="telegram_qr_{contact_id}.png"'},
    )