from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel
from typing import Optional
import uuid

from bd import Settings
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

from bd.tables.question import Question
from bd.tables.poll import Poll
from route.auth_utils import get_current_user

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


class QuestionCreate(BaseModel):
    poll_id: str
    text: str
    type: Optional[str] = "single"
    position: Optional[int]


class QuestionUpdate(BaseModel):
    text: Optional[str]
    type: Optional[str]
    position: Optional[int]


def get_session():
    settings = Settings()
    engine = create_engine(settings.DATABASE_URL_syncpg, future=True)
    return sessionmaker(bind=engine, future=True)


@router.post("/", status_code=201)
def create_question(payload: QuestionCreate, _: object = Depends(get_current_user)):
    Session = get_session()
    try:
        pid = uuid.UUID(payload.poll_id)
    except Exception:
        raise HTTPException(status_code=400, detail="Invalid poll UUID")
    with Session() as session:
        poll = session.get(Poll, pid)
        if not poll:
            raise HTTPException(status_code=404, detail="Poll not found")
        q = Question(poll_id=pid, text=payload.text, type=payload.type or "single", position=payload.position)
        session.add(q)
        session.commit()
        session.refresh(q)
        return {"id": str(q.id)}


@router.put("/{question_id}")
def update_question(question_id: str, payload: QuestionUpdate, _: object = Depends(get_current_user)):
    Session = get_session()
    try:
        qid = uuid.UUID(question_id)
    except Exception:
        raise HTTPException(status_code=400, detail="Invalid UUID")
    with Session() as session:
        q = session.get(Question, qid)
        if not q:
            raise HTTPException(status_code=404, detail="Question not found")
        if payload.text is not None:
            q.text = payload.text
        if payload.type is not None:
            q.type = payload.type
        if payload.position is not None:
            q.position = payload.position
        session.add(q)
        session.commit()
        session.refresh(q)
        return {"id": str(q.id)}


@router.delete("/{question_id}", status_code=204)
def delete_question(question_id: str, _: object = Depends(get_current_user)):
    Session = get_session()
    try:
        qid = uuid.UUID(question_id)
    except Exception:
        raise HTTPException(status_code=400, detail="Invalid UUID")
    with Session() as session:
        q = session.get(Question, qid)
        if not q:
            raise HTTPException(status_code=404, detail="Question not found")
        session.delete(q)
        session.commit()
        return {}


@router.get("/")
def list_questions(poll_id: Optional[str] = None):
    Session = get_session()
    with Session() as session:
        q = session.query(Question)
        if poll_id:
            try:
                pid = uuid.UUID(poll_id)
                q = q.filter(Question.poll_id == pid)
            except Exception:
                raise HTTPException(status_code=400, detail="Invalid poll_id UUID")
        rows = q.all()
        return [{"id": str(r.id), "text": r.text, "poll_id": str(r.poll_id)} for r in rows]


@router.get("/{question_id}")
def get_question(question_id: str):
    Session = get_session()
    try:
        qid = uuid.UUID(question_id)
    except Exception:
        raise HTTPException(status_code=400, detail="Invalid UUID")
    with Session() as session:
        q = session.get(Question, qid)
        if not q:
            raise HTTPException(status_code=404, detail="Question not found")
        return {"id": str(q.id), "text": q.text, "poll_id": str(q.poll_id)}