from datetime import date
from fastapi import APIRouter, Depends, HTTPException, Query, status
from sqlalchemy.orm import Session
from app.auth.dependencies import get_current_user
from app.database import get_db
from app.models.calendar import CalendarEvent
from app.models.user import User
from app.schemas.calendar import CalendarEventCreate, CalendarEventUpdate, CalendarEventOut

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


@router.get("", response_model=list[CalendarEventOut])
def list_events(
    date_from: date | None = None,
    date_to: date | None = None,
    is_completed: bool | None = None,
    category_id: int | None = None,
    limit: int = Query(100, le=500),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    q = db.query(CalendarEvent).filter(CalendarEvent.user_id == current_user.id)
    if date_from:
        q = q.filter(CalendarEvent.event_date >= date_from)
    if date_to:
        q = q.filter(CalendarEvent.event_date <= date_to)
    if is_completed is not None:
        q = q.filter(CalendarEvent.is_completed == is_completed)
    if category_id:
        q = q.filter(CalendarEvent.category_id == category_id)
    return q.order_by(CalendarEvent.event_date, CalendarEvent.event_time).limit(limit).all()


@router.get("/{event_id}", response_model=CalendarEventOut)
def get_event(event_id: int, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
    obj = db.get(CalendarEvent, event_id)
    if not obj or obj.user_id != current_user.id:
        raise HTTPException(status_code=404, detail="Event not found")
    return obj


@router.post("", response_model=CalendarEventOut, status_code=status.HTTP_201_CREATED)
def create_event(body: CalendarEventCreate, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
    obj = CalendarEvent(**body.model_dump(), user_id=current_user.id)
    db.add(obj)
    db.commit()
    db.refresh(obj)
    return obj


@router.patch("/{event_id}", response_model=CalendarEventOut)
def update_event(
    event_id: int, body: CalendarEventUpdate,
    db: Session = Depends(get_db), current_user: User = Depends(get_current_user)
):
    obj = db.get(CalendarEvent, event_id)
    if not obj or obj.user_id != current_user.id:
        raise HTTPException(status_code=404, detail="Event not found")
    for field, value in body.model_dump(exclude_none=True).items():
        setattr(obj, field, value)
    db.commit()
    db.refresh(obj)
    return obj


@router.delete("/{event_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_event(event_id: int, db: Session = Depends(get_db), current_user: User = Depends(get_current_user)):
    obj = db.get(CalendarEvent, event_id)
    if not obj or obj.user_id != current_user.id:
        raise HTTPException(status_code=404, detail="Event not found")
    db.delete(obj)
    db.commit()