from sqlalchemy.orm import Session
from datetime import datetime
from typing import Optional
from fastapi import HTTPException
from app.modules.feed.models import Feed
from app.modules.feed.schema import FeedCreate, FeedResponse, FeedUpdate, messageResponse


class FeedService:
    @staticmethod
    def create_feed(db: Session, data: FeedCreate ):
        new_feed = Feed(**data.dict())
        db.add(new_feed)
        db.commit()
        db.refresh(new_feed)
        return new_feed

    @staticmethod
    def get_feed(db: Session, feed_id: int, current_user):
        feed = db.query(Feed).filter(Feed.id == feed_id).first()
        if not feed:
            raise ValueError("feed no encontrado")
        return feed

    @staticmethod
    def update_feed(db: Session, feed_id: int, data: FeedUpdate , current_user):
        feed = db.query(Feed).filter(Feed.id == feed_id).first()
        if not feed:
            raise ValueError("feed no encontrado")
        
        if current_user.role not in ["ROOT", "ADMIN"]:
            raise ValueError("No tienes permisos para actualizar este feed")
        
        update_data = data.dict(exclude_unset=True)
        for key, value in update_data.items():
            setattr(feed, key, value)
        
        db.commit()
        db.refresh(feed)
        return feed

    @staticmethod
    def delete_feed(db: Session, feed_id: int, current_user):
        feed = db.query(Feed).filter(Feed.id == feed_id).first()
        if not feed:
            raise ValueError("feed no encontrado")
        
        if current_user.role not in ["ROOT", "ADMIN"]:
            raise ValueError("No tienes permisos para eliminar este feed")
        
        try:
            feed.is_active = False
            feed.deleted_at = datetime.utcnow()
            feed.deleted_by = current_user.id
            db.commit()
            db.refresh(feed)
        except Exception as e:
            db.rollback()
            raise ValueError(f"Error al eliminar el feed: {e}")
        
        return {"message": "feed eliminado correctamente"}