middleware.js

const Listing=require("./models/listing");
const Review=require("./models/review");
const ExpressError = require("./utils/ExpressError.js");
const { listingSchema,reviewSchema  } = require("./schema.js");


module.exports.isLoggedIn=(req,res,next)=>{
    if(!req.isAuthenticated()){
        req.session.redirectUrl=req.originalUrl;
        req.flash("error","You must be logged in to create new listing");
       return  res.redirect("/login");
      }
      next();
};

module.exports.saveRedirectUrl=(req,res,next)=>{
    if(req.session.redirectUrl){
        res.locals.redirectUrl=req.session.redirectUrl;
    }
    next();
};

module.exports.isOwner=async (req,res,next)=>{
    let { id } = req.params;
    let listing= await Listing.findById(id);
    if(!listing.owner.equals(res.locals.currUser._id)){
      req.flash("error","You are not the owner of this listing");
     return  res.redirect(`/listings/${id}`);
    }
    next();
}

module.exports. validateListing =  (req, res, next) => {   //joe validation for server side validation
    let { error } = listingSchema.validate(req.body);
    if (error) {
      let errMsg = error.details.map((el) => el.message).join(",");
      throw new ExpressError(400, errMsg);
    } else {
      next();
    }
  };

 module.exports.validateReview =  (req, res, next) => {
    let { error } = reviewSchema.validate(req.body);
    if (error) {
      let errMsg = error.details.map((el) => el.message).join(",");
      throw new ExpressError(400, errMsg);
    } else {
      next();
    }
  };
  

  module.exports.isReviewAuthor=async (req,res,next)=>{
    let { id,reviewId } = req.params;
    let review= await Review.findById(reviewId);
    if(!review.author.equals(res.locals.currUser._id)){
      req.flash("error","You are not the author of this review");
     return  res.redirect(`/listings/${id}`);
    }
    next();
}