middleware.js

const Listing = require("./models/listing");
const Review = require ("./models/review.js");
const {listingSchema , reviewSchema}= require("./schema.js");
const ExpressError=require("./utils/ExpressError.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 a post");
      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._id.equals(res.locals.currUser._id)){
    req.flash("error","You don't have permission to edit");
    return res.redirect(`/listing/${id}`);
  }
  next();
};


module.exports.validateListing = (req,res,next)=>{
  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 don't have permission");
    return res.redirect(`/listings/${id}`);
  }
  next();
};