middleware.js

const Listing = require("./models/listing");
const Review = require("./models/review.js");
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._id.equals(res.locals.currUser._id)){
        req.flash("error", "You are not authorized to edit this listing!");
        return res.redirect(`/listings/${id}`);
    }
    next();
}

module.exports.validateSchema = (req, res, next) => {
    let { err } = listingSchema.validate(req.body);
  
    if (err) {
      let errMsg = err.details.map((el) => el.message).join(",");
      throw new ExpressError(404, errMsg);
    } else {
      next();
    }
};


module.exports.validateReview = (req , res , next) => {
    let {err} = reviewSchema.validate(req.body);
    
    if(err){
        let errMsg = err.details.map((el) => el.message).join(',');
        throw new ExpressError(404 , errMsg);
    } else {
        next();
    }
};

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