middleware.js

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

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