middleware.js

const {campgroundSchema}=require('./schemas')
const ExpressError=require('./utils/ExpressError')
const Campground=require('./models/campground') 
const Review=require('./models/review')

module.exports.isLoggedIn=(req,res,next)=>{
    if(!req.isAuthenticated()){
       req.session.returnTo=req.originalUrl;
        req.flash('error','You must signed in');
       return res.redirect('/login')
     }
     next();
}


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



module.exports.isAuthor=async(req,res,next)=>{
   const {id}=req.params;
    const campground=await Campground.findById(id);
    if(!campground.author.equals(req.user._id)){
     req.flash('error',"You do not have permission for that.")
    return res.redirect(`/campgrounds/${id}`);
    }
    next();
}

module.exports.isReviewAuthor=async(req,res,next)=>{
    const {id,reviewId}=req.params;
     const review=await Review.findById(reviewId);
     if(!review.author.equals(req.user._id)){
      req.flash('error',"You do not have permission for that.")
     return res.redirect(`/campgrounds/${id}`);
     }
     next();
 }

module.exports.validateCampground=(req,res,next)=>{
  
    const {error}=campgroundSchema.validate(req.body);
     
    if(error){
        const msg=error.details.map(el=>el.message).join(",")
        throw new ExpressError(msg,400)
    }else{
        next();
    }

}