middleware.js

const Campground = require('./models/campground');
const Review = require('./models/review');
const {campgroundSchema, reviewSchema} = require('./schemas');
const ExpressError = require('./utilities/ExpressError');

module.exports.validateCampground = (req,res,next) => {
    //JOI SCHEMA VALIDATION

   const {error} = campgroundSchema.validate(req.body);
   if(error){
       const msg = error.details.map(el => el.message).join(',');
       throw new ExpressError(msg,400);
   }
   else{
       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 to do that')
        return res.redirect(`/campgrounds/${id}`)
    }
    next();
}

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

module.exports.validateReview = (req, res, next) =>{
    const {error} = reviewSchema.validate(req.body);
    if(error){
        const msg = error.details.map(el => el.message).join(',');
        throw new ExpressError(msg, 400);
    }else{
        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 to do that')
        return res.redirect(`/campgrounds/${id}`)
    }
    next();
}