middleware.js

const{campgroundSchema, reviewSchema}=require('./schemas.js');
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 be signed in');
    return res.redirect('/login');
}
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();
    }
    
}

module.exports.isAuthor = async (req, res, next) =>{
    const{ id } = req.params;
    const campground =  await Campground.findById(id);
    if(!campground.author.equals(req.user.id)){
        //if the current user doesn't own the campground it flashes an error so they can't modify it
        req.flash('error', 'You do not have permission to do that');
        return res.redirect(`/campgrounds/${id}`);
    }
    next();
}
module.exports.isReviewAuthor = async (req, res, next) =>{
    const{id, reviewId } = req.params;
    const review=  await Review.findById(reviewId);
    if(!review.author.equals(req.user._id)){
        //if the current user doesn't own the campground it flashes an error so they can't modify it
        req.flash('error', 'You do not have permission to do that');
        return res.redirect(`/campgrounds/${id}`);
    }
    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();
    }
}