middleware.js

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

// if button is not there it will give an error so add this
module.exports.isLoggedIn = (req, res , next) => {
    if (!req.isAuthenticated()) {
        const { id } = req.params
        req.session.returnTo = (!req.query._method ? req.originalUrl : `/campgrounds/${id}`);
        req.flash('error', 'You must be signed in first!');
        return res.redirect('/#');
      }
      next();
}

module.exports.checkReturnTo = (req, res, next) => {
    if (req.session.returnTo) {
      res.locals.returnTo = req.session.returnTo;
    }
    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)){
        req.flash('error', 'You dont 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)){
        req.flash('error', 'You dont 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();
    }
}