middleware.js

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


module.exports.isLoggedIn = (req, res, next) => {
    if (!req.isAuthenticated()) {
        // store the destination user want to reach into session
        // to redirect user after they log in 
        req.session.returnTo = req.originalUrl;
        req.flash('error', 'You must be signed in first!');
        return res.redirect('/login');
    }
    next();
}

module.exports.validateCampground = (req, res, next) => {
    const {error} = campgroundSchema.validate(req.body);
    if (error) {
        // join error msg to string
        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);
    // cannot update if current user is not the author
    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.isReviewAuthor = async (req, res, next) => {
    const { id, reviewId } = req.params;
    const review = await Review.findById(reviewId);
    // cannot update if current user is not the author
    if (!review.author.equals(req.user._id)) {
        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) {
        // join error msg to string
        const msg = error.details.map(el => el.message).join(',');
        throw new ExpressError(msg, 400);
    } else {
        next();
    }
}