const mongoose = require('mongoose');
const Reservation = require('../models/reservation');
const Book = require('../models/book');
const BookController = require('../controllers/books');


exports.reservations_get_all =  (req, res, next) => {
    Reservation.find()
    .select('book quantity _id')
    //.populate('book')         //ten populate nie działa
    .exec()
    .then(docs => {
        res.status(200).json({
            count: docs.length,
            reservations: docs.map(doc => {
                return{
                    _id: doc._id,
                    book: doc.bookId,
                    quantity: doc.quantity,
                    request: {
                        type: 'GET',
                        url: 'http://localhost:3000/reservations/' + doc._id
                    }
                }
            }),

        });
    })
    .catch(err=>{
        res.status(500).json({
            error: err
        });
    });
}
exports.reservations_create_reservation =  (req, res, next) => {
    Book.findById(req.body.bookId)
    .then(book=>{
        if(!book){
            return res.status(404).json({
                message: "Book not found"
            });
        }
        if(book.isHired == 1){
            return res.status(439).json({
                message: "Book is already reserved"
            });
        }
        const reservation = new Reservation({
            _id: mongoose.Types.ObjectId(),
            quantity: req.body.quantity,
            book: req.body.bookId
        });
        return reservation
            .save()
    })

    .then(result => {
        console.log(result);
        Book.findOneAndUpdate({_id: req.body._id},{$set:{isHired: 1}})
        .exec();
        res.status(201).json({
            message: 'Reservation stored',
            createdReservatrion:{
                _id: result._id,
                book: result.book,
                quantity: result.quantity
            },
            request: {
                type: 'GET',
                url: 'http://localhost:3000/reservations/' + result._id
            }
        });
    })
    .catch(err => {
    console.log(err);
    res.status(500).json({
        error: err
    });
    });
}

exports.reservations_get_reservation =  (req, res, next) => {
    Reservation.findById(req.params.reservationId)
    .populate('book')
    .exec()
    .then(reservation => {
        if(!reservation){
            return res.status(404).json({
                message: 'Reservation not found'
            });
        }
        res.status(200).json({
            reservation: reservation,
            request: {
                type: 'GET',
                url: 'http://localhost:3000/reservations'
            }
        });
    })
    .catch(err=>{
        res.status(500).json({
            error:err
        });
    });
}

exports.reservations_delete_reservation =  (req, res, next) => {
    Reservation.remove({_id: req.params.reservationId})
    .exec()
    .then(result =>{
        res.status(200).json({
            message: 'Reservation deleted',
            request: {
                type: 'POST',
                url: "http://localhost:3000/reservations" ,
                body: {bookId: 'ID', quantity: 'Number'}
            }
        });
    })
    .catch(err=>{
        res.status(500).json({
            error:err
        });
    });
}