'use strict';

// modules
const express = require('express');

// HTTP status codes by name
const codes = require('./http-codes');

const apiAuthenticationMiddleware = require('../middleware/auth-middleware');
const checkMT = require('../middleware/permission-check').checkMT;

const routerHandling = require('../middleware/router-handling');
const idValidator = require('../middleware/validators').idValidator;

// Mongoose Model using mongoDB
const CampaignModel = require('../models/campaign');
const WarModel = require('../models/war');

const campaigns = new express.Router();

// routes **********************
campaigns.route('/')
         .post(apiAuthenticationMiddleware, checkMT, (req, res, next) => {
           const campaign = new CampaignModel(req.body);
           // timestamp and default are set automatically by Mongoose Schema Validation
           campaign.save((err) => {
             if (err) {
               err.status = codes.wrongrequest;
               err.message += ' in fields: ' + Object.getOwnPropertyNames(err.errors);
               return next(err);
             }
             res.status(codes.created);
             res.locals.items = campaign;
             next();
           });
         })

         .all(
           routerHandling.httpMethodNotAllowed
         );

campaigns.route('/:id')
         .get(idValidator, (req, res, next) => {
           CampaignModel.findById(req.params.id, (err, item) => {
             if (err) {
               err.status = codes.servererror;
               return next(err);
             } else if (!item) {
               err = new Error('item not found');
               err.status = codes.notfound;
               return next(err);
             }
             res.locals.items = item;
             return next();
           });
         })

         .patch(apiAuthenticationMiddleware, checkMT, (req, res, next) => {
           if (!req.body || (req.body._id && req.body._id !== req.params.id)) {
             // little bit different as in PUT. :id does not need to be in data, but if the _id and url id must match
             const err = new Error('id of PATCH resource and send JSON body are not equal ' + req.params.id + ' ' +
               req.body._id);
             err.status = codes.notfound;
             next(err);
             return; // prevent node to process this function further after next() has finished.
           }

           req.body.updatedAt = new Date();
           req.body.$inc = {__v: 1};
           if (req.body.hasOwnProperty('__v')) {
             delete req.body.__v;
           }

           // PATCH is easier with mongoose than PUT. You simply update by all data that comes from outside. no need to
           // reset attributes that are missing.
           CampaignModel.findByIdAndUpdate(req.params.id, req.body, {new: true}, (err, item) => {
             if (err) {
               err.status = codes.wrongrequest;
             } else if (!item) {
               err = new Error('item not found');
               err.status = codes.notfound;
             } else {
               res.locals.items = item;
             }
             next(err);
           });
         })

         .delete((req, res, next) => {
           CampaignModel.findByIdAndRemove(req.params.id, (err, item) => {
             if (err) {
               err.status = codes.wrongrequest;
               return next(err);
             } else if (!item) {
               err = new Error('item not found');
               err.status = codes.notfound;
               return next(err);
             }
             WarModel.find({campaign: req.params.id}).remove().exec();
             // TODO: remove all the war logs from fs here!!!
             res.locals.processed = true;
             next();
           });
         })

         .all(
           routerHandling.httpMethodNotAllowed
         );

// this middleware function can be used, if you like or remove it
// it looks for object(s) in res.locals.items and if they exist, they are send to the client as json
campaigns.use(routerHandling.emptyResponse);

module.exports = campaigns;