'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;

const fs = require('fs');
const resourceLocation = require('../middleware/resource-location').resourceLocation().concat('/logs/');

// Mongoose Model using mongoDB
const CampaignModel = require('../models/campaign');
const WarModel = require('../models/war');
const PlayerModel = require('../models/player');
const LogKillModel = require('../models/logs/kill');
const LogVehicleKillModel = require('../models/logs/vehicle');
const LogRespawnModel = require('../models/logs/respawn');
const LogReviveModel = require('../models/logs/revive');
const LogTransportModel = require('../models/logs/transport');
const LogFlagModel = require('../models/logs/flag');
const LogBudgetModel = require('../models/logs/budget');
const LogPointsModel = require('../models/logs/points');
const LogPlayerCountModel = require('../models/logs/player-count');

// util
const genericGetById = require('./_generic').genericGetById;
const genericPatch = require('./_generic').genericPatch;

const campaigns = new express.Router();

// routes **********************
campaigns.route('/')
         .get((req, res, next) => {
           CampaignModel.find({}, {}, {
             sort: {
               timestamp: 'desc',
             },
           }, (err, items) => {
             if (err) {
               err.status = codes.servererror;
               return next(err);
             }
             if (items && items.length > 0) {
               res.locals.items = items;
             } else {
               res.locals.items = [];
             }
             res.locals.processed = true;
             next();
           });
         })

         .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('/with/war/:id')
         .get((req, res, next) => {
           WarModel.findById(req.params.id, (err, item) => {
             if (err) {
               err.status = codes.servererror;
               return next(err);
             }
             return genericGetById({params: {id: item.campaign}}, res, next, CampaignModel);
           });
         })

         .all(
           routerHandling.httpMethodNotAllowed
         );

campaigns.route('/:id')
         .get(idValidator, (req, res, next) => {
           return genericGetById(req, res, next, CampaignModel);
         })

         .patch(apiAuthenticationMiddleware, checkMT, (req, res, next) => {
           return genericPatch(req, res, next, CampaignModel);
         })

         .delete((req, res, next) => {
           WarModel.find({campaign: req.params.id}, (err, wars) => {
             wars.forEach((item) => {
               // delete linked appearances
               PlayerModel.find({warId: item._id}).deleteMany();
               LogKillModel.find({war: item._id}).deleteMany();
               LogVehicleKillModel.find({war: item._id}).deleteMany();
               LogRespawnModel.find({war: item._id}).deleteMany();
               LogReviveModel.find({war: item._id}).deleteMany();
               LogFlagModel.find({war: item._id}).deleteMany();
               LogBudgetModel.find({war: item._id}).deleteMany();
               LogTransportModel.find({war: item._id}).deleteMany();
               LogPointsModel.find({war: item._id}).deleteMany();
               LogPlayerCountModel.find({war: item._id}).deleteMany();

               // check if logfiles exist and delete from fs
               const warDir = resourceLocation + item.id;
               if (fs.existsSync(warDir)) {
                 const cleanLog = warDir + '/clean.log';
                 if (fs.existsSync(cleanLog)) {
                   fs.unlink(cleanLog, (err) => {
                   });
                 }
                 const sourceLog = warDir + '/war.log';
                 if (fs.existsSync(sourceLog)) {
                   fs.unlink(sourceLog, (err) => {
                   });
                 }
                 fs.rmdir(warDir, (err) => {
                 });
               }
             });
             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);
               }
               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;