"use strict";

// modules
const fs = require('fs');
const mkdirp = require("mkdirp");
const {exec} = require('child_process');
const express = require('express');
const multer = require('multer');
const storage = multer.memoryStorage();
const upload = multer({storage: storage});
const logger = require('debug')('cc:wars');

// 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 parseWarLog = require('../tools/log-parse-tool');

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

const wars = express.Router();

// routes **********************
wars.route('/')
  .get((req, res, next) => {
    let result = [];
    CampaignModel.find({}, {}, {sort: {timestamp: 'desc'}}, (err, campaigns) => {
      if (err) {
        err.status = codes.servererror;
        return next(err);
      }
      if (campaigns) {
        WarModel.find({}, {}, {sort: {date: 'desc'}}, (err, wars) => {
            if (err) {
              err.status = codes.servererror;
              return next(err);
            }
            if (wars) {
              campaigns.forEach(campaign => {
                let entry = {_id: campaign._id, title: campaign.title, wars: []};
                wars.forEach((war) => {
                  if (String(campaign._id) === String(war.campaign)) {
                    entry.wars.push(war);
                  }
                });
                result.push(entry);
              });
              res.locals.items = result;
            }
            res.locals.processed = true;
            next();
          }
        )
        ;
      }
    })
  })

  .post(apiAuthenticationMiddleware, checkMT, upload.single('log'), (req, res, next) => {
    let body = req.body;
    const war = new WarModel(body);

    if (req.file) {
        fs.readFile(req.file.buffer, (file, err) => {
          if (err) {
            return next(err);
          }
          const lineArray = file.toString().split("\n");
          parseWarLog(lineArray, {});

        });
      res.locals.processed = true;
      return next();

    } else {
      const err = new Error('no Logfile provided');
      err.status = codes.wrongmediasend;
      next(err);
    }
  })

  .all(
    routerHandling.httpMethodNotAllowed
  );

wars.route('/:id')
  .get((req, res, next) => {
    WarModel.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);
      }
      PlayerModel.find({warId: item._id}, {}, {sort: {kill: 'desc'}}, (err, items) => {
        if (err) {
          return next(err);
        }

        const responseObj = item.toObject();
        responseObj.players = items;
        res.locals.items = responseObj;
        return next();
      });

    });
  })

  .delete(apiAuthenticationMiddleware, checkMT, (req, res, next) => {
    WarModel.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);
      }

      // delete players having this war ID as foreign key
      PlayerModel.find({warId: item._id}).remove().exec();

      // check if logfiles exist and delete from fs
      const warDir = __dirname + '/../resource/logs/' + req.params.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) => {
        });
      }
      // we don't set res.locals.items  and thus it will send a 204 (no content) at the end. see last handler user.use(..)
      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
wars.use(routerHandling.emptyResponse);

module.exports = wars;