'use strict';

// modules
const fs = require('fs');
const mkdirp = require('mkdirp');
const express = require('express');
const multer = require('multer');
const storage = multer.memoryStorage();
const upload = multer({storage: storage});

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

// access check
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 resourceLocation = require('../middleware/resource-location').resourceLocation().concat('/logs/');

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

// Mongoose Model using mongoDB
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');
const LogServerFpsModel = require('../models/logs/server-fps');

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

const wars = new express.Router();

// routes **********************
wars.route('/')
    .get((req, res, next) => {
      const filter = {};
      if (req.query.campaignId) {
        filter.campaign = req.query.campaignId;
      }
      WarModel.find(filter, {}, {sort: {date: 'desc'}}, (err, wars) => {
        if (err) {
          err.status = codes.servererror;
          return next(err);
        }
        res.locals.items = wars;
        res.locals.processed = true;
        next();
      });
    })

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

        if (req.file) {
          fs.readFile(req.file.buffer, (file, err) => {
            if (err) {
              return next(err);
            }
            const lineArray = file.toString().split('\n');
            const statsResult = parseWarLog(lineArray, warBody);
            statsResult.war.save((err, war) => {
              if (err) {
                return next(err);
              }
              LogKillModel.create(statsResult.kills, () => {
                LogVehicleKillModel.create(statsResult.vehicles, () => {
                  LogRespawnModel.create(statsResult.respawn, () => {
                    LogReviveModel.create(statsResult.revive, () => {
                      LogFlagModel.create(statsResult.flag, () => {
                        LogBudgetModel.create(statsResult.budget, () => {
                          LogTransportModel.create(statsResult.transport, () => {
                            LogPlayerCountModel.create(statsResult.playerCount, () => {
                              LogPointsModel.create(statsResult.points, () => {
                                LogServerFpsModel.create(statsResult.serverFps, (err, serverPerformanceEntries) => {
                                  serverPerformanceEntries.forEach((entry) => {
                                    const idx = statsResult.players
                                                           .findIndex((player) => player.name === entry.entityName);
                                    if (idx !== -1) {
                                      const player = statsResult.players[idx];
                                      player['performance'] = entry._id;
                                      statsResult.players[idx] = player;
                                    }
                                  });
                                  PlayerModel.create(statsResult.players, (err) => {
                                    if (err) {
                                      return next(err);
                                    }
                                    const folderName = resourceLocation.concat(war._id);
                                    mkdirp(folderName, (err) => {
                                      if (err) return next(err);

                                      // save clean log file
                                      const cleanFile = fs.createWriteStream(folderName + '/clean.log');
                                      statsResult.clean.forEach((cleanLine) => {
                                        cleanFile.write(cleanLine + '\n\n');
                                      });
                                      cleanFile.end();

                                      // save raw log file
                                      const rawFile = fs.createWriteStream(folderName + '/war.log');
                                      lineArray.forEach((rawLine) => {
                                        rawFile.write(rawLine + '\n');
                                      });
                                      rawFile.end();

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

    .all(
      routerHandling.httpMethodNotAllowed
    );

wars.route('/:id')
    .get(idValidator, (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();
        });
      });
    })

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

    .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 linked appearances
        PlayerModel.find({warId: item._id}).remove().exec();
        LogKillModel.find({war: item._id}).remove().exec();
        LogVehicleKillModel.find({war: item._id}).remove().exec();
        LogRespawnModel.find({war: item._id}).remove().exec();
        LogReviveModel.find({war: item._id}).remove().exec();
        LogFlagModel.find({war: item._id}).remove().exec();
        LogBudgetModel.find({war: item._id}).remove().exec();
        LogTransportModel.find({war: item._id}).remove().exec();
        LogPointsModel.find({war: item._id}).remove().exec();
        LogPlayerCountModel.find({war: item._id}).remove().exec();

        // check if logfiles exist and delete from fs
        const warDir = resourceLocation + 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;