'use strict';

const express = require('express');
const path = require('path');
const favicon = require('serve-favicon');
const bodyParser = require('body-parser');
const requestLogger = require('morgan');

// logger
const debug = require('debug');
const error = debug('cc:server:err');
const logger = debug('cc:server');
logger.log = console.log.bind(console);

const cors = require('cors');
const mongoose = require('mongoose');
const {exec} = require('child_process');

// cluster mode
const cluster = require('cluster');
const envWorkerNum = process.env.NODE_WORKER_COUNT;
const cpuCount = require('os').cpus().length;
const numWorkers = (envWorkerNum) ? envWorkerNum : cpuCount;

// own modules
const config = require('./config/config');
const urls = require('./config/api-url');
const restAPIchecks = require('./middleware/request-checks.js');
const errorResponseWare = require('./middleware/error-response');
const apiAuthenticationMiddleware = require('./middleware/auth-middleware');
const checkAdmin = require('./middleware/permission-check').checkAdmin;
const signatureCronJob = require('./cron-job/cron').cronJobSignature;
const backupCronJob = require('./cron-job/cron').cronJobBackup;

// router modules
const authenticateRouter = require('./routes/authenticate');
const accountRouter = require('./routes/account');
const overviewRouter = require('./routes/overview');
const userRouter = require('./routes/users');
const squadRouter = require('./routes/squads');
const rankRouter = require('./routes/ranks');
const decorationRouter = require('./routes/decorations');
const awardingRouter = require('./routes/awardings');
const requestRouter = require('./routes/request');
const playerRouter = require('./routes/players');
const signatureRouter = require('./routes/signatures');
const commandRouter = require('./routes/command');
const campaignRouter = require('./routes/campaigns');
const warRouter = require('./routes/wars');
const logRouter = require('./routes/logs');

// Configuration ***********************************
// mongoose promise setup
mongoose.Promise = global.Promise;

// app creation
const app = express();

// Middlewares *************************************************

// setup CORS-middleware
const corsOptions = {
  methods: ['GET'],
  optionsSuccessStatus: 200,
};

app.use(cors(corsOptions));

app.use(favicon(path.join(__dirname + '/..', 'public', 'favicon.ico')));
app.use(express.static(path.join(__dirname + '/..', 'public')));
app.use(bodyParser.json({limit: '10mb'}));
app.use(bodyParser.urlencoded({limit: '10mb', extended: true}));

// API request checks for API-version and JSON etc.
app.use(restAPIchecks);

// Routes ******************************************************
app.use(urls.signatures, signatureRouter);

// initialize logging at this point to exclude /signature requests
if (process.env.NODE_ENV === config.dev.env) {
  // development logging
  app.use(requestLogger('dev'));
} else if (process.env.NODE_ENV !== config.test.dredd.env && process.env.NODE_ENV !== config.test.unit.env) {
  // production logging, apache style
  app.use(requestLogger(':date[clf] :method :url :response-time ms :status'));
}

app.use(urls.auth, authenticateRouter);
app.use(urls.overview, overviewRouter);
app.use(urls.users, userRouter);
app.use(urls.squads, squadRouter);
app.use(urls.ranks, rankRouter);
app.use(urls.decorations, decorationRouter);
app.use(urls.request, requestRouter);
app.use(urls.awards, awardingRouter);
app.use(urls.wars, warRouter);
app.use(urls.players, playerRouter);
app.use(urls.campaigns, campaignRouter);
app.use(urls.logs, logRouter);
app.use(urls.command, apiAuthenticationMiddleware, checkAdmin, commandRouter);
app.use(urls.account, apiAuthenticationMiddleware, checkAdmin, accountRouter);

// send index.html on all different paths
app.use((req, res) => {
  res.sendFile('public/index.html', {root: __dirname + '/..'});
});

// register error handlers
errorResponseWare(app);

// Start the server
if (process.env.NODE_ENV === config.test.unit.env || process.env.NODE_ENV === config.test.dredd.env) {
  const MongodbMemoryServer = require('mongodb-memory-server').default;
  const mongoServer = new MongodbMemoryServer();
  mongoose.Promise = Promise;
  mongoServer.getConnectionString().then((mongoUri) => {
    mongoose.connect(mongoUri, {useNewUrlParser: true});

    mongoose.connection.on('error', (e) => {
      if (e.message.code === 'ETIMEDOUT') {
        error(e);
        mongoose.connect(mongoUri);
      }
      error(e);
    });

    if (process.env.NODE_ENV === config.test.dredd.env) {
      const mongoPortAndDB = mongoUri.replace('mongodb://localhost:', '').split('/');
      exec(
        __dirname + '/apib/dredd/populate-data.sh'
        .concat(' -p ').concat(mongoPortAndDB[0])
        .concat(' -d ').concat(mongoPortAndDB[1]), (err, stdout, stderr) => {
          if (err) {
            error(err.message);
          } else {
            logger('\x1b[32m%s\x1b[0m', stderr);
          }
        });
    }

    mongoose.connection.once('open', () => {
      logger(`MongoDB successfully connected to ${mongoUri}`);
      app.listen(config.test.port);
      logger('Listening on port ' + config.test.port);
    });
  });
} else {
  mongoose.connect(config.database.uri + config.database.db, {useNewUrlParser: true}).then((db) => {
    let cronWorkerPID;
    if (cluster.isMaster) {
      // Fork workers
      for (let i = 0; i < numWorkers; i++) {
        if (i === 0) {
          const spawnedWorker = cluster.fork({START_CRON: true});
          cronWorkerPID = spawnedWorker.process.pid;
        } else {
          cluster.fork();
        }
      }
      logger(`Master ${process.pid} is running. Forking ${numWorkers} workers`);

      // Check if worker id is died
      cluster.on('exit', (worker, code, signal) => {
        logger(`worker ${worker.process.pid} died`);
        if (worker.process.pid === cronWorkerPID) {
          const spawnedWorker = cluster.fork({START_CRON: true});
          cronWorkerPID = spawnedWorker.process.pid;
        } else {
          cluster.fork();
        }
      });
    } else {
      app.listen(config.port, (err) => {
        if (err) {
          error(`Error on startup ${err}`);
        } else {
          logger(`Worker ${process.pid} started. Listening on port ${config.port}`);
          if (process.env.START_CRON) {
            logger(`Attaching cronJobs to cluster worker ${process.pid}`);
            signatureCronJob.start();
            backupCronJob.start();
          }
        }
      });
    }
  });
}

module.exports = app;