import express, { Express, NextFunction, Request, Response } from 'express';

import { HttpStatusException } from '../../common/lib/http-status.exception';
import { Logger } from '../../common/util/logger.class';

import { Collector } from './collector.class';

export class Webserver {
  private app: Express;

  constructor(private port: number, private collector: Collector) {
    this.app = express();

    this.app.get('/', async (req, res, next) => {
      try {
        const hdl = await this.collector.trx.start();
        if (!hdl) {
          return res.send({ hdl: null, data: [] });
        }
        const data = await this.collector.trx.read();

        res.send({
          hdl,
          data
        });
      } catch (err) {
        next(err);
      }
    });

    this.app.patch('/:hdl', async (req, res, next) => {
      try {
        const hdl = Number(req.params.hdl);
        await this.collector.trx.commit(hdl);

        res.send({ ok: true });
      } catch (err) {
        next(err);
      }
    });

    this.app.delete('/:hdl', async (req, res, next) => {
      try {
        const hdl = Number(req.params.hdl);
        await this.collector.trx.rollback(hdl);

        res.send({ ok: true });
      } catch (err) {
        next(err);
      }
    });

    this.app.use((err: any, req: Request, res: Response, next: NextFunction) => {
      if (err instanceof HttpStatusException) {
        res.status(err.statusCode).send(err.message);
      } else {
        Logger.error('[ERROR] Webservice ErrorHandler caught:', err);
        res.status(500).send(JSON.stringify(err));
      }
    });

    this.app.listen(this.port, () => {
      Logger.info(`[INFO] Monitoring Daemon Webservice started at http://localhost:${this.port}`);
    });
  }
}