import {NextFunction, Request, Response} from 'express';
import * as fs from 'fs';
import { Config } from '../../common/config/private/Config';
import { GPXProcessing } from '../model/fileprocessing/GPXProcessing';

export class MetaFileMWs {
  public static async compressGPX(
    req: Request,
    res: Response,
    next: NextFunction
  ): Promise<void> {
    if (!req.resultPipe) {
      return next();
    }
    // if conversion is not enabled redirect, so browser can cache the full
    if (Config.Client.MetaFile.GPXCompressing.enabled === false) {
      return res.redirect(req.originalUrl.slice(0, -1 * '\\bestFit'.length));
    }
    const fullPath = req.resultPipe as string;

    const compressedGPX = GPXProcessing.generateConvertedPath(
      fullPath,
    );

    // check if converted photo exist
    if (fs.existsSync(compressedGPX) === true) {
      req.resultPipe = compressedGPX;
      return next();
    }

    if (Config.Server.MetaFile.GPXCompressing.onTheFly === true) {
      req.resultPipe = await GPXProcessing.compressGPX(fullPath);
      return next();
    }

    // not converted and won't be now
    return res.redirect(req.originalUrl.slice(0, -1 * '\\bestFit'.length));
  }
}