"use strict";

// modules
const fs = require('fs');
const express = require('express');
const logger = require('debug')('cc:signatures');

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

const routerHandling = require('../middleware/router-handling');

const UserModel = require('../models/user');

const signatures = express.Router();

// routes **********************
signatures.route('/:id')
  .get((req, res, next) => {
    // decode UTF8-escape sequences (special characters)
    const uri = decodeURIComponent(req.params.id);
    UserModel.findOne({username: uri}, (err, user) => {

      const emptyFile = 'resource/signature/0.png';
      if (user === null) {
        res.sendFile(emptyFile, {root: __dirname + '/../'});
      } else {
        const file = 'resource/signature/' + user._id + '.png';

        fs.stat(__dirname + '/../' + file, (err, stat) => {
          if (err === null) {
            res.sendFile(file, {root: __dirname + '/../'});
          } else if (err.code === 'ENOENT') {
            res.sendFile(emptyFile, {root: __dirname + '/../'});
          } else {
            err = new Error("Internal server error");
            err.status = codes.servererror;
            return next(err);
          }
        });

      }

    })
  })

  .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
signatures.use(routerHandling.emptyResponse);


module.exports = signatures;