'use strict';

const express = require('express');
const next = require('next');
const fs = require('fs');
const path = require('path');
const sqlite3 = require('sqlite3').verbose();

const repositoryDirectory = './user-content-access/';
const dbFile = './gitcub.db';

const dev = process.env.NODE_ENV !== 'production';
const port = 3000;
const app = next({ dev });
const handle = app.getRequestHandler();

const directoryExists = (path) => fs.existsSync(path) ? fs.statSync(path).isDirectory() : false;

const repositoryExists = (name, rows) => (
  directoryExists(repositoryDirectory + name) && rows.some((x) => x.name === name)
);

app.prepare()
.then(() => {
  const server = express();

  const db = new sqlite3.Database(dbFile, sqlite3.OPEN_READWRITE);

  server.get('/api/*', (req, res) => {
    db.all('select name from repositories', (err, rows) => {
      if (req.originalUrl.indexOf('\0') === -1) {
        const pathNormalized = path.normalize(req.path);
        const pathArray = pathNormalized.split('/').filter((x) => x.length > 0);
        
        // remove 'api'
        pathArray.shift();
        
        const pathIsValid = (pathArray) => {
          if (pathArray.length > 0) {
            if (repositoryExists(pathArray[0], rows)) {
              if (directoryExists(repositoryDirectory + pathArray.join('/'))) {
                return true;
              } else return false;
            } else return false;
          } else return false;
        }
        
        if (pathIsValid(pathArray)) {
          const dirList = fs.readdirSync(
            repositoryDirectory + pathArray.join('/'),
            (err, files) => {
              if (err) {
                console.log(err);
              } else return files;
            }
          );

          res.json(dirList);
        } else res.json('Repository does not exist.');
      } else res.json('Null byte found in url. Nice try :)');
    });
  });

  server.get('*', (req, res) => {
    return handle(req, res);
  });

  server.listen(port, () => {
    console.log(`Example app listening on port ${port}`);
  });
})
.catch((ex) => {
  console.error(ex.stack);
  process.exit(1);
});