'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) => {
  return directoryExists(repositoryDirectory + name) &&
  rows.some(x => x.name == name)
}

app.prepare()
.then(() => {

  const server = express()

  var 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) {
        
        let pathNormalized = path.normalize(req.path)

        let pathArray = pathNormalized.split('/').filter((x) => x.length > 0)
        pathArray.shift() // remove 'api'
        
        let 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)) {
          
          var 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)
})