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path: root/server/api/backends.js
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/* global __appdir */
const path = require('path')
const ExternalBackends = require(path.join(__appdir, 'lib', 'external-backends'))
var db = require(path.join(__appdir, 'lib', 'sequelize'))
var express = require('express')
var router = express.Router()

// GET requests.

/*
 * @return: Returns a list of all backends saved in the db.
 */
router.get('/', (req, res) => {
  db.backend.findAll({
    attributes: ['id', 'name', 'type']
  }).then(function (backends) {
    res.status(200).send(backends)
  })
})

/*
 * ?id=<BACKEND_ID>
 *
 * @return: Returns the information of a backend.
 */
router.get('/:id', (req, res) => {
  const id = req.params.id
  db.backend.findOne({ where: { id: id } }).then(backend => {
    res.status(200).send({
      id: id,
      name: backend.name,
      type: backend.type,
      credentials: backend.credentials
    })
  })
})

/*
 * ?id=<Backend_ID>
 *
 * @return: Returns a list with all objects of the backend.
 */
router.get('/:id/objects', (req, res) => {
  const id = req.params.id
  db.backend.findOne({ where: { id: id } }).then(backend => {
    if (backend) {
      const ba = new ExternalBackends()
      const instance = ba.getInstance(backend.type)
      instance.getObjects(backend.credentials).then(result => {
        res.status(200).send(result)
      })
    } else res.status(500).send({ status: 'INVALID_BACKEND_ID', error: 'The provided backend id is invalid.' })
  })
})

/*
 * ?id=<Backend_ID>
 * ?oid=<OBJECT_ID>
 *
 * @return: Returns information about a given object and all childs.
 */
router.get('/:id/objects/:oid', (req, res) => {
  const id = req.params.id
  const oid = req.params.oid
  db.backend.findOne({ where: { id: id } }).then(backend => {
    if (backend) {
      const ba = new ExternalBackends()
      const instance = ba.getInstance(backend.type)
      instance.getObject(backend.credentials, oid).then(result => {
        res.status(200).send(result)
      })
    } else res.status(500).send({ status: 'INVALID_BACKEND_ID', error: 'The provided backend id is invalid.' })
  })
})

/*
 * ?id=<Backend_ID>
 *
 * @return: Returns a list of all the object types of the given backend. [{id: <id>, title: <title>}, ...]
 */
router.get('/:id/objecttypes', (req, res) => {
  const id = req.params.id
  db.backend.findOne({ where: { id: id } }).then(backend => {
    const ba = new ExternalBackends()
    const instance = ba.getInstance(backend.type)
    instance.getObjectTypes(backend.credentials).then(result => {
      res.status(200).send(result)
    })
  })
})

/*
 * ?id=<Backend_ID>
 *
 * @return: Returns the sync settings saved in the db.
 */
router.get('/:id/syncsettings', (req, res) => {
  const id = req.params.id
  var types = {}
  db.backend.findOne({ where: { id: id } }).then(backend => {
    types.groups = JSON.parse(backend.groupTypes)
    types.clients = JSON.parse(backend.clientTypes)
    types.sync = backend.sync
    res.status(200).send(types)
  })
})

/*
 * ?id=<Backend_ID>
 *
 * @return: Returns a list of sync types the backend supports.
 */
router.get('/:id/synctypes', (req, res) => {
  const id = req.params.id
  db.backend.findOne({ where: { id: id } }).then(backend => {
    const ba = new ExternalBackends()
    const instance = ba.getInstance(backend.type)
    res.status(200).send(instance.getSyncTypes())
  })
})

// POST requests

/*
 * id: <BACKEND_ID>
 */
router.get('/:id/import', (req, res) => {
  const id = req.params.id

  // Get the backend where the objects are importet from.
  db.backend.findOne({ where: { id: id } }).then(backend => {
    if (backend) {
      var endRequest = []
      const ba = new ExternalBackends()
      const instance = ba.getInstance(backend.type)
      const groups = JSON.parse(backend.groupTypes).map(x => x.id)
      const clients = JSON.parse(backend.clientTypes).map(x => x.id)

      // Get a list with all objects in the backend.
      const objectPromise = new Promise(function (resolve, reject) {
        resolve(instance.getObjects(backend.credentials))
      })

      objectPromise.then(result => {
        // Check for the not implemented exception
        if (result.status) res.status(501).send(result)

        // Filter those objects in groups / clients
        var groupObjects = []
        var clientObjects = []
        result.objects.filter(obj => {
          if (groups.find(x => x === obj.type)) groupObjects.push({ id: obj.id, name: obj.title, type: obj.type, typeName: obj.type_title, sysid: obj.sysid })
          else if (clients.find(y => y === obj.type)) clientObjects.push({ id: obj.id, name: obj.title, type: obj.type, typeName: obj.type_title, sysid: obj.sysid })
        })

        var promises = []
        var promises2 = []

        // Add all groups in the database.
        groupObjects.forEach(group => {
          // Insert the group.
          promises.push(db.group.create({ name: group.name, description: group.typeName }).then(g => {
            // Insert the backend_x_group relation.
            promises2.push(backend.addMappedGroups(g, { through: { externalId: group.id, externalType: group.type } }))
          }))
        })

        // Add all clients in the databse.
        clientObjects.forEach(client => {
          // Insert the client.
          promises.push(db.client.create({ name: client.name, description: client.typeName }).then(c => {
            // Insert the backend_x_client relation.
            promises2.push(backend.addMappedClients(c, { through: { externalId: client.id, externalType: client.type } }))
          }))
        })

        // Wait till all clients / groups are created and all mapping operations are done. Then add childs.
        Promise.all(promises).then(() => {
          Promise.all(promises2).then(() => {
            // Get the backend with all the mapped groups. ! Only groups can have childs !
            db.backend.findOne({ where: { id: backend.id }, include: ['mappedGroups'] }).then(b => {
              var objectData = []
              // Put all groups in the array to make a one session call which returns all needed informations.
              b.mappedGroups.forEach(mGroup => {
                const mG = mGroup.backend_x_group
                const eid = mG.externalId
                const gid = mGroup.id
                objectData.push({ eid: eid, gid: gid })
              })

              // Get all the information needed from the backend instance. (For all object ids in the array)
              var promise = new Promise(function (resolve) {
                resolve(instance.getDataTree(backend.credentials, objectData))
              })

              promise.then(data => {
                // Check for the not implemented exception
                if (data.status) res.status(501).send(data)

                data.forEach(obj => {
                  var groupChildsToAdd = []
                  var clientChildsToAdd = []
                  var prom = []

                  // Put all clientChilds in the clientList and all groupChilds in the groupList.
                  obj.childs.forEach(child => {
                    if (groups.find(x => x === child.type)) {
                      // Get the group id out of the externalId.
                      prom.push(db.backend.findOne({ where: { id: backend.id, '$mappedGroups.backend_x_group.externalId$': child.id }, include: ['mappedGroups'] }).then(ba => {
                        // The externalId should only be once in the db.
                        if (ba.mappedGroups.length === 1) {
                          groupChildsToAdd.push(ba.mappedGroups[0].backend_x_group.groupId)
                        }
                      }))
                    } else if (clients.find(x => x === child.type)) {
                      // Get the client id out of the externalId.
                      prom.push(db.backend.findOne({ where: { id: backend.id, '$mappedClients.backend_x_client.externalId$': child.id }, include: ['mappedClients'] }).then(ba => {
                        // The externalId should only be once in the db.
                        if (ba.mappedClients.length === 1) {
                          clientChildsToAdd.push(ba.mappedClients[0].backend_x_client.clientId)
                        }
                      }))
                    }
                  })

                  // After all the group and client ids are collected. Add them as subgroup / client
                  Promise.all(prom).then(() => {
                    endRequest.push(db.group.findOne({ where: { id: obj.gid } }).then(group => {
                      if (group) {
                        group.addSubgroups(groupChildsToAdd)
                        group.addClients(clientChildsToAdd)
                      }
                    }))
                  })
                })
              })
            })
          })
        })

        // If all requests are fullfilled. End the request.
        Promise.all(endRequest).then(() => {
          res.status(200).send({ status: 'SUCCESS' })
        })
      })
    } else res.status(500).send({ status: 'INVALID_BACKEND_ID', error: 'The provided backend id is invalid.' })
  })
})

// POST requests

/*
 * id: <BACKEND_ID>
 * <OR>
 * name: <BACKEND_NAME>
 * type: <BACKEND_TYPE>
 * credentials: <BACKEND_CREDENTIALS>
 *
 * If the id is set, the backend in the db ist testet.
 * Else the backend is postet in the request.
 */
router.post('/:id/connection', (req, res) => {
  const id = req.params.id

  var getBackend = null
  if (id !== '0') getBackend = db.backend.findOne({ where: { id: id } })
  else getBackend = new Promise(resolve => resolve(req.body))

  getBackend.then(backend => {
    // Creating the backend instance and calling the specific checkConnection.
    const b = new ExternalBackends()
    const instance = b.getInstance(backend.type)
    instance.checkConnection(backend.credentials).then(connection => {
      res.status(200).send({ success: connection.success, error: connection.error })
    })
  })
})

// PUT requests

/*
 * id: <BACKEND_ID>
 * name: <BACKEND_NAME>
 * type: <BACKEND_TYPE>
 * credentials: <BACKEND_CREDENTIALS>
 *
 * Creates or updates the backend.
 */
router.put('/:id', (req, res) => {
  const id = req.params.id
  console.log(id)
  // Save credentials in the db.
  const backend = req.body
  const credentialString = JSON.stringify(backend.credentials)

  if (id === '0') {
    // Insert new backend in the db.
    db.backend.create({ name: backend.name, type: backend.type, credentials: credentialString })
  } else {
    // Update an existing backend in the db.
    db.backend.update({ name: backend.name, type: backend.type, credentials: credentialString }, { where: { id: id } })
  }

  res.status(200).send('success')
})

/*
 * id: <BACKEND_ID>
 * groups: <JSON_OF_ASSIGNED_GROUPS> (list of backend types)
 * clients: <JSON_OF_ASSIGNED_CLIENTS> (list of backend types)
 * sync: <SYNC_OPTION>
 *
 * Saves the group / clients assigned object types in the database and sync type.
 */
router.put('/:id/syncsettings', (req, res) => {
  const id = req.params.id
  const groups = JSON.stringify(req.body.groups)
  const clients = JSON.stringify(req.body.clients)
  const sync = req.body.sync
  db.backend.findOne({ where: { id: id } }).then(backend => {
    db.backend.update({ groupTypes: groups, clientTypes: clients, sync: sync }, { where: { id: id } }).then(() => {
      res.status(200).send()
    })
  })
})

// DELETE requests // TODO:
/*
 * id: <BACKEND_ID>
 *
 * Deletes the backend to the given id.
 */
router.post('/delete', (req, res) => {
  const backendIds = req.body.id

  db.backend.destroy({ where: { id: backendIds } }).then(function () {
    res.status(200).send('success')
  })
})

module.exports.router = router