import fs from 'fs'
import async from 'async'
import bcrypt from 'bcryptjs'
import * as passportSaml from 'passport-saml'
import { dbConnection } from '../config/dbconn'
import { dbController } from '../controller/dbController'
import { gitlabController } from '../controller/gitlabController'
import { miscConst } from '../config/const'
import { mailer } from '../config/mailer'
import { User } from '../classes/user'
import { Website } from '../classes/website'
import { Repo } from '../classes/repo'

const SamlStrategy = passportSaml.Strategy
const saltRounds = 10
const salt = 64 // salt length
const logoDir = 'built/public/upload/'
const defaultLogo: any = 'built/public/default/logo.png'

module.exports = function (app: any, config: any, passport: any, lang: string) {
  // =========== PASSPORT =======
  passport.serializeUser(function (user: any, done: any) {
    done(null, user)
  })

  passport.deserializeUser(function (user: any, done: any) {
    done(null, user)
  })

  const samlStrategy = new SamlStrategy({
    // URL that goes from the Identity Provider -> Service Provider
    callbackUrl: config.passport.saml.path,
    // Base address to call logout requests
    logoutUrl: config.passport.saml.logoutUrl,

    entryPoint: config.passport.saml.entryPoint,
    issuer: config.passport.saml.issuer,
    identifierFormat: undefined,

    // Service Provider private key
    decryptionPvk: fs.readFileSync(__dirname + '/cert/key.pem', 'utf8'),
    // Service Provider Certificate
    privateKey: fs.readFileSync(__dirname + '/cert/key.pem', 'utf8'),
    // Identity Provider's public key
    cert: fs.readFileSync(__dirname + '/cert/cert_idp.pem', 'utf8'),

    validateInResponseTo: false,
    disableRequestedAuthnContext: true
  },
  function (profile: any, done: any) {
    return done(null, {
      id: profile.nameID,
      idFormat: profile.nameIDFormat,
      email: profile.email,
      firstName: profile.givenName,
      lastName: profile.sn
    })
  })

  passport.use(samlStrategy)

  // ============= SAML ==============
  app.post(config.passport.saml.path,
    passport.authenticate(config.passport.strategy,
      {
        failureRedirect: '/account/',
        failureFlash: true
      }),
    function (req: any, res: any) {
      res.redirect('/account/')
    }
  )

  // to generate Service Provider's XML metadata
  app.get('/saml/metadata',
    function (req: any, res: any) {
      res.type('application/xml')
      const spMetadata = samlStrategy.generateServiceProviderMetadata(fs.readFileSync(__dirname + '/cert/cert.pem', 'utf8'))
      res.status(200).send(spMetadata)
    }
  )

  // ======== APP ROUTES - ACCOUNT ====================

  async function getLoggedInUserData (email: string) {
    const user = await dbController.getUserByEmail(email)
    if (!user) {
      console.log('no user found')
      return null
    } else {
      const loggedInUser = new User(
        user.id, email, user.salutation, user.title, user.firstname, user.lastname, user.industry, user.organisation, user.speciality, user.m4lab_idp, user.verificationStatus
      )

      const userGitlabId = await dbController.getGitlabId(loggedInUser.id)
      if (userGitlabId) {
        loggedInUser.setGitlabUserId(userGitlabId)
      }
      return loggedInUser
    }
  }

  app.get('/', async function (req: any, res: any) {
    if (!req.isAuthenticated()) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)
      if (loggedInUser == null) {
        console.error('user data is not found')
        res.status(500).render(lang + '/500', { error: 'Your data is not found. Please try again.' })
      } else {
        res.render(lang + '/account/home', {
          user: loggedInUser
        })
      }
    }
  })

  app.get('/login',
    passport.authenticate(config.passport.strategy, {
      successRedirect: '/',
      failureRedirect: '/login'
    })
  )

  app.get('/logout', function (req: any, res: any) {
    if (req.user == null) {
      return res.redirect('/')
    }

    req.user.nameID = req.user.id
    req.user.nameIDFormat = req.user.idFormat
    return samlStrategy.logout(req, function (err: any, uri: any) {
      req.logout()

      if (req.session) {
        req.session.destroy((err: any) => {
          if (err) {
            return console.log(err)
          }
        })
      }

      return res.redirect(uri)
    })
  })

  app.get('/profile', async function (req: any, res: any) {
    if (!req.isAuthenticated()) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)
      if (loggedInUser == null) { // null user
        res.redirect('/account/')
      } else {
        if (loggedInUser.getVerificationStatus() !== 1) {
          res.redirect('/account/')
        } else {
          res.render(lang + '/account/profile', {
            user: loggedInUser
          })
        }
      }
    }
  })

  app.get('/services', async function (req: any, res: any) {
    if (!req.isAuthenticated()) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)
      if (loggedInUser == null) { // null user
        res.redirect('/account/')
      } else {
        if (loggedInUser.getVerificationStatus() !== 1) { // unverified users
          res.redirect('/account/')
        } else {
          const gitlabReposArr = []
          const gitlabPagesArr = []

          if (loggedInUser.getGitlabUserId()) { // for users who have activated their gitlab account
            const userProjects = await gitlabController.getUserProjects(loggedInUser.getGitlabUserId()!)
            if (userProjects) {
              let project: any
              for (project in userProjects) {
                if (userProjects[project].tag_list.includes('website')) {
                  const page = {
                    projectInformation: new Website(loggedInUser.getGitlabUserId()!, userProjects[project].name, userProjects[project].description,
                      userProjects[project].id, userProjects[project].avatar_url, userProjects[project].path_with_namespace),
                    pipelineStatus: await gitlabController.getProjectPipelineLatestStatus(userProjects[project].id)
                  }
                  gitlabPagesArr.push(page)
                } else {
                  const repo = new Repo(loggedInUser.getGitlabUserId()!, userProjects[project].name, userProjects[project].description,
                    userProjects[project].id, userProjects[project].avatar_url, userProjects[project].path_with_namespace)
                  gitlabReposArr.push(repo)
                }
              }
            }
            res.render(lang + '/account/services', {
              user: loggedInUser,
              gitlabRepos: gitlabReposArr,
              gitlabPages: gitlabPagesArr
            })
          } else { // for users who have not activated their gitlab account yet
            const gitlabUser = await gitlabController.getUserByEmail(loggedInUser.getEmail())
            if (!gitlabUser) {
              res.render(lang + '/account/services', {
                user: loggedInUser,
                gitlabRepos: null,
                gitlabPages: null
              })
            } else {
              const gitlabActivationData = {
                user_id: loggedInUser.getId(),
                gitlab_userId: gitlabUser.id
              }

              dbController.addGitlabUser(gitlabActivationData, function (err: any) {
                if (err) {
                  res.status(500).render(lang + '/500', { error: err })
                } else {
                  res.redirect('/account/services')
                }
              })
            }
          }
        }
      }
    }
  })

  app.get('/security', async function (req: any, res: any) {
    if (!req.isAuthenticated()) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)
      if (loggedInUser == null) { // null user
        res.redirect('/account/')
      } else {
        if (loggedInUser.getVerificationStatus() === 1 && loggedInUser.getIdpStatus() === 1) {
          res.render(lang + '/account/security', {
            user: loggedInUser
          })
        } else {
          res.redirect('/account/')
        }
      }
    }
  })

  app.post('/updateProfile', async function (req: any, res: any) {
    if (!req.isAuthenticated()) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)
      if (loggedInUser == null) { // null user
        res.redirect('/account/')
      } else {
        const userData = {
          salutation: req.body.inputSalutation,
          title: req.body.inputTitle,
          firstname: req.body.inputFirstname,
          lastname: req.body.inputLastname,
          email: req.body.inputEmail,
          organisation: req.body.inputOrganisation,
          industry: req.body.inputIndustry,
          speciality: req.body.inputSpeciality
        }
        const result = await dbController.updateUserById(loggedInUser.getId(), userData)
        if (!result) {
          res.flash('error', 'Failed')
        } else {
          loggedInUser.updateProfile(userData.salutation, userData.title, userData.firstname, userData.lastname, userData.email,
            userData.organisation, userData.industry, userData.speciality)
          res.flash('success', 'Ihr Benutzerprofil wurde aktualisiert!')
        }
        res.redirect('/account/profile')
      }
    }
  })

  app.post('/changePwd', async function (req: any, res: any) {
    if (!req.isAuthenticated()) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)

      if (loggedInUser == null) { // null user
        res.redirect('/account/')
      } else {
        const currPwd = req.body.inputCurrPwd
        const newPwd = req.body.inputNewPwd
        const retypePwd = req.body.inputConfirm

        dbConnection.user.query('SELECT password FROM credential WHERE user_id=' + loggedInUser.getId(), function (err: any, rows: any) {
          if (err) {
            console.error(err)
            res.status(500).render(lang + '/500', { error: err })
          }
          const userPwd = rows[0].password

          // check if the password is correct
          bcrypt.compare(currPwd, userPwd, function (err, isMatch) {
            if (err) {
              console.error(err)
              res.status(500).render(lang + '/500', { error: err })
            } else if (!isMatch) {
              res.flash('error', 'Das Passwort ist leider falsch. Bitte überprüfen Sie Ihre Eingabe.')
              res.redirect('/account/security')
            } else {
              if (newPwd !== retypePwd) {
                res.flash('error', 'Passwörter stimmen nicht überein. Bitte stellen Sie sicher, dass Sie das Passwort beide Male genau gleich eingeben.')
                res.redirect('/account/security')
              } else {
                // update password
                bcrypt.genSalt(saltRounds, function (err, salt) {
                  bcrypt.hash(newPwd, salt, async function (err, hash) {
                    const credentialData = {
                      password: hash,
                      user_id: loggedInUser.getId()
                    }

                    const result = await dbController.updateCredential(credentialData)
                    if (!result) {
                      console.log('Failed to reset password')
                      res.flash('error', 'Datenbankfehler: Passwort kann nicht geändert werden.')
                    } else {
                      res.flash('success', 'Passwort aktualisiert!')
                      // send notifiaction email
                      mailer.options.to = loggedInUser.getEmail()
                      mailer.options.subject = miscConst.updatePasswordMailSubject
                      mailer.options.html = miscConst.updatePasswordMailContent + '<div>' + miscConst.mailSignature + '</div>'
                      mailer.transporter.sendMail(mailer.options, function (err: any) {
                        if (err) { console.log(err) }
                      })
                    }
                    res.redirect('/account/security')
                  })
                })
              }
            }
          })
        })
      }
    }
  })

  app.get('/resendVerificationEmail', async function (req: any, res: any) {
    if (!req.isAuthenticated) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)
      if (loggedInUser == null) {
        res.redirect('/login')
      } else {
        const token = await dbController.getVerificationTokenByUserId(loggedInUser.id)
        if (!token) {
          res.send(false)
        } else {
          // send email
          const emailSubject = 'Bitte bestätigen Sie Ihr M4_LAB Benutzerkonto'
          const emailContent = '<div>Lieber Nutzer,<br/><br/>' +
            '<p>vielen Dank für Ihre Anmeldung am Transferportal der HFT Stuttgart. <br/>' +
            'Um Ihre Anmeldung zu bestätigen, klicken Sie bitte diesen Link: ' + config.app.host + '/verifyAccount?token=' + token +
            '<br/><br/>' +
            'Ohne Bestätigung Ihres Kontos müssen wir Ihr Konto leider nach 7 Tagen löschen.</p><br/>' + miscConst.mailSignature +
            '</div>'
          mailer.options.to = loggedInUser.email
          mailer.options.subject = emailSubject
          mailer.options.html = emailContent
          mailer.transporter.sendMail(mailer.options, function (err: any) {
            if (err) {
              console.log('cannot send email')
              throw err
            }
          })
          res.send(true)
        }
      }
    }
  })

  // ============= NEW GITLAB PAGES ===========================

  app.get('/newInformation', async function (req: any, res: any) {
    if (!req.isAuthenticated()) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)
      if (loggedInUser == null) {
        res.redirect('/login')
      } else {
        const gitlabUser = await gitlabController.getUserByEmail(loggedInUser.getEmail())
        if (!gitlabUser) { // no user found
          res.redirect('/account/services')
        } else {
          res.render(lang + '/account/newInformation', {
            user: loggedInUser,
            gitlabUsername: gitlabUser.username
          })
        }
      }
    }
  })
  app.post('/newInformation', async function (req: any, res: any) {
    if (!req.isAuthenticated()) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)
      if (loggedInUser == null) {
        res.redirect('/login')
      } else {
        if (!req.body.name && !req.body.description) {
          res.flash('error', 'Bitte geben Sie die benötigten Daten ein')
          res.redirect('/account/newInformation')
        } else {
          const projectName = req.body.name.toLowerCase().replace(/\s/g, '-')
          const projectDesc = req.body.description
          const projectTemplate = req.body.template
          const newInformation = new Website(loggedInUser.getGitlabUserId()!, projectName, projectDesc)
          let newLogoFile = defaultLogo

          if (req.files) { newLogoFile = req.files.logo }

          async.waterfall([
            function (callback: any) { // upload logo
              if (!req.files) {
                callback(null, newLogoFile)
              } else {
                newLogoFile.mv(logoDir + newLogoFile.name, function (err: any) {
                  newLogoFile = logoDir + newLogoFile.name
                  callback(err, newLogoFile)
                })
              }
            },
            async function (newLogoFile: any) { // create a new GitLab Page
              const newPages = await gitlabController.createNewPages(newInformation, newLogoFile, projectTemplate)
              if (newPages.status) {
                if (newPages.data.message.name === 'has already been taken') {
                  res.flash('error', "Der Projektname '" + newInformation.getName() + "' ist bereits vergeben, bitte wählen Sie einen anderen Namen.")
                } else {
                  res.flash('error', 'Ein Fehler ist aufgetreten. Bitte versuchen Sie es erneut. ')
                }
                res.redirect('/account/newInformation')
              } else {
                res.flash('success', 'Ihre Webseite wurde erstellt, aber noch nicht veröffentlicht. Um Ihre Webseite endgültig zu veröffentlichen, ' +
                  'schließen Sie die Einrichtung gemäß unten stehender Anleitung ab.')
                res.redirect('/account/updateInformation?id=' + String(newPages.id))
              }
            }
          ], function (err) {
            if (err != null) console.log(err)
            // remove logo
            if (req.files) {
              fs.unlink(newLogoFile, (err) => {
                if (err != null) console.log(err)
              })
            }
          })
        }
      }
    }
  })

  app.get('/updateInformation', async function (req: any, res: any) {
    if (!req.isAuthenticated()) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)

      if (loggedInUser == null) {
        res.redirect('/login')
      } else {
        if (!req.query.id) {
          res.redirect('/account/services')
        } else {
          const project = await gitlabController.getProjectById(req.query.id)
          if (!project) {
            console.log(' ========= Error or no project found')
            res.redirect('/account/services')
          } else if (!project.owner) {
            console.log(' ========= Project cannot be accessed, since it does not have an owner')
            res.redirect('/account/services')
          } else if (project.owner.id !== loggedInUser.getGitlabUserId()) {
            console.log(' ========= Access denied: Not your project')
            res.redirect('/account/services')
          } else {
            const curInformation = new Website(loggedInUser.getGitlabUserId()!, project.name, project.description,
              req.query.id, project.avatar_url, project.path_with_namespace)

            res.render(lang + '/account/updateInformation', {
              user: loggedInUser,
              information: curInformation
            })
          }
        }
      }
    }
  })
  // update a website
  app.post('/updateInformation', async function (req: any, res: any) {
    if (!req.isAuthenticated()) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)

      if (loggedInUser == null) {
        res.redirect('/login')
      } else {
        if (!req.body.name && !req.body.description) {
          res.flash('error', 'Bitte geben Sie die benötigten Daten ein')
          res.redirect('/account/updateInformation')
        } else {
          const projectName = req.body.name.toLowerCase().replace(/\s/g, '-')
          const projectDesc = req.body.description
          const updatedInformation = new Website(loggedInUser.getGitlabUserId()!, projectName, projectDesc, req.query.id)
          let newLogoFile: any

          async.waterfall([
            function (callback: any) { // upload logo
              if (!req.files) {
                callback(null, newLogoFile)
              } else {
                newLogoFile = req.files.logo
                newLogoFile.mv(logoDir + String(newLogoFile.name), function (err: any) {
                  newLogoFile = logoDir + String(newLogoFile.name)
                  callback(err, newLogoFile)
                })
              }
            },
            async function (newLogoFile: any) { // update gitlab page
              const updatedPages = await gitlabController.updateProject(updatedInformation, newLogoFile)

              if (updatedPages.status) {
                if (updatedPages.data.message.name === 'has already been taken') {
                  res.flash('error', "Der Projektname '" + String(projectName) + "' ist bereits vergeben, bitte wählen Sie einen anderen Namen.")
                } else {
                  res.flash('error', 'Ein Fehler ist aufgetreten. Bitte versuchen Sie es erneut. ')
                }
              } else {
                updatedInformation.setLogo(updatedPages.avatar_url)
                updatedInformation.setPath(updatedPages.path)
                res.flash('success', 'Ihre Website wurde aktualisiert')
              }

              res.redirect('/account/updateInformation?id=' + String(updatedInformation.getId()))
            }
          ], function (err) {
            if (err != null) console.log(err)
            if (newLogoFile) { // remove logo
              fs.unlink(newLogoFile, (err) => {
                if (err != null) console.log(err)
              })
            }
          })
        }
      }
    }
  })

  app.delete('/deleteProject', async function (req: any, res: any) {
    if (!req.isAuthenticated()) {
      res.redirect('/login')
    } else {
      const loggedInUser = await getLoggedInUserData(req.user.email)
      if (loggedInUser == null) {
        res.redirect('/login')
      } else {
        const projectId = req.body.id

        if (projectId) {
          // check if the owner is valid
          const project = await gitlabController.getProjectById(projectId)
          if (!project) {
            console.log(' ========= Error or no project found')
          } else if (!project.owner) {
            console.log(' ========= Project cannot be accessed, since it does not have an owner')
          } else if (project.owner.id !== loggedInUser.getGitlabUserId()) {
            console.log(' ========= Access denied: Not your project')
          } else {
            const isDeleted = await gitlabController.deleteProjectById(projectId)
            if (!isDeleted) {
              res.flash('error', 'Project cannot be deleted. Please try again.')
            }
          }
        }
        res.redirect('/account/services')
      }
    }
  })
}