'use strict'

const mongoose = require('mongoose')
const unique = require('mongoose-unique-validator')
const bcrypt = require('bcrypt')
const crypto = require('crypto')
const debug = require('debug')('tracman-models')

const userSchema = new mongoose.Schema({
  name: {type: String},
  email: {type: String, unique: true},
  newEmail: String,
  emailToken: String,
  slug: {type: String, required: true, unique: true},
  auth: {
    password: String,
    passToken: String,
    passTokenExpires: Date,
    google: String,
    facebook: String,
    twitter: String
  },
  isAdmin: {type: Boolean, required: true, default: false},
  isPro: {type: Boolean, required: true, default: false},
  created: {type: Date, required: true},
  lastLogin: Date,
  settings: {
    units: {type: String, default: 'standard'},
    defaultMap: {type: String, default: 'road'},
    defaultZoom: {type: Number, default: 11},
    showScale: {type: Boolean, default: false},
    showSpeed: {type: Boolean, default: false},
    showTemp: {type: Boolean, default: false},
    showAlt: {type: Boolean, default: false},
    showStreetview: {type: Boolean, default: false},
    marker: {type: String, default: 'red'}
  },
  last: {
    time: Date,
    lat: {type: Number, default: 0},
    lon: {type: Number, default: 0},
    dir: {type: Number, default: 0},
    alt: {type: Number},
    spd: {type: Number, default: 0}
  },
  sk32: {type: String, required: true, unique: true}
}).plugin(unique)

/* User methods */
// TODO: Return promises instead of taking callbacks
// See https://gist.github.com/7h1b0/5154fda207e68ad1cefc#file-random-js
// For an example

// Create email confirmation token
userSchema.methods.createEmailToken = function (next) { // next(err,token)
  debug('user.createEmailToken() called')
  var user = this

  crypto.randomBytes(16, (err, buf) => {
    if (err) return next(err)
    if (buf) {
      debug(`Buffer ${buf.toString('hex')} created`)
      user.emailToken = buf.toString('hex')
      user.save()
      .then(() => {
        return next(null, user.emailToken)
      })
      .catch((err) => {
        return next(err, null)
      })
    }
  })
}

// Create password reset token
userSchema.methods.createPassToken = function (next) { // next(err,token,expires)
  var user = this

  // Reuse old token, resetting clock
  if (user.auth.passTokenExpires >= Date.now()) {
    debug(`Reusing old password token...`)
    user.auth.passTokenExpires = Date.now() + 3600000 // 1 hour
    user.save()
    .then(() => {
      return next(null, user.auth.passToken, user.auth.passTokenExpires)
    })
    .catch((err) => {
      return next(err)
    })

  // Create new token
  } else {
    debug(`Creating new password token...`)
    crypto.randomBytes(16, (err, buf) => {
      if (err) return next(err)
      if (buf) {
        user.auth.passToken = buf.toString('hex')
        user.auth.passTokenExpires = Date.now() + 3600000 // 1 hour
        user.save()
        .then(() => {
          debug('successfully saved user in createPassToken')
          return next(null, user.auth.passToken, user.auth.passTokenExpires)
        })
        .catch((err) => {
          debug('error saving user in createPassToken')
          return next(err)
        })
      }
    })
  }
}

// Generate hash for new password and save it to the database
userSchema.methods.generateHashedPassword = function (password, next) {
  // next(err);

  // Delete token
  this.auth.passToken = undefined
  this.auth.passTokenExpires = undefined

  // Generate hash
  bcrypt.genSalt(8, (err, salt) => {
    if (err) return next(err)
    bcrypt.hash(password, salt, (err, hash) => {
      if (err) return next(err)
      this.auth.password = hash
      this.save()
      next()
    })
  })
}

// Check for valid password
userSchema.methods.validPassword = function (password, next) {
  // next(err,res);
  // res = true/false
  bcrypt.compare(password, this.auth.password, next)
}

module.exports = {
  'user': mongoose.model('User', userSchema)
}