const jwt = require('jsonwebtoken')
const camelcase = require('camelcase')
const CFG = require('../../config')
const TOL = require('../../tools/common')
const ObjectId = require('mongodb').ObjectId

const MSG = {
  USER: {
    NOT_ALLOWED: 'User:NotAllowed'
  }
}

/**
 * For each received request, check the jwt token and user rights
 *
 * @param {HttpRequest}  req Http request from client
 * @param {HttpResponse} res Http context to answer to client
 * @param {Function} next Callback to continue the Express pipe
 */
module.exports = function (pCtx) {
  return (req, res, next) => {
    if (req.method === 'OPTIONS') return next()
    // Find token in the request. Can be set in:
    // - header
    //    - token field : {token}
    //    - Authorization field : "Bearer {token}"
    // - query
    //    - token field
    let lToken
    if (req.headers.token) {
      lToken = req.headers.token
    } else if (req.query.token) {
      lToken = req.query.token
    } else if (req.headers.authorization) {
      let match = req.headers.authorization.match(/Bearer ?(.*)/)
      if (match) {
        lToken = match[1]
      }
    } else {
      // To be removed when client is ready to use full auth API
      if (!CFG.jwt.enable) {
        return pCtx.db.collection('users')
          .find({username: 'admin'})
          .limit(1)
          .next(function (pErr, pUser) {
            // console.log(pUser)
            req.user = pUser
            next()
          })
      } else {
        return res.done(401, 'jwtAccess:Missing')
      }
    }

    // Decrypt received token
    jwt.verify(lToken, CFG.jwt.jwtAccess.secret, function (pErr, pToken) {
      if (pErr) {
        return res.done(401, new Error(`jwtAccess:${camelcase(pErr.message, {pascalCase: true})}`))
      }

      res.token = pToken

      let payloadState = TOL.jwt.checkPayload(req, res.token.data)
      if (payloadState) {
        return res.done(401, 'jwtAccess:CorruptedPayload:' + payloadState)
      }

      req.user = res.token.data.user
      try { req.user._id = ObjectId(req.user.id) } catch (e) {}
      delete req.user.pass

      next()
    })
  }
}

/**
 * Projects user fields to be public compliant
 * @param {Object} pUser Public-ified user
 */
function JOB_getPublicUser (pUser) {
  return {
    id: pUser.id,
    user: pUser.user,
    role: pUser.role,
    name: pUser.name
  }
}