const bodyParser = require("body-parser")
const axios = require("axios")
const outils = require("./backend/controllers/outils")
const mapping = require("./backend/lib/openfisca/mapping")

const openfiscaRoot = "https://openfisca.mes-aides.1jeune1solution.beta.gouv.fr"
const buildOpenFiscaRequest = mapping.buildOpenFiscaRequest
function sendToOpenfisca(situation, callback) {
  let request
  try {
    request = buildOpenFiscaRequest(situation)
  } catch (e) {
    return callback({
      message: e.message,
      name: e.name,
      stack: e.stack,
    })
  }
  axios
    .post(`${openfiscaRoot}/calculate`, request)
    .then((response) => response.data)
    .then((result) => {
      callback(null, result)
    })
    .catch(callback)
}

var ID = function () {
  // Math.random should be unique because of its seeding algorithm.
  // Convert it to base 36 (numbers + letters), and grab the first 9 characters
  // after the decimal.
  return "_" + Math.random().toString(36).substr(2, 9)
}

function mock(app) {
  app.use(bodyParser.json())

  let cache = {}
  app.route("/api/outils/communes/:codePostal").get(outils.communes)
  app.post("/api/situations", function (req, res) {
    const data = Object.assign({ _id: ID() }, req.body)
    cache[data._id] = data
    res.send(data)
  })

  app.get("/api/situations/:id", function (req, res) {
    res.send(cache[req.params.id])
  })

  app.get("/api/situations/:id/openfisca-response", function (req, res, next) {
    sendToOpenfisca(cache[req.params.id], function (err, result) {
      if (err) {
        return next(err)
      }

      res.send(Object.assign({ _id: cache[req.params.id]._id }, result))
    })
  })

  app.get("/api/situations/:id/openfisca-request", function (req, res) {
    res.send(buildOpenFiscaRequest(cache[req.params.id]))
  })

  app.get("/api/openfisca/variables", function (req, res, next) {
    axios
      .get(`${openfiscaRoot}/variables`)
      .then((response) => response.data)
      .then((mapping) => res.send(Object.keys(mapping)))
      .catch((error) => next(error))
  })

  app.get("/api/followups/surveys/:id", function (req, res) {
    res.send({
      benefits: [
        { id: "ppa", amount: 42 },
        { id: "rsa", amount: 145 },
        { id: "aide_logement", amount: 125 },
      ],
    })
  })

  app.post("/api/followups/surveys/:id/answers", function (req, res) {
    res.sendStatus(201)
  })

  app.use(function (err, req, res, next) {
    res
      .status((err.response && err.response.status) || 500)
      .send(
        (err.response && err.response.data) || err.message || err.error || err
      )
    next()
  })
}

module.exports = mock