const router = require("express").Router();
const _ = require('lodash')
const getSearchPresets = require("../models/getSearchPresets.js");
const base64 = require("../util/base64.js")
const sas = require("../util/scoreAndSearch.js");
const oldToNewQuerySyntax = require("../util/oldToNewQuerySyntax.js")

module.exports = dbConn => {
  router.get("/api/v1/search", searchHandler(dbConn));
  router.get("/api/v1/search/presets", presetHandler(dbConn));

  return router;
};

function presetHandler(dbConn) {
  return function (req, res) {
    getSearchPresets(dbConn).then(presets => {
      res.json(presets)
    }).catch(error => {
      // TODO error handling
    })
  }
}

function searchHandler(dbConn) {
  const scoreAndSearch = sas(dbConn)
  return function (req, res) {
    let response = {}

    response.meta = {
      params: req.params,
      query: req.query,
      headers: req.headers
    }

    // SWITCH TO SUPPORT OLD AND NEW BASE64 BASED QUERY SYNTAX
    let q = req.query.q ? base64.base64ToObj(req.query.q) : req.query
    console.log('Q:', q)

    // transform syntax and seperate climate queries from price queries
    if (!req.query.q) {
      q = oldToNewQuerySyntax(q)
    }
    // CHOOSE PARAMS WHICH SHALL BE PASSED TO SCORE AND SEARCH
    let scoreQueryObj = prepareQueries(q)


    scoreAndSearch(q.from, q.to, scoreQueryObj).then(searchResults => {

      //response.data = searchResults
      // FILTER if query contains filterString
      if (q.textfilter) {
        response = filterByString(searchResults, q.textfilter, q.fulltext)
      } else {
        response = searchResults
      }

      // FILTER NULLSCORES
      if (!_.get(q, 'showRegionsWithNullScore', false)) {
        console.log('without null scores');
        response = response.filter(el => !_.some(el.scores, score => _.isNaN(score.score) || _.isNull(score.score) || _.isUndefined(score.score)))//.filter(el => !_.isNaN(el.score))
      }
      // SEND RESPONSE
      res.json(response)

    }).catch(e => {
      // TODO error handling
      console.log(e)
      res.status(400).send(e.message)
    })
  }
}

function filterByString(searchResults, filterString, boolFulltext) {
  return _.filter(searchResults, region => {
    // console.log("filtering: filterString, boolFulltext");
    // console.log(filterString, boolFulltext);
    filterString = filterString.toLowerCase()
    let name = region.name.toLowerCase()
    let country = region.country.toLowerCase()
    if (boolFulltext) {
      let desc = region.description.toLowerCase()
      return name.includes(filterString) || country.includes(filterString) || desc.includes(filterString)
    }
    return name.includes(filterString) || country.includes(filterString)
  })
}

function prepareQueries(queries) {
  let q = {
    climate: {},
    costs: {}
  }
  // climate
  if (queries.temperature_mean_max) q.climate.temperature_mean_max = queries.temperature_mean_max
  if (queries.precipitation) q.climate.precipitation = queries.precipitation
  if (queries.rain_days) q.climate.rain_days = queries.rain_days
  if (queries.sun_hours) q.climate.sun_hours = queries.sun_hours

  // costs
  if (queries.accommodation_costs) q.costs.accommodation_costs = queries.accommodation_costs
  if (queries.food_costs) q.costs.food_costs = queries.food_costs
  if (queries.alcohol_costs) q.costs.alcohol_costs = queries.alcohol_costs
  if (queries.water_costs) q.costs.water_costs = queries.water_costs
  if (queries.local_transportation_costs) q.costs.local_transportation_costs = queries.local_transportation_costs
  if (queries.entertainment_costs) q.costs.entertainment_costs = queries.entertainment_costs
  if (queries.average_per_day_costs) q.costs.average_per_day_costs = queries.average_per_day_costs

  return q
}