const router = require("express").Router();

// Models
const getRegions = require('../models/getRegions.js');
const getSearchPresets = require("../models/getSearchPresets.js");

// Utils
const _ = require('lodash')
const base64 = require("../util/base64.js")
const scoreAndSearch = require("../util/scoreAndSearch.js");
const oldToNewQuerySyntax = require("../util/oldToNewQuerySyntax.js")
const { getUniqueTags } = require("../models/getTags.js");

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

  return router;
};

function tagsHandler(dbConn) {
  return function (req, res) {
    getUniqueTags(dbConn).then(tags => {
      res.json(tags.map(tag => tag.name))
    }).catch(error => {
      // TODO error handling
    })
  }
}

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

function searchHandler(dbConn) {
  return async 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)

    let [regions] = await Promise.all([getRegions(dbConn)])
    let data = {
      regions: regions,
    }

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

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

      // only dev:
      if (process.env.SHOW_MATCH_VALUE === '1') searchResults.forEach(reg => reg.name = `${reg.name} (${_.round(reg.score * 10, 1)}% match)`)

      // FILTER NULLSCORES
      if (!_.get(q, 'showRegionsWithNullScore', false)) {
        console.log('without null scores');
        searchResults.forEach(el => console.log('region:', el.name, 'score:', el.score))
        searchResults = searchResults.filter(el => !_.some(el.scores, score => _.isNaN(score.score) || _.isNil(score.score) || score.score <= 0))
      }
      // SEND RESPONSE
      res.json(searchResults)

    }).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: {},
    others: {}
  }
  // 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

  // others
  if (queries.avg_price_relative) q.others.avg_price_relative = queries.avg_price_relative
  if (queries.tags) q.others.tags = queries.tags

  return q
}