require('dotenv').config()
const mysql = require('mysql2/promise');
const axios = require('axios')

const startDate = '2018-01'
const endDate = '2018-12'

async function main() {
  const connection = await mysql.createConnection({
    host: process.env.DB_HOST,
    user: process.env.DB_USER,
    password: process.env.DB_PASSWORD,
    port: process.env.DB_PORT,
    database: 'travopti'
  });
  const [result, fields] = await connection.execute(`SELECT * FROM regions WHERE meteostat_id IS NOT NULL`)

  // Promise.all(result.map(res => {
  //   return createClimateObject(res)
  // })).then(results => {
  //   let flat = results.reduce((total, element) => total.concat(element), [])
  //   console.log(flat)
  // })

  let temp = await Promise.all(result.map(x => createClimateObject(x)))
  let finalresults = temp.reduce((total, element) => total.concat(element), [])

  await writeToDatabase(connection, finalresults)
  
  connection.end();
}

async function createClimateObject(src) {
  let response
  try {
    response = await axios.get(`https://api.meteostat.net/v1/climate/normals?station=${src.meteostat_id}&key=${process.env.METEOSTAT_API_KEY}`)
  } catch (error) {
    console.log("skipping: couldn't find results for following region: ")
    console.log(src.region + " with meteostat_id " + src.meteostat_id)
    return []
  }
  if (!response.data.data) {
    console.log("skipping: no data for station meteostat_id " + src.meteostat_id + " (" + src.region + ")")
    return []
  }
  let results = []
  for (let index = 1; index <= 12; index++) {
    let result = {
      region: src.region,
      region_id: src.id,
      month: index,
      temperature: Object.values(response.data.data.temperature)[index - 1] ? Object.values(response.data.data.temperature)[index - 1] : null,
      temperature_min: Object.values(response.data.data.temperature_min)[index - 1] ? Object.values(response.data.data.temperature_min)[index - 1] : null,
      temperature_max: Object.values(response.data.data.temperature_max)[index - 1] ? Object.values(response.data.data.temperature_max)[index - 1] : null,
      precipitation: Object.values(response.data.data.precipitation)[index - 1] ? Object.values(response.data.data.precipitation)[index - 1] : null,
      sunshine: Object.values(response.data.data.sunshine)[index - 1] ? Object.values(response.data.data.sunshine)[index - 1] : null,
    }
    results.push(result)
  }
  return results
}

async function createClimateObjectFromLastYear(src) {
  let response = await axios.get(`https://api.meteostat.net/v1/history/monthly?station=${res.meteostat_id}&start=${startDate}&end=${endDate}&key=${process.env.METEOSTAT_API_KEY}`)


  let result = {
    region_id: src.id,

  }
}

async function writeToDatabase(dbConnection, src) {
  src.forEach(async (element) => {
    //console.log(element)
    await dbConnection.execute(`
      INSERT INTO region_climate (region_id, year, month, temperature_mean, temperature_mean_min, temperature_mean_max, percipitation, sunshine)
      VALUES (${element.region_id}, 0, ${element.month}, ${element.temperature}, ${element.temperature_min}, ${element.temperature_max}, ${element.precipitation}, ${element.sunshine});`)
  });
}

main()