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"use strict";
const LATITUDE  = 43.26271;
const LONGITUDE = -2.92528;
const TIMEZONE  = "Europe/Madrid";
const WEATHERS  = [
   "CLEAR_SKY",
   "MAINLY_CLEAR",
   "FOG",
   "DRIZZLE",
   "FREEZING_DRIZZLE",
   "RAIN",
   "FREEZING_RAIN",
   "SNOW_FALL",
   "SNOW_GRAINS",
   "RAIN_SHOWERS",
   "SNOW_SHOWERS",
   "THUNDERSTORM",
   "THUNDERSTORM_HAIL"
];
// We can use some symbols from here:
// https://www.alt-codes.net/weather-symbols.php
const WEATHER2ICON  = {
  CLEAR_SKY: "$#x2600;",
  MAINLY_CLEAR: "🌤",
  FOG: "🌫",
  DRIZZLE: "🌦",
  FREEZING_DRIZZLE: "🌦",
  RAIN: "🌧",
  FREEZING_RAIN: "🌧",
  SNOW_FALL: "🌨",
  SNOW_GRAINS: "🌨",
  RAIN_SHOWERS: "🌧",
  SNOW_SHOWERS: "⛇",
  THUNDERSTORM: "⛈",
  THUNDERSTORM_HAIL: "⛈",
};
const WMO_CONVERTER = {
  0:  "CLEAR_SKY",
  1:  "MAINLY_CLEAR",
  2:  "MAINLY_CLEAR",
  3:  "MAINLY_CLEAR",
  45: "FOG",
  48: "FOG",
  51: "DRIZZLE",
  53: "DRIZZLE",
  55: "DRIZZLE",
  56: "FREEZING_DRIZZLE",
  57: "FREEZING_DRIZZLE",
  61: "RAIN",
  63: "RAIN",
  65: "RAIN",
  66: "FREEZING_RAIN",
  67: "FREEZING_RAIN",
  71: "SNOW_FALL",
  73: "SNOW_FALL",
  75: "SNOW_FALL",
  77: "SNOW_GRAINS",
  80: "RAIN_SHOWERS",
  81: "RAIN_SHOWERS",
  82: "RAIN_SHOWERS",
  85: "SNOW_SHOWERS",
  86: "SNOW_SHOWERS",
  95: "THUNDERSTORM",
  96: "THUNDERSTORM_HAIL",
  99: "THUNDERSTORM_HAIL"
};

function makeDay(date, t_max, t_min, weather){
  console.log(Array.from(arguments));

  let weather_desc = weather2description(weather);

  let week_container = document.querySelector(".forecast");

  let day_element = document.createElement("article");
  day_element.setAttribute("class", "day-forecast");
  day_element.innerHTML = `
  <div class="day-forecast-text">
    <h2><time datetime="${date}">${(new Date(date)).toLocaleString()}</h2>
    <p>${weather_desc}</p>
    <ul>
        <li>Max: ${t_max}C</li>
        <li>Min: ${t_min}C</li>
    </ul>
  </div>
  <span class="day-forecast-image" title="${weather_desc}">${WEATHER2ICON[weather]}</span>`

  week_container.appendChild(day_element);

}

function weather2description(weather){
  let str = weather.replaceAll("_"," ").toLowerCase();
  return str.charAt(0).toUpperCase() + str.slice(1);
}

function processResponse( response_obj ) {
  console.log(response_obj);
  let data = response_obj.daily;

  // Our variables are here:
  let time     = data.time;
  let temp_max = data.temperature_2m_max;
  let temp_min = data.temperature_2m_min;
  let code     = data.weathercode;

  for(let i = 0; i < time.length; i++){
    makeDay(time[i], temp_max[i], temp_min[i], WMO_CONVERTER[code[i]]);
  }
}

function dailyURL(){
  return `https://api.open-meteo.com/v1/forecast`+
    `?latitude=${LATITUDE}` +
    `&longitude=${LONGITUDE}` +
    `&timezone=${TIMEZONE}` +
    `&daily=temperature_2m_max,temperature_2m_min,weathercode`
}

fetch( dailyURL() )
  .then((r)=>r.json())
  .then(processResponse)
  .catch((err)=>console.error(err));