module AemetOpendata

# File lib/aemet_opendata.rb, line 16
def fetch_city(city_name)
  if !AemetOpendata.api_key.nil?
    conn = Faraday.new "#{AemetOpendata.api_endpoint}", ssl: { verify: false }
    @data = conn.get "opendata/api/observacion/convencional/todas?api_key=#{AemetOpendata.api_key}"
  else
    puts 'You must first specify an API key'
    return
  end

  if city_name.nil? || city_name.empty?
    puts 'Invalid city name'
    return
  end

  response = JSON.parse(@data.body)
  parse_response(response, city_name)
end

# File lib/aemet_opendata.rb, line 72
def get_city_weather_from_idema(data_url)
  city_connection = Faraday.new(data_url, ssl: { verify: false }) do |connection|
    connection.response :encoding # use Faraday::Encoding middleware
    connection.adapter Faraday.default_adapter # net/http
  end

  conn_hash = JSON.parse(city_connection.get.body)
  datos_url = conn_hash['datos']
  datos_connection = Faraday.new(datos_url, ssl: { verify: false }) do |connection|
    connection.response :encoding # use Faraday::Encoding middleware
    connection.adapter Faraday.default_adapter # net/http
  end
  JSON.parse(datos_connection.get.body)
end

# File lib/aemet_opendata.rb, line 59
def parse_and_fetch_city_idema(city_name, json_array)
  res = nil
  json_array.each do |key|
    city = key.to_h
    if city['ubi'].force_encoding('UTF-8').include?(city_name.upcase)
      res = city['idema'].encode('UTF-8')
    end
  end
  res
end

# File lib/aemet_opendata.rb, line 38
def parse_response(response, city_name)
  data_connection = Faraday.new(response['datos'].to_s, ssl: { verify: false }) do |connection|
    connection.response :encoding  # use Faraday::Encoding middleware
    connection.adapter Faraday.default_adapter # net/http
  end

  json_array = JSON.parse(data_connection.get.body)
  city_idema = parse_and_fetch_city_idema(city_name, json_array)
  unless city_idema.nil?
    ##
    # Now we have to fetch the conventional observation weather from the idema.
    # It should return a hash containing JSON objects of the weather in
    # the place defined by the idema in the following 24 hours.
    city_weather_url = "#{AemetOpendata.api_endpoint}/opendata/api/observacion/convencional/datos/estacion/#{city_idema}?api_key=#{AemetOpendata.api_key}"
    city_weather_hash =
      get_city_weather_from_idema(city_weather_url)
  end
end