require 'telegram/bot'
require 'accuweather'
require 'yandex-translator'
token = '***'

class Float
    def to_cel
        (self-32)*5/9
    end
end

module Answer
    TRANSLATOR = Yandex::Translator.new('***')
    RE = /(\/\w*)(\s)/

    def self.command_extraction message
        match1 = message.text.match RE
        begin
            match1[1]
        rescue
            nil
        end
    end

    def self.content_extraction message
        message.text.sub RE, ""
    end

    @translation_of = lambda do |word|
        ans = TRANSLATOR.translate word, to: 'ru'
    end

    @weather_of = lambda do |word|
        city = Accuweather.city_search(name: word).first
        if city
            current_weather = Accuweather.get_conditions(location_id: city.id).current
            temp = current_weather.temperature.to_f.to_cel.round
            sky = current_weather.weather_text
            real_feel = current_weather.real_feel.to_f.to_cel.round
            ans = "#{temp} C, #{sky}, real_feel: #{real_feel}"
        end
    end

    ACTION = {'/trans' => @translation_of, '/weather' => @weather_of}

    def answer message
        command = command_extraction message
        action = ACTION.fetch(command, nil)
        if action
            action.call content_extraction message
        else
            nil
        end
    end

    module_function :answer
    class << self
        private :command_extraction, :content_extraction
    end
end


Telegram::Bot::Client.run(token) do |bot|
    bot.listen do |message|
        answer = Answer.answer message
        begin
            bot.api.sendMessage(chat_id: message.chat.id, text: answer)
        rescue
            nil
        end
    end
end