today_ai_weather/app/jobs/generate_weather_art_job.rb

class GenerateWeatherArtJob < ApplicationJob
  queue_as :default

  def perform(city_id)
    @city = City.find(city_id)

    weather_data = fetch_weather_data
    return unless weather_data

    prompt = generate_prompt(weather_data)
    return unless prompt

    image_url = generate_image(prompt)
    return unless image_url

    create_weather_art(weather_data, prompt, image_url)
  rescue StandardError => e
    Rails.logger.error "Error generating weather art for city #{city_id}: #{e.message}"
    Rails.logger.error e.backtrace.join("\n")
  end

  private

  attr_reader :city

  def fetch_weather_data
    WeatherService.new.get_weather(city.latitude, city.longitude)
  end

  def generate_prompt(weather_data)
    AiService.new.generate_prompt(city, weather_data)
  end

  def generate_image(prompt)
    AiService.new.generate_image(prompt)
  end

  def create_weather_art(weather_data, prompt, image_url)
    tempfile = nil

    ActiveRecord::Base.transaction do
      weather_art = city.weather_arts.create!(
        weather_date: Date.today,
        prompt: prompt,
        **weather_data
      )

      tempfile = Down.download(image_url)

      weather_art.image.attach(
        io: File.open(tempfile.path),
        filename: generate_filename,
        content_type: "image/png"
      )

      weather_art
    end
  ensure
    if tempfile
      tempfile.close
      tempfile.unlink
    end
  end

  def generate_filename
    "#{city.country.name}-#{city.name.parameterize}-#{Time.current.strftime('%Y%m%d-%H%M%S')}.png"
  end
end