# frozen_string_literal: true

class APIImageUploadService
  class UploadError < StandardError; end
  attr_reader :params, :image, :upload

  def initialize(params)
    @params = params
  end

  def start!
    file = params.delete(:file)
    APIImage.transaction do
      @image = APIImage.new(**params, creator: CurrentUser.user)
      begin
        @image.file = get_file(@image, file: file)
        process_file(@image, @image.file)
        @image.save
        return @image if @image.invalid?
        store_file(@image, @image.file)
        @image
      rescue UploadError, ActiveRecord::RecordInvalid => e
        @image.exception = e
        @image
      end
    end
  end

  def get_file(image, file: nil)
    return file if file.present?
    raise(UploadError, "No file or source URL provided") if image.original_url.blank?

    download = FileDownload.new(image.original_url)
    download.download!
  end

  def process_file(image, file)
    mime, ext = @image.file_header_info(file.path)
    image.mime_type = mime
    image.file_ext = ext
    image.file_size = file.size
    image.id = Digest::MD5.file(file.path).hexdigest

    width, height = calculate_dimensions(file.path)
    image.width = width
    image.height = height
    image.validate!(:file)
  end

  def store_file(image, file)
    Websites.config.yiffy2_storage.put(image.path, file)
    Websites.config.yiffy2_backup_storage.put(image.path, file)
  end

  def calculate_dimensions(file_path)
    image = Vips::Image.new_from_file(file_path)
    [image.width, image.height]
  end
end