app/models/concerns/account_header.rb


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# frozen_string_literal: true

module AccountHeader
  extend ActiveSupport::Concern

  IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif'].freeze

  class_methods do
    def header_styles(file)
      styles   = {}
      geometry = Paperclip::Geometry.from_file(file)

      styles[:original] = '700x335#' unless geometry.width == 700 && geometry.height == 335
      styles[:static]   = { format: 'png', convert_options: '-coalesce' } if file.content_type == 'image/gif'

      styles
    rescue Paperclip::Errors::NotIdentifiedByImageMagickError
      {}
    end

    private :header_styles
  end

  included do
    # Header upload
    has_attached_file :header, styles: ->(f) { header_styles(f) }, convert_options: { all: '-strip' }
    validates_attachment_content_type :header, content_type: IMAGE_MIME_TYPES
    validates_attachment_size :header, less_than: 2.megabytes
  end

  def header_original_url
    header.url(:original)
  end

  def header_static_url
    header_content_type == 'image/gif' ? header.url(:static) : header_original_url
  end
end