class Attachment < ActiveRecord::Base
  include Tire::Model::Search
  include Tire::Model::Callbacks

  # after_save :save_to_git
  belongs_to :attachable, :polymorphic => true
  validates_presence_of :attachable

  def self.create_from_uploaded_file(file, user, options = {})
    filename = file.original_filename
    attachment = Attachment.create( options.merge(
      filename: filename,
      content_type: file.content_type,
      size: file.size,
    ))

    if attachment.errors.none?
      attachment.save_to_gollum(
        file, user, 
        "uploading file: #{filename}"
      )
    end

    attachment
  end

  def file_data
    format = File.extname(filename).gsub(".", "")
    $wiki.file(wiki_dir + "/" + wiki_attachment_data + "." + format).raw_data
  end

  def save_to_gollum(file, user, message)
    commit = { 
      message:  message,
      name:     user.name,
      email:    user.email
    }

    file_name = file.try(:original_filename) || File.basename(file.path)
    extension = File.extname(file_name).gsub(".", "")
    data_file = file.try(:tempfile) || file
    $wiki.write_page(wiki_attachment_data, extension, data_file, commit, wiki_dir)
  end

  protected

  def wiki_attachment_data
    "#{id}-data"
  end

  def wiki_dir
    "attachments/#{id}"
  end
end