module Alchemy
  class Attachment < ActiveRecord::Base
    include Filetypes
    include NameConversions

    acts_as_taggable
    file_accessor :file
    stampable :stamper_class_name => 'Alchemy::User'

    attr_accessible :file, :name, :file_name, :tag_list

    has_many :essence_files, :class_name => 'Alchemy::EssenceFile', :foreign_key => 'attachment_id'
    has_many :contents, :through => :essence_files
    has_many :elements, :through => :contents
    has_many :pages, :through => :elements

    validates_presence_of :file
    validates_format_of :file_name, :with => /^[A-Za-z0-9\.\-_]+$/, :on => :update
    validates_size_of :file, :maximum => Config.get(:uploader)['file_size_limit'].megabytes
    validates_property(
      :format,
      :of => :file,
      :in => Config.get(:uploader)['allowed_filetypes']['attachments'],
      :case_sensitive => false,
      :message => I18n.t("not a valid file"),
      :unless => proc { Config.get(:uploader)['allowed_filetypes']['attachments'].include?('*') }
    )

    before_create do
      write_attribute(:name, convert_to_humanized_name(self.file_name, self.file.ext))
      write_attribute(:file_name, sanitized_filename)
    end

    # Class methods

    class << self

      def find_paginated(params, per_page, order)
        attachments = Attachment.arel_table
        cond = attachments[:name].matches("%#{params[:query]}%").or(attachments[:file_name].matches("%#{params[:query]}%"))
        self.where(cond).page(params[:page] || 1).per(per_page).order(order)
      end

    end

    # Instance methods

    def urlname
      read_attribute :file_name
    end

    # Checks if the attachment is restricted, because it is attached on restricted pages only
    def restricted?
      pages.any? && pages.not_restricted.blank?
    end

    def extension
      file_name.split(".").last
    end
    alias_method :suffix, :extension

    # Returns a css class name for kind of file
    #
    def icon_css_class
      case file_mime_type
        when *ARCHIVE_FILE_TYPES
          then "archive"
        when *AUDIO_FILE_TYPES
          then "audio"
        when *IMAGE_FILE_TYPES
          then "image"
        when *VIDEO_FILE_TYPES
          then "video"
        when "application/x-shockwave-flash"
          then "flash"
        when "image/x-psd"
          then "psd"
        when "text/plain"
          then "text"
        when "application/rtf"
          then "rtf"
        when "application/pdf"
          then "pdf"
        when "application/msword"
          then "word"
        when "application/vnd.ms-excel"
          then "excel"
        when *VCARD_FILE_TYPES
          then "vcard"
        else "file"
      end
    end

  private

    def sanitized_filename
      parts = self.file_name.split('.')
      sfx = parts.pop
      name = convert_to_urlname(parts.join('-'))
      "#{name}.#{sfx}"
    end

  end
end