# encoding: utf-8

require 'shellwords'

class Vulcano::Plugins::Backend
  autoload :Stat, 'vulcano/plugins/backend_stat'

  class LinuxFile < FileCommon
    attr_reader :path
    def initialize(backend, path)
      @backend = backend
      @path = path
      @spath = Shellwords.escape(@path)
    end

    def content
      return @content if @content_fetched
      @content = @backend.run_command(
        "cat #{@spath} 2>/dev/null || echo -n").stdout
      @content_fetched = true
      return @content unless @content.empty?
      @content = nil if directory? or size.nil? or size > 0
      @content
    end

    def exist?
      @exist ||= (
        @backend.
          run_command("test -e #{@spath}").
          exit_status == 0
      )
    end

    def link_target
      return @link_target unless @link_target.nil?
      return @link_target = nil if link_path.nil?
      @link_target = @backend.file(link_path)
    end

    def link_path
      return nil unless symlink?
      @link_path ||= (
        @backend.
          run_command("readlink #{@spath}").stdout.chomp
      )
    end

    def mounted?
      @mounted ||= (
        !@backend.
          run_command("mount | grep -- ' on #{@spath}'").
          stdout.empty?
      )
    end

    %w{
      type mode owner group mtime size selinux_label
    }.each do |field|
      define_method field.to_sym do
        stat[field.to_sym]
      end
    end

    def product_version
      nil
    end

    def file_version
      nil
    end

    def stat
      return @stat if defined?(@stat)
      @stat = ::Vulcano::Plugins::Backend::Stat.stat(@spath, @backend)
    end
  end
end