require 'patch_like_methods'

class Patch < ActiveRecord::Base
  has_many   :patch_versions, :order => 'created_at'
  has_many   :patch_comments, :order => 'created_at'
  belongs_to :program
  belongs_to :author, :foreign_key => 'created_by', :class_name => 'User'
  validates_presence_of :filename
  validates_presence_of :program_id
  validates_presence_of :created_by
  include PatchLikeMethods

  APPLIED_CONDITION   = "(applied_since_version IS NOT NULL AND applied_since_version <> '')"
  UNAPPLIED_CONDITION = "(applied_since_version IS NULL OR applied_since_version = '')"

  def latest_version
    if patch_versions.empty?
      patch_versions << PatchVersion.create(:comment => 'First version',
                                            :for_upstream_version => 'xxx')
    end
    patch_versions.last
  end
  def text; latest_version.text; end
  def text=(new_text); latest_version.text = new_text; end
  def applied_since_version=(new_version)
    super(new_version.to_s == '' ? nil : new_version)
  end
end