class Term < ActiveRecord::Base
  unloadable

  belongs_to :category, :class_name => 'TermCategory', :foreign_key => 'category_id'
  belongs_to :project
  belongs_to :author, :class_name => 'User', :foreign_key => 'author_id'

  validates_presence_of :name, :project
  validates_length_of :name, :maximum => 255

  acts_as_attachable

  acts_as_searchable :columns => ["#{table_name}.name", "#{table_name}.description"],
                        :project_key => [:project]

  acts_as_event :title => Proc.new {|o| "#{l(:glossary_title)} ##{o.id}: #{o.name}" },
                  :description => Proc.new {|o| "#{o.description}"},
                  :datetime => :created_on,
                  :type => 'terms',
                  :url => Proc.new {|o| {:controller => 'glossary', :action => 'show', :id => o.project, :term_id => o.id} }

  attr_accessible :project_id, :category_id, :author, :name, :name_en, :datatype, :codename, :description,
                  :rubi, :abbr_whole
  
  def author
    author_id ? User.find_by_id(author_id) : nil
  end
  
  def updater
    updater_id ? User.find_by_id(updater_id) : nil
  end
  
  def project
    Project.find_by_id(project_id)
  end

  def datetime
    (self[:created_on] != self[:updated_on]) ? self[:updated_on] : self[:created_on]
  end
  
  def value(prmname)
    case prmname
    when 'project'
      (project) ? project.name : ""
    when 'category'
      (category) ? category : ""
    when 'datetime'
      datetime
    else
      self[prmname]
    end
  end

  def param_to_s(prmname)
    if (prmname == 'created_on' or prmname == 'updated_on')
      format_time(self[prmname])
    else
      value(prmname).to_s
    end
  end
  
  def <=>(term)
    id <=> term.id
  end


  def self.compare_safe(a, b, &blk)
    if (!a and !b)
      return 0
    elsif (!a or !b)
      return -1 if a
      return 1 if b
    end
    yield(a,b)
  end

  
  def self.compare_by_param(prm, a, b)
    case prm
    when 'project'
      a.project.identifier <=> b.project.identifier
    when 'category'
      self.compare_safe(a.category, b.category) {|acat, bcat|
        acat.position <=> bcat.position
      }
    when 'datetime'
      self.compare_safe(a.value(prm), b.value(prm)) {|aval, bval|
        (aval <=> bval) * -1
      }      
    when 'name'
      ((a.rubi.empty?) ? a.name : a.rubi) <=> ((b.rubi.empty?) ? b.name : b.rubi)
    else
      self.compare_safe(a.value(prm), b.value(prm)) {|aval, bval|
        aval <=> bval
      }
    end
  end


  
  def to_s
    "##{id}: #{name}"
  end  

  def self.find_for_macro(tname, proj, all_project = false)
    if proj
      term = Term.find_by(:project_id => proj.id, :name => tname)
      return term		if term
    end
    return nil unless all_project
    return self.find_by_name(tname)
  end

  def self.default_show_params
    ['name_en', 'rubi', 'abbr_whole', 'datatype', 'codename', 'project', 'category']
  end

  def self.default_searched_params
    ['name', 'name_en', 'abbr_whole', 'datatype', 'codename', 'description']
  end

  def self.default_sort_params
    ['id', 'name', 'name_en', 'abbr_whole', 'datatype', 'codename', 'project', 'category',
     'datetime']
  end

  def self.hidable_params
    ['name_en', 'rubi', 'abbr_whole', 'datatype', 'codename']
  end

  def self.setting_params
    ['name_en', 'rubi', 'abbr_whole', 'datatype', 'codename']
  end

  def self.export_params
    ['id','project',
     'name', 'name_en', 'rubi', 'abbr_whole', 'category', 'datatype', 'codename',
     'author',  'updater', 'created_on', 'updated_on',
     'description']
  end

  def self.import_params
    ['name', 'name_en', 'rubi', 'abbr_whole', 'category', 'datatype', 'codename',
     'description']
  end
                  
  
  
end