class Workgroup < Group
  
  has_many :tasks
  # returns all non-finished tasks
  has_many :open_tasks, :class_name => 'Task', :conditions => ['done = ?', false], :order => 'due_date ASC'

  validates_presence_of :task_name, :weekday, :task_required_users,
    :if => Proc.new {|workgroup| workgroup.weekly_task }
  validate :last_admin_on_earth, :on => :update
  before_destroy :check_last_admin_group


  def self.weekdays
    [["Montag", "1"], ["Dienstag", "2"], ["Mittwoch","3"],["Donnerstag","4"],["Freitag","5"],["Samstag","6"],["Sonntag","0"]]
  end

  # Returns an Array with date-objects to represent the next weekly-tasks
  def next_weekly_tasks(number = 8)
    # our system starts from 0 (sunday) to 6 (saturday)
    # get difference between groups weekday and now
    diff = self.weekday - Time.now.wday 
    if diff >= 0  
      # weektask is in current week
      nextTask = diff.day.from_now
    else
      # weektask is in the next week
      nextTask = (diff + 7).day.from_now
    end
    # now generate the Array
    nextTasks = Array.new
    number.times do
      nextTasks << nextTask.to_date
      nextTask = 1.week.from_now(nextTask)
    end
    return nextTasks
  end

  def task_attributes(date)
    {
        :name => task_name,
        :description => task_description,
        :due_date => date,
        :required_users => task_required_users,
        :duration => task_duration,
        :weekly => true
    }
  end

  protected

  # Check before destroy a group, if this is the last group with admin role
  def check_last_admin_group
    if role_admin && Workgroup.where(:role_admin => true).size == 1
      raise "Die letzte Gruppe mit Admin-Rechten darf nicht gelöscht werden"
    end
  end

  # add validation check on update
  # Return an error if this is the last group with admin role and role_admin should set to false
  def last_admin_on_earth
    if !role_admin  && Workgroup.where(:role_admin => true, :id.ne => id).empty?
      errors.add(:role_admin, "Der letzten Gruppe mit Admin-Rechten darf die Admin-Rolle nicht entzogen werden")
    end
  end
  
end

# == Schema Information
#
# Table name: groups
#
#  id                  :integer(4)      not null, primary key
#  type                :string(255)     default(""), not null
#  name                :string(255)     default(""), not null
#  description         :string(255)
#  account_balance     :decimal(8, 2)   default(0.0), not null
#  account_updated     :datetime
#  created_on          :datetime        not null
#  role_admin          :boolean(1)      default(FALSE), not null
#  role_suppliers      :boolean(1)      default(FALSE), not null
#  role_article_meta   :boolean(1)      default(FALSE), not null
#  role_finance        :boolean(1)      default(FALSE), not null
#  role_orders         :boolean(1)      default(FALSE), not null
#  weekly_task         :boolean(1)      default(FALSE)
#  weekday             :integer(4)
#  task_name           :string(255)
#  task_description    :string(255)
#  task_required_users :integer(4)      default(1)
#  deleted_at          :datetime
#  contact_person      :string(255)
#  contact_phone       :string(255)
#  contact_address     :string(255)
#  stats               :text
#  task_duration       :integer(4)      default(1)
#