#-- copyright
# OpenProject Costs Plugin
#
# Copyright (C) 2009 - 2014 the OpenProject Foundation (OPF)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#++

class MaterialBudgetItem < ActiveRecord::Base
  unloadable

  belongs_to :cost_object
  belongs_to :cost_type

  validates_length_of :comments, :maximum => 255, :allow_nil => true
  validates_presence_of :cost_type

  include ActiveModel::ForbiddenAttributesProtection

  def self.visible_condition(user, project)
    Project.allowed_to_condition(user,
                                 :view_cost_rates,
                                 :project => project)
  end

  scope :visible_costs, lambda{|*args|
    { :include => [{:cost_object => :project}],
      :conditions => MaterialBudgetItem.visible_condition((args.first || User.current), args[1])
    }
  }

  def costs
    self.budget || self.calculated_costs
  end

  def calculated_costs(fixed_date = cost_object.fixed_date)
    if units && cost_type && rate = cost_type.rate_at(fixed_date)
      rate.rate * units
    else
      0.0
    end
  end

  def costs_visible_by?(usr)
    usr.allowed_to?(:view_cost_rates, cost_object.project)
  end
end