# redMine - project management software
# Copyright (C) 2006-2007  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# 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 TimeEntry < ActiveRecord::Base
  # could have used polymorphic association
  # project association here allows easy loading of time entries at project level with one database trip
  belongs_to :project
  belongs_to :issue
  belongs_to :user
  belongs_to :activity, :class_name => 'Enumeration', :foreign_key => :activity_id
  
  attr_protected :project_id, :user_id, :tyear, :tmonth, :tweek
  
  validates_presence_of :user_id, :activity_id, :project_id, :hours, :spent_on
  validates_numericality_of :hours, :allow_nil => true
  validates_length_of :comments, :maximum => 255

  def before_validation
    self.project = issue.project if issue && project.nil?
  end
  
  def validate
    errors.add :hours, :activerecord_error_invalid if hours && (hours < 0 || hours >= 1000)
    errors.add :project_id, :activerecord_error_invalid if project.nil?
    errors.add :issue_id, :activerecord_error_invalid if (issue_id && !issue) || (issue && project!=issue.project)
  end
  
  # tyear, tmonth, tweek assigned where setting spent_on attributes
  # these attributes make time aggregations easier
  def spent_on=(date)
    super
    self.tyear = spent_on ? spent_on.year : nil
    self.tmonth = spent_on ? spent_on.month : nil
    self.tweek = spent_on ? Date.civil(spent_on.year, spent_on.month, spent_on.day).cweek : nil
  end
  
  # Returns true if the time entry can be edited by usr, otherwise false
  def editable_by?(usr)
    (usr == user && usr.allowed_to?(:edit_own_time_entries, project)) || usr.allowed_to?(:edit_time_entries, project)
  end
  
  def self.visible_by(usr)
    with_scope(:find => { :conditions => Project.allowed_to_condition(usr, :view_time_entries) }) do
      yield
    end
  end
end