class Task < ActiveRecord::Base
  include Cms::DomainSupport
  belongs_to :assigned_by, :class_name => "User"
  belongs_to :assigned_to, :class_name => "User"
  belongs_to :page
  
  after_create :mark_other_tasks_for_the_same_page_as_complete
  after_create :send_email
  
  named_scope :complete, :conditions => ["completed_at is not null"]
  named_scope :incomplete, :conditions => ["completed_at is null"]
  
  named_scope :for_page, lambda{|p| {:conditions => ["page_id = ?", p]}}
  named_scope :other_than, lambda{|t| {:conditions => ["id != ?", t.id]}}
  
  validates_presence_of :assigned_by_id, :message => "is required"
  validates_presence_of :assigned_to_id, :message => "is required"
  validates_presence_of :page_id, :message => "is required"
  validate :assigned_by_is_able_to_edit_or_publish_content
  validate :assigned_to_is_able_to_edit_or_publish_content
  
  def mark_as_complete!
    update_attributes(:completed_at => Time.now)
  end
  
  def completed?
    !!completed_at
  end
  
  protected
  def mark_other_tasks_for_the_same_page_as_complete
    self.class.for_page(self.page_id.to_i).other_than(self).incomplete.all.each do |t|
      t.mark_as_complete!
    end
  end
  
  def send_email
    #Hmm... what if the assign_by or assign_to don't have email addresses?
    #For now we'll say just don't send an email and log that as a warning
    if assigned_by.email.blank?
      logger.warn "Can't send email for task because assigned by user #{assigned_by.login}:#{assigned_by.id} has no email address"
    elsif assigned_to.email.blank?
      logger.warn "Can't send email for task because assigned to user #{assigned_to.login}:#{assigned_to.id} has no email address"
    else
      if SITE_DOMAIN =~ /^www/
        host = SITE_DOMAIN.sub(/^www\./, "#{cms_domain_prefix}.")
      else
        host = "#{cms_domain_prefix}.#{SITE_DOMAIN}"
      end
      email = EmailMessage.create(
                                  :sender => assigned_by.email,
                                  :recipients => assigned_to.email,
                                  :subject => "Page '#{page.name}' has been assigned to you",
                                  :body => "http://#{host}#{page.path}\n\n#{comment}"
                                  )
    end
    true #don't accidently return false and halt the chain
  end
  
  def assigned_by_is_able_to_edit_or_publish_content
    if assigned_by && !assigned_by.able_to_edit_or_publish_content?
      errors.add(:assigned_by_id, "cannot assign tasks")
    end
  end

  def assigned_to_is_able_to_edit_or_publish_content
    if assigned_to && !assigned_to.able_to_edit_or_publish_content?
      errors.add(:assigned_to_id, "cannot be assigned tasks")
    end
  end

  
end