# == Schema Information
# Schema version: 20090115232435
#
# Table name: messages
#
#  id             :integer(4)      not null, primary key
#  sender_id      :integer(4)
#  recipients_ids :text
#  subject        :string(255)     not null
#  body           :text
#  email_state    :integer(4)      default(0), not null
#  private        :boolean(1)
#  created_at     :datetime
#

class Message < ActiveRecord::Base
  belongs_to :sender, :class_name => "User", :foreign_key => "sender_id"

  serialize :recipients_ids, Array
  attr_accessor :sent_to_all, :group_id, :recipients_nicks
  
  named_scope :pending, :conditions => { :email_state => 0 }
  named_scope :sent, :conditions => { :email_state => 1 }
  named_scope :user, :conditions => "sender_id IS NOT NULL", :order => 'created_at DESC', :include => :sender

  # Values for the email_state attribute: :none, :pending, :sent, :failed
  EMAIL_STATE = {
    :pending => 0,
    :sent => 1,
    :failed => 2
  }

  validates_presence_of :recipients_ids, :subject, :body
  validates_length_of :subject, :in => 1..255
  validates_inclusion_of :email_state, :in => EMAIL_STATE.values


  # clean up the recipients_ids
  def before_validation_on_create
    self.recipients_ids = recipients_ids.uniq.reject { |id| id.blank? } unless recipients_ids.nil?
    self.recipients_ids = User.all.collect(&:id) if sent_to_all == 1
  end

  def add_recipients(users)
    self.recipients_ids = [] if recipients_ids.blank?
    self.recipients_ids += users.collect(&:id) unless users.blank?
  end

  def group_id=(group_id)
    @group_id = group_id
    add_recipients Group.find(group_id).users unless group_id.blank?
  end

  def recipients_nicks=(nicks)
    @recipients_nicks = nicks
    add_recipients nicks.split(",").collect { |nick| User.find_by_nick(nick) }
  end

  def recipient=(user)
    @recipients_nicks = user.nick
  end
  
  # Returns true if this message is a system message, i.e. was sent automatically by the FoodSoft itself.
  def system_message?    
    self.sender_id.nil?
  end

  def sender_name
    system_message? ? 'Foodsoft' : sender.nick
  end

  def recipients
    User.find(recipients_ids)
  end
  
  # Sends all pending messages that are to be send as emails.
  def self.send_emails
    messages = Message.pending
    for message in messages
      for recipient in message.recipients
        if recipient.settings['messages.sendAsEmail'] == 1 && !recipient.email.blank?
          Mailer.deliver_message(message)
        end
      end
      message.update_attribute(:email_state, 1)
    end
  end

  # Returns a new message object created from the attributes specified (recipient, recipients, subject)
  # and the body from the given template that can make use of the variables specified.
  # The templates are to be stored in app/views/messages, i.e. the template name 
  # "order_finished" would invoke template file "app/views/messages/order_finished.rhtml".
  # Note: you need to set the sender afterwards if this should not be a system message.
  #
  # Example:
  #   Message.from_template(
  #     'order_finished', 
  #     {:user => user, :group => ordergroup, :order => self, :results => results, :total => group_order.price}, 
  #     {:recipient_id => user.id, :recipients => recipients, :subject => "Bestellung beendet: #{self.name}"}
  #   ).save!
  def self.from_template(template, vars, attributes)
    view = ActionView::Base.new(Rails::Configuration.new.view_path, {}, MessagesController.new)    
    new(attributes.merge(:body => view.render(:file => "messages/#{template}.rhtml", :locals => vars)))
  end
end