class Exercise < ActiveRecord::Base
  #exercise_status: 1,新建；2，发布；3，关闭
  include Redmine::SafeAttributes
  belongs_to :user
  belongs_to :course ,:touch => true
  belongs_to :exercise_bank
  has_many :exercise_group_settings, :dependent => :destroy
  has_many :exercise_questions, :dependent => :destroy
  has_many :exercise_users, :dependent => :destroy, :conditions => "exercise_users.is_delete = 0"
  has_many :users, :through => :exercise_users #该测试被哪些用户提交答案过
  has_many :course_acts, :class_name => 'CourseActivity',:as =>:course_act ,:dependent => :destroy
# 课程消息
  has_many :tidings, as: :container, dependent: :destroy
  has_many :course_messages, :class_name =>'CourseMessage', :as => :course_message, :dependent => :destroy

  has_many :exercise_level_settings, :dependent => :destroy
  has_many :exercise_user_questions

  after_create :acts_as_course_message
  def acts_as_course_message
    if self.course
      if self.exercise_status == 2 #未发布
        #self.course.members.each do |m|
          self.course_messages << CourseMessage.create(:user_id => User.current.id, :course_id => self.course_id, :viewed => false,:status=>2)
        #end
      # else
      #   self.course_messages.destroy_all 这里的destory_all值得商榷。因为我这里是通过status来控制不同的status的
      end
    end
  end

  def create_user_question_list exercise_user_id
    self.exercise_questions.where("question_type != 5").each do |question|
      self.exercise_user_questions << ExerciseUserQuestion.new(exercise_user_id: exercise_user_id,
                                                               exercise_question_id: question)
    end
    self.exercise_level_settings.each do |setting|
      # 每个级别中随机挑选num个实训题
      setting.exercise_questions.pluck(:id).sample(setting.num).each do |question_id|
        self.exercise_user_questions << ExerciseUserQuestion.new(exercise_user_id: exercise_user_id,
                                                                 exercise_question_id: question_id)
      end
    end
  end

  def user_question_list exercise_user_id
    if self.exercise_user_questions.where(exercise_user_id: exercise_user_id).count == 0
      self.exercise_questions
    else
      self.exercise_questions.where(id: self.exercise_user_questions.where(exercise_user_id: exercise_user_id).
          pluck(:exercise_question_id))
    end
  end

  def level_setting level
    self.exercise_level_settings.where(level: level).first
  end

  def shixun_question_count
    self.exercise_level_settings.sum(:num)
  end

  def shixun_question_score
    score = 0
    self.exercise_level_settings.each do |setting|
      score += setting.num * setting.score.to_i
    end
    score
  end

  def has_shixun_questions?
    self.exercise_questions.where("question_type = 5 and exercise_level_setting_id != 0").count > 0
  end

  def exercise_question_size
    self.exercise_questions.where("question_type != 5").count + self.shixun_question_count
  end
end