class Subjects::ShixunUsedInfoService < ApplicationService
  attr_reader :subject, :stages
  def initialize(subject)
    @subject = subject
    @stages = subject.stages.includes(shixuns: [myshixuns: :games, homework_commons_shixuns: [homework_common: :course]])
  end

  def call
    shixun_infos = []
    stages.each do |stage|
      position = stage.position
      stage.shixuns.each_with_index do |shixun, index|
        stage = "#{position}-#{index+1}"
        name = shixun.name
        challenge_count = shixun.challenges_count
        course_count = shixun.homework_commons_shixuns.select{|hcs| hcs.homework_common.course_id}.uniq.size
        school_count = shixun.homework_commons_shixuns.select{|hcs| hcs.homework_common.course.school_id}.uniq.size
        used_count = shixun.myshixuns_count
        passed_count = shixun.myshixuns.select{|m| m.status == 1}.size
        evaluate_count = shixun.myshixuns.map{|m| m.games.sum(:evaluate_count).to_i}.sum
        passed_ave_time = (passed_count > 0) ?
                              (shixun.myshixuns.map{|m| m.status == 1 && m.games.sum(:cost_time).to_i}.sum / passed_count) : 0
        shixun_infos << {stage: stage, name: name, challenge_count: challenge_count, course_count: course_count,
                         school_count: school_count, used_count: used_count, passed_count: passed_count,
                         evaluate_count: evaluate_count, passed_ave_time: passed_ave_time}
      end
      shixun_infos
    end
  end

end