class ZipsController < ApplicationController
  before_action :require_login
  before_action :load_homework, only: [:shixun_report]
  before_action :get_exercise, only: [:export_exercises]

  before_action :require_admin_or_teacher

  def shixun_report
    student_work_ids = Array.wrap(params[:student_work_ids])

    service = BatchExportShixunReportService.new(@homework, student_work_ids)

    filename = filename_for_content_disposition(service.filename)
    send_file service.zip, filename: filename, type: 'application/zip'
  rescue BatchExportShixunReportService::Error => ex
    normal_status(-1, ex.message)
  end

  def export_exercises
    @request_url = request.base_url
    exercises = ExportExercisesService.new(@exercise,@ex_users,@request_url)

    file_name = filename_for_content_disposition(exercises.filename)
    send_file exercises.ex_zip, filename: file_name, type: 'application/zip'

  rescue Exception => e
    normal_status(-1, e.message)
  end

  private

  def filename_for_content_disposition(name)
    request.env['HTTP_USER_AGENT'] =~ %r{MSIE|Trident|Edge} ? ERB::Util.url_encode(name) : name
  end

  def require_admin_or_teacher
    return if current_user.teacher_or_admin?(@course)
    normal_status(403, '')
  end

  def get_exercise
    ActiveRecord::Base.transaction do
      begin
        @exercise = Exercise.includes(:exercise_users,:exercise_questions).find_by(id:params[:exercise_id])
        group_id = params[:exercise_group_id]
        if @exercise.blank?
          normal_status(-1,"试卷不存在")
        else
          @course = @exercise.course

          default_ex_users = @exercise.all_exercise_users(current_user.id).exercise_user_committed
          @ex_users =  default_ex_users.limit 2   #仅导出已提交的，截止后则是全部为提交的。
          #可以分班选择
          if group_id.present?
            exercise_students = @course.students.where(course_group_id: group_id)  # 试卷所分班的全部人数
            user_ids = exercise_students.pluck(:user_id).reject(&:blank?).uniq
            @ex_users = @ex_users.where(user_id: user_ids).limit 2
          end

          default_ex_users_size = @ex_users.size

          if default_ex_users_size == 0
            normal_status(-1,"导出失败,暂时没有已提交的学生")
          elsif default_ex_users_size > 100
            normal_status(-1,"导出数量超过100,请分班导出或联系网站管理员导出")
          end
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("导出失败！")
      end
    end
  end

  def load_homework
    @homework = HomeworkCommon.find(params[:homework_common_id])
    @course   = @homework.course
  end
end