module ExportHelper
  include ApplicationHelper
  require "base64"
  require 'zip'

  # 附件导出最大值
  MAX_DOWN_SIZE = 500 * 1024 * 1024
  SAVE_FOLDER = "#{Rails.root}/files"
  OUTPUT_FOLDER = "#{Rails.root}/files/archiveZip"
  MAX_PATH = 50

  # 作业导出为xlsx，homework_type 1：普通作业  2：编程作业（弃用） 3：分组作业  4：实训作业
  def student_work_to_xlsx(works,homework)
    @work_head_cells = []
    @work_cells_column = []
    course = homework.course
    head_cells_format = %w(序号 登录名 真实姓名 邮箱 学号 分班 提交状态)
    allow_late_boolean = homework.allow_late
    if allow_late_boolean  #允许迟交
      allow_late_cell = ["迟交扣分"]
    else
      allow_late_cell = []
    end
    if homework.homework_type != "practice"    #普通作业/分组作业
      homework_type_name = homework.homework_type
      if homework_type_name == "group"   #分组作业
        group_cells = ["关联项目"]
      else
        group_cells = []
      end
      normal_head_cells = %w(作品描述 教师评分 教辅评分)
      anon_boolean = homework.anonymous_comment
      if anon_boolean
        head_cells_add = %w(匿名评分 缺评扣分 违规匿评申诉扣分)
      else
        head_cells_add = []
      end
      normal_head_b_cells = %w(最终成绩 提交时间 更新时间 评语)
      @work_head_cells = (head_cells_format + group_cells + normal_head_cells + head_cells_add + allow_late_cell + normal_head_b_cells).reject(&:blank?)
      works.includes(user: :user_extension, student_works_scores: :user).each_with_index do |w, index|
        w_user = w.user
        w_1 = (index + 1)
        if w_user.present?
          w_2 = w_user&.login
          w_3 = w_user&.real_name
          w_3_1 = w_user&.mail
          w_4 = w_user.student_id.present? ? w_user.student_id : "--"
        else
          w_2 = "--"
          w_3 = "--"
          w_3_1 = "--"
          w_4 = "--"
        end
        course_name = course.students.find_by(user_id: w.user_id).try(:course_group_name)
        w_5 = course_name.present? ? course_name : "--"
        #0： 未提交， 1 按时提交， 2 延迟提交
        if w.work_status == 0
          w_6 = "未提交"
        elsif w.work_status == 1
          w_6 = "按时提交"
        elsif w.work_status == 2
          w_6 = "延迟提交"
        else
          w_6 = "--"
        end
        if homework_type_name == "group"
          project_name = w.project
          if project_name.present?
            w_7 = w.project.name
          else
            w_7 = "--"
          end
        else
          w_7 = nil
        end
        w_8 = w.description.present? ? strip_html(w.description) : "--"
        w_9 = w.teacher_score.nil? ? "未评分" : w.teacher_score.round(1)
        w_10 = w.teaching_asistant_score.nil? ? "未评分" : w.teaching_asistant_score.round(1)
        if anon_boolean
          w_11 = w.student_score.nil? ? "未评分" : w.student_score.round(1)
          w_12 = (homework.teacher_priority == 1 && !w.teacher_score.nil?) ? 0 : w.absence_penalty  #缺评扣分
          home_work_de = homework.homework_detail_manual
          w_13 = home_work_de.present? ? home_work_de.appeal_penalty : "--"  #违规匿评申诉扣分
        else
          w_11,w_12,w_13 = nil
        end
        if allow_late_boolean  #允许迟交
          w_14 = (homework.teacher_priority == 1 && !w.teacher_score.nil?) ? 0 : w.late_penalty  #迟交扣分
        else
          w_14 = nil
        end
        w_15 = w.work_score.nil? ? "未评分" : w.work_score.round(1)
        w_16 = w.commit_time ? format_time(w.commit_time) : "--"
        w_17 = w.update_time ? format_time(w.update_time) : "--"
        teacher_comments = w.student_works_scores
        if teacher_comments.present?
          w_18 = ""
          teacher_comments.each do |t|
            user_name = t.user&.real_name
            user_time = format_time(t.updated_at)
            user_score = t&.score
            user_comment = t.comment.present? ? t.comment : "--"
            comment_title = "#{user_name}： #{user_time.to_s}  #{user_score.to_s}分\n#{user_comment}\n\n"
            w_18 = w_18 + comment_title
          end
        else
          w_18 = "--"
        end

        row_cells_column = [w_1,w_2,w_3,w_3_1,w_4,w_5,w_6,w_7,w_8,w_9,w_10,w_11,w_12,w_13,w_14,w_15,w_16,w_17,w_18]
        row_cells_column = row_cells_column.reject(&:blank?)
        @work_cells_column.push(row_cells_column)
      end
    else   #实训题
      shixun = homework.shixuns.first
      shixun_head_cells = %w(完成情况 通关时间 总耗时 总评测次数 获得经验值 关卡得分)
      eff_boolean = homework.work_efficiency
      if eff_boolean
        eff_score_cell = ["效率分"]
      else
        eff_score_cell = []
      end
      if allow_late_boolean  #允许迟交
        eff_score_cell.push("迟交扣分")
      end
      shixun_time_cells = %w(最终成绩 更新时间 提交耗时 评语)
      @work_head_cells = (head_cells_format + shixun_head_cells + eff_score_cell + shixun_time_cells).reject(&:blank?)
      works.includes(:student_works_scores, user: :user_extension, myshixun: :games).each_with_index do |w, index|
        myshixun = w.try(:myshixun)
        w_user = w.user
        w_1 = (index + 1)
        w_2 = w_user.login
        w_3 = w_user.real_name
        w_3_1 = w_user.mail
        w_4 = w_user.student_id.present? ? w_user.student_id : "--"
        course_name = course.students.find_by(user_id: w.user_id).try(:course_group_name)
        w_5 = course_name.present? ? course_name : "--"
        #0： 未提交， 1 按时提交， 2 延迟提交
        if w.work_status == 0
          w_6 = "未提交"
        elsif w.work_status == 1
          w_6 = "按时提交"
        elsif w.work_status == 2
          w_6 = "延迟提交"
        else
          w_6 = "--"
        end
        w_7 = w.work_status == 0 ? '--' : myshixun.try(:passed_count).to_s+"/"+shixun.challenges_count.to_s
        w_8 = myshixun ? myshixun.try(:passed_time) == "--" ? "--" : format_time(myshixun.try(:passed_time)) : "--"  # 通关时间
        w_9 = myshixun ? (myshixun.try(:passed_count) > 0 ? myshixun.total_spend_time : '--') : "--"  #总耗时
        w_10 = myshixun ? myshixun.output_times : 0  #评测次数
        w_11 = myshixun ? myshixun.total_score : "--"  #获得经验值
        w_12 = w.final_score.present? ? w.final_score : 0
        if eff_boolean
          w_13 = w.eff_score
        else
          w_13 = nil
        end
        if allow_late_boolean  #允许迟交
          w_14 = w.late_penalty  #迟交扣分
        else
          w_14 = nil
        end
        w_15 = w.work_score.nil? ? "--" : w.work_score.round(1)
        w_16 = w.update_time ? format_time(w.update_time) : "--"  "更新时间"
        w_17 = w.cost_time
        teacher_comments = w.student_works_scores
        if teacher_comments.present?
          w_18 = ""
          teacher_comments.each do |t|
            user_name = t.user&.real_name
            user_time = format_time(t.updated_at)
            user_score = t&.score
            user_comment = t.comment.present? ? t.comment : "--"
            comment_title = "#{user_name}： #{user_time.to_s}  #{user_score.to_s}分\n#{user_comment}\n\n"
            # ("教师:" + user_name + "\n" + "时间:" + user_time.to_s + "\n" + "分数:" + user_score.to_s + "分" + "\n" + "评语:" + user_comment + "\n\n")
            w_18 = w_18 + comment_title
          end
        else
          w_18 = "--"
        end
        row_cells_column = [w_1,w_2,w_3,w_3_1,w_4,w_5,w_6,w_7,w_8,w_9,w_10,w_11,w_12,w_13,w_14,w_15,w_16,w_17,w_18]
        row_cells_column = row_cells_column.reject(&:blank?)
        @work_cells_column.push(row_cells_column)
      end
    end
  end

  #毕设任务的导出
  def graduation_work_to_xlsx(items,task,current_user)
    head_cells_format = %w(序号 登录名 真实姓名 邮箱 学号 分班)
    task_type_boolean = task.task_type == 2
    if task_type_boolean   #是否分组
      head_cells_format = head_cells_format + ["分组"]
    end
    head_cells_format = head_cells_format + ["提交状态"]
    task_project_boolean = task.base_on_project
    if task_project_boolean  #关联项目
      head_cells_format = head_cells_format + ["关联项目"]
    end

    head_cells_format = head_cells_format + %w(作品描述 教师评分)

    task_comment_boolean = task.cross_comment
    if task_comment_boolean  #是否交叉评阅
      head_cells_format = head_cells_format + ["交叉评分"]
    end

    head_cells_format = head_cells_format + %w(迟交扣分 最终成绩 提交时间 更新时间 评语)

    @head_cells_column = head_cells_format
    @task_cells_column = []

    items.includes(user: :user_extension).each_with_index do |work,index|
      w_1 = (index+1)
      w_user = work.user
      w_2 = w_user.login
      w_3 = w_user.real_name
      w_3_1 = w_user.mail
      w_4 = w_user.student_id.present? ? w_user.student_id : "--"
      w_5 = work.class_grouping_name
      if task_type_boolean   #是否分组
        w_6 = work.grouping_name
      else
        w_6 = nil
      end
      w_status = work.work_status.to_i
      if w_status == 0
        w_7 = "未提交"
      elsif w_status == 1
        w_7 = "按时提交"
      elsif w_status == 2
        w_7 = "延时提交"
      else
        w_7 = "--"
      end
      if task_project_boolean  #关联项目
        w_project = project_info work, current_user, @user_course_identity   #因为课堂引用了export_helper
        w_8 = w_project[:name]
      else
        w_8 = nil
      end

      if work.description
        w_9 = strip_html work.description
      else
        w_9 = "--"
      end

      w_10 = work.teacher_score.nil? ? "未评分" : work.teacher_score.round(1)
      if task_comment_boolean  #是否交叉评阅
        w_11 = work.cross_score.nil? ? "未评分" : work.cross_score.round(1)
      else
        w_11 = nil
      end
      w_12 = work.late_penalty
      w_13 = work.work_score.nil? ? "未评分" : work.work_score.round(1)
      w_14 = work.commit_time.present? ? format_time(work.commit_time) : "--"
      w_15 = work.update_time.present? ? format_time(work.update_time) : "--"
      teacher_comments = work.graduation_work_scores
      if teacher_comments.present?
        w_16 = ""
        teacher_comments.each do |t|
          user_name = t.user&.real_name
          user_time = format_time(t.updated_at)
          user_score = t&.score
          user_comment = t.comment.present? ? t.comment : "--"
          comment_title = "#{user_name}： #{user_time.to_s}  #{user_score.to_s}分\n#{user_comment}\n\n"
          # ("教师:" + user_name + "\n" + "时间:" + user_time.to_s + "\n" + "分数:" + user_score.to_s + "分" + "\n" + "评语:" + user_comment + "\n\n")
          w_16 = w_16 + comment_title
        end
      else
        w_16 = "--"
      end
      row_cells_column = [w_1,w_2,w_3,w_3_1,w_4,w_5,w_6,w_7,w_8,w_9,w_10,w_11,w_12,w_13,w_14,w_15,w_16]

      row_cells_column = row_cells_column.reject(&:blank?)
      @task_cells_column.push(row_cells_column)
    end
  end

  #试卷的导出
  def get_export_users(exercise,course,export_ex_users)
    question_types = exercise.exercise_questions.pluck(:question_type).uniq
    @table_columns = %w(序号 登录名 真实姓名 邮箱 学号 分班 提交状态)
    @user_columns = []
    ques_type_boolean = question_types.include?(4)
    if ques_type_boolean  #仅存在主观题或客观题的时候
      @table_columns = @table_columns + %w(客观题成绩 主观题成绩 最终成绩 开始答题时间 提交时间)
    else
      @table_columns = @table_columns + %w(最终成绩 开始答题时间 提交时间)
    end
    export_ex_users.includes(user: :user_extension).each_with_index do |e_user,index|
      user_info = e_user.user
      member = course.students.find_by_user_id(e_user.user_id)
      user_course = member.try(:course_group_name)
      user_obj_score = e_user.objective_score < 0.0 ? 0.0 : e_user.objective_score.round(1).to_s
      user_suj_score = e_user.subjective_score < 0.0 ? 0.0 : e_user.subjective_score.round(1).to_s
      user_score = e_user.score.present? ? e_user.score.round(1).to_s : 0.0
      if e_user.commit_status.present? && e_user.commit_status == 1
        user_commit_stu = "按时提交"
      else
        user_commit_stu = "未提交"
      end
      user_start_time = e_user.start_at.present? ? e_user.start_at.strftime('%Y-%m-%d %H:%M') : "--"
      user_end_time = e_user.end_at.present? ? e_user.end_at.strftime('%Y-%m-%d %H:%M') : "--"
      user_student_id = user_info.student_id.present? ? user_info.student_id : "--"

      user_option = [index+1,user_info.login,user_info.real_name, user_info.mail || '--',
                     user_student_id,user_course,user_commit_stu]
      if ques_type_boolean
        other_user_option = [user_obj_score,user_suj_score,user_score,user_start_time,user_end_time]
      else
        other_user_option = [user_score,user_start_time,user_end_time]
      end
      user_option = user_option + other_user_option
      @user_columns.push(user_option)
    end
  end

  #毕设选题的导出
  def graduation_topic_to_xlsx(students,course)
    @topic_head_cells = %w(序号 登录名 真实姓名 邮箱 学号 分班 课题名称 指导教师 教师职位 设计 论文 创作 生产/社会实际 结合科研 其它 真题 模拟题 纵向课题 横向课题 自选 新题 往届题，有新要求
                           往届题，无新要求 课题来源单位 调研或实习地点 确认结果)

    @topic_body_cells = []
    if students.count > 0
      students.includes(user: :user_extension).each_with_index do |student, index|
        user = student.user
        student_topic = course.student_graduation_topics.user_topics_accept(user.id).first
        if student_topic.present?
          topic = student_topic.graduation_topic
        else
          student_topic = nil
          topic = nil
        end
        w_1 = (index+1)
        w_2 = user.login
        w_3 = user.real_name
        w_3_1 = user.mail
        w_4 = user.student_id
        w_5 = student.course_group_name
        w_6 = topic.present? ? topic.name : "--"
        w_7 = topic.present? ? topic.teacher.full_name : "--"
        w_8 = topic.present? ? topic.teacher.identity : "--"

        if topic.present?
          w_9 = topic.topic_type == 1 ? "√" : ""
          w_10 = topic.topic_type == 2 ? "√" : ""
          w_11 = topic.topic_type == 3 ? "√" : ""
          w_12 = topic.topic_source == 1 ? "√" : ""
          w_13 = topic.topic_source == 2 ? "√" : ""
          w_14 = topic.topic_source == 3 ? "√" : ""
          w_15 = topic.topic_property_first == 1 ? "√" : ""
          w_16 = topic.topic_property_first == 2 ? "√" : ""
          w_17 = topic.topic_property_second == 1 ? "√" : ""
          w_18 = topic.topic_property_second == 2 ? "√" : ""
          w_19 = topic.topic_property_second == 3 ? "√" : ""
          w_20 = topic.topic_repeat == 1 ? "√" : ""
          w_21 = topic.topic_repeat == 2 ? "√" : ""
          w_22 = topic.topic_repeat == 3 ? "√" : ""
          w_23 = topic.source_unit
          w_24 = "#{topic.province}#{topic.city}"
        else
          w_9,w_10,w_11,w_12,w_13,w_14,w_15,w_16,w_17,w_18,w_19,w_20,w_21,w_22,w_23,w_24 = "--"
        end
        if student_topic.present?
          w_25 = student_topic.status == 0 ? "待确认" : "已同意"
        else
          w_25 = "--"
        end
        student_info_array = [w_1,w_2,w_3,w_3_1,w_4,w_5,w_6,w_7,w_8,w_9,w_10,w_11,w_12,w_13,w_14,w_15,w_16,w_17,w_18,w_19,w_20,w_21,w_22,w_23,w_24,w_25]
        @topic_body_cells.push(student_info_array)
      end
    end
  end

  def encode64(str)
    Base64.urlsafe_encode64(str)
  end

  def decode64(str)
    Base64.urlsafe_decode64(str)
  end

  # 检测文件大小是否超过500m
  def checkfileSize(works)
    file_count = 0
    file_size = 0
    works.each do |work|
      file_count += work.attachments.count
      work.attachments.each do |attach|
        file_size += attach.filesize
      end
    end

    if file_size > MAX_DOWN_SIZE
      status = -2
    elsif file_count > 0
      status = 0
    else
      status = -1
    end
    status
  end

  def zip_homework_common homework_common, student_works
    bid_homework_path = []
    digests = []
    student_works.each do |work|
      unless work.attachments.empty?
        out_file = zip_student_work_by_user(work, homework_common)

        bid_homework_path << out_file.file_path
        digests << out_file.file_digest
      end
    end

    out_file_name = "#{Time.now.to_i}_#{homework_common.name}.zip"
    out_file_name.gsub!(" ", "-")
    out_file_name.gsub!("/", "_")
    out_file = find_or_pack(homework_common, homework_common.user_id, digests.sort){
      zipping(out_file_name, bid_homework_path, OUTPUT_FOLDER)
    }

    [{files:[out_file.file_path], count: 1, index: 1,
      real_file: out_file.file_path,
      file: File.basename(out_file.file_path),
      base64file: encode64(File.basename(out_file.file_path)),
      size:(out_file.pack_size / 1024.0 / 1024.0).round(2)
     }]
  end

  def zip_student_work_by_user(work, object)
    homeworks_attach_path = []
    not_exist_file = []
    filename = []
    # 需要将所有homework.attachments遍历加入zip
    digests = []
    work.attachments.each do |attach|
      if File.exist?(attach.diskfile)
        homeworks_attach_path << attach.diskfile
        digests << attach.digest
        filename << attach.filename
      else
        not_exist_file << attach.filename
        digests << 'not_exist_file'
        filename << attach.filename
      end
    end

    #单个文件的话,不需要压缩,只改名
    if homeworks_attach_path.size == 1
      out_file = find_or_pack(object, work.user_id, digests.sort){
        des_path = "#{OUTPUT_FOLDER}/#{make_zip_name(work, filename.first)}_#{File.basename(homeworks_attach_path.first)}"
        FileUtils.cp homeworks_attach_path.first, des_path
        des_path
      }
    else
      out_file = find_or_pack(object, work.user_id, digests.sort){
        zipping("#{make_zip_name(work)}.zip",
                homeworks_attach_path, OUTPUT_FOLDER, true, not_exist_file)
      }
    end
    out_file

  end

  def find_or_pack(homework, user_id, digests)
    raise "please given a pack block" unless block_given?

    out_file = ZipPack.packed?(homework, user_id, digests.sort)

    unless out_file && out_file.file_valid?
      file = yield

      ZipPack.where(container_id: homework.id, container_type: homework.class.to_s, user_id: user_id).delete_all

      out_file = ZipPack.create(container_id: homework.id,
                                container_type: homework.class.to_s,
                                user_id: user_id,
                                file_digest: Educoder::Utils.digest(file),
                                file_path: file,
                                pack_size: File.size(file),
                                file_digests: digests.join(',')
      )
    else
      out_file.pack_times = out_file.pack_times + 1
      out_file.save
    end

    out_file
  end

  def make_zip_name(work, file_name="")
    Rails.logger.info("######################file_name: #{file_name}")
    name = file_name === "" ? "" : (file_name[0, file_name.rindex('.')]+"_")
    "#{name}#{work.user.real_name}_#{((work.user.student_id.nil?) ? "" : work.user.student_id)}"
  end

  def zipping(zip_name_refer, files_paths, output_path, is_attachment=false, not_exist_file=[])
    rename_zipfile = zip_name_refer ||= "#{Time.now.to_i.to_s}.zip"
    # 文件名过长

    if rename_zipfile.size > MAX_PATH
      rename_zipfile = rename_zipfile[0,rename_zipfile.size-4][0,MAX_PATH-4] + rename_zipfile[-4,4]
    end

    zipfile_name = "#{output_path}/#{rename_zipfile}"

    # 同名文件重命名时用
    index = 1
    Dir.mkdir(File.dirname(zipfile_name)) unless File.exist?(File.dirname(zipfile_name))
    Zip::File.open(zipfile_name, Zip::File::CREATE) do |zipfile|
      files_paths.each do |filename|
        rename_file = File.basename(filename)
        rename_file = filename_to_real( File.basename(filename)) if is_attachment

        begin
          zipfile.add(rename_file, filename)
        rescue Exception => e
          rename_file = rename_same_file(rename_file, index)
          index += 1
          zipfile.add(rename_file, filename)

          # zipfile.get_output_stream('FILE_NOTICE.txt'){|os| os.write "该作品中有重复命名文件，请通过文件名学号和姓名信息进入该作业详细界面手动下载"}
          next
        end
      end
      unless not_exist_file.empty?
        zipfile.get_output_stream('FILE_LOST.txt'){|os| os.write "以下文件无法成功下载，请联系相关人员重新上传：" +
                                                                     not_exist_file.join(',').to_s}
      end
    end
    zipfile_name
  end

  def filename_to_real(name)
    attach = Attachment.find_by_disk_filename(name)
    attach.filename
  end

  def format_sheet_name name
    name = name.gsub(":", "-")
  end

  def rename_same_file(name, index)
    basename = File.basename(name, ".*")
    new_basename = basename + "_" + index.to_s
    extname = File.extname(name)
    new_basename + extname
  end
end