class Hack < ApplicationRecord
  # status: 0 未发布； 1已发布
  # diffcult: 难度 1：简单；2：中等； 3：困难
  # 编程题
  validates_length_of :name, maximum: 60, message: "不能超过60个字符"
  validates_length_of :description, maximum: 5000, message: "不能超过5000个字符"
  validates_presence_of :description, message: "描述不能为空"
  validates_presence_of :name,  message: "名称不能为空"
  # 测试集
  has_many :hack_sets, ->{order("position asc")}, :dependent => :destroy
  # 代码
  has_many :hack_codes, :dependent => :destroy
  has_many :hack_user_lastest_codes, :dependent => :destroy
  has_many :discusses, as: :dis, dependent: :destroy
  # 点赞
  has_many :praise_treads, as: :praise_tread_object, dependent: :destroy
  # 消息
  has_many :tidings, as: :container
  # 知识点
  has_many :tag_discipline_containers, as: :container, dependent: :destroy

  has_one :exercise_question, dependent: :destroy

  belongs_to :user
  belongs_to :sub_discipline

  has_one :item_bank, as: :container, dependent: :destroy

  scope :published, -> { where(status: 1) }
  scope :unpublish, -> { where(status: 0) }
  scope :opening, -> {where(open_or_not: 1)}
  scope :mine, -> (author_id){ where(user_id: author_id) }

  def language
    if hack_codes.count == 1
      hack_codes.first.language
    else
      hack_codes.pluck(:language).first
    end
  end

  def exercise_course
    exercise_question.present? ? exercise_question&.exercise&.course : nil
  end

  def code
    if hack_codes.count == 1
      #tran_base64_decode64(hack_codes.first.code)
      hack_codes.first.code
    else
      #tran_base64_decode64(hack_codes.pluck(:code))
      hack_codes.pluck(:code)
    end
  end

  # 用于用户调试的第一个测试用例
  def input_test_case
    hack_sets.first&.input
  end

  # 管理员
  def manager?(user)
    user_id == user.id || user.admin_or_business?
  end

  # 复制fork
  def fork
    new_hack = Hack.new
    new_hack.attributes = self.attributes.dup.except("id", "user_id", "status", "identifier", "comments_count", "praises_count",
                                                        "pass_num", "created_at", "updated_at", "hack_user_lastest_codes_count",
                                                        "open_or_not", "submit_num")
    new_hack.user_id = User.current.id
    new_hack.identifier = Util::UUID.generate_identifier(Hack, 8)
    new_hack.fork_id = self.id
    new_hack.save!

    # 创建测试集与代码
    hack_sets.each do |set|
      new_hack.hack_sets.create!(input: set.input, output: set.output, position: set.position)
    end

    # 新建知识点
    tag_discipline_containers.each do |tag|
      new_hack.tag_discipline_containers.create!(tag_discipline_id: tag.tag_discipline_id)
    end

    hack_codes.each do |code|
      new_hack.hack_codes.create!(code: code.code, language: code.language, modify_time: Time.now)
    end
    new_hack
  end

end