'use strict';

/**
 * 试卷题目模型 - ExamQuestion
 *
 * 存储各参赛组别的试卷题目，按组别区分，支持排序。
 * 表名：exam_questions
 */

module.exports = app => {
  const { STRING, TEXT, INTEGER, DATE } = app.Sequelize;

  const ExamQuestion = app.model.define('exam_question', {
    // 主键 ID，自增
    id: {
      type: INTEGER,
      primaryKey: true,
      autoIncrement: true,
      comment: '题目唯一标识',
    },
    // 所属组别：zhongzhi/gaozhi/benke/jiaoshi
    group: {
      type: STRING(20),
      allowNull: false,
      comment: '题目所属组别',
      validate: {
        isIn: [['zhongzhi', 'gaozhi', 'benke', 'jiaoshi']],
      },
    },
    // 题目标题
    title: {
      type: STRING(200),
      allowNull: false,
      comment: '题目标题',
    },
    // 题目详细内容/描述
    content: {
      type: TEXT,
      allowNull: false,
      comment: '题目内容描述',
    },
    // 题目分值
    score: {
      type: INTEGER,
      allowNull: false,
      comment: '题目分值',
    },
    // 排序序号（决定题目在试卷中的展示顺序）
    sort_order: {
      type: INTEGER,
      allowNull: false,
      defaultValue: 0,
      comment: '排序序号',
    },
    // 创建时间
    created_at: {
      type: DATE,
      allowNull: false,
      defaultValue: app.Sequelize.literal('CURRENT_TIMESTAMP'),
      comment: '创建时间',
    },
    // 更新时间
    updated_at: {
      type: DATE,
      allowNull: false,
      defaultValue: app.Sequelize.literal('CURRENT_TIMESTAMP'),
      comment: '更新时间',
    },
  }, {
    tableName: 'exam_questions',
    timestamps: false,
    underscored: true,
    indexes: [
      {
        fields: ['group'],
      },
      {
        fields: ['group', 'sort_order'],
      },
    ],
  });

  return ExamQuestion;
};