const { DataTypes } = require("sequelize");
const sequelize = require("../../config/db.config");

const QuizQuestion = sequelize.define("QuizQuestion", {
  question_id:  { type: DataTypes.BIGINT, primaryKey: true, autoIncrement: true },
  uuid:         { type: DataTypes.UUID, defaultValue: DataTypes.UUIDV4, unique: true },

  // polymorphic: belongs to either unit_quiz OR course_assessment
  quiz_id:        { type: DataTypes.BIGINT, allowNull: true },   // → unit_quizzes
  assessment_id:  { type: DataTypes.BIGINT, allowNull: true },   // → course_assessments

  type: {
    type: DataTypes.ENUM("true_false", "multiple_choice", "multi_select"),
    allowNull: false,
  },
  question:    { type: DataTypes.TEXT, allowNull: false },
  explanation: { type: DataTypes.TEXT, allowNull: true },  // shown after answer
  order_index: { type: DataTypes.INTEGER, defaultValue: 0 },
  points:      { type: DataTypes.INTEGER, defaultValue: 1 },
  createdBy:   { type: DataTypes.BIGINT, allowNull: true },
  deletedBy:   { type: DataTypes.BIGINT, allowNull: true },
}, {
  tableName: "quiz_questions",
  timestamps: true,
  paranoid: true,
});

module.exports = QuizQuestion