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

const QuizAttempt = sequelize.define("QuizAttempt", {
  attempt_id:     { type: DataTypes.BIGINT, primaryKey: true, autoIncrement: true },
  uuid:           { type: DataTypes.UUID, defaultValue: DataTypes.UUIDV4, unique: true },
  user_id:        { type: DataTypes.BIGINT, allowNull: false },
  // 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
  course_id:      { type: DataTypes.BIGINT, allowNull: true },   // denormalized — for fast per-course queries
  answers:        { type: DataTypes.JSONB, allowNull: false, defaultValue: {} },
  attempt_number: { type: DataTypes.INTEGER, allowNull: false, defaultValue: 1 }, // 1-based per user+quiz
  total_points:   { type: DataTypes.INTEGER, allowNull: false, defaultValue: 0 },
  earned_points:  { type: DataTypes.INTEGER, allowNull: false, defaultValue: 0 },
  score:          { type: DataTypes.INTEGER, allowNull: false, defaultValue: 0 }, // percentage 0-100
  passing_score:  { type: DataTypes.INTEGER, allowNull: true },  // snapshot at submit time
  passed:         { type: DataTypes.BOOLEAN, allowNull: false, defaultValue: false },
}, {
  tableName: "quiz_attempts",
  timestamps: true,
});

module.exports = QuizAttempt;