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

const QuizSession = sequelize.define("QuizSession", {
  session_id:    { type: DataTypes.BIGINT, primaryKey: true, autoIncrement: true },
  uuid:          { type: DataTypes.UUID, defaultValue: DataTypes.UUIDV4, unique: true },
  user_id:       { type: DataTypes.BIGINT, allowNull: false },
  quiz_id:       { type: DataTypes.BIGINT, allowNull: false },
  course_id:     { type: DataTypes.BIGINT, allowNull: true },
  unit_id:       { type: DataTypes.BIGINT, allowNull: true },
  status:        { type: DataTypes.STRING(20), allowNull: false, defaultValue: 'in_progress' }, // 'in_progress' | 'submitted'
  draft_answers: { type: DataTypes.JSONB, allowNull: true, defaultValue: null },
  started_at:    { type: DataTypes.DATE, allowNull: false, defaultValue: DataTypes.NOW },
  last_saved_at: { type: DataTypes.DATE, allowNull: true, defaultValue: null },
}, {
  tableName: "quiz_sessions",
  timestamps: true,
});

module.exports = QuizSession;