/***********************************************************************************************************************************************************************
 * File Name: pending_certificate.mdl.js
 * Type of Program: Model
 * Description: Holds certificates queued for issuance after a 5-minute delay
 *              following a passed course assessment. The cron job
 *              (cron/jobs/issue_certificates.cron.js) runs hourly on the hour
 *              and processes rows where issue_at <= NOW().
 *
 * Author: Kenneth Obsequio (@lash0000)
 * Date Created: Jun. 24, 2026
 ***********************************************************************************************************************************************************************/
const { DataTypes } = require('sequelize');
const sequelize     = require('../../config/db.config');

const PendingCertificate = sequelize.define('PendingCertificate', {
  pending_id:   { type: DataTypes.BIGINT,     primaryKey: true, autoIncrement: true },
  user_id:      { type: DataTypes.BIGINT,     allowNull: false },
  course_id:    { type: DataTypes.BIGINT,     allowNull: false },
  course_uuid:  { type: DataTypes.STRING(36), allowNull: false },
  course_title: { type: DataTypes.TEXT,       allowNull: true  },
  passed_at:    { type: DataTypes.DATE,       allowNull: false },
  issue_at:     { type: DataTypes.DATE,       allowNull: false },
  processed_at: { type: DataTypes.DATE,       allowNull: true  },
}, {
  tableName:  'pending_certificates',
  timestamps: true,
  indexes: [
    { fields: ['user_id'] },
    { fields: ['issue_at'] },
    { unique: true, fields: ['user_id', 'course_id'] },
  ],
});

module.exports = PendingCertificate;