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

const Certificate = sequelize.define("Certificate", {
  certificate_id: { type: DataTypes.BIGINT,      primaryKey: true, autoIncrement: true },
  uuid:           { type: DataTypes.UUID,         allowNull: false, defaultValue: DataTypes.UUIDV4, unique: true },
  cert_no:        { type: DataTypes.STRING(25),   allowNull: false, unique: true },
  ref_no:         { type: DataTypes.STRING(50),   allowNull: false },
  user_id:        { type: DataTypes.BIGINT,       allowNull: false },
  course_id:      { type: DataTypes.BIGINT,       allowNull: false },
  instructors:    { type: DataTypes.TEXT,         allowNull: true },
  score:          { type: DataTypes.INTEGER,      allowNull: true },
  length_str:     { type: DataTypes.STRING(50),   allowNull: true },
  issued_at:      { type: DataTypes.DATE,         allowNull: false, defaultValue: DataTypes.NOW },
}, {
  tableName:  "certificates",
  timestamps: true,
  createdAt:  "created_at",
  updatedAt:  "updated_at",
  indexes: [
    { unique: true, fields: ["user_id", "course_id"] },
    { fields: ["uuid"] },
    { fields: ["cert_no"] },
  ],
});

module.exports = Certificate;