const mongoose = require('mongoose');

const qualificationSchema = new mongoose.Schema({
  qualification_number: {
    type: String, required: true, unique: true, trim: true
  },
  student_name: {
    type: String, required: true, trim: true
  },
  program_name: {
    type: String, required: true, trim: true
  },
  department: {
    type: mongoose.Schema.Types.ObjectId, ref: 'Department', required: true
  },
  level: {
    type: mongoose.Schema.Types.ObjectId, ref: 'Level', required: true
  },
  issued_date: {
    type: Date, required: true
  },
  status: {
    type: String, enum: ['active', 'revoked'], default: 'active'
  },
  // Optional personal info
  passport_number: { type: String, trim: true },
  address:         { type: String, trim: true },
  // PhD fields — presence of topic_name signals PhD view on frontend
  topic_name:       { type: String, trim: true },
  topic_short_desc: { type: String, trim: true },
  // Document images (array of filenames)
  degree_image: { type: [String], default: [] }
}, { timestamps: true });

module.exports = mongoose.model('Qualification', qualificationSchema);