// /components/professors/professorModel.js
'use strict';

const mongoose = require('mongoose');

const professorSchema = new mongoose.Schema({
  user: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'User',
    index: true
  },
  bio: {
    type: String,
    trim: true
  },
  expertise: [{
    type: String,
    trim: true
  }],
  courses: [{
    type: mongoose.Schema.Types.ObjectId,
    ref: 'Course'
  }],
  isActive: {
    type: Boolean,
    default: true
  }
}, {
  timestamps: true,
  strict: false,
  toJSON: { virtuals: true },
  toObject: { virtuals: true }
});

// Auto-populate linked user document on find queries unless explicitly skipped
professorSchema.pre(/^find/, function (next) {
  if (this.options?._skipUserPopulate !== true) {
    this.populate({
      path: 'user',
      select: 'name nationalIdCode phoneNumber email cardNumber shabaNumber role isActive'
    });
  }
  next();
});

// Virtual properties delegating personal details to the linked User model with legacy fallback
professorSchema.virtual('name').get(function () {
  if (this.user && typeof this.user === 'object' && this.user.name) {
    return this.user.name;
  }
  return this._doc?.name || undefined;
});

professorSchema.virtual('surname').get(function () {
  if (this.user && typeof this.user === 'object' && this.user.name) {
    const parts = String(this.user.name).trim().split(/\s+/);
    if (parts.length > 1) {
      return parts.slice(1).join(' ');
    }
  }
  return this._doc?.surname || '';
});

professorSchema.virtual('nationalIdCode').get(function () {
  if (this.user && typeof this.user === 'object' && this.user.nationalIdCode) {
    return this.user.nationalIdCode;
  }
  return this._doc?.nationalIdCode || undefined;
});

professorSchema.virtual('phoneNumber').get(function () {
  if (this.user && typeof this.user === 'object' && this.user.phoneNumber) {
    return this.user.phoneNumber;
  }
  return this._doc?.phoneNumber || undefined;
});

professorSchema.virtual('email').get(function () {
  if (this.user && typeof this.user === 'object' && this.user.email) {
    return this.user.email;
  }
  return this._doc?.email || undefined;
});

professorSchema.virtual('cardNumber').get(function () {
  if (this.user && typeof this.user === 'object' && this.user.cardNumber) {
    return this.user.cardNumber;
  }
  return this._doc?.cardNumber || undefined;
});

professorSchema.virtual('shabaNumber').get(function () {
  if (this.user && typeof this.user === 'object' && this.user.shabaNumber) {
    return this.user.shabaNumber;
  }
  return this._doc?.shabaNumber || undefined;
});

module.exports = mongoose.model('Professor', professorSchema);