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const mongoose = require('mongoose');
const bcrypt = require('bcryptjs');

const userSchema = new mongoose.Schema({
  name: {
    type: String,
    trim: true,
    default: ''
  },
  displayName: {
    type: String,
    trim: true,
    default: ''
  },
  username: {
    type: String,
    required: true,
    unique: true,
    trim: true,
    minlength: 3
  },
  email: {
    type: String,
    required: true,
    unique: true,
    trim: true,
    lowercase: true
  },
  password: {
    type: String,
    required: true,
    minlength: 6
  },
  role: {
    type: String,
    enum: ['student', 'instructor', 'admin'],
    default: 'student'
  },
  targetCultures: [{
    type: String,
    trim: true
  }],
  nativeLanguage: {
    type: String,
    trim: true
  },
  createdAt: {
    type: Date,
    default: Date.now
  },
  lastActive: {
    type: Date,
    default: Date.now
  }
});

// Hash password before saving
userSchema.pre('save', async function(next) {
  if (!this.isModified('password')) return next();
  
  try {
    const salt = await bcrypt.genSalt(10);
    this.password = await bcrypt.hash(this.password, salt);
    next();
  } catch (error) {
    next(error);
  }
});

// Method to compare passwords
userSchema.methods.comparePassword = async function(candidatePassword) {
  return bcrypt.compare(candidatePassword, this.password);
};

module.exports = mongoose.model('User', userSchema);