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

const userSchema = new mongoose.Schema({
  username: {
    type: String,
    required: true,
    unique: true,
    trim: true,
    minlength: 3,
    maxlength: 30
  },
  email: {
    type: String,
    required: true,
    unique: true,
    trim: true,
    lowercase: true
  },
  password: {
    type: String,
    required: true,
    minlength: 6
  },
  displayName: {
    type: String,
    required: true,
    trim: true,
    maxlength: 50
  },
  avatar: {
    type: String,
    default: null
  },
  bio: {
    type: String,
    maxlength: 500,
    default: ''
  },
  status: {
    type: String,
    enum: ['online', 'offline', 'away', 'busy'],
    default: 'offline'
  },
  lastSeen: {
    type: Date,
    default: Date.now
  },
  settings: {
    theme: {
      type: String,
      enum: ['light', 'dark', 'auto'],
      default: 'auto'
    },
    notifications: {
      enabled: { type: Boolean, default: true },
      sound: { type: Boolean, default: true },
      preview: { type: Boolean, default: true }
    }
  }
}, {
  timestamps: true
});

userSchema.pre('save', async function(next) {
  if (!this.isModified('password')) return next();
  this.password = await bcrypt.hash(this.password, 12);
  next();
});

userSchema.methods.comparePassword = async function(candidatePassword) {
  return await bcrypt.compare(candidatePassword, this.password);
};

userSchema.methods.toJSON = function() {
  const user = this.toObject();
  delete user.password;
  return user;
};

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