import mongoose from 'mongoose';
import bcrypt from '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
  },
  role: { 
    type: String, enum: ['user', 'admin'], default: 'user' }
}, {
  timestamps: true
});

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);
  }
});

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

export default mongoose.model('User', userSchema);