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

const userSchema = new mongoose.Schema({
  username: {
    type: String,
    required: true,
    unique: true,
    trim: true
  },
  password: {
    type: String,
    required: true
  },
  role: {
    type: String,
    enum: ['admin'],
    default: 'admin'
  }
}, {
  timestamps: true
});

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

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

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