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

// Schema für Eltern/Familie
const userSchema = new mongoose.Schema({
  email: {
    type: String,
    required: true,
    unique: true,
    lowercase: true,
    trim: true
  },
  password: {
    type: String,
    required: true,
    minlength: 6
  },
  familyName: {
    type: String,
    required: true,
    trim: true
  },
  parentName: {
    type: String,
    required: true,
    trim: true
  },
  role: {
    type: String,
    enum: ['parent', 'admin'],
    default: 'parent'
  },
  isActive: {
    type: Boolean,
    default: true
  },
  preferences: {
    notifications: {
      type: Boolean,
      default: true
    },
    language: {
      type: String,
      default: 'de'
    },
    theme: {
      type: String,
      enum: ['light', 'dark'],
      default: 'light'
    }
  },
  createdAt: {
    type: Date,
    default: Date.now
  },
  lastLogin: {
    type: Date,
    default: Date.now
  }
});

// Passwort hashen vor dem Speichern
userSchema.pre('save', async function(next) {
  // Nur hashen wenn Passwort geändert wurde
  if (!this.isModified('password')) return next();
  
  try {
    // Passwort hashen
    const salt = await bcrypt.genSalt(10);
    this.password = await bcrypt.hash(this.password, salt);
    next();
  } catch (error) {
    next(error);
  }
});

// Methode zum Passwort-Vergleich
userSchema.methods.comparePassword = async function(candidatePassword) {
  return await bcrypt.compare(candidatePassword, this.password);
};

// Virtuelle Eigenschaft für Kinder-Anzahl
userSchema.virtual('childrenCount', {
  ref: 'Child',
  localField: '_id',
  foreignField: 'parent',
  count: true
});

// JSON-Ausgabe anpassen (Passwort ausblenden)
userSchema.methods.toJSON = function() {
  const user = this.toObject();
  delete user.password;
  return user;
};

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