src/models/User.js

import mongoose from 'mongoose';

const userSchema = new mongoose.Schema({
  googleId: {
    type: String,
    required: true,
    unique: true,
  },
  email: {
    type: String,
    required: true,
    unique: true,
  },
  displayName: String,
  firstName: String,
  lastName: String,
  username: {
    type: String,
    unique: true,
    sparse: true,   // 👈 THIS IS THE FIX
    trim: true,
    minlength: 3,
    maxlength: 30,
  },
  role: { type: String, default: 'user' },
  
  // Profile Details (Filled during Onboarding)
  profile: {
    isComplete: { type: Boolean, default: false },
    college: { type: String, default: '' },
    city: { type: String, default: '' },
    gender: { type: String, enum: ['Male', 'Female', 'Non-binary', ''], default: '' },
    relationshipStatus: { type: String, default: '' },
    photos: [String], // Array of Cloudinary URLs
    bio: { type: String, maxlength: 100 },
    socials: {
      instagram: { type: String, default: '' },
      snapchat: { type: String, default: '' },
      whatsapp: { type: String, default: '' } // Optional per Bible
    }
  },

  // The Cragy Safety Engine
  karma: {
    type: Number,
    default: 60, // Starts in "Normal" range (50-79)
    min: 0,
    max: 100
  },
  
  flags: {
    nsfwCount: { type: Number, default: 0 },
    reportsReceived: { type: Number, default: 0 },
    isBanned: { type: Boolean, default: false }
  },

  // Social Layer
  friends: [{ type: mongoose.Schema.Types.ObjectId, ref: 'User' }],
  friendRequests: [{ type: mongoose.Schema.Types.ObjectId, ref: 'User' }]

}, { timestamps: true });

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