const mongoose = require('mongoose');

const visitSchema = new mongoose.Schema(
  {
    // Optional: Track which user visited (if logged in)
    user: {
      type: mongoose.Schema.ObjectId,
      ref: 'User',
      default: null,
    },
    // IP address for basic tracking
    ipAddress: {
      type: String,
      required: true,
    },
    // User agent for device/browser info
    userAgent: {
      type: String,
      default: '',
    },
    // Page visited (optional, for more detailed analytics)
    page: {
      type: String,
      default: '/',
    },
    // Session identifier to avoid counting multiple page views as separate visits
    sessionId: {
      type: String,
      required: true,
      index: true,
    },
    // Number of times this session visited on this day
    count: {
      type: Number,
      default: 1,
    },
    // The timestamp of the most recent interaction in this session
    lastVisitedAt: {
      type: Date,
      default: Date.now,
    },
  },
  {
    timestamps: true, // adds createdAt and updatedAt automatically
    toJSON: { virtuals: true },
    toObject: { virtuals: true },
  },
);

// Virtual field to display user name/id for logged in users, or sessionId for guests
visitSchema.virtual('visitorInfo').get(function () {
  if (
    this.user &&
    typeof this.user === 'object' &&
    (this.user.name || this.user.email)
  ) {
    return this.user.name || this.user.email;
  }
  return this.user ? this.user.toString() : this.sessionId;
});

// Index for faster queries on date ranges
visitSchema.index({ createdAt: 1 });
visitSchema.index({ sessionId: 1, createdAt: 1 });

const Visit = mongoose.model('Visit', visitSchema);

module.exports = Visit;