const mongoose = require("mongoose");

const UserBadgeSchema = new mongoose.Schema(
  {
    user: {
      type: mongoose.Schema.Types.ObjectId,
      ref: "User",
      required: true,
      index: true,
    },
    badge: {
      type: mongoose.Schema.Types.ObjectId,
      ref: "Badge",
      required: true,
      index: true,
    },
    earnedAt: {
      type: Date,
      default: Date.now,
    },
    progress: {
      type: Number,
      default: 0,
    },
  },
  {
    timestamps: true,
  },
);

// Compound unique index to prevent duplicate badge awards
UserBadgeSchema.index({ user: 1, badge: 1 }, { unique: true });

// Index for user badge queries
UserBadgeSchema.index({ user: 1, earnedAt: -1 });

module.exports = mongoose.model("UserBadge", UserBadgeSchema);