import mongoose from "mongoose";

const PromoUsageSchema = new mongoose.Schema(
  {
    userId: {
      type: mongoose.Schema.Types.ObjectId,
      ref: "User",
      required: true,
    },
    promoId: {
      type: String,
      required: true,
    },
    promoCode: {
      type: String,
      default: null,
    },
    promoName: {
      type: String,
      required: true,
    },
    promoType: {
      type: String,
      enum: ["deposit_bonus", "discount", "free_item", "custom"],
      required: true,
    },
    // Bonus received
    bonusAmount: {
      type: Number,
      default: 0,
    },
    discountAmount: {
      type: Number,
      default: 0,
    },
    // Context of usage
    transactionId: {
      type: mongoose.Schema.Types.ObjectId,
      ref: "Transaction",
      default: null,
    },
    depositAmount: {
      type: Number,
      default: 0,
    },
    // Metadata
    usedAt: {
      type: Date,
      default: Date.now,
    },
    ipAddress: {
      type: String,
      default: null,
    },
  },
  { timestamps: true }
);

// Index for quick lookups
PromoUsageSchema.index({ userId: 1, promoId: 1 });
PromoUsageSchema.index({ promoId: 1 });
PromoUsageSchema.index({ userId: 1 });

// Static method to check if user has used a promo
PromoUsageSchema.statics.hasUserUsedPromo = async function (userId, promoId) {
  const usage = await this.findOne({ userId, promoId });
  return !!usage;
};

// Static method to get user's promo usage count
PromoUsageSchema.statics.getUserPromoCount = async function (userId, promoId) {
  return await this.countDocuments({ userId, promoId });
};

// Static method to get total promo usage count
PromoUsageSchema.statics.getPromoTotalUses = async function (promoId) {
  return await this.countDocuments({ promoId });
};

// Static method to get promo usage stats
PromoUsageSchema.statics.getPromoStats = async function (promoId) {
  const stats = await this.aggregate([
    { $match: { promoId } },
    {
      $group: {
        _id: "$promoId",
        totalUses: { $sum: 1 },
        totalBonusGiven: { $sum: "$bonusAmount" },
        totalDiscountGiven: { $sum: "$discountAmount" },
        uniqueUsers: { $addToSet: "$userId" },
        averageBonusPerUse: { $avg: "$bonusAmount" },
      },
    },
  ]);

  if (stats.length === 0) {
    return {
      totalUses: 0,
      totalBonusGiven: 0,
      totalDiscountGiven: 0,
      uniqueUsers: 0,
      averageBonusPerUse: 0,
    };
  }

  return {
    ...stats[0],
    uniqueUsers: stats[0].uniqueUsers.length,
  };
};

export default mongoose.model("PromoUsage", PromoUsageSchema);