All files / src/app/api/admin/referrals/codes route.ts

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export const dynamic = "force-dynamic";

import { NextRequest, NextResponse } from 'next/server';
import { Session } from "next-auth";
import { prisma } from "@/lib/prisma";
import { z } from "zod";
import { randomBytes } from "crypto";
import {
  withAdmin,
  withErrorHandling,
  successResponse,
  createdResponse,
  ApiError,
  ApiSuccessResponse,
  ApiErrorResponse } from "@/lib/api";
import { RouteContext } from "@/lib/api/middleware";

const GenerateCodesSchema = z.object({
  programId: z.number(),
  userId: z.number().optional(),
  count: z.number().int().min(1).max(100).default(1),
  prefix: z.string().optional()});

function generateReferralCode(prefix?: string): string {
  const code = randomBytes(4).toString("hex").toUpperCase();
  return prefix ? `${prefix}-${code}` : code;
}

/**
 * GET /api/admin/referrals/codes
 * List all referral codes with filters
 */
async function handleGet(request: NextRequest): Promise<NextResponse<ApiSuccessResponse<unknown> | ApiErrorResponse>> {
  const { searchParams } = new URL(request.url);
  const page = parseInt(searchParams.get("page") || "1");
  const limit = parseInt(searchParams.get("limit") || "20");
  const status = searchParams.get("status");
  const userId = searchParams.get("userId");
  const campaignId = searchParams.get("campaignId");

  const skip = (page - 1) * limit;

  // Build where clause
  const where: {
    status?: string;
    referrerId?: number;
    programId?: number;
  } = {};

  if (status) {
    where.status = status;
  }

  if (userId) {
    where.referrerId = parseInt(userId);
  }

  if (campaignId) {
    where.programId = parseInt(campaignId);
  }

  const [codes, total] = await Promise.all([
    prisma.referral.findMany({
      where,
      skip,
      take: limit,
      include: {
        program: {
          select: { id: true, name: true }}},
      orderBy: { createdAt: "desc" }}),
    prisma.referral.count({ where }),
  ]);

  // Get referrer info
  const referrerIds = [...new Set(codes.map((c) => c.referrerId))];
  const referrers = await prisma.user.findMany({
    where: { id: { in: referrerIds } },
    select: { id: true, email: true, name: true }});
  const referrerMap = new Map(referrers.map((r) => [r.id, r]));

  const formattedCodes = codes.map((code) => {
    const referrer = referrerMap.get(code.referrerId);
    return {
      id: code.id,
      code: code.referralCode,
      referrerId: code.referrerId,
      referrer: referrer
        ? {
            id: referrer.id,
            email: referrer.email,
            name: referrer.name || "N/A"}
        : null,
      programId: code.programId,
      program: code.program,
      status: code.status,
      refereeId: code.refereeId,
      referrerRewarded: code.referrerRewarded,
      refereeRewarded: code.refereeRewarded,
      createdAt: code.createdAt};
  });

  return successResponse({
    codes: formattedCodes,
    pagination: {
      page,
      limit,
      total,
      totalPages: Math.ceil(total / limit)}});
}

/**
 * POST /api/admin/referrals/codes
 * Generate referral codes (single or bulk)
 */
async function handlePost(request: NextRequest,
  _context: RouteContext | undefined,
  session: Session): Promise<NextResponse<ApiSuccessResponse<unknown> | ApiErrorResponse>> {
  const body = await request.json();
  const result = GenerateCodesSchema.safeParse(body);

  if (!result.success) {
    throw ApiError.validation("Invalid data", result.error.issues);
  }

  const validatedData = result.data;

  // Verify program exists
  const program = await prisma.referralProgram.findUnique({
    where: { id: validatedData.programId }});

  if (!program) {
    throw ApiError.notFound("Program");
  }

  // Verify user exists if provided
  if (validatedData.userId) {
    const user = await prisma.user.findUnique({
      where: { id: validatedData.userId }});
    if (!user) {
      throw ApiError.notFound("User");
    }
  }

  // Generate codes
  const codes = [];
  for (let i = 0; i < validatedData.count; i++) {
    let code = generateReferralCode(validatedData.prefix);

    // Ensure unique code
    let exists = await prisma.referral.findUnique({
      where: { referralCode: code }});
    while (exists) {
      code = generateReferralCode(validatedData.prefix);
      exists = await prisma.referral.findUnique({
        where: { referralCode: code }});
    }

    const referral = await prisma.referral.create({
      data: {
        programId: validatedData.programId,
        referrerId: validatedData.userId || session.user.id,
        referralCode: code,
        status: "pending"}});
    codes.push(referral);
  }

  return createdResponse({
    codes,
    message: `Generated ${codes.length} referral code(s)`});
}

export const GET = withErrorHandling(withAdmin(handleGet));
export const POST = withErrorHandling(withAdmin(handlePost));