import { NextRequest, NextResponse } from "next/server";
import { adminResetUserCredits } from "@/lib/billing";
import { prisma } from "@/lib/db";

/**
 * Admin utility: reset / adjust a user's credits.
 * Authorization: Bearer ${ADMIN_API_KEY}
 *
 * Body: { userId | email, plan?, monthlyCredits?, creditsUsed?, extraCredits?, clearFreeTopUp? }
 */
export async function POST(req: NextRequest) {
  const adminKey = process.env.ADMIN_API_KEY;
  if (!adminKey) {
    return NextResponse.json({ error: "Admin API not configured" }, { status: 503 });
  }

  const auth = req.headers.get("authorization");
  if (auth !== `Bearer ${adminKey}`) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  let body: {
    userId?: string;
    email?: string;
    plan?: "FREE" | "PREMIUM";
    monthlyCredits?: number;
    creditsUsed?: number;
    extraCredits?: number;
    clearFreeTopUp?: boolean;
  };
  try {
    body = await req.json();
  } catch {
    return NextResponse.json({ error: "Invalid JSON" }, { status: 400 });
  }

  let userId = body.userId;
  if (!userId && body.email) {
    const found = await prisma.user.findUnique({ where: { email: body.email } });
    if (!found) {
      return NextResponse.json({ error: "User not found" }, { status: 404 });
    }
    userId = found.id;
  }
  if (!userId) {
    return NextResponse.json({ error: "Provide userId or email" }, { status: 400 });
  }

  const updated = await adminResetUserCredits(userId, {
    plan: body.plan,
    monthlyCredits: body.monthlyCredits,
    creditsUsed: body.creditsUsed,
    extraCredits: body.extraCredits,
    clearFreeTopUp: body.clearFreeTopUp,
  });

  return NextResponse.json({
    ok: true,
    user: {
      id: updated.id,
      email: updated.email,
      plan: updated.plan,
      monthlyCredits: updated.monthlyCredits,
      creditsUsed: updated.videosUsed,
      extraCredits: updated.extraCredits,
      freeTopUpPurchased: updated.freeTopUpPurchased,
    },
  });
}