import { NextRequest, NextResponse } from "next/server";
import { prisma } from "@/lib/prisma";
import { requireAuth } from "@/lib/auth";

const TOP_UP_AMOUNTS = {
  500: { usd: 4.99 },
  1100: { usd: 9.99 },
  3000: { usd: 24.99 },
} as const;

export async function POST(req: NextRequest) {
  const jwtPayload = await requireAuth(req);
  if (!jwtPayload) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }

  try {
    const body = await req.json();
    const { amount } = body;

    if (!amount || !(amount in TOP_UP_AMOUNTS)) {
      return NextResponse.json(
        { error: "Invalid amount. Choose 500, 1100, or 3000 FLH." },
        { status: 400 }
      );
    }

    const pricing = TOP_UP_AMOUNTS[amount as keyof typeof TOP_UP_AMOUNTS];

    // In production, this would create a Polar.sh checkout session.
    // For development, we mock the flow by directly adding FLH balance.
    // Replace with actual Polar API integration when ready.
    const useMock = process.env.MOCK_PAYMENTS !== "false";

    if (useMock) {
      await prisma.user.update({
        where: { id: jwtPayload.userId },
        data: { flhBalance: { increment: amount } },
      });

      return NextResponse.json({
        success: true,
        url: "/wallet?topup=success",
        mock: true,
        amount,
        amountUsd: pricing.usd,
      });
    }

    // Production path — Polar checkout creation
    // const polarSession = await createPolarCheckout({
    //   amount,
    //   customerId: user.stripeCustomerId,
    //   metadata: { userId: jwtPayload.userId, type: "top-up", amount },
    // });

    return NextResponse.json({
      success: true,
      url: "/wallet?topup=success", // would be polarSession.url
      amount,
      amountUsd: pricing.usd,
    });
  } catch (error) {
    console.error("Top-up checkout error:", error);
    return NextResponse.json(
      { error: "Failed to create checkout" },
      { status: 500 }
    );
  }
}