import { NextResponse } from "next/server";
import { stripeClient } from "../../../../lib/stripeClient";

export async function POST(req: Request) {
  try {
    const body = await req.json();
    const accountId = body.accountId as string;
    const name = body.name as string;
    const description = body.description as string;
    const unitAmount = Number(body.unitAmount);
    const currency = (body.currency as string) || "usd";
    const quantity = Number(body.quantity) || 1;

    if (!accountId || !name || !Number.isFinite(unitAmount)) {
      return NextResponse.json(
        { error: "accountId, name, and unitAmount are required." },
        { status: 400 }
      );
    }

    const baseUrl = process.env.NEXT_PUBLIC_BASE_URL;
    if (!baseUrl) {
      return NextResponse.json(
        {
          error:
            "Missing NEXT_PUBLIC_BASE_URL. Set it so we can build success/cancel URLs.",
        },
        { status: 500 }
      );
    }

    // Direct charge to the connected account with an application fee.
    const session = await stripeClient.checkout.sessions.create(
      {
        line_items: [
          {
            price_data: {
              currency,
              product_data: { name, description },
              unit_amount: unitAmount,
            },
            quantity,
          },
        ],
        payment_intent_data: {
          // Sample application fee. Adjust this based on your pricing model.
          application_fee_amount: Math.max(50, Math.floor(unitAmount * 0.1)),
        },
        mode: "payment",
        success_url: `${baseUrl}/success?session_id={CHECKOUT_SESSION_ID}`,
        cancel_url: `${baseUrl}/cancel`,
      },
      {
        stripeAccount: accountId,
      }
    );

    return NextResponse.json({ url: session.url });
  } catch (err: any) {
    return NextResponse.json(
      { error: err?.message || "Failed to create checkout session." },
      { status: 500 }
    );
  }
}