import { NextResponse } from "next/server";
import { createBtcPayInvoice, isBtcPayConfigured } from "@/lib/btcpay";
import { registerInvoice } from "@/lib/serverLedger";

export async function POST(req: Request) {
  if (!isBtcPayConfigured()) {
    return NextResponse.json(
      { ok: false, error: "BTCPay not configured — set BTCPAY_URL, BTCPAY_API_KEY, BTCPAY_STORE_ID in .env.local" },
      { status: 503 },
    );
  }

  let body: unknown;
  try { body = await req.json(); } catch {
    return NextResponse.json({ ok: false, error: "Invalid JSON" }, { status: 400 });
  }

  const { usdAmount, handle } = (body as Record<string, unknown>) ?? {};

  if (typeof usdAmount !== "number" || usdAmount <= 0 || !Number.isFinite(usdAmount)) {
    return NextResponse.json({ ok: false, error: "usdAmount must be a positive number" }, { status: 400 });
  }
  if (typeof handle !== "string" || !handle.trim()) {
    return NextResponse.json({ ok: false, error: "handle is required" }, { status: 400 });
  }
  if (usdAmount < 0.5) {
    return NextResponse.json({ ok: false, error: "Minimum deposit is $0.50" }, { status: 400 });
  }
  if (usdAmount > 50000) {
    return NextResponse.json({ ok: false, error: "Maximum single deposit is $50,000" }, { status: 400 });
  }

  const result = await createBtcPayInvoice(usdAmount, handle.trim());
  if (!result.ok) {
    return NextResponse.json({ ok: false, error: result.error }, { status: 502 });
  }

  // Register invoice → handle mapping in server ledger so webhook/claim can credit the right account
  try {
    registerInvoice(result.invoice.id, handle.trim());
  } catch {
    // Non-fatal — client can still poll and claim manually
  }

  return NextResponse.json({
    ok: true,
    invoiceId: result.invoice.id,
    checkoutLink: result.invoice.checkoutLink,
    status: result.invoice.status,
    expiresAt: result.invoice.expirationTime,
  });
}