import { verifyPayTRCallback } from "@/lib/payments/paytr";
import { activatePlanInDb } from "@/lib/appwrite/subscription-actions";
import type { TenantPlan, PlanPeriod } from "@/lib/appwrite/schema";

export async function POST(req: Request): Promise<Response> {
  const rawBody = await req.text();
  const params = new URLSearchParams(rawBody);

  const merchantOid = params.get("merchant_oid") ?? "";
  const status = params.get("status") ?? "";
  const totalAmount = params.get("total_amount") ?? "";
  const hash = params.get("hash") ?? "";

  if (!verifyPayTRCallback({ merchantOid, status, totalAmount, hash })) {
    return new Response("FAILED", { status: 400 });
  }

  if (status === "success") {
    // merchant_oid: {encodedTenantId}T{timestamp}{random}P{plan}X{period}
    // Hyphens were encoded as Z — decode back
    const tenantId = (merchantOid.split("T")[0] ?? "").replace(/Z/g, "-");
    const planPart = merchantOid.split("P")[1]; // "{plan}X{period}"
    const plan = (planPart?.split("X")[0] ?? "pro") as TenantPlan;
    const period = (planPart?.split("X")[1] ?? "monthly") as PlanPeriod;

    if (!tenantId) {
      return new Response("FAILED", { status: 400 });
    }
    try {
      // totalAmount kuruş cinsinden gelir → TRY'ye çevir
      const amountTRY = Math.round(Number(totalAmount) / 100);
      const orderId = merchantOid;
      await activatePlanInDb(tenantId, plan, "paytr", period, { amount: amountTRY, orderId });
    } catch (e) {
      console.error("[paytr-callback]", e);
      return new Response("FAILED", { status: 500 });
    }
  }

  // PayTR düz metin "OK" bekliyor — BOM veya whitespace olmayacak
  return new Response("OK", {
    status: 200,
    headers: { "Content-Type": "text/plain" },
  });
}