import { Router } from "express";
import { z } from "zod";
import { authorize, requireAuth } from "../middleware/auth";
import {
  createInvoicePaymentLink,
  handleManualInvoicePayment,
  processFlutterwaveWebhook,
  processPaystackWebhook,
  verifyFlutterwaveSignature,
  verifyPaystackSignature
} from "../services/payment.service";

const router = Router();

const createLinkSchema = z.object({
  provider: z.enum(["paystack", "flutterwave", "manual"]).optional()
});

router.post("/invoices/:id/link", requireAuth, authorize("billing:manage"), async (req, res, next) => {
  try {
    const payload = createLinkSchema.parse(req.body ?? {});
    const result = await createInvoicePaymentLink(req.params.id, payload.provider);
    res.json(result);
  } catch (error) {
    next(error);
  }
});

const manualSchema = z.object({
  payment_reference: z.string().min(2)
});

router.post("/invoices/:id/manual-pay", requireAuth, authorize("billing:manage"), async (req, res, next) => {
  try {
    const payload = manualSchema.parse(req.body ?? {});
    const invoice = await handleManualInvoicePayment(req.params.id, payload.payment_reference, req.user?.email ?? "manual@system");
    res.json(invoice);
  } catch (error) {
    next(error);
  }
});

router.post("/webhooks/paystack", async (req, res, next) => {
  try {
    const signature = req.header("x-paystack-signature");
    const valid = await verifyPaystackSignature(signature, req.rawBody);
    if (!valid) {
      return res.status(401).json({ error: { code: "INVALID_SIGNATURE", message: "Invalid signature" } });
    }
    const result = await processPaystackWebhook(req.body);
    return res.json(result);
  } catch (error) {
    return next(error);
  }
});

router.post("/webhooks/flutterwave", async (req, res, next) => {
  try {
    const signature = req.header("verif-hash");
    const valid = await verifyFlutterwaveSignature(signature);
    if (!valid) {
      return res.status(401).json({ error: { code: "INVALID_SIGNATURE", message: "Invalid signature" } });
    }
    const result = await processFlutterwaveWebhook(req.body);
    return res.json(result);
  } catch (error) {
    return next(error);
  }
});

export default router;