import * as WebBrowser from "expo-web-browser";

import { ApiError, fetchAPI } from "@/lib/fetch";
import type { ServiceId } from "@/constants/services";
import type { Ride } from "@/types/type";

// The rider's request flow, used by the confirm-ride screen. This is the card
// (Areeba hosted checkout -> server verify -> consume order -> create ride)
// and cash (create ride directly) paths, now unified behind one entry point so
// the screen doesn't re-implement the gateway dance.
//
// The ride is always created with status='requested' and driver_id=null; the
// server's auto-match engine assigns a driver asynchronously. Returns the
// created ride so the caller can navigate to the status screen.

export type RequestInput = {
  method: "cash" | "card";
  service: ServiceId;
  user: { name: string; email: string };
  // Location snapshot at request time.
  origin: { address: string; latitude: number; longitude: number };
  destination: { address: string; latitude: number; longitude: number };
  rideTimeSeconds: number;
  fareCents: number;
};

export type RequestResult = { ride: Ride };

const recordRide = async (
  input: RequestInput,
  method: "cash" | "card",
  orderId?: string,
): Promise<Ride> => {
  const res = await fetchAPI("/(api)/ride/create", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      origin_address: input.origin.address,
      destination_address: input.destination.address,
      origin_latitude: input.origin.latitude,
      origin_longitude: input.origin.longitude,
      destination_latitude: input.destination.latitude,
      destination_longitude: input.destination.longitude,
      ride_time: Math.round(input.rideTimeSeconds),
      fare_price: input.fareCents,
      payment_method: method,
      service: input.service,
      ...(orderId ? { payment_order_id: orderId } : {}),
    }),
  });
  return res.data as Ride;
};

export const requestRide = async (input: RequestInput): Promise<RequestResult> => {
  if (input.method === "cash") {
    const ride = await recordRide(input, "cash");
    return { ride };
  }

  // Card: create an Areeba checkout session on our server.
  const { orderId, checkoutUrl, error } = await fetchAPI(
    "/(api)/(areeba)/create",
    {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        name: input.user.name || input.user.email,
        email: input.user.email,
        fare_cents: input.fareCents,
        origin_address: input.origin.address,
        destination_address: input.destination.address,
        origin_latitude: input.origin.latitude,
        origin_longitude: input.origin.longitude,
        destination_latitude: input.destination.latitude,
        destination_longitude: input.destination.longitude,
        ride_time: Math.round(input.rideTimeSeconds),
      }),
    },
  );
  if (error || !checkoutUrl) throw new Error(error || "No checkout URL");

  // Open Areeba's hosted payment page. After payment the gateway redirects
  // back to the app (waseel://book-ride).
  const browserResult = await WebBrowser.openAuthSessionAsync(
    checkoutUrl,
    "waseel://book-ride",
  );

  let resultIndicator: string | undefined;
  if (browserResult.type === "success" && browserResult.url) {
    resultIndicator = new URL(browserResult.url).searchParams.get(
      "resultIndicator",
    ) ?? undefined;
  }

  // Verify the payment server-side.
  const verification = await fetchAPI("/(api)/(areeba)/verify", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ orderId, resultIndicator }),
  });

  if (!verification.success) {
    throw new ApiError(
      400,
      "Your payment was cancelled or could not be verified. Please try again.",
    );
  }

  const ride = await recordRide(input, "card", orderId);
  return { ride };
};