"use client";

import { Loader2 } from "lucide-react";
import { useRouter } from "next/navigation";
import { useSession } from "next-auth/react";
import { useState } from "react";
import { cn } from "@/lib/utils";

export function PricingActionButton({
  planId,
  planName,
  checkoutEnabled,
  highlight,
}: {
  planId: string;
  planName: string;
  checkoutEnabled: boolean;
  highlight?: boolean;
}) {
  const { data: session, status } = useSession();
  const router = useRouter();
  const [isPending, setIsPending] = useState(false);

  async function handleCheckout() {
    if (isPending) {
      return;
    }

    if (status === "loading") {
      return;
    }

    if (!checkoutEnabled) {
      window.alert("支付尚未配置，请先在环境变量中配置 Stripe Price ID。");
      return;
    }

    if (!session?.user || session.user.type === "guest") {
      router.push("/login?callbackUrl=/lovart/pricing");
      return;
    }

    setIsPending(true);

    try {
      const response = await fetch("/api/billing/checkout", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({ planId }),
      });

      const data = (await response.json()) as { error?: string; url?: string };

      if (!response.ok || !data.url) {
        window.alert(data.error || "创建支付会话失败，请稍后再试。");
        return;
      }

      window.location.assign(data.url);
    } catch (error) {
      console.error("[PricingActionButton] checkout error", error);
      window.alert("创建支付会话失败，请稍后再试。");
    } finally {
      setIsPending(false);
    }
  }

  return (
    <button
      className={cn(
        "mt-6 inline-flex w-full items-center justify-center rounded-xl px-4 py-2 text-sm font-semibold",
        highlight
          ? "bg-white text-zinc-900 hover:bg-zinc-200"
          : "border border-white/20 text-zinc-100 hover:border-white/40",
        isPending && "cursor-not-allowed opacity-75"
      )}
      disabled={isPending}
      onClick={handleCheckout}
      type="button"
    >
      {isPending ? (
        <span className="inline-flex items-center gap-2">
          <Loader2 className="h-4 w-4 animate-spin" />
          跳转支付中...
        </span>
      ) : (
        `订阅 ${planName}`
      )}
    </button>
  );
}