"use client";

import { GenerativeUIRender, type GenerativeUISpec } from "@assistant-ui/react";
import {
  UnknownComponentFallback,
  componentsAllowlist,
} from "@/components/gui";
import { ExampleNav } from "@/components/example-nav";

/**
 * Self-contained demo of the GenerativeUI primitive.
 *
 * Renders a hand-written `GenerativeUISpec` directly via `GenerativeUIRender`,
 * the same renderer that backs `MessagePrimitive.GenerativeUI` when a
 * `generative-ui` part flows through `MessagePrimitive.Parts`.
 *
 * In a real integration the spec arrives as a `generative-ui` message part
 * from the agent; the consumer-provided allowlist is the security boundary.
 */
const exampleSpec: GenerativeUISpec = {
  root: [
    {
      component: "Card",
      props: {
        title: "Welcome",
        description: "An agent-described card with a primary CTA.",
      },
      children: [
        {
          component: "Stack",
          props: { gap: "sm" },
          children: [
            {
              component: "Text",
              children: [
                "This card was rendered from a JSON spec emitted by the agent.",
              ],
            },
            {
              component: "Button",
              props: {
                label: "Get started",
                variant: "primary",
                onClickPrompt: "open onboarding",
              },
            },
          ],
        },
      ],
    },
    {
      component: "Card",
      props: { title: "Stats" },
      children: [
        {
          component: "Stack",
          props: { direction: "row", gap: "md" },
          children: [
            { component: "Stat", props: { label: "Revenue", value: "$124k" } },
            {
              component: "Stat",
              props: { label: "Active Users", value: "8.2k" },
            },
            { component: "Stat", props: { label: "Latency", value: "42ms" } },
          ],
        },
      ],
    },
  ],
};

export default function GenerativeUIPrimitivePage() {
  return (
    <div className="flex h-full flex-col">
      <ExampleNav />
      <main className="mx-auto flex h-full max-w-2xl flex-col gap-6 overflow-y-auto p-8">
        <header>
          <h1 className="text-2xl font-bold">MessagePrimitive.GenerativeUI</h1>
          <p className="text-muted-foreground mt-1 text-sm">
            Agent-described React UI rendered from a JSON spec via a
            consumer-provided component allowlist.
          </p>
        </header>

        <section className="flex flex-col gap-4">
          <GenerativeUIRender
            spec={exampleSpec}
            components={componentsAllowlist}
            Fallback={UnknownComponentFallback}
          />
        </section>
      </main>
    </div>
  );
}