WRNexusJS/packages/cli/src/ai-guide.ts

/**
 * Framework conventions shipped into scaffolded apps as CLAUDE.md and public/llms.txt so
 * AI coding tools (Claude Code, Cursor, Copilot) generate correct WrNexus code.
 * Generated from the repo-root llms.txt - do not edit by hand.
 */

/** The canonical WrNexus conventions reference (served as /llms.txt). */
export const AI_GUIDE = `# WrNexus

> WrNexus is an SSR-first, **Bun-native** full-stack web framework. UI is written in
> \`.wrn\` files (its own component language — NOT React/JSX/Vue). Routing is file-based.
> This document teaches an AI how to write correct WrNexus code. It is private and
> post-dates model training data, so rely on THIS document, not prior web-framework
> assumptions.

## Golden rules

- **Pages, components, and layouts are \`.wrn\` files.** Do NOT write \`.tsx\`/\`.jsx\`/React
  for UI. Do NOT use \`useState\`, hooks, JSX, or a client bundler.
- **Routing is file-based** under \`app/\`. The filename is the route. No router config.
- **Interactivity** lives in \`state\` + \`{expr}\` + \`@event\` inside \`.wrn\`. Components render
  on the server and hydrate automatically — you never write client-side JS islands.
- **Runtime is Bun only** (uses \`Bun.serve\`, \`bun:sqlite\`, \`Bun.password\`, …). Node is not supported.
- To add files, prefer the CLI: \`wrnexus generate page <Name>\` / \`component <name>\` / \`api <path>\` / \`schema <name>\`.

## Project layout

\`\`\`
app/
  pages/       *.wrn  → routes: index.wrn = "/", about.wrn = "/about", blog/[slug].wrn = "/blog/:slug"
  components/  *.wrn  → reusable UI, mounted in a page/component via <div data-component="name" ...props>
  layouts/     *.wrn  → named layouts; a page opts in with  layout = "name"
  api/         *.ts   → HTTP handlers: export const GET/POST/PUT/PATCH/DELETE = async (ctx) => Response
  middleware/  *.ts   → export default async (ctx, next) => next()
  realtime/    *.ts   → export default defineRoom({ ... }) from "@wrnexus/core"  (ws://host/realtime/<name>)
  schemas/     *.ts   → validation schemas (the \`v\` builder), used by forms + parseBody
  locales/     *.json → i18n messages per language
  db/          schema.ts, queries/*.sql, migrations/*.sql
  styles/      global.css  → Tailwind (default) or plain CSS
wrnexus.config.ts    → app config (AppConfig from "@wrnexus/styles")
public/              → static assets served at /
\`\`\`

## \`.wrn\` page

\`\`\`wrn
page Home {
  layout = "public"          // optional: a component in app/layouts/<name>.wrn ("none" to skip)

  state count = 0            // optional: seeds client-reactive state (omit for pure SSR)

  seo {
    title = "Home"
    description = "..."
    canonical = "/"
  }

  view {
    <h1>Hello</h1>
    <p>Count is {count}, doubled is {count * 2}.</p>
    <button @click="count++">Increment</button>
    <div data-component="counter" start="5" label="Clicks"></div>
  }

  style {
    h1 { color: var(--wrn-color-text); }
  }
}
\`\`\`

## \`.wrn\` component

\`\`\`wrn
component Counter {
  props {                    // props come from mount attributes; each is coerced to the
    start = 0                // TYPE of its default (so start="5" arrives as the number 5)
    label = "Count"
  }
  state count = start        // state may reference props
  view {
    <button @click="count++">{label}: {count}</button>
  }
}
\`\`\`

Mount it from any page/component: \`<div data-component="counter" start="0" label="Clicks"></div>\`.
Components render on the server with their props, then hydrate — no per-component JS.

## The \`view { }\` block (plain HTML + a few directives)

- \`{expr}\` — interpolate a JS expression. Reactive if it references \`state\`: \`{count}\`, \`{count * 2}\`, \`{user.name}\`.
- \`@event="expr"\` — bind a DOM event; the expression runs in the reactive scope: \`@click="count++"\`, \`@input="name = event.target.value"\`.
- \`<div data-component="name" prop="v">\` — mount a component (attrs become string props, coerced).
- \`<slot></slot>\` / \`<slot name="x"></slot>\` — component/layout slots; fill with \`<div data-slot="x">…</div>\`.
- **Server loop (DB/list/table):** \`{#each <list> as <item>[, <i>]} …rows… {:empty} …fallback… {/each}\` — iterates SSR data on the server and renders markup per item. \`{item.field}\` interpolates (HTML-escaped, XSS-safe). \`<list>\` is a JS expression, usually an \`ssr\` data binding (see "Data-driven tables" below). This is how you render a database table in \`.wrn\`.
- **Server conditional:** \`{#if <expr>} … {:else if <expr>} … {:else} … {/if}\` — renders the first truthy branch on the server. \`<expr>\` can reference \`ssr\` data, or the \`item\`/\`index\` of an enclosing \`{#each}\`. Works at page level and inside loops (e.g. \`{#if r.active}<span>●</span>{:else}<span>○</span>{/if}\` per row). For client-side show/hide based on reactive \`state\`, use \`data-show="expr"\` instead.
- i18n: \`{t:home.title}\` in text, \`t:placeholder="form.name"\` on attributes — resolved per request from \`app/locales/\`.
- Theme: any element with \`data-wrn-theme-toggle\` toggles light/dark; \`data-wrn-theme-set="dark"\` sets it.
- Void/self-closing tags are fine: \`<br />\`, \`<img src="..." />\`.
- Only \`{\` and \`}\` are special (interpolation). Don't use a bare \`}\` in view text.

## Data-driven tables / lists (server-rendered \`.wrn\`)

Use an \`ssr\` data binding to fetch rows on the server, then \`{#each}\` to render them.
This renders on the **server** (SSR-first) and is HTML-escaped by default.

\`\`\`wrn
page Admin {
  layout = "dashboard"

  // Fetch on the server. The api handler at /api/contacts returns { contacts: [...] };
  // this block's \`return contacts\` exposes that array (via \`$data\`) as the binding \`rows\`.
  ssr {
    api rows GET /api/contacts { return contacts }
  }

  view {
    <table>
      <tbody>
        {#each rows as r, i}
          <tr>
            <td>#{i}</td>
            <td>{r.name}</td>
            <td><a href="mailto:{r.email}">{r.email}</a></td>
          </tr>
        {:empty}
          <tr><td colspan="3">No submissions yet.</td></tr>
        {/each}
      </tbody>
    </table>
  }
}
\`\`\`

The matching API returns the array under a key the \`ssr\` block reads:

\`\`\`ts
// app/api/contacts.ts  → GET /api/contacts
import { getDb } from "@wrnexus/db";
export const GET = async () => {
  const contacts = await getDb().all("SELECT id, name, email FROM contacts ORDER BY id DESC");
  return Response.json({ contacts });   // ssr block does \`return contacts\`
};
\`\`\`

**Prefer this \`.wrn\` + \`{#each}\` approach for DB-backed tables and lists.** (\`.ts\`/\`.tsx\`
pages returning an HTML string are also supported for fully-custom programmatic rendering,
but a \`.wrn\` page with \`ssr\` data + \`{#each}\` is the idiomatic, SSR-first way.)

## API routes (\`app/api/*.ts\`)

\`\`\`ts
// app/api/users/list.ts  → GET /api/users/list
import { getDb } from "@wrnexus/db";

export const GET = async (ctx) => {
  return Response.json({ users: await ListUsers(getDb()) });
};

export const POST = async (ctx) => {
  const body = await ctx.req.json();
  return Response.json({ ok: true, body }, { status: 201 });
};
\`\`\`

\`ctx\` (the \`Context\` from \`@wrnexus/core\`) has:
\`req: Request\`, \`url: URL\`, \`params: Record<string,string>\` (dynamic route params, e.g. \`/users/[id]\` → \`ctx.params.id\`),
\`lang: string\`, \`t(key, params?)\` (i18n), \`cookies\` (get/set), \`session\` (get/set). Auth: \`getUser(ctx)\` after \`sessionAuth\`/\`logIn\`.

When an SSO forward-auth verifier needs the URL that originally reached the gateway, use
\`@wrnexus/helpers\` instead of constructing it from untrusted headers:

\`\`\`ts
import { redirectToLogin } from "@wrnexus/helpers";

return redirectToLogin(ctx, "/login", {
  allowedHosts: ["admin.localhost:3000", "reports.localhost:3000"],
});
\`\`\`

The package also exports \`getOriginalRequestUrl\`, \`getOriginalRequestOrigin\`,
\`getOriginalRequestPath\`, and \`getOriginalRequestMethod\`. Always pass \`allowedHosts\` when
using forwarded gateway URLs; the helper rejects untrusted redirect destinations.

## Middleware & realtime

\`\`\`ts
// app/middleware/logger.ts
export default async function logger(ctx, next) {
  console.log(ctx.req.method, ctx.url.pathname);
  return next();               // return a Response WITHOUT calling next() to short-circuit
}
\`\`\`

\`\`\`ts
// app/realtime/chat.ts  → ws://host/realtime/chat
import { defineRoom } from "@wrnexus/core";
export default defineRoom({
  onConnect(client) { client.send({ type: "system", text: "connected" }); },
  onMessage(client, msg) { client.room.broadcast({ type: "message", data: msg }); },
});
\`\`\`
Client side: a page opts in with \`data-room="chat"\` (handled by the realtime runtime).

## Config (\`wrnexus.config.ts\`)

\`\`\`ts
import type { AppConfig } from "@wrnexus/styles";
const config: AppConfig = {
  seo: { title: "App", titleTemplate: "%s | App", description: "..." },
  styles: { entry: "app/styles/global.css", process: async ({ entryPath, mode }) => /* Tailwind */ "" },
  fonts: { sans: '"Inter", system-ui, sans-serif', google: [{ family: "Inter", weights: [400, 600] }] },
  theme: { default: "dark", themes: { light: { "color-primary": "#2563eb" } } },
  i18n: { default: "en", locales: ["en", "es"] },
  db: { driver: "sqlite", url: "file:./dev.db" },
  security: { cors: { enabled: true, origin: ["http://localhost:5173"] } },
  // profiles: { production: { db: { driver: "postgres", url: process.env.DATABASE_URL } } },
};
export default config;
\`\`\`

## Database (\`@wrnexus/db\`)

\`\`\`ts
// app/db/schema.ts
import { v, table } from "@wrnexus/db";
export const users = table("users", {
  id: v.id(),
  name: v.string(),
  email: v.string().unique(),
  createdAt: v.timestamp(),
});
\`\`\`
- Queries: write \`app/db/queries/*.sql\` with \`-- name: ListUsers :many\` blocks; \`wrnexus db generate\` emits typed functions.
- Access at runtime: \`import { getDb } from "@wrnexus/db"; const rows = await ListUsers(getDb());\`
- Migrations in \`app/db/migrations/\`; run \`wrnexus db migrate\` (dev auto-migrates sqlite).

## Validation (\`@wrnexus/validation\`)

\`\`\`ts
// app/schemas/login.ts
import { v } from "@wrnexus/validation";
export default v.object({
  email: v.string().email(),
  password: v.string().min(8),
});
\`\`\`
In an API route: \`import s from "../schemas/login"; import { parseBody } from "@wrnexus/validation"; const r = await parseBody(s, ctx.req);\` → \`r.ok ? r.value : r.response\`.
In a form: \`<form data-schema="login" action="/api/login" method="post">\` + \`<span data-error="email"></span>\` (client + server validation connected automatically).

## AI / LLM (\`@wrnexus/ai\`)

\`\`\`ts
// app/api/ai.ts
import { createAI } from "@wrnexus/ai";
const ai = createAI();                     // reads ANTHROPIC_API_KEY; default model claude-opus-4-8
export const POST = async (ctx) => {
  const { prompt } = await ctx.req.json();
  return ai.streamResponse(prompt);        // or: return Response.json({ text: await ai.generate(prompt) })
};
\`\`\`

## CLI

\`\`\`
wrnexus dev .                 # dev server + HMR
wrnexus build .               # production build → dist/server.js
bun dist/server.js            # run the production server (or npm start)
wrnexus create <name>         # scaffold a new app
wrnexus update --latest       # deps + syntax/config migrations + verification
wrnexus generate page <Name>  # scaffold a page   (aliases: g p)
wrnexus generate component <name> | api <path> | schema <name>
wrnexus db migrate | rollback | status | new [--from-models] | generate | seed
wrnexus eject <component>     # copy a WrNexus UI component's .wrn into app/components to customize
\`\`\`

## When asked to "create a page/component/feature"

1. Create the \`.wrn\` file under \`app/pages/\` (or \`app/components/\`) with a \`page\`/\`component\` block — or run \`wrnexus generate page <Name>\`.
2. Put markup in \`view { }\`, interactive bits in \`state\` + \`{expr}\` + \`@event\`, reusable UI as components mounted via \`data-component\`.
3. For data, add an \`app/api/*.ts\` route and \`getDb()\`; for forms, add an \`app/schemas/*.ts\` and \`data-schema\`.
4. Style with Tailwind utility classes in the view, or theme tokens (\`var(--wrn-*)\`), or \`style { }\`.
5. Never emit React/JSX, a manual router, or client-side island JS — the framework handles hydration.\n`;

/** Agent-oriented instructions (shipped as CLAUDE.md): a preamble + the full guide. */
export const CLAUDE_MD =
  `# WrNexus app - instructions for AI coding assistants

This is a **WrNexus** app. When creating or editing pages, components, API routes,
or features, follow the framework conventions below. WrNexus is private and not in
your training data, so rely on these rules - do NOT assume React/Next.js/Vue patterns.
\n` + AI_GUIDE;