src/app/layout.tsx

import type { Metadata } from "next"
import "./globals.css"
import { Suspense } from "react"
import { Inter, Playfair_Display, JetBrains_Mono } from "next/font/google"
import { ThemeProvider } from "@/components/providers/theme-provider"
import { AuthProvider } from "@/components/providers/auth-provider"
import { ServiceWorkerRegistration } from "@/components/providers/service-worker"
import { OllamaProvider } from "@/contexts/ollama-context"
import { Header } from "@/components/layout/header"
import { Footer } from "@/components/layout/footer"
import { KeyboardShortcuts } from "@/components/layout/keyboard-shortcuts"
import { OnboardingTour } from "@/components/onboarding/onboarding-tour"
import { generateWebsiteSchema, generateOrganizationSchema, generateSoftwareApplicationSchema } from "@/lib/seo"

// Validate environment on import (dev only)
import "@/lib/env"

const inter = Inter({
  subsets: ["latin"],
  variable: "--font-inter",
  display: "swap",
})

const playfair = Playfair_Display({
  subsets: ["latin"],
  variable: "--font-playfair",
  display: "swap",
})

const jetbrainsMono = JetBrains_Mono({
  subsets: ["latin"],
  variable: "--font-jetbrains",
  display: "swap",
})

const BASE_URL = process.env.NEXT_PUBLIC_APP_URL || 'https://open-prompt.netlify.app'

export const metadata: Metadata = {
  metadataBase: new URL(BASE_URL),
  title: {
    default: "OpenPrompt | The GitHub for AI Prompts",
    template: "%s | OpenPrompt",
  },
  description: "Transform AI prompts into shareable micro-apps. Create, remix, and run prompts with zero friction. 177+ AI tools, multi-model support, and browser extension.",
  keywords: [
    "AI prompts",
    "prompt engineering",
    "ChatGPT prompts",
    "Claude prompts",
    "Gemini prompts",
    "AI tools",
    "prompt marketplace",
    "micro-apps",
    "GPT-4",
    "prompt optimizer",
    "AI writing tools",
    "prompt templates",
    "Midjourney prompts",
    "DALL-E prompts",
    "Stable Diffusion prompts",
  ],
  authors: [{ name: "Anky9972", url: "https://github.com/Anky9972" }],
  creator: "OpenPrompt",
  publisher: "OpenPrompt",
  robots: {
    index: true,
    follow: true,
    googleBot: {
      index: true,
      follow: true,
      "max-video-preview": -1,
      "max-image-preview": "large",
      "max-snippet": -1,
    },
  },
  openGraph: {
    title: "OpenPrompt | The GitHub for AI Prompts",
    description: "Transform AI prompts into shareable micro-apps. 177+ AI tools, multi-model support, and browser extension.",
    url: BASE_URL,
    siteName: "OpenPrompt",
    images: [
      {
        url: `${BASE_URL}/api/og?title=OpenPrompt&description=The+GitHub+for+AI+Prompts`,
        width: 1200,
        height: 630,
        alt: "OpenPrompt - The GitHub for AI Prompts",
      },
    ],
    locale: "en_US",
    type: "website",
  },
  twitter: {
    card: "summary_large_image",
    title: "OpenPrompt | The GitHub for AI Prompts",
    description: "Transform AI prompts into shareable micro-apps. 177+ AI tools, multi-model support.",
    creator: "@anky_vivek",
    site: "@openprompt",
    images: [`${BASE_URL}/api/og?title=OpenPrompt&description=The+GitHub+for+AI+Prompts`],
  },
  icons: {
    icon: [
      { url: "/logos/logo.svg", type: "image/svg+xml" },
      { url: "/favicon.ico", sizes: "32x32" },
    ],
    shortcut: "/logos/logo.svg",
    apple: [
      { url: "/logos/icon.png", sizes: "180x180" },
    ],
    other: [
      {
        rel: "apple-touch-icon-precomposed",
        url: "/logos/icon.png",
      },
      {
        rel: "mask-icon",
        url: "/logos/logo.svg",
        color: "#6366f1",
      },
    ],
  },
  manifest: "/manifest.json",
  alternates: {
    canonical: BASE_URL,
  },
  verification: {
    google: "google60f35921954050fd",
  },
  category: "technology",
  classification: "AI Tools, Productivity, Developer Tools",
}

export default function RootLayout({
  children,
}: Readonly<{
  children: React.ReactNode
}>) {
  const websiteSchema = generateWebsiteSchema()
  const organizationSchema = generateOrganizationSchema()
  const softwareSchema = generateSoftwareApplicationSchema()

  return (
    <html lang="en" className={`${inter.variable} ${playfair.variable} ${jetbrainsMono.variable}`} suppressHydrationWarning>
      <head>
        {/* JSON-LD Structured Data */}
        <script
          type="application/ld+json"
          dangerouslySetInnerHTML={{ __html: JSON.stringify(websiteSchema) }}
        />
        <script
          type="application/ld+json"
          dangerouslySetInnerHTML={{ __html: JSON.stringify(organizationSchema) }}
        />
        <script
          type="application/ld+json"
          dangerouslySetInnerHTML={{ __html: JSON.stringify(softwareSchema) }}
        />
        {/* Preconnect to external services for faster loading */}
        <link rel="preconnect" href="https://fonts.googleapis.com" />
        <link rel="preconnect" href="https://fonts.gstatic.com" crossOrigin="anonymous" />
        {/* DNS prefetch for AI API endpoints */}
        <link rel="dns-prefetch" href="https://api.openai.com" />
        <link rel="dns-prefetch" href="https://api.anthropic.com" />
        <link rel="dns-prefetch" href="https://generativelanguage.googleapis.com" />
      </head>
      <body className="min-h-screen bg-background antialiased" suppressHydrationWarning>
        <AuthProvider>
          <ThemeProvider
            attribute="class"
            defaultTheme="dark"
            enableSystem
            disableTransitionOnChange
          >
            <OllamaProvider>
              <Suspense fallback={
                <div className="relative flex min-h-screen flex-col">
                  <div className="h-16 border-b border-border" />
                  <main className="flex-1 flex items-center justify-center">
                    <div className="h-8 w-8 border-4 border-primary border-t-transparent rounded-full animate-spin" />
                  </main>
                </div>
              }>
                <div className="relative flex min-h-screen flex-col">
                  <Header />
                  <main className="flex-1">{children}</main>
                  <Footer />
                  <KeyboardShortcuts />
                  <OnboardingTour />
                </div>
              </Suspense>
              {/* PWA Service Worker Registration */}
              <ServiceWorkerRegistration />
            </OllamaProvider>
          </ThemeProvider>
        </AuthProvider>
      </body>
    </html>
  )
}