import path from 'path';
import * as Log from '../build/output/log';
import { promises as fs } from 'fs';
import { bold } from './picocolors';
import { APP_DIR_ALIAS } from './constants';
const globOrig = require('next/dist/compiled/glob');
const glob = (cwd, pattern)=>{
    return new Promise((resolve, reject)=>{
        globOrig(pattern, {
            cwd
        }, (err, files)=>{
            if (err) {
                return reject(err);
            }
            resolve(files);
        });
    });
};
function getRootLayout(isTs) {
    if (isTs) {
        return `export const metadata = {
  title: 'Next.js',
  description: 'Generated by Next.js',
}

export default function RootLayout({
  children,
}: {
  children: React.ReactNode
}) {
  return (
    <html lang="en">
      <body>{children}</body>
    </html>
  )
}
`;
    }
    return `export const metadata = {
  title: 'Next.js',
  description: 'Generated by Next.js',
}

export default function RootLayout({ children }) {
  return (
    <html lang="en">
      <body>{children}</body>
    </html>
  )
}
`;
}
export async function verifyRootLayout({ dir, appDir, tsconfigPath, pagePath, pageExtensions }) {
    let rootLayoutPath;
    try {
        const layoutFiles = await glob(appDir, `**/layout.{${pageExtensions.join(',')}}`);
        const isFileUnderAppDir = pagePath.startsWith(`${APP_DIR_ALIAS}/`);
        const normalizedPagePath = pagePath.replace(`${APP_DIR_ALIAS}/`, '');
        const pagePathSegments = normalizedPagePath.split('/');
        // Find an available dir to place the layout file in, the layout file can't affect any other layout.
        // Place the layout as close to app/ as possible.
        let availableDir;
        if (isFileUnderAppDir) {
            if (layoutFiles.length === 0) {
                // If there's no other layout file we can place the layout file in the app dir.
                // However, if the page is within a route group directly under app (e.g. app/(routegroup)/page.js)
                // prefer creating the root layout in that route group.
                const firstSegmentValue = pagePathSegments[0];
                availableDir = firstSegmentValue.startsWith('(') ? firstSegmentValue : '';
            } else {
                pagePathSegments.pop() // remove the page from segments
                ;
                let currentSegments = [];
                for (const segment of pagePathSegments){
                    currentSegments.push(segment);
                    // Find the dir closest to app/ where a layout can be created without affecting other layouts.
                    if (!layoutFiles.some((file)=>file.startsWith(currentSegments.join('/')))) {
                        availableDir = currentSegments.join('/');
                        break;
                    }
                }
            }
        } else {
            availableDir = '';
        }
        if (typeof availableDir === 'string') {
            const tsConfigFileName = tsconfigPath || 'tsconfig.json';
            const resolvedTsConfigPath = path.join(dir, tsConfigFileName);
            const hasTsConfig = await fs.access(resolvedTsConfigPath).then(()=>true, ()=>false);
            rootLayoutPath = path.join(appDir, availableDir, `layout.${hasTsConfig ? 'tsx' : 'js'}`);
            await fs.writeFile(rootLayoutPath, getRootLayout(hasTsConfig));
            Log.warn(`Your page ${bold(`app/${normalizedPagePath}`)} did not have a root layout. We created ${bold(`app${rootLayoutPath.replace(appDir, '')}`)} for you.`);
            // Created root layout
            return [
                true,
                rootLayoutPath
            ];
        }
    } catch (e) {
        console.error(e);
    }
    // Didn't create root layout
    return [
        false,
        rootLayoutPath
    ];
}

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