import fs from "fs";
import path from "path";
import * as Log from "../build/output/log";
export const existsSync = (f)=>{
    try {
        fs.accessSync(f, fs.constants.F_OK);
        return true;
    } catch (_) {
        return false;
    }
};
export function findDir(dir, name) {
    // prioritize ./${name} over ./src/${name}
    let curDir = path.join(dir, name);
    if (existsSync(curDir)) return curDir;
    curDir = path.join(dir, "src", name);
    if (existsSync(curDir)) return curDir;
    return null;
}
export function findPagesDir(dir, isAppDirEnabled) {
    const pagesDir = findDir(dir, "pages") || undefined;
    const appDir = findDir(dir, "app") || undefined;
    if (isAppDirEnabled && appDir == null && pagesDir == null) {
        throw new Error("> Couldn't find any `pages` or `app` directory. Please create one under the project root");
    }
    if (!isAppDirEnabled) {
        if (appDir != null && pagesDir == null) {
            throw new Error("> The `app` directory is experimental. To enable, add `appDir: true` to your `next.config.js` configuration under `experimental`. See https://nextjs.org/docs/messages/experimental-app-dir-config");
        }
        if (appDir != null && pagesDir != null) {
            Log.warn("The `app` directory is experimental. To enable, add `appDir: true` to your `next.config.js` configuration under `experimental`. See https://nextjs.org/docs/messages/experimental-app-dir-config");
        }
        if (pagesDir == null) {
            throw new Error("> Couldn't find a `pages` directory. Please create one under the project root");
        }
    }
    return {
        pagesDir,
        appDir: isAppDirEnabled ? appDir : undefined
    };
}

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