"use strict";

const path = require("path");
const fs = require("fs");
const url = require("url");

// Make sure any symlinks in the project folder are resolved:
// https://github.com/facebook/create-react-app/issues/637
const appDirectory = fs.realpathSync(process.cwd());
const resolveApp = (relativePath) => path.resolve(appDirectory, relativePath);

const envPublicUrl = process.env.PUBLIC_URL;

function ensureSlash(inputPath, needsSlash) {
    const hasSlash = inputPath.endsWith("/");
    if (hasSlash && !needsSlash) {
        return inputPath.substr(0, inputPath.length - 1);
    } else if (!hasSlash && needsSlash) {
        return `${inputPath}/`;
    } else {
        return inputPath;
    }
}

const getPublicUrl = (appPackageJson) =>
    envPublicUrl || require(appPackageJson).homepage;

// We use `PUBLIC_URL` environment variable or "homepage" field to infer
// "public path" at which the app is served.
// Webpack needs to know it to put the right <script> hrefs into HTML even in
// single-page apps that may serve index.html for nested URLs like /todos/42.
// We can't use a relative path in HTML because we don't want to load something
// like /todos/42/static/js/bundle.7289d.js. We have to know the root.
function getServedPath(appPackageJson) {
    const publicUrl = getPublicUrl(appPackageJson);
    const servedUrl =
        envPublicUrl || (publicUrl ? url.parse(publicUrl).pathname : "/");
    return ensureSlash(servedUrl, true);
}

const moduleFileExtensions = [
    "web.mjs",
    "mjs",
    "web.js",
    "js",
    "web.ts",
    "ts",
    "web.tsx",
    "tsx",
    "json",
    "web.jsx",
    "jsx",
];

// Resolve file paths in the same order as webpack
const resolveModule = (resolveFn, filePath) => {
    const extension = moduleFileExtensions.find((extension) =>
        fs.existsSync(resolveFn(`${filePath}.${extension}`))
    );

    if (extension) {
        return resolveFn(`${filePath}.${extension}`);
    }

    return resolveFn(`${filePath}.js`);
};

// config after eject: we're in ./config/
module.exports = {
    dotenv: resolveApp(".env"),
    appPath: resolveApp("."),
    appBuild: resolveApp("build"),
    appPublic: resolveApp("public"),
    appHtml: resolveApp("public/index.html"),
    appIndexJs: resolveModule(resolveApp, "src/index"),
    appPackageJson: resolveApp("package.json"),
    appSrc: resolveApp("src"),
    appTsConfig: resolveApp("tsconfig.json"),
    appJsConfig: resolveApp("jsconfig.json"),
    yarnLockFile: resolveApp("yarn.lock"),
    testsSetup: resolveModule(resolveApp, "src/setupTests"),
    proxySetup: resolveApp("src/setupProxy.js"),
    appNodeModules: resolveApp("node_modules"),
    publicUrl: getPublicUrl(resolveApp("package.json")),
    servedPath: getServedPath(resolveApp("package.json")),
    i18nPath: resolveApp("public/locales"),
};

module.exports.moduleFileExtensions = moduleFileExtensions;
