import { existsSync } from "fs";
import { resolve, join } from "path";

export const rootPath = resolve(process.cwd());

declare const __webpack_require__;
declare const __non_webpack_require__;
export const requireFx =
  typeof __webpack_require__ === "function" ? __non_webpack_require__ : require;

export const getPaths = (userPaths = {}) => ({
  src: join(rootPath, "./src"),
  entry: {
    main: join(rootPath, "./src/index")
  },
  outputFolder: join(rootPath, "./dist"),
  ...userPaths
});

export const resolveHtmlTemplate = () => {
  const srcHtmlPath = resolve(rootPath, "./src/index.html");
  const assetsHtmlPath = resolve(rootPath, "./assets/index.html");
  const rootHtmlPath = resolve(rootPath, "./index.html");
  if (existsSync(srcHtmlPath)) {
    return srcHtmlPath;
  }
  if (existsSync(assetsHtmlPath)) {
    return assetsHtmlPath;
  }
  if (existsSync(rootHtmlPath)) {
    return rootHtmlPath;
  }
};

export const makeDevEntry = (entry, port) => {
  return [
    require.resolve("webpack-dev-server/client") + `?http://localhost:${port}`,
    require.resolve("webpack/hot/dev-server"),
    entry
  ];
};

export const makeDevEntries = (entries, port) => {
  Object.keys(entries).forEach(entryKey => {
    const entry = entries[entryKey];
    entries[entryKey] = makeDevEntry(entry, port);
  });
  return entries;
};

export const isBackEndConfig = mode => mode === "node";

export const resolveLocal = (...args) => {
  return join(__dirname, "../../", ...args);
};

export const resolveContext = (context, path) => {
  return resolve(context, path);
};

export const getFile = relativePath => {
  const filepath = join(rootPath, relativePath);
  if (existsSync(filepath)) {
    return requireFx(filepath);
  }
};

export const getUserConfig = () => {
  const userConfigPath = join(rootPath, "./typepack.ts");
  if (existsSync(userConfigPath)) {
    return requireFx(userConfigPath);
  }
  return {};
};