/*
  Component Scaffolding Script
  This is a script that enables scaffolding a new JSS component using `jss scaffold <ComponentName>`.
  The default convention is that component names must start with a capital letter, and can contain
  letters, number, underscores, or dashes.
  
  If the <ComponentName> parameter includes a path, it must be relative to the src/components folder.
  For example, `jss scaffold search/SearchBox` will create a component called `SearchBox` in
  `src/components/search/SearchBox.tsx`. Specifying a relative path is optional, and just providing
  the name is ok.

  Edit this script if you wish to use your own conventions for component storage in your JSS app.
*/

/* eslint-disable no-throw-literal,no-console */

import fs from "fs";
import path from "path";
import chalk from "chalk";
import generateComponentSrc from "./templates/component-src";

const componentRootPath = "src/components";

// Matches component names that start with a capital letter, and contain only letters, number,
// underscores, or dashes. Optionally, the component name can be preceded by a relative path
const nameParamFormat = new RegExp(/^((?:[\w-]+\/)*)([A-Z][\w-]+)$/);
const componentArg = process.argv[2];

if (!componentArg) {
  throw "Component name was not passed. Usage: jss scaffold <ComponentName>";
}

const regExResult = nameParamFormat.exec(componentArg);

if (regExResult === null) {
  throw `Component name should start with an uppercase letter and contain only letters, numbers,
dashes, or underscores. If specifying a path, it must be relative to src/components`;
}

const componentPath = regExResult[1];
const componentName = regExResult[2];
const filename = `${componentName}.tsx`;

/**
 * Force to use `crlf` line endings, we are using `crlf` across the project.
 * Replace: `lf` (\n), `cr` (\r)
 * @param {string} content
 */
function editLineEndings(content: string) {
  return content.replace(/\r|\n/gm, "\r\n");
}

/**
 * Creates a file relative to the specified path if the file doesn't exist. Creates directories as needed.
 * @param {string} rootPath - the root path
 * @param {string} fileContent - the file content
 * @param {string} filename - the filename
 * @returns the new file's filepath
 */
function scaffoldFile(
  rootPath: string,
  fileContent: string,
  filename: string,
): string | null {
  const outputDir = path.join(rootPath, componentPath);
  const outputFile = path.join(outputDir, filename);

  if (fs.existsSync(outputFile)) {
    console.log(chalk.red(`Skipping creating ${outputFile}; already exists.`));
    return null;
  }

  fs.mkdirSync(outputDir, { recursive: true });
  fs.writeFileSync(outputFile, editLineEndings(fileContent), "utf8");
  console.log(chalk.green(`File ${outputFile} has been scaffolded.`));
  return outputFile;
}

const componentOutputPath = scaffoldFile(
  componentRootPath,
  generateComponentSrc(componentName),
  filename,
);

console.log(
  chalk.green(`
Scaffolding of ${componentName} complete.
Next steps:`),
);

if (componentOutputPath) {
  console.log(
    `* Implement the React component in ${chalk.green(componentOutputPath)}`,
  );
}