/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

// eslint-disable-next-line import/no-extraneous-dependencies
const rimraf = require('rimraf');
const {readFileSync, writeFileSync, readdirSync} = require('fs');
const {execSync} = require('child_process');

// Generate one example per init template
// We use those generated examples as CodeSandbox projects
// See https://github.com/facebook/docusaurus/issues/1699
function generateTemplateExample(template) {
  try {
    console.log(
      `generating ${template} template for codesandbox in the examples folder...`,
    );

    // run the docusaurus script to bootstrap the template in the examples folder
    const command = template.endsWith('-typescript')
      ? template.replace('-typescript', ' -- --typescript')
      : template;
    execSync(
      // /!\ we use the published init script on purpose,
      // because using the local init script is too early and could generate upcoming/unavailable config options
      // remember CodeSandbox templates will use the published version, not the repo version
      `npm init docusaurus@latest examples/${template} ${command}`,
      // `node ./packages/docusaurus-init/bin/index.js init examples/${template} ${template}`,
      {
        stdio: 'inherit',
      },
    );

    // read the content of the package.json
    const templatePackageJson = JSON.parse(
      readFileSync(`examples/${template}/package.json`, 'utf8'),
    );

    // attach the dev script which would be used in code sandbox by default
    templatePackageJson.scripts.dev = 'docusaurus start';

    // these example projects are not meant to be published to npm
    templatePackageJson.private = true;

    // make sure package.json name is not "examples-classic"
    // the package.json name appear in CodeSandbox UI so let's display a good name!
    // unfortunately we can't use uppercase or spaces
    // see also https://github.com/codesandbox/codesandbox-client/pull/5136#issuecomment-763521662
    templatePackageJson.name =
      template === 'classic' ? 'docusaurus' : `docusaurus-${template}`;
    templatePackageJson.description =
      template === 'classic'
        ? 'Docusaurus example project'
        : `Docusaurus example project (${template} template)`;

    // rewrite the package.json file with the new edit
    writeFileSync(
      `./examples/${template}/package.json`,
      JSON.stringify(templatePackageJson, null, 2),
    );

    // create sandbox.config.json file at the root of template
    const codeSanboxConfig = {
      infiniteLoopProtection: true,
      hardReloadOnChange: true,
      view: 'browser',
      template: 'docusaurus',
      node: '14',
      container: {
        node: '14',
      },
    };
    writeFileSync(
      `./examples/${template}/sandbox.config.json`,
      JSON.stringify(codeSanboxConfig, null, 2),
    );

    const stackBlitzConfig = {
      installDependencies: true,
      startCommand: 'npm start',
    };
    writeFileSync(
      `./examples/${template}/.stackblitzrc`,
      JSON.stringify(stackBlitzConfig, null, 2),
    );

    console.log(`Generated example for template ${template}`);
  } catch (error) {
    console.error(`Failed to generated example for template ${template}`);
    throw error;
  }
}

/*
Starters are repositories/branches that only contains a newly initialized Docusaurus site
Those are useful for users to inspect (may be more convenient than "examples/classic)
Also some tools like Netlify deploy button currently require using the main branch of a dedicated repo
See https://github.com/jamstack/jamstack.org/pull/609
Button visible here: https://jamstack.org/generators/
 */
function updateStarters() {
  function forcePushGitSubtree({subfolder, remote, remoteBranch}) {
    console.log('');
    // See https://stackoverflow.com/questions/33172857/how-do-i-force-a-subtree-push-to-overwrite-remote-changes
    const command = `git push ${remote} \`git subtree split --prefix ${subfolder}\`:${remoteBranch} --force`;
    try {
      console.log(`forcePushGitSubtree command: ${command}`);
      execSync(command);
      console.log('forcePushGitSubtree success!');
    } catch (e) {
      console.error(
        `Can't force push to git subtree with command '${command}'`,
      );
      console.error(`If it's a permission problem, ask @slorber`);
      console.error(e);
    }
    console.log('');
  }

  console.log('');

  console.log('Updating https://github.com/facebook/docusaurus/tree/starter');
  forcePushGitSubtree({
    subfolder: 'examples/classic',
    remote: 'origin',
    remoteBranch: 'starter',
  });

  console.log('');
  console.log('');

  // TODO replace by starter repo in Docusaurus-community org (if we get it)
  console.log('Updating https://github.com/slorber/docusaurus-starter');
  forcePushGitSubtree({
    subfolder: 'examples/classic',
    remote: 'git@github.com:slorber/docusaurus-starter.git',
    remoteBranch: 'main',
  });

  console.log('');
}

function run() {
  const branch = execSync('git rev-parse --abbrev-ref HEAD').toString();
  if (branch === 'main') {
    throw new Error(
      "Please don't generate Docusaurus examples from the main branch!\nWe are going to commit during this process!",
    );
  }
  try {
    execSync('git diff --exit-code');
  } catch (e) {
    throw new Error(
      'Please run the generate examples command with a clean Git state and no uncommited local changes. git diff should display nothing!',
    );
  }

  console.log('');
  console.log('# Generate examples start!');
  console.log('');

  // delete the examples directories if they exists
  console.log('-------');
  console.log('## Removing example folders...');
  rimraf.sync('./examples/classic');
  rimraf.sync('./examples/classic-typescript');
  rimraf.sync('./examples/facebook');
  console.log('');

  // get the list of all available templates
  console.log('-------');
  console.log('## Generate example folders...');
  console.log('');
  const excludes = ['README.md', 'shared'];
  const templates = readdirSync(
    './packages/create-docusaurus/templates',
  ).filter((name) => !excludes.includes(name));
  console.log(`Will generate examples for templates: ${templates}`);
  templates.forEach(generateTemplateExample);
  console.log('Commiting changes');
  execSync('git add examples');
  execSync("git commit -am 'update examples' --allow-empty");
  console.log('');

  // update starters
  console.log('-------');
  console.log('# Updating starter repos and branches ...');
  console.log('It can take some time... please wait until done...');
  updateStarters();

  console.log('');
  console.log('-------');
  console.log('');
  console.log('Generate examples end!');
  console.log("Don't forget to push and merge your pull-request!");
  console.log('');
}

run();