import { spawn, execSync } from 'child_process';
import getPort, { portNumbers } from 'get-port';
import { globby } from 'globby';
import { deleteSync } from 'del';
import browserSync from 'browser-sync';
import chalk from 'chalk';
import commandLineArgs from 'command-line-args';
import esbuild from 'esbuild';
import fs from 'fs';
import copy from 'recursive-copy';

const abortController = new AbortController();
const abortSignal = abortController.signal;

function buildTheDocs({ watch = false }) {
  if (!watch) {
    return execSync('npx @11ty/eleventy', { stdio: 'inherit', cwd: 'docs' });
  }

  return spawn('npx', ['@11ty/eleventy', '--watch', '--incremental'], { stdio: 'inherit', cwd: 'docs', signal: abortSignal });
}

const { bundle, copydir, dir, serve, types } = commandLineArgs([
  { name: 'bundle', type: Boolean },
  { name: 'copydir', type: String },
  { name: 'dir', type: String, defaultValue: 'dist' },
  { name: 'serve', type: Boolean },
  { name: 'types', type: Boolean }
]);

const outdir = dir;

deleteSync(outdir);
fs.mkdirSync(outdir, { recursive: true });

;(async () => {
  try {
    execSync(`node scripts/make-metadata.js --outdir "${outdir}"`, { stdio: 'inherit' });
    execSync(`node scripts/make-react.js --outdir "${outdir}"`, { stdio: 'inherit' });
    execSync(`node scripts/make-web-types.js --outdir "${outdir}"`, { stdio: 'inherit' });
    execSync(`node scripts/make-themes.js --outdir "${outdir}"`, { stdio: 'inherit' });
    execSync(`node scripts/make-icons.js --outdir "${outdir}"`, { stdio: 'inherit' });
    if (types) {
      console.log('Running the TypeScript compiler...');
      execSync(`tsc --project ./tsconfig.prod.json --outdir "${outdir}"`, { stdio: 'inherit' });
    }
  } catch (err) {
    console.error(chalk.red(err));
    process.exit(1);
  }

  const alwaysExternal = ['@lit-labs/react', 'react'];
  const buildResult = await esbuild
    .build({
      format: 'esm',
      target: 'es2017',
      entryPoints: [
        //
        // NOTE: Entry points must be mapped in package.json > exports, otherwise users won't be able to import them!
        //
        // The whole shebang
        './src/shoelace.ts',
        // The auto-loader
        './src/shoelace-autoloader.ts',
        // Components
        ...(await globby('./src/components/**/!(*.(style|test)).ts')),
        // Translations
        ...(await globby('./src/translations/**/*.ts')),
        // Public utilities
        ...(await globby('./src/utilities/**/!(*.(style|test)).ts')),
        // Theme stylesheets
        ...(await globby('./src/themes/**/!(*.test).ts')),
        // React wrappers
        ...(await globby('./src/react/**/*.ts'))
      ],
      outdir,
      chunkNames: 'chunks/[name].[hash]',
      incremental: serve,
      define: {
        // Floating UI requires this to be set
        'process.env.NODE_ENV': '"production"'
      },
      bundle: true,
      //
      // We don't bundle certain dependencies in the unbundled build. This ensures we ship bare module specifiers,
      // allowing end users to better optimize when using a bundler. (Only packages that ship ESM can be external.)
      //
      // We never bundle React or @lit-labs/react though!
      //
      external: bundle
        ? alwaysExternal
        : [...alwaysExternal, '@floating-ui/dom', '@shoelace-style/animations', 'lit', 'qr-creator'],
      splitting: true,
      plugins: []
    })
    .catch(err => {
      console.error(chalk.red(err));
      process.exit(1);
    });

  // Copy the build output to an additional directory
  if (copydir) {
    deleteSync(copydir);
    copy(outdir, copydir);
  }

  console.log(chalk.green(`The build has been generated at ${outdir} 📦\n`));

  if (serve) {
    // Dev
    buildTheDocs({ watch: true });

    const bs = browserSync.create();
    const port = await getPort({
      port: portNumbers(4000, 4999)
    });

    const browserSyncConfig = {
      startPath: '/',
      port,
      logLevel: 'silent',
      logPrefix: '[shoelace]',
      logFileChanges: true,
      notify: false,
      single: true,
      ghostMode: false,
      server: {
        baseDir: '_site',
        routes: {
          '/dist': './dist'
        }
      }
    };

    // Launch browser sync
    bs.init(browserSyncConfig, () => {
      const url = `http://localhost:${port}`;
      console.log(chalk.cyan(`Launched the Shoelace dev server at ${url} 🥾\n`));
    });

    // Rebuild and reload when source files change
    bs.watch(['src/**/!(*.test).*']).on('change', async filename => {
      console.log(`Source file changed - ${filename}`);

      buildResult
        // Rebuild and reload
        .rebuild()
        .then(() => {
          // Rebuild stylesheets when a theme file changes
          if (/^src\/themes/.test(filename)) {
            execSync(`node scripts/make-themes.js --outdir "${outdir}"`, { stdio: 'inherit' });
          }
        })
        .then(() => {
          // Skip metadata when styles are changed
          if (/(\.css|\.styles\.ts)$/.test(filename)) {
            return;
          }

          execSync(`node scripts/make-metadata.js --outdir "${outdir}"`, { stdio: 'inherit' });
        })
        .then(() => bs.reload())
        .catch(err => console.error(chalk.red(err)));
    });

    // Reload without rebuilding when the docs change
    bs.watch(['_site/**/*.*']).on('change', async (filename) => {
      console.log(`File changed - ${filename}`);

      // TODO: I tried writing a debounce here, but it wasnt working -.-
      bs.reload()
    });
  } else {
    // Prod build
    buildTheDocs();
  }

  // Cleanup on exit
  process.on('SIGTERM', () => {
    buildResult.rebuild.dispose()
    abortController.abort(); // Stops the child process
  });
})();