import { ChildProcess, exec } from 'child_process';
import fs from 'fs-extra';
import path from 'path';
import { removeSync, copyFileSync } from 'fs-extra';
import packageJSON from './package.json';

const argv = process.argv.slice(2);
let buildIgnore: string[] = [];

const isTest = argv.length > 0 && argv[0] === 'test';
const isGUI = !(argv.length > 1 && argv[1] === 'false');

if (!isTest)
  buildIgnore = [
    '*/\\.env',
    '*/node_modules/*'
  ];

if (!isGUI)
  buildIgnore = buildIgnore.concat([
    './gui*',
    './build*'
  ]);


const ignore = [
  ...buildIgnore,
  '*/\\.git*',
  './lib*',
  '*/@types*',
  './out*',
  './bin/mkvtoolnix*',
  './config/token.yml$',
  './config/updates.json$',
  './config/cr_token.yml$',
  './config/funi_token.yml$',
  '*/\\.eslint*',
  '*/*\\.tsx?$',
  './fonts*',
  './gui/react*',
].map(a => a.replace(/\*/g, '[^]*').replace(/\.\//g, escapeRegExp(__dirname) + '/').replace(/\//g, path.sep === '\\' ? '\\\\' : '/')).map(a => new RegExp(a, 'i'));

export { ignore };

(async () => {

  const waitForProcess = async (proc: ChildProcess) => {
    return new Promise((resolve, reject) => {
      proc.stdout?.on('data', console.log);
      proc.stderr?.on('data', console.error);
      proc.on('close', resolve);
      proc.on('error', reject);
    });
  };

  process.stdout.write('Removing lib dir... ');
  removeSync('lib');
  process.stdout.write('✓\nRunning tsc... ');
  const tsc = exec('npx tsc');

  await waitForProcess(tsc);
  
  if (!isGUI) {
    fs.emptyDirSync(path.join('lib', 'gui'));
    fs.rmdirSync(path.join('lib', 'gui'));
  }

  if (!isTest && isGUI) {
    process.stdout.write('✓\nBuilding react... ');

    const installReactDependencies = exec('npm install', {
      cwd: path.join(__dirname, 'gui', 'react'),
    });

    await waitForProcess(installReactDependencies);
  
    const react = exec('npm run build', {
      cwd: path.join(__dirname, 'gui', 'react'),
    });
  
    await waitForProcess(react);
  }

  process.stdout.write('✓\nCopying files... ');
  if (!isTest && isGUI) {
    copyDir(path.join(__dirname, 'gui', 'react', 'build'), path.join(__dirname, 'lib', 'gui', 'electron', 'build'));
  }

  const files = readDir(__dirname);
  files.forEach(item => {
    const itemPath = path.join(__dirname, 'lib', item.path.replace(__dirname, ''));
    if (item.stats.isDirectory()) {
      if (!fs.existsSync(itemPath))
        fs.mkdirSync(itemPath);
    } else {
      copyFileSync(item.path, itemPath);
    }
  });

  process.stdout.write('✓\nInstalling dependencies... ');
  if (!isTest && !isGUI) {
    alterJSON();
  }
  if (!isTest) {
    const dependencies = exec(`npm install ${isGUI ? '' : '--production'}`, {
      cwd: path.join(__dirname, 'lib')
    });
    await waitForProcess(dependencies);
  }

  process.stdout.write('✓\n');
})();

function alterJSON() {
  packageJSON.main = 'index.js';
  fs.writeFileSync(path.join('lib', 'package.json'), JSON.stringify(packageJSON, null, 4));
}

function readDir (dir: string): {
  path: string,
  stats: fs.Stats
}[] {
  const items: {
    path: string,
    stats: fs.Stats
  }[] = [];
  const content = fs.readdirSync(dir);
  itemLoop: for (const item of content) {
    const itemPath = path.join(dir, item);
    for (const ignoreItem of ignore) {
      if (ignoreItem.test(itemPath))
        continue itemLoop;      
    }
    const stats = fs.statSync(itemPath);
    items.push({
      path: itemPath,
      stats
    });
    if (stats.isDirectory()) { 
      items.push(...readDir(itemPath));
    }
  }
  return items;
}

async function copyDir(src: string, dest: string) {
  await fs.promises.mkdir(dest, { recursive: true });
  const entries = await fs.promises.readdir(src, { withFileTypes: true });

  for (const entry of entries) {
    const srcPath = path.join(src, entry.name);
    const destPath = path.join(dest, entry.name);

    entry.isDirectory() ?
      await copyDir(srcPath, destPath) :
      await fs.promises.copyFile(srcPath, destPath);
  }
}

function escapeRegExp(string: string): string {
  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}