const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');

const packageJson = require('./package.json');
const jestConfig = require('./jest.json');
const devDependencies = require('./devDependencies.json');

const deleteFile = (fileName) => fs.unlinkSync(path.join(process.cwd(), fileName));
const writeFile = (fileName, data) => fs.writeFileSync(path.join(process.cwd(), fileName), data);
const isYarnAvailable = () => {
    try {
        execSync('yarn --version', { stdio: 'ignore' });
        return true;
    } catch (exc) {
        return false;
    }
};

const packageManager = isYarnAvailable() ? 'yarn' : 'npm';
const execOptions = { stdio: 'inherit' };

console.log('🔄 Please wait...\n');

packageJson.scripts.start = `${packageJson.scripts.start} --config ../../../../rn-cli.config.js`;
packageJson.jest = Object.assign(packageJson.jest, jestConfig);
writeFile('package.json', JSON.stringify(packageJson, null, 2));

console.log(`📦 Installing dependencies with ${packageManager}...\n`);

switch (packageManager) {
    case 'yarn':
        execSync(`yarn add ${devDependencies.join(' ')} --dev --exact`, execOptions);
        break;
    default:
        execSync(`npm i ${devDependencies.join(' ')} --save-dev --save-exact`, execOptions);
}

deleteFile('App.js');
deleteFile('__tests__/App.js');
deleteFile('.flowconfig');
deleteFile('devDependencies.json');
deleteFile('jest.json');
deleteFile('README.md');
deleteFile('LICENSE');
deleteFile('setup.js');

console.log(`\n✅ Setup completed! You can now start with: ${packageManager} start\n`);