#!/bin/bash
# new-node-project.sh - Scaffold a new Node.js project with best practices
# Usage: ./new-node-project.sh <project-name>

set -e

if [ -z "$1" ]; then
    echo "Error: Project name required"
    echo "Usage: $0 <project-name>"
    exit 1
fi

PROJECT_NAME="$1"

if [ -d "$PROJECT_NAME" ]; then
    echo "Error: Directory '$PROJECT_NAME' already exists"
    exit 1
fi

echo "Creating Node.js project: $PROJECT_NAME"

mkdir -p "$PROJECT_NAME"
cd "$PROJECT_NAME"

cat > package.json << 'EOF'
{
  "name": "PROJECT_NAME_PLACEHOLDER",
  "version": "1.0.0",
  "description": "A new Node.js project",
  "main": "index.js",
  "scripts": {
    "start": "node index.js",
    "test": "jest",
    "dev": "nodemon index.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "jest": "^29.0.0",
    "nodemon": "^3.0.0"
  }
}
EOF

sed -i "s/PROJECT_NAME_PLACEHOLDER/$PROJECT_NAME/g" package.json

cat > index.js << 'EOF'
#!/usr/bin/env node
/**
 * Main entry point for PROJECT_NAME_PLACEHOLDER
 */

console.log('Hello from PROJECT_NAME_PLACEHOLDER!');

module.exports = {
  greet: (name) => `Hello, ${name}!`
};
EOF

sed -i "s/PROJECT_NAME_PLACEHOLDER/$PROJECT_NAME/g" index.js

cat > .gitignore << 'EOF'
node_modules/
.env
.DS_Store
*.log
npm-debug.log*
EOF

mkdir -p src test

touch src/index.js
touch test/index.test.js

cat > test/index.test.js << 'EOF'
const { greet } = require('../index');

describe('greet', () => {
  test('returns greeting with name', () => {
    expect(greet('World')).toBe('Hello, World!');
  });
});
EOF

cat > README.md << 'EOF'
# PROJECT_NAME_PLACEHOLDER

A Node.js project.

## Setup

\`\`\`bash
npm install
\`\`\`

## Usage

\`\`\`bash
npm start
\`\`\`

## Development

\`\`\`bash
npm run dev
\`\`\`

## Testing

\`\`\`bash
npm test
\`\`\`
EOF

sed -i "s/PROJECT_NAME_PLACEHOLDER/$PROJECT_NAME/g" README.md

echo ""
echo "Project '$PROJECT_NAME' created successfully!"
echo "Next steps:"
echo "  1. cd $PROJECT_NAME"
echo "  2. npm install"
echo "  3. npm start"