app.py

from flask import Flask, render_template, request, send_file, make_response
import io
import json
import os
import traceback

app = Flask(__name__)

@app.route('/health')
def health():
    return "OK", 200

@app.errorhandler(Exception)
def handle_exception(e):
    traceback.print_exc()
    return f"Internal Server Error: {str(e)}", 500

@app.route('/')
def index():
    return render_template('builder.html')

@app.route('/export', methods=['POST'])
def export():
    data = request.json
    
    # Generate the standalone HTML
    # We pass the JSON data to the template, which will be embedded into the JS
    html_content = render_template('export_template.html', 
                                   initial_data=json.dumps(data),
                                   page_title=data.get('title', 'Checklist'))
    
    # Create a file-like object
    mem = io.BytesIO()
    mem.write(html_content.encode('utf-8'))
    mem.seek(0)
    
    return send_file(
        mem,
        as_attachment=True,
        download_name=f"{data.get('title', 'checklist')}.html",
        mimetype='text/html'
    )

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=7860, debug=True)