import os
import re
import uuid
from flask import Flask, request, jsonify, send_from_directory

app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = os.environ.get('UPLOAD_FOLDER', '/uploads')
app.config['MAX_CONTENT_LENGTH'] = int(os.environ.get('MAX_CONTENT_LENGTH', '5')) * 1024 * 1024  # in MB

VALID_FILENAME_REGEX = r'^[a-zA-Z0-9\-_\.]+$'

UPLOAD_TOKEN = os.environ.get('UPLOAD_TOKEN')

def is_valid_filename(filename):
    return bool(re.match(VALID_FILENAME_REGEX, filename))

@app.route('/upload', methods=['POST'])
def upload_file():
    if 'file' not in request.files:
        return jsonify({'error': 'No file part in the request'}), 400

    if 'token' not in request.headers:
        return jsonify({'error': 'No token supplied'}), 401

    if request.headers['token'] != UPLOAD_TOKEN:
        return jsonify({'error': 'Invalid token supplied'}), 401

    file = request.files['file']
    if file.filename == '':
        return jsonify({'error': 'No file selected for upload'}), 400

    if not is_valid_filename(file.filename):
        return jsonify({'error': 'Invalid filename. Only alphanumeric characters, hyphens, underscores, and periods are allowed.'}), 400

    filename = file.filename
    file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
    return jsonify({'success': 'File {} successfully uploaded'.format(filename)})

@app.route('/download/<filename>', methods=['GET'])
def download_file(filename):
    try:
        return send_from_directory(app.config['UPLOAD_FOLDER'], filename)
    except FileNotFoundError:
        return jsonify({'error': 'File not found'}), 404

if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0', port=int(os.environ.get('PORT', 5000)))




# Upload
# curl -X POST -H "token: myuploadtoken" -F "file=@/path/to/file" http://docker10.grote.lan:5040/upload
# Download
# curl -X GET http://docker10.grote.lan:5040/download/filename.ext > filename.ext
# List
# curl -X GET http://docker10.grote.lan:5040/files
# Metriken
# curl -X GET http://docker10.grote.lan:5040/metrics



# upload check
# download

# farben im putput weg
# wsgi server