import subprocess
import json
import time
from flask import Flask, request, jsonify, session
from I2C_Function import analyze_data, read_data
from flask_cors import CORS

app = Flask(__name__)
CORS(app)

initialized = False

@app.route('/trng/randomNum/init', methods=['GET'])
def initialize_generator():
    global initialized  # Zugriff auf die globale Variable
    
    #parameter 1 und 2 sind default values für Tests
    result = analyze_data(int(1), int(1), startup=True)

    if result is True:
        initialized = True
        return jsonify({'message': 'successful operation; random number generator is ready and random numbers can be requested'}), 200
    else:
        return jsonify({'error': 'Unable to initialize the random number generator within a timeout of 60 seconds.'}), 555


@app.route('/trng/randomNum/getRandom', methods=['GET'])
def get_random_numbers():
    global initialized  # Zugriff auf die globale Variable
    quantity = request.args.get('quantity')
    bits = request.args.get('numBits')

    if not quantity.isdigit() or not bits.isdigit():
        return jsonify({'error': 'Invalid input. Quantity and bits must be numeric.'}), 400

    if int(quantity) <= 0 or int(bits) <= 0:
        return jsonify({'error': 'Invalid input. Quantity and bits must be positive integers.'}), 400
    
    # Überprüfe den Initialisierungsstatus
    if not initialized:
        return jsonify({'error': 'system not ready; try init'}), 432  

    random_numbers = analyze_data(int(quantity), int(bits), startup=False)    
            
    if random_numbers is False:
        return jsonify({'error': 'Unable to generate random numbers.'}), 500
    if random_numbers:        
        data = {'randomNumbers': random_numbers}  # Erstellen des Datenobjekts mit dem JSON-String
        return jsonify(data), 200
    else:
        return jsonify({'error': 'Unable to generate random numbers.'}), 500
    
@app.route('/trng/randomNum/shutdown', methods=['GET'])
def shutdown_generator(): 
    global initialized  # Zugriff auf die globale Variable

    initialized = False  # Setze den Initialisierungsstatus zurück

    # Beispielantwort
    return jsonify({'message': "successful operation; random number generator has been set to 'standby mode'"}), 200

if __name__ == '__main__':
    
    # Pfade zu den SSL-Zertifikat- und Schlüsseldateien    
    cert_path = '/etc/nginx/ssl/cert-gmtrom.pem'
    key_path = '/etc/nginx/ssl/cert-gmtrom-key.pem'
    
    #alte Zertifikate self signed
    #cert_path = '/etc/nginx/ssl/server.crt'
    #key_path = '/etc/nginx/ssl/server.key'
    
    # Starte die Flask-Anwendung mit SSL-Konfiguration
    app.run(host='0.0.0.0', ssl_context=(cert_path, key_path))
    #app.run(host='172.16.78.57', port=5000, ssl_context=(cert_path, key_path))    
    #app.run(host='0.0.0.0', ssl_context=adhoc)
    #app.run(ssl_context=(cert_path, key_path))