from flask import request, Blueprint, jsonify

simulation_blueprint = Blueprint('simulation_blueprint', __name__)

class SimulationController:
    def __init__(self):
        pass

    def harmonic_progression(self, n):
        sum = 0
        for i in range(1, n):
            sum += 1/i

        return sum

    def return_helloworld(self):
        return jsonify(message="Hello World!")

simulation_controller = SimulationController()

@simulation_blueprint.route('/simulation/harmonic-progression', methods=['GET'])
def return_ok():
    n = int(request.args.get('n'))
    sum = simulation_controller.harmonic_progression(n)

    return str(sum), 200

@simulation_blueprint.route('/simulation/json', methods=['GET'])
def return_helloworld():
    return simulation_controller.return_helloworld(), 200