import gradio as gr, io, sys

class FSM:
    def __init__(self, initial_state, transitions):
        self.state = initial_state
        self.transitions = transitions

    def handle(self, event):
        key = (self.state, event)
        if key in self.transitions:
            self.state = self.transitions[key]
        print(f"  Event: {event:7s}  =>  State: {self.state}")

transitions = {
    ("closed", "open"):    "opened",
    ("closed", "lock"):    "locked",
    ("opened", "close"):   "closed",
    ("locked", "unlock"):  "closed",
}

fsm = FSM("closed", transitions)

buf = io.StringIO()
sys.stdout = buf
for event in ["open", "close", "lock", "open", "unlock", "open", "close"]:
    fsm.handle(event)
sys.stdout = sys.__stdout__

gr.Interface(fn=lambda: buf.getvalue(), inputs=[], outputs="text").launch()