请利用状态机来编写

这里我提供一个简单的状态机来实现与ChitGPT进行对话的功能。

class ChitGPTStateMachine:
    def __init__(self):
        self.current_state = "start"

    def transition(self, input):
        if self.current_state == "start":
            if input == "hi" or input == "hello":
                self.current_state = "greet"
                return "Hello! How can I help you?"
            elif input == "bye":
                self.current_state = "end"
                return "Goodbye!"
            else:
                self.current_state = "unknown"
                return "Sorry, I didn't understand what you said. Could you please repeat?"

        elif self.current_state == "greet":
            if input == "how are you?":
                self.current_state = "ask_feelings"
                return "I'm doing well, thank you for asking. How about you?"
            elif input == "bye":
                self.current_state = "end"
                return "Goodbye!"
            else:
                self.current_state = "unknown"
                return "Sorry, I didn't understand what you said. Could you please repeat?"

        elif self.current_state == "ask_feelings":
            if input == "good" or input == "fine":
                self.current_state = "end"
                return "That's great to hear. Is there anything else you would like to talk about?"
            elif input == "not good" or input == "bad":
                self.current_state = "end"
                return "I'm sorry to hear that. Is there anything I can do to help?"
            elif input == "bye":
                self.current_state = "end"
                return "Goodbye!"
            else:
                self.current_state = "unknown"
                return "Sorry, I didn't understand what you said. Could you please repeat?"

        elif self.current_state == "unknown":
            if input == "bye":
                self.current_state = "end"
                return "Goodbye!"
            else:
                self.current_state = "start"
                return "I'm sorry, I didn't understand what you said. Could you please repeat?"

        elif self.current_state == "end":
            return "Sorry, I cannot respond as the conversation has ended."

这个状态机有四个状态：开始状态（start）、问候状态（greet）、询问情绪状态（ask_feelings）和未知状态（unknown）。状态之间的转换由用户的输入触发。如果输入与当前状态不匹配，则将状态设置为未知状态。当状态设置为结束状态时，状态机将不再响应任何输入。