POST_Combined.ts

export class ChatGptConversationService {
  /* ... */ 
	startConversation = async (
		id: string,
		systemPersona: string,
		persona: string,
		message: string
	) => {
		const startConversationTime = new Date();
		const startMessages: ChatCompletionMessageParam[] = [
			{ role: "system", content: systemPersona },
			{ role: "user", content: message },
		];
		const response = await openai.chat.completions.create({
			model: "gpt-3.5-turbo",
			messages: startMessages,
		});
		ConversationStorage[id] = {
			persona: persona,
			messages: startMessages
				.map((m) => ({ ...m, sent: startConversationTime }))
				.concat({
					role: "assistant",
					sent: new Date(),
					content: response.choices[0].message.content,
				}),
		};
		return response.choices[0].message.content;
	};
  /* ... */
}


export class InMemoryConversationService implements ConversationService {
  /* ... */
	createConversation = async (
		id: string,
		persona: string,
		initial: Message
	) => {
		const startingPrompt = personas[persona].prompt;
		const response = await this.chatgpt.startConversation(
			id,
			startingPrompt,
			persona,
			initial.text
		);

		if (!response) {
			throw new Error("No response from ChatGPT");
		}
		return this.chatgpt.getConversation(id);
	};
  /* ... */
}