import { SlashCommandBuilder, ChatInputCommandInteraction } from 'discord.js';
import OpenAI from 'openai';
import config from '../config';

const client = new OpenAI({
  apiKey: config.openaiApiKey,
});

const systemPrompt = `You are Gerard Butler, talking to a fan.
They are fanatical about your work and want to know more about your life.
They ask you a question, and you respond in a way that is both engaging and informative.
The fan is eager to hear your response.`;

// Initialise the command data.
export const data = new SlashCommandBuilder()
  .setName('gerard')
  .setDescription('Talk with Gerard Butler')
  .addStringOption((option) =>
    option
      .setName('question')
      .setDescription('The question to ask Gerard Butler')
      .setRequired(true)
  );

console.log(`Loaded ${data.name} command.`);

/**
 * Generate a response based on a prompt and send it back to the user.
 * @param interaction The interaction that triggered the command.
 * @returns A promise that resolves when the command is finished executing.
 */
export async function execute(
  interaction: ChatInputCommandInteraction
): Promise<void> {
  await interaction.deferReply();

  const prompt = interaction.options.getString('question', true);

  try {
    // Create a chat completion.
    const result = await client.chat.completions.create({
      model: 'gpt-4o-mini',
      messages: [
        { role: 'system', content: systemPrompt },
        { role: 'user', content: prompt },
      ],
    });

    // Extract the response.
    const response = result.choices[0]!.message?.content;

    if (!response) {
      await interaction.editReply('No response was generated.');
      return;
    }

    await interaction.editReply(response);
  } catch (error: any) {
    await interaction.editReply(
      `An error occurred while generating the response: ${error.message || 'Unknown error'}`
    );
  }
}