import { WebClient } from 'https://deno.land/x/slack_web_api@6.7.2/mod.js'

const slackBotToken = Deno.env.get('SLACK_TOKEN') ?? ''
const botClient = new WebClient(slackBotToken)

console.log(`Slack URL verification function up and running!`)
Deno.serve(async (req) => {
  try {
    const { token, challenge, type, event } = await req.json()

    if (type == 'url_verification') {
      return new Response(JSON.stringify({ challenge }), {
        headers: { 'Content-Type': 'application/json' },
        status: 200,
      })
    } else if (event.type == 'app_mention') {
      const { user, text, channel, ts } = event
      // Here you should process the text received and return a response:
      const response = await botClient.chat.postMessage({
        channel: channel,
        text: `Hello <@${user}>!`,
        thread_ts: ts,
      })
      return new Response('ok', { status: 200 })
    }
  } catch (error) {
    return new Response(JSON.stringify({ error: error.message }), {
      headers: { 'Content-Type': 'application/json' },
      status: 500,
    })
  }
})