app-lab-4.js

const { App } = require('@slack/bolt')

// Initializes your app with your bot token and signing secret
const app = new App({
	token: process.env.SLACK_BOT_TOKEN,
	signingSecret: process.env.SLACK_SIGNING_SECRET
});

(async () => {
	// Start your app
	await app.start(process.env.PORT || 3000)

	console.log('⚡️Hello World.. Bolt app is running!')
})()

// A slash command that shows an ephemeral message
app.command('/weather-gen', async ({ command, context, ack }) => {
	ack()
	app.client.chat.postEphemeral({
		token: context.botToken,
		channel: command.channel_id,
		user: command.user_id,
		text: "Hello World",
		blocks: [
			{
				type: 'section',
				block_id: 'block1',
				text: {
					type: 'mrkdwn',
					text: 'Which city would you like a weather report for? :sunny::snowman_without_snow::umbrella:'
				},
				accessory: {
					type: 'external_select',
					placeholder: {
						type: 'plain_text',
						text: 'Select an item'
					},
					action_id: 'choose_city',
					min_query_length: 3
				}
			}
		]
	})
})

// responds with options
app.options({ action_id: 'choose_city' }, async ({ ack }) => {
	// Get information specific to a team or channel
	const results = [
		{ label: 'New York City', value: 'NYC' },
		{ label: 'London', value: 'LON' },
		{ label: 'San Francisco', value: 'SF' }
	]

	if (results) {
		const options = []

		// Collect information in options array to send in Slack ack response
		await results.forEach(result => {
			options.push({
				text: {
					type: 'plain_text',
					text: result.label
				},
				value: result.value
			})
		})
		console.log(options)
		ack({
			options
		})
	} else {
		ack()
	}
})

// prompt weather condition based on selection
app.action('choose_city', async ({ ack, say, action }) => {
	ack()
	const selectedCity = action.selected_option.value
	if (selectedCity === 'NYC') {
		say(`You selected the option ${action.selected_option.text.text} --> "It's 80 degrees right now in New York!`)
	}
	if (selectedCity === 'LON') {
		say(`You selected the option ${action.selected_option.text.text} --> "It's 60 degrees right now in London!`)
	}
	if (selectedCity === 'SF') {
		say(`You selected the option ${action.selected_option.text.text} --> "It's 70 degrees right now in San Francisco!`)
	}
})