const ISO6391 = require('iso-639-1')
const _ = require('lodash')

// Return a friendly language name for ISO language codes
function getLanguageName(isocode) {
  try {
    return ISO6391.getName(isocode)
  } catch (err) {
    console.error(err)
    return "Unknown"
  }
}

// Format numbers over 1000
function kFormatter(num) {
    return Math.abs(num) > 999 ? Math.sign(num)*((Math.abs(num)/1000).toFixed(1)) + 'k' : Math.sign(num)*Math.abs(num)
}

// Format the Tweet as a quoted Slack message
let quotedMessage = ''
event.full_text.split('\n').forEach(line => quotedMessage = quotedMessage + '> ' + line + '\n' )


// Define metadata to include in the Slack message
const language = `${getLanguageName(event.lang)} (${event.lang})`
let type = "Original Tweet"
let intro = "New mention"
if (event.in_reply_to_status_id) {
  type = "Reply"
	intro = "New reply"
}
if (event.retweeted_status) {
	type = "Retweet"
	intro = "Retweet"
}
const tweetUrl = `https://twitter.com/${event.user.screen_name}/statuses/${event.id_str}`
const userUrl = `https://twitter.com/${event.user.screen_name}/`
const mediaUrl = _.get(steps, 'trigger.event.extended_entities.media[0].media_url_https', '')
const mediaType = _.get(steps, 'trigger.event.extended_entities.media[0].type', '')

// Format the message as Slack blocks
// https://api.slack.com/block-kit
const blocks = []
blocks.push({
	"type": "section",
	"text": {
		"type": "mrkdwn",
		"text": `*<${tweetUrl}|${intro}> by <${userUrl}|${event.user.screen_name}> (${event.created_at}):*\n${quotedMessage}`
	},
		"accessory": {
			"type": "image",
			"image_url": event.user.profile_image_url_https,
			"alt_text": "Profile picture"
		}
})

if(mediaUrl !== '' && mediaType === 'photo') {
	blocks.push({
		"type": "image",
		"image_url": mediaUrl,
		"alt_text": "Tweet Image"
	})
}

blocks.push({
	"type": "context",
	"elements": [
		{
			"type": "mrkdwn",
			"text": `*User:* ${event.user.screen_name}`
		},
		{
			"type": "mrkdwn",
			"text": `*Followers:* ${kFormatter(event.user.followers_count)}`
		},
		{
			"type": "mrkdwn",
			"text": `*Location:* ${event.user.location}`
		},
		{
			"type": "mrkdwn",
			"text": `*Type:* ${type}`
		},
		{
			"type": "mrkdwn",
			"text": `*Original Language:* ${language}`
		},
		{
			"type": "mrkdwn",
			"text": `*Description:* ${event.user.description}`
		}
	]
},
{
	"type": "actions",
	"elements": [
		{
			"type": "button",
			"text": {
				"type": "plain_text",
				"text": "View on Twitter",
				"emoji": true
			},
			"url": tweetUrl
		}
	]
},
{
	"type": "context",
	"elements": [
		{
			"type": "mrkdwn",
			"text": `Sent via <https://pipedream.com/@/${steps.trigger.context.workflow_id}|Pipedream>`
		}
	]
},
{
	"type": "divider"
})

return blocks