InfiniteAPI/src/Utils/messages.ts

import { Boom } from '@hapi/boom'
import axios from 'axios'
import { randomBytes } from 'crypto'
import { promises as fs } from 'fs'
import { type Transform } from 'stream'
import { proto } from '../../WAProto'
import { MEDIA_KEYS, URL_REGEX, WA_DEFAULT_EPHEMERAL } from '../Defaults'
import {
	AnyMediaMessageContent,
	AnyMessageContent,
	DownloadableMessage,
	MediaGenerationOptions,
	MediaType,
	MessageContentGenerationOptions,
	MessageGenerationOptions,
	MessageGenerationOptionsFromContent,
	MessageType,
	MessageUserReceipt,
	WAMediaUpload,
	WAMessage,
	WAMessageContent,
	WAMessageStatus,
	WAProto,
	WATextMessage
} from '../Types'
import { isJidGroup, isJidStatusBroadcast, jidNormalizedUser } from '../WABinary'
import { sha256 } from './crypto'
import { generateMessageIDV2, getKeyAuthor, unixTimestampSeconds } from './generics'
import { ILogger } from './logger'
import {
	downloadContentFromMessage,
	encryptedStream,
	generateThumbnail,
	getAudioDuration,
	getAudioWaveform,
	MediaDownloadOptions
} from './messages-media'

type MediaUploadData = {
	media: WAMediaUpload
	caption?: string
	ptt?: boolean
	ptv?: boolean
	seconds?: number
	gifPlayback?: boolean
	fileName?: string
	jpegThumbnail?: string
	mimetype?: string
	width?: number
	height?: number
	waveform?: Uint8Array
	backgroundArgb?: number
}

const MIMETYPE_MAP: { [T in MediaType]?: string } = {
	image: 'image/jpeg',
	video: 'video/mp4',
	document: 'application/pdf',
	audio: 'audio/ogg; codecs=opus',
	sticker: 'image/webp',
	'product-catalog-image': 'image/jpeg'
}

const MessageTypeProto = {
	image: WAProto.Message.ImageMessage,
	video: WAProto.Message.VideoMessage,
	audio: WAProto.Message.AudioMessage,
	sticker: WAProto.Message.StickerMessage,
	document: WAProto.Message.DocumentMessage
} as const

/**
 * Uses a regex to test whether the string contains a URL, and returns the URL if it does.
 * @param text eg. hello https://google.com
 * @returns the URL, eg. https://google.com
 */
export const extractUrlFromText = (text: string) => text.match(URL_REGEX)?.[0]

export const generateLinkPreviewIfRequired = async (
	text: string,
	getUrlInfo: MessageGenerationOptions['getUrlInfo'],
	logger: MessageGenerationOptions['logger']
) => {
	const url = extractUrlFromText(text)
	if (!!getUrlInfo && url) {
		try {
			const urlInfo = await getUrlInfo(url)
			return urlInfo
		} catch (error) {
			// ignore if fails
			logger?.warn({ trace: error.stack }, 'url generation failed')
		}
	}
}

const assertColor = async color => {
	let assertedColor
	if (typeof color === 'number') {
		assertedColor = color > 0 ? color : 0xffffffff + Number(color) + 1
	} else {
		let hex = color.trim().replace('#', '')
		if (hex.length <= 6) {
			hex = 'FF' + hex.padStart(6, '0')
		}

		assertedColor = parseInt(hex, 16)
		return assertedColor
	}
}

export const prepareWAMessageMedia = async (message: AnyMediaMessageContent, options: MediaGenerationOptions) => {
	const logger = options.logger

	let mediaType: (typeof MEDIA_KEYS)[number] | undefined
	for (const key of MEDIA_KEYS) {
		if (key in message) {
			mediaType = key
		}
	}

	if (!mediaType) {
		throw new Boom('Invalid media type', { statusCode: 400 })
	}

	const uploadData: MediaUploadData = {
		...message,
		media: message[mediaType]
	}
	delete uploadData[mediaType]
	// check if cacheable + generate cache key
	const cacheableKey =
		typeof uploadData.media === 'object' &&
		'url' in uploadData.media &&
		!!uploadData.media.url &&
		!!options.mediaCache &&
		// generate the key
		mediaType + ':' + uploadData.media.url.toString()

	if (mediaType === 'document' && !uploadData.fileName) {
		uploadData.fileName = 'file'
	}

	if (!uploadData.mimetype) {
		uploadData.mimetype = MIMETYPE_MAP[mediaType]
	}

	// check for cache hit
	if (cacheableKey) {
		const mediaBuff = options.mediaCache!.get<Buffer>(cacheableKey)
		if (mediaBuff) {
			logger?.debug({ cacheableKey }, 'got media cache hit')

			const obj = WAProto.Message.decode(mediaBuff)
			const key = `${mediaType}Message`

			Object.assign(obj[key], { ...uploadData, media: undefined })

			return obj
		}
	}

	const requiresDurationComputation = mediaType === 'audio' && typeof uploadData.seconds === 'undefined'
	const requiresThumbnailComputation =
		(mediaType === 'image' || mediaType === 'video') && typeof uploadData['jpegThumbnail'] === 'undefined'
	const requiresWaveformProcessing = mediaType === 'audio' && uploadData.ptt === true
	const requiresAudioBackground = options.backgroundColor && mediaType === 'audio' && uploadData.ptt === true
	const requiresOriginalForSomeProcessing = requiresDurationComputation || requiresThumbnailComputation
	const { mediaKey, encWriteStream, bodyPath, fileEncSha256, fileSha256, fileLength, didSaveToTmpPath } =
		await encryptedStream(uploadData.media, options.mediaTypeOverride || mediaType, {
			logger,
			saveOriginalFileIfRequired: requiresOriginalForSomeProcessing,
			opts: options.options
		})
	// url safe Base64 encode the SHA256 hash of the body
	const fileEncSha256B64 = fileEncSha256.toString('base64')
	const [{ mediaUrl, directPath }] = await Promise.all([
		(async () => {
			const result = await options.upload(encWriteStream, {
				fileEncSha256B64,
				mediaType,
				timeoutMs: options.mediaUploadTimeoutMs
			})
			logger?.debug({ mediaType, cacheableKey }, 'uploaded media')
			return result
		})(),
		(async () => {
			try {
				if (requiresThumbnailComputation) {
					const { thumbnail, originalImageDimensions } = await generateThumbnail(
						bodyPath!,
						mediaType as 'image' | 'video',
						options
					)
					uploadData.jpegThumbnail = thumbnail
					if (!uploadData.width && originalImageDimensions) {
						uploadData.width = originalImageDimensions.width
						uploadData.height = originalImageDimensions.height
						logger?.debug('set dimensions')
					}

					logger?.debug('generated thumbnail')
				}

				if (requiresDurationComputation) {
					uploadData.seconds = await getAudioDuration(bodyPath!)
					logger?.debug('computed audio duration')
				}

				if (requiresWaveformProcessing) {
					uploadData.waveform = await getAudioWaveform(bodyPath!, logger)
					logger?.debug('processed waveform')
				}

				if (requiresAudioBackground) {
					uploadData.backgroundArgb = await assertColor(options.backgroundColor)
					logger?.debug('computed backgroundColor audio status')
				}
			} catch (error) {
				logger?.warn({ trace: error.stack }, 'failed to obtain extra info')
			}
		})()
	]).finally(async () => {
		encWriteStream.destroy()
		// remove tmp files
		if (didSaveToTmpPath && bodyPath) {
			try {
				await fs.access(bodyPath)
				await fs.unlink(bodyPath)
				logger?.debug('removed tmp file')
			} catch (error) {
				logger?.warn('failed to remove tmp file')
			}
		}
	})

	const obj = WAProto.Message.fromObject({
		[`${mediaType}Message`]: MessageTypeProto[mediaType].fromObject({
			url: mediaUrl,
			directPath,
			mediaKey,
			fileEncSha256,
			fileSha256,
			fileLength,
			mediaKeyTimestamp: unixTimestampSeconds(),
			...uploadData,
			media: undefined
		})
	})

	if (uploadData.ptv) {
		obj.ptvMessage = obj.videoMessage
		delete obj.videoMessage
	}

	if (cacheableKey) {
		logger?.debug({ cacheableKey }, 'set cache')
		options.mediaCache!.set(cacheableKey, WAProto.Message.encode(obj).finish())
	}

	return obj
}

export const prepareDisappearingMessageSettingContent = (ephemeralExpiration?: number) => {
	ephemeralExpiration = ephemeralExpiration || 0
	const content: WAMessageContent = {
		ephemeralMessage: {
			message: {
				protocolMessage: {
					type: WAProto.Message.ProtocolMessage.Type.EPHEMERAL_SETTING,
					ephemeralExpiration
				}
			}
		}
	}
	return WAProto.Message.fromObject(content)
}

/**
 * Generate forwarded message content like WA does
 * @param message the message to forward
 * @param options.forceForward will show the message as forwarded even if it is from you
 */
export const generateForwardMessageContent = (message: WAMessage, forceForward?: boolean) => {
	let content = message.message
	if (!content) {
		throw new Boom('no content in message', { statusCode: 400 })
	}

	// hacky copy
	content = normalizeMessageContent(content)
	content = proto.Message.decode(proto.Message.encode(content!).finish())

	let key = Object.keys(content)[0] as MessageType

	let score = content[key].contextInfo?.forwardingScore || 0
	score += message.key.fromMe && !forceForward ? 0 : 1
	if (key === 'conversation') {
		content.extendedTextMessage = { text: content[key] }
		delete content.conversation

		key = 'extendedTextMessage'
	}

	if (score > 0) {
		content[key].contextInfo = { forwardingScore: score, isForwarded: true }
	} else {
		content[key].contextInfo = {}
	}

	return content
}

export const generateWAMessageContent = async (
	message: AnyMessageContent,
	options: MessageContentGenerationOptions
) => {
	let m: WAMessageContent = {}
	if ('text' in message) {
		const extContent = { text: message.text } as WATextMessage

		let urlInfo = message.linkPreview
		if (typeof urlInfo === 'undefined') {
			urlInfo = await generateLinkPreviewIfRequired(message.text, options.getUrlInfo, options.logger)
		}

		if (urlInfo) {
			extContent.matchedText = urlInfo['matched-text']
			extContent.jpegThumbnail = urlInfo.jpegThumbnail
			extContent.description = urlInfo.description
			extContent.title = urlInfo.title
			extContent.previewType = 0

			const img = urlInfo.highQualityThumbnail
			if (img) {
				extContent.thumbnailDirectPath = img.directPath
				extContent.mediaKey = img.mediaKey
				extContent.mediaKeyTimestamp = img.mediaKeyTimestamp
				extContent.thumbnailWidth = img.width
				extContent.thumbnailHeight = img.height
				extContent.thumbnailSha256 = img.fileSha256
				extContent.thumbnailEncSha256 = img.fileEncSha256
			}
		}

		if (options.backgroundColor) {
			extContent.backgroundArgb = await assertColor(options.backgroundColor)
		}

		if (options.font) {
			extContent.font = options.font
		}

		m.extendedTextMessage = extContent
	} else if ('contacts' in message) {
		const contactLen = message.contacts.contacts.length
		if (!contactLen) {
			throw new Boom('require atleast 1 contact', { statusCode: 400 })
		}

		if (contactLen === 1) {
			m.contactMessage = WAProto.Message.ContactMessage.fromObject(message.contacts.contacts[0])
		} else {
			m.contactsArrayMessage = WAProto.Message.ContactsArrayMessage.fromObject(message.contacts)
		}
	} else if ('location' in message) {
		m.locationMessage = WAProto.Message.LocationMessage.fromObject(message.location)
	} else if ('react' in message) {
		if (!message.react.senderTimestampMs) {
			message.react.senderTimestampMs = Date.now()
		}

		m.reactionMessage = WAProto.Message.ReactionMessage.fromObject(message.react)
	} else if ('delete' in message) {
		m.protocolMessage = {
			key: message.delete,
			type: WAProto.Message.ProtocolMessage.Type.REVOKE
		}
	} else if ('forward' in message) {
		m = generateForwardMessageContent(message.forward, message.force)
	} else if ('disappearingMessagesInChat' in message) {
		const exp =
			typeof message.disappearingMessagesInChat === 'boolean'
				? message.disappearingMessagesInChat
					? WA_DEFAULT_EPHEMERAL
					: 0
				: message.disappearingMessagesInChat
		m = prepareDisappearingMessageSettingContent(exp)
	} else if ('groupInvite' in message) {
		m.groupInviteMessage = {}
		m.groupInviteMessage.inviteCode = message.groupInvite.inviteCode
		m.groupInviteMessage.inviteExpiration = message.groupInvite.inviteExpiration
		m.groupInviteMessage.caption = message.groupInvite.text

		m.groupInviteMessage.groupJid = message.groupInvite.jid
		m.groupInviteMessage.groupName = message.groupInvite.subject
		//TODO: use built-in interface and get disappearing mode info etc.
		//TODO: cache / use store!?
		if (options.getProfilePicUrl) {
			const pfpUrl = await options.getProfilePicUrl(message.groupInvite.jid, 'preview')
			if (pfpUrl) {
				const resp = await axios.get(pfpUrl, { responseType: 'arraybuffer' })
				if (resp.status === 200) {
					m.groupInviteMessage.jpegThumbnail = resp.data
				}
			}
		}
	} else if ('pin' in message) {
		m.pinInChatMessage = {}
		m.messageContextInfo = {}

		m.pinInChatMessage.key = message.pin
		m.pinInChatMessage.type = message.type
		m.pinInChatMessage.senderTimestampMs = Date.now()

		m.messageContextInfo.messageAddOnDurationInSecs = message.type === 1 ? message.time || 86400 : 0
	} else if ('buttonReply' in message) {
		switch (message.type) {
			case 'template':
				m.templateButtonReplyMessage = {
					selectedDisplayText: message.buttonReply.displayText,
					selectedId: message.buttonReply.id,
					selectedIndex: message.buttonReply.index
				}
				break
			case 'plain':
				m.buttonsResponseMessage = {
					selectedButtonId: message.buttonReply.id,
					selectedDisplayText: message.buttonReply.displayText,
					type: proto.Message.ButtonsResponseMessage.Type.DISPLAY_TEXT
				}
				break
		}
	} else if ('ptv' in message && message.ptv) {
		const { videoMessage } = await prepareWAMessageMedia({ video: message.video }, options)
		m.ptvMessage = videoMessage
	} else if ('product' in message) {
		const { imageMessage } = await prepareWAMessageMedia({ image: message.product.productImage }, options)
		m.productMessage = WAProto.Message.ProductMessage.fromObject({
			...message,
			product: {
				...message.product,
				productImage: imageMessage
			}
		})
	} else if ('listReply' in message) {
		m.listResponseMessage = { ...message.listReply }
	} else if ('poll' in message) {
		message.poll.selectableCount ||= 0
		message.poll.toAnnouncementGroup ||= false

		if (!Array.isArray(message.poll.values)) {
			throw new Boom('Invalid poll values', { statusCode: 400 })
		}

		if (message.poll.selectableCount < 0 || message.poll.selectableCount > message.poll.values.length) {
			throw new Boom(`poll.selectableCount in poll should be >= 0 and <= ${message.poll.values.length}`, {
				statusCode: 400
			})
		}

		m.messageContextInfo = {
			// encKey
			messageSecret: message.poll.messageSecret || randomBytes(32)
		}

		const pollCreationMessage = {
			name: message.poll.name,
			selectableOptionsCount: message.poll.selectableCount,
			options: message.poll.values.map(optionName => ({ optionName }))
		}

		if (message.poll.toAnnouncementGroup) {
			// poll v2 is for community announcement groups (single select and multiple)
			m.pollCreationMessageV2 = pollCreationMessage
		} else {
			if (message.poll.selectableCount > 0) {
				//poll v3 is for single select polls
				m.pollCreationMessageV3 = pollCreationMessage
			} else {
				// poll v3 for multiple choice polls
				m.pollCreationMessage = pollCreationMessage
			}
		}
	} else if ('sharePhoneNumber' in message) {
		m.protocolMessage = {
			type: proto.Message.ProtocolMessage.Type.SHARE_PHONE_NUMBER
		}
	} else if ('requestPhoneNumber' in message) {
		m.requestPhoneNumberMessage = {}
	} else {
		m = await prepareWAMessageMedia(message, options)
	}

	if ('viewOnce' in message && !!message.viewOnce) {
		m = { viewOnceMessage: { message: m } }
	}

	if ('mentions' in message && message.mentions?.length) {
		const [messageType] = Object.keys(m)
		m[messageType].contextInfo = m[messageType] || {}
		m[messageType].contextInfo.mentionedJid = message.mentions
	}

	if ('edit' in message) {
		m = {
			protocolMessage: {
				key: message.edit,
				editedMessage: m,
				timestampMs: Date.now(),
				type: WAProto.Message.ProtocolMessage.Type.MESSAGE_EDIT
			}
		}
	}

	if ('contextInfo' in message && !!message.contextInfo) {
		const [messageType] = Object.keys(m)
		m[messageType] = m[messageType] || {}
		m[messageType].contextInfo = message.contextInfo
	}

	return WAProto.Message.fromObject(m)
}

export const generateWAMessageFromContent = (
	jid: string,
	message: WAMessageContent,
	options: MessageGenerationOptionsFromContent
) => {
	// set timestamp to now
	// if not specified
	if (!options.timestamp) {
		options.timestamp = new Date()
	}

	const innerMessage = normalizeMessageContent(message)!
	const key: string = getContentType(innerMessage)!
	const timestamp = unixTimestampSeconds(options.timestamp)
	const { quoted, userJid } = options

	if (quoted) {
		const participant = quoted.key.fromMe
			? userJid
			: quoted.participant || quoted.key.participant || quoted.key.remoteJid

		let quotedMsg = normalizeMessageContent(quoted.message)!
		const msgType = getContentType(quotedMsg)!
		// strip any redundant properties
		quotedMsg = proto.Message.fromObject({ [msgType]: quotedMsg[msgType] })

		const quotedContent = quotedMsg[msgType]
		if (typeof quotedContent === 'object' && quotedContent && 'contextInfo' in quotedContent) {
			delete quotedContent.contextInfo
		}

		const contextInfo: proto.IContextInfo = innerMessage[key].contextInfo || {}
		contextInfo.participant = jidNormalizedUser(participant!)
		contextInfo.stanzaId = quoted.key.id
		contextInfo.quotedMessage = quotedMsg

		// if a participant is quoted, then it must be a group
		// hence, remoteJid of group must also be entered
		if (jid !== quoted.key.remoteJid) {
			contextInfo.remoteJid = quoted.key.remoteJid
		}

		innerMessage[key].contextInfo = contextInfo
	}

	if (
		// if we want to send a disappearing message
		!!options?.ephemeralExpiration &&
		// and it's not a protocol message -- delete, toggle disappear message
		key !== 'protocolMessage' &&
		// already not converted to disappearing message
		key !== 'ephemeralMessage'
	) {
		innerMessage[key].contextInfo = {
			...(innerMessage[key].contextInfo || {}),
			expiration: options.ephemeralExpiration || WA_DEFAULT_EPHEMERAL
			//ephemeralSettingTimestamp: options.ephemeralOptions.eph_setting_ts?.toString()
		}
	}

	message = WAProto.Message.fromObject(message)

	const messageJSON = {
		key: {
			remoteJid: jid,
			fromMe: true,
			id: options?.messageId || generateMessageIDV2()
		},
		message: message,
		messageTimestamp: timestamp,
		messageStubParameters: [],
		participant: isJidGroup(jid) || isJidStatusBroadcast(jid) ? userJid : undefined,
		status: WAMessageStatus.PENDING
	}
	return WAProto.WebMessageInfo.fromObject(messageJSON)
}

export const generateWAMessage = async (jid: string, content: AnyMessageContent, options: MessageGenerationOptions) => {
	// ensure msg ID is with every log
	options.logger = options?.logger?.child({ msgId: options.messageId })
	return generateWAMessageFromContent(jid, await generateWAMessageContent(content, options), options)
}

/** Get the key to access the true type of content */
export const getContentType = (content: WAProto.IMessage | undefined) => {
	if (content) {
		const keys = Object.keys(content)
		const key = keys.find(k => (k === 'conversation' || k.includes('Message')) && k !== 'senderKeyDistributionMessage')
		return key as keyof typeof content
	}
}

/**
 * Normalizes ephemeral, view once messages to regular message content
 * Eg. image messages in ephemeral messages, in view once messages etc.
 * @param content
 * @returns
 */
export const normalizeMessageContent = (content: WAMessageContent | null | undefined): WAMessageContent | undefined => {
	if (!content) {
		return undefined
	}

	// set max iterations to prevent an infinite loop
	for (let i = 0; i < 5; i++) {
		const inner = getFutureProofMessage(content)
		if (!inner) {
			break
		}

		content = inner.message
	}

	return content!

	function getFutureProofMessage(message: typeof content) {
		return (
			message?.ephemeralMessage ||
			message?.viewOnceMessage ||
			message?.documentWithCaptionMessage ||
			message?.viewOnceMessageV2 ||
			message?.viewOnceMessageV2Extension ||
			message?.editedMessage
		)
	}
}

/**
 * Extract the true message content from a message
 * Eg. extracts the inner message from a disappearing message/view once message
 */
export const extractMessageContent = (content: WAMessageContent | undefined | null): WAMessageContent | undefined => {
	const extractFromTemplateMessage = (
		msg: proto.Message.TemplateMessage.IHydratedFourRowTemplate | proto.Message.IButtonsMessage
	) => {
		if (msg.imageMessage) {
			return { imageMessage: msg.imageMessage }
		} else if (msg.documentMessage) {
			return { documentMessage: msg.documentMessage }
		} else if (msg.videoMessage) {
			return { videoMessage: msg.videoMessage }
		} else if (msg.locationMessage) {
			return { locationMessage: msg.locationMessage }
		} else {
			return {
				conversation:
					'contentText' in msg ? msg.contentText : 'hydratedContentText' in msg ? msg.hydratedContentText : ''
			}
		}
	}

	content = normalizeMessageContent(content)

	if (content?.buttonsMessage) {
		return extractFromTemplateMessage(content.buttonsMessage)
	}

	if (content?.templateMessage?.hydratedFourRowTemplate) {
		return extractFromTemplateMessage(content?.templateMessage?.hydratedFourRowTemplate)
	}

	if (content?.templateMessage?.hydratedTemplate) {
		return extractFromTemplateMessage(content?.templateMessage?.hydratedTemplate)
	}

	if (content?.templateMessage?.fourRowTemplate) {
		return extractFromTemplateMessage(content?.templateMessage?.fourRowTemplate)
	}

	return content
}

/**
 * Returns the device predicted by message ID
 */
export const getDevice = (id: string) =>
	/^3A.{18}$/.test(id)
		? 'ios'
		: /^3E.{20}$/.test(id)
			? 'web'
			: /^(.{21}|.{32})$/.test(id)
				? 'android'
				: /^(3F|.{18}$)/.test(id)
					? 'desktop'
					: 'unknown'

/** Upserts a receipt in the message */
export const updateMessageWithReceipt = (msg: Pick<WAMessage, 'userReceipt'>, receipt: MessageUserReceipt) => {
	msg.userReceipt = msg.userReceipt || []
	const recp = msg.userReceipt.find(m => m.userJid === receipt.userJid)
	if (recp) {
		Object.assign(recp, receipt)
	} else {
		msg.userReceipt.push(receipt)
	}
}

/** Update the message with a new reaction */
export const updateMessageWithReaction = (msg: Pick<WAMessage, 'reactions'>, reaction: proto.IReaction) => {
	const authorID = getKeyAuthor(reaction.key)

	const reactions = (msg.reactions || []).filter(r => getKeyAuthor(r.key) !== authorID)
	if (reaction.text) {
		reactions.push(reaction)
	}

	msg.reactions = reactions
}

/** Update the message with a new poll update */
export const updateMessageWithPollUpdate = (msg: Pick<WAMessage, 'pollUpdates'>, update: proto.IPollUpdate) => {
	const authorID = getKeyAuthor(update.pollUpdateMessageKey)

	const reactions = (msg.pollUpdates || []).filter(r => getKeyAuthor(r.pollUpdateMessageKey) !== authorID)
	if (update.vote?.selectedOptions?.length) {
		reactions.push(update)
	}

	msg.pollUpdates = reactions
}

type VoteAggregation = {
	name: string
	voters: string[]
}

/**
 * Aggregates all poll updates in a poll.
 * @param msg the poll creation message
 * @param meId your jid
 * @returns A list of options & their voters
 */
export function getAggregateVotesInPollMessage(
	{ message, pollUpdates }: Pick<WAMessage, 'pollUpdates' | 'message'>,
	meId?: string
) {
	const opts =
		message?.pollCreationMessage?.options ||
		message?.pollCreationMessageV2?.options ||
		message?.pollCreationMessageV3?.options ||
		[]
	const voteHashMap = opts.reduce(
		(acc, opt) => {
			const hash = sha256(Buffer.from(opt.optionName || '')).toString()
			acc[hash] = {
				name: opt.optionName || '',
				voters: []
			}
			return acc
		},
		{} as { [_: string]: VoteAggregation }
	)

	for (const update of pollUpdates || []) {
		const { vote } = update
		if (!vote) {
			continue
		}

		for (const option of vote.selectedOptions || []) {
			const hash = option.toString()
			let data = voteHashMap[hash]
			if (!data) {
				voteHashMap[hash] = {
					name: 'Unknown',
					voters: []
				}
				data = voteHashMap[hash]
			}

			voteHashMap[hash].voters.push(getKeyAuthor(update.pollUpdateMessageKey, meId))
		}
	}

	return Object.values(voteHashMap)
}

/** Given a list of message keys, aggregates them by chat & sender. Useful for sending read receipts in bulk */
export const aggregateMessageKeysNotFromMe = (keys: proto.IMessageKey[]) => {
	const keyMap: { [id: string]: { jid: string; participant: string | undefined; messageIds: string[] } } = {}
	for (const { remoteJid, id, participant, fromMe } of keys) {
		if (!fromMe) {
			const uqKey = `${remoteJid}:${participant || ''}`
			if (!keyMap[uqKey]) {
				keyMap[uqKey] = {
					jid: remoteJid!,
					participant: participant!,
					messageIds: []
				}
			}

			keyMap[uqKey].messageIds.push(id!)
		}
	}

	return Object.values(keyMap)
}

type DownloadMediaMessageContext = {
	reuploadRequest: (msg: WAMessage) => Promise<WAMessage>
	logger: ILogger
}

const REUPLOAD_REQUIRED_STATUS = [410, 404]

/**
 * Downloads the given message. Throws an error if it's not a media message
 */
export const downloadMediaMessage = async <Type extends 'buffer' | 'stream'>(
	message: WAMessage,
	type: Type,
	options: MediaDownloadOptions,
	ctx?: DownloadMediaMessageContext
) => {
	const result = await downloadMsg().catch(async error => {
		if (
			ctx &&
			axios.isAxiosError(error) && // check if the message requires a reupload
			REUPLOAD_REQUIRED_STATUS.includes(error.response?.status!)
		) {
			ctx.logger.info({ key: message.key }, 'sending reupload media request...')
			// request reupload
			message = await ctx.reuploadRequest(message)
			const result = await downloadMsg()
			return result
		}

		throw error
	})

	return result as Type extends 'buffer' ? Buffer : Transform

	async function downloadMsg() {
		const mContent = extractMessageContent(message.message)
		if (!mContent) {
			throw new Boom('No message present', { statusCode: 400, data: message })
		}

		const contentType = getContentType(mContent)
		let mediaType = contentType?.replace('Message', '') as MediaType
		const media = mContent[contentType!]

		if (!media || typeof media !== 'object' || (!('url' in media) && !('thumbnailDirectPath' in media))) {
			throw new Boom(`"${contentType}" message is not a media message`)
		}

		let download: DownloadableMessage
		if ('thumbnailDirectPath' in media && !('url' in media)) {
			download = {
				directPath: media.thumbnailDirectPath,
				mediaKey: media.mediaKey
			}
			mediaType = 'thumbnail-link'
		} else {
			download = media
		}

		const stream = await downloadContentFromMessage(download, mediaType, options)
		if (type === 'buffer') {
			const bufferArray: Buffer[] = []
			for await (const chunk of stream) {
				bufferArray.push(chunk)
			}

			return Buffer.concat(bufferArray)
		}

		return stream
	}
}

/** Checks whether the given message is a media message; if it is returns the inner content */
export const assertMediaContent = (content: proto.IMessage | null | undefined) => {
	content = extractMessageContent(content)
	const mediaContent =
		content?.documentMessage ||
		content?.imageMessage ||
		content?.videoMessage ||
		content?.audioMessage ||
		content?.stickerMessage
	if (!mediaContent) {
		throw new Boom('given message is not a media message', { statusCode: 400, data: content })
	}

	return mediaContent
}