#!/bin/bash
TELEGRAM_TOKEN=""
PARSE_MODE="MarkdownV2"

# tg_send(chat, text, file, type)
function tg_send_message() {
	if [[ $3 != '' ]]; then
		local type_snake=$4
		[[ $4 == '' ]] && local type_snake='document'
		[[ $4 == '' || $4 == 'document' ]] && local type="Document"
		[[ $4 == 'photo' ]] && local type="Photo"
		[[ $4 == 'audio' ]] && local type="Audio"
		[[ $4 == 'video' ]] && local type="Video"
		[[ $4 == 'animation' ]] && local type="Animation"
		[[ $4 == 'voice' ]] && local type="Voice"
		[[ $4 == 'video_note' ]] && local type="VideoNote"
		
		curl -s
			 -F chat_id=$1 \
			 -F caption="$2" \
			 -F parse_mode=$PARSE_MODE \
		 	 -F $type_snake=@$3 \
		 	 "https://api.telegram.org/bot${TELEGRAM_TOKEN}/send${type}"
	else
		curl -s
			 -F chat_id=$1 \
			 -F text="$2" \
			 -F parse_mode=$PARSE_MODE \
			 "https://api.telegram.org/bot${TELEGRAM_TOKEN}/sendMessage"
	fi
}

# tg_get_me()
function tg_get_me() {
	curl -s "https://api.telegram.org/bot${TELEGRAM_TOKEN}/getMe"
}

# tg_get_messages(offset, timeout)
function _tg_get_updates() {
	curl -s "https://api.telegram.org/bot${TELEGRAM_TOKEN}/getUpdates?offset=$1&timeout=$2" | jq -c '.result[]'
}

function _on_msg() {	
	echo "[msg] ${event[from_username]}: ${event[text]}"
}

function _on_edit() {
	echo "[edit] ${event[json]}"
}

function _on_animation() {
	echo "[animation] ${event[json]}"
}

function _on_audio() {
	echo "[audio] ${event[json]}"
}

function _on_document() {
	echo "[document] ${event[json]}"
}

function _on_photo() {
	echo "[photo] ${event[json]}"
}

function _on_sticker() {
	echo "[sticker] ${event[json]}"
}

function _on_video() {
	echo "[video] ${event[json]}"
}

function _on_video_note() {
	echo "[video_note] ${event[json]}"
}

function _on_voice() {
	echo "[voice] ${event[json]}"
}


_offset=0
while true; do
	IFS=$'\n'
	_events=($(_tg_get_updates $_offset 10))
	unset IFS
	
	for (( i=0; i<${#_events[@]}; i++ )); do
		_msg_type="$(jq -r '(select(.message) | "message"), (select(.edited_message) | "edited_message")' <<< "${_events[$i]}")"
		_event_type="$(jq -r '(select(.message) | .message), (select(.edited_message) | .edited_message) | (
			(select(.animation) | "animation"),
			(select(.audio) | "audio"),
			(select(.document) | "document"),
			(select(.photo) | "photo"),
			(select(.sticker) | "sticker"),
			(select(.video) | "video"),
			(select(.video_note) | "video_note"),
			(select(.voice) | "voice"))' <<< "${_events[$i]}")"
			
		declare -A event
		event[type]="$_msg_type"
		event[json]="${_events[$i]}"
		if [[ "$_msg_type" == edited_message ]]; then
			_on_edit
		elif [[ "$_event_type" == animation ]]; then
			_on_animation
		elif [[ "$_event_type" == audio ]]; then
			_on_audio
		elif [[ "$_event_type" == document ]]; then
			_on_document
		elif [[ "$_event_type" == photo ]]; then
			_on_photo
		elif [[ "$_event_type" == sticker ]]; then
			_on_sticker
		elif [[ "$_event_type" == video ]]; then
			_on_video
		elif [[ "$_event_type" == video_note ]]; then
			_on_video_note
		elif [[ "$_event_type" == voice ]]; then
			_on_voice
		else
			declare -a "_tmp=($(jq -r '.message |
				[.message_id,
				.from.id,
				.from.is_bot,
				.from.first_name,
				.from.last_name,
				.from.username,
				.chat.id,
				(if .chat.type == "private" then .chat.username else .chat.title end),
				.chat.type,
				.date,
				.text] 
				| @sh' <<< "${_events[$i]}" | sed 's/[][`~!@#$%^&*():;<>.,?/\|{}=+-]/\\&/g' ))"
			event[message_id]="${_tmp[0]}"
			event[from_id]="${_tmp[1]}"
			event[from_is_bot]="${_tmp[2]}"
			event[from_first_name]="${_tmp[3]}"
			event[from_last_name]="${_tmp[4]}"
			event[from_username]="${_tmp[5]}"
			event[chat_id]="${_tmp[6]}"
			event[chat_title]="${_tmp[7]}"
			event[chat_type]="${_tmp[8]}"
			event[date]="${_tmp[9]}"
			event[text]="${_tmp[10]}"
			_on_msg 
		fi
		unset event
	done
	[[ ${#_events[@]} -gt 0 ]] && _update_id=$(jq 'select(.update_id != null) | .update_id' <<< "${_events[-1]}")
	[[ $_update_id != '' ]] && _offset=$((_update_id+1))
	echo $_offset
done