#! /usr/bin/env bash

# User input
sender=typebrook@gmail.com
receiver=typebrook@gmail.com
gapp=$(pass google/imap_for_typebrook)
sub="$(date) test mail from curl"
body="$(echo -e 'just\na\ntest\nmail')"

# check for provided attachment file as a positional parameter
# -z indicating an empty positional parameter
# attachment doesn't exist condition
if [ -z "$1" ]; then

	# curl command for accessing the smtp server

	curl -s --url 'smtps://smtp.gmail.com:465' --ssl-reqd \
		--mail-from $sender \
		--mail-rcpt $receiver --user $sender:$gapp \
		-T <(echo -e "From: ${sender}
To: ${receiver}
Subject: ${sub}

 ${body}")

# attachment exists condition
else
	file="$1" # set file as the 1st positional parameter

	# MIME type for multiple type of input file extensions
	MIMEType=$(file --mime-type "$file" | sed 's/.*: //')
	curl -s --url 'smtps://smtp.gmail.com:465' --ssl-reqd \
		--mail-from $sender \
		--mail-rcpt $receiver --user $sender:$gapp \
		-H "Subject: $sub" -H "From: $sender" -H "To: $receiver" -F \
		'=(;type=multipart/mixed' -F "=$body;type=text/plain" -F \
		"file=@$file;type=$MIMEType;encoder=base64" -F '=)'
fi