#!/usr/bin/env sh
# Sync mail and give notification if there is new mail.

export PATH=$PATH:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$(id -u)/bus
export DBUS_SESSION_BUS_ADDRESS
export DISPLAY=:0.0
[ -d "$HOME/.local/share/password-store" ] && export PASSWORD_STORE_DIR="$HOME/.local/share/password-store"

# Run only if user logged in (prevent cron errors)
pgrep -u "${USER:=$LOGNAME}" >/dev/null || { echo "$USER not logged in; sync will not run."; exit ;}
# Run only if not already running in other instance
pgrep -x mbsync >/dev/null && { echo "mbsync is already running." ; exit ;}

# Checks for internet connection and set notification script.
ping -q -c 1 1.1.1.1 > /dev/null || { echo "No internet connection detected."; exit ;}
command -v notify-send >/dev/null || echo "Note that \`libnotify\` or \`libnotify-send\` should be installed for pop-up mail notifications with this script."

# Settings are different for MacOS (Darwin) systems.
if [ "$(uname)" = "Darwin" ]; then
    notify() { osascript -e "display notification \"$2 in $1\" with title \"You've got Mail\" subtitle \"Account: $account\"" && sleep 2 ;}
else
    notify() { notify-send "mutt-wizard" "📬 $2 new mail(s) in \`$1\` account." ;}
fi

# Check account for new mail. Notify if there is new content.
syncandnotify() {
    acc="$(echo "$account" | sed "s/.*\///")"
    mbsync "$acc"
    new=$(find "$HOME/.local/share/mail/$acc/INBOX/new/" "$HOME/.local/share/mail/$acc/Inbox/new/" "$HOME/.local/share/mail/$acc/inbox/new/" -type f -newer "$HOME/.config/mutt/.mailsynclastrun" 2> /dev/null)
    newcount=$(echo "$new" | sed '/^\s*$/d' | wc -l)
    if [ "$newcount" -gt "0" ]; then
        notify "$acc" "$newcount" &
        for file in $new; do
            # Extract subject and sender from mail.
            from=$(awk '/^From: / && ++n ==1,/^\<.*\>:/' "$file" | perl -CS -MEncode -ne 'print decode("MIME-Header", $_)' | awk '{ $1=""; if (NF>=3)$NF=""; print $0 }' | sed 's/^[[:blank:]]*[\"'\''\<]*//;s/[\"'\''\>]*[[:blank:]]*$//')
            subject=$(awk '/^Subject: / && ++n == 1,/^\<.*\>: / && ++i == 2' "$file" | head -n-1 | perl -CS -MEncode -ne 'print decode("MIME-Header", $_)' | sed 's/^Subject: //' | sed 's/^{[[:blank:]]*[\"'\''\<]*//;s/[\"'\''\>]*[[:blank:]]*$//' | tr -d '\n')
            notify-send "📧$from:" "$subject" &
        done
    fi
}

# Sync accounts passed as argument or all.
if [ "$#" -eq "0" ]; then
    accounts="$(awk '/^Channel/ {print $2}' "$HOME/.mbsyncrc")"
else
    accounts=$*
fi

echo " 🔃" > /tmp/imapsyncicon_"$USER"
pkill -RTMIN+12 i3blocks >/dev/null 2>&1

# Parallelize multiple accounts
for account in $accounts
do
    syncandnotify &
done

wait
rm -f /tmp/imapsyncicon_"$USER"
pkill -RTMIN+12 i3blocks >/dev/null 2>&1

notmuch new 2>/dev/null

#Create a touch file that indicates the time of the last run of mailsync
touch "$HOME/.config/mutt/.mailsynclastrun"