#!/bin/sh

# Hook for Taskwarrior to automaticaly sync.
# If the state has been modified, we fork into the background
# and run task sync. If the command fails, then we spawn an
# urgent desktop notification, and use sendmail to send ourselves
# an email with an error log. For this to work, sendmail must
# be configured with capability to send emails from our account.

DATA="$HOME/.local/share/task"

n=0
while IFS= read -r _; do
    n=$((n + 1))
done

if [ "$n" -gt 0 ]; then
    {
        lockfile="$DATA/sync_hook.lock"
        errfile="$DATA/sync_hook.err"
        lerrfile="$DATA/sync_hook.errl"
        logfile="$DATA/sync_hook.log"
        address='daniel@ficd.ca'

        # shellcheck disable=SC2016
        flock "$lockfile" sh -c '
            task sync >>"$1" 2>"$2"
            status=$?
            if [ "$status" -ne 0 ]; then
                echo "Taskwarrior sync failed at $(date)" >>"$2"

                if command -v sendmail >/dev/null 2>&1; then
                    {
                        echo "To: $5"
                        echo "From: $5"
                        echo "Subject: Taskwarrior Sync Failed on $(hostname)"
                        echo "Date: $(date -R)"
                        echo ""
                        echo "task sync failed at $(date)"
                        echo ""
                        cat "$2"
                    } | sendmail -t
                fi

                cat "$2" >>"$3"

                if command -v notify-send >/dev/null 2>&1; then
                    notify-send --urgency=critical "taskwarrior sync failed"
                fi

                exit 1
            fi
        ' sh "$logfile" "$lerrfile" "$errfile" "$(hostname)" "$address"
    } >/dev/null 2>&1 </dev/null &
fi

exit 0