#!/bin/sh

set -e

get_duration() {
	ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$1" | awk '{print int($1+0.5)}'
}

[ -z "$1" ] && {
	echo "usage: $0 FILENAME [FILENAME ...]"
	echo "   or: $0 *.mp4"
	exit 1
}

total=0
while [ $# -gt 0 ]; do
	if [ -f "$1" ]; then
		dur=$(get_duration "$1")
		total=$(( total+dur ))
	else
		>&2 echo "error: $1: no such file"
		exit 1
	fi
	shift
done

echo "$total seconds"

days=$(( total / 86400 ))
if [ $days -gt 0 ]; then
	echo -n "${days}d "
fi

human="$(date -d@$total -u +%H:%M:%S)"
echo "$human"