#!/bin/bash

EARLIEST_MOD_WEEK="$(date "+%V" --date="14 days ago")"
EARLIEST_MOD_WEEK="${EARLIEST_MOD_WEEK#0}"
typeset -A WEEKS

if [[ -t 0 ]]; then
	times="$(xclip -sel c -o)"
else
	times="$(cat)"
fi
times="$(<<<"$times" grep $'\t' | tail -n +2)"
YEAR="$(tail -2 <<<"$times" | head -1 | grep -Eo "[0-9]{4}" | head -1)"

# get relevant parts, format to ISO 8601'ish format and calculate difference
IFS=$'\n'
for line in $times; do
	# gather times
	times="$(<<<"$line" \
		grep -Eo $'[0-9. \t:]{18}' \
		| sed -E 's/.(..)\.(..)\.(.{4}) \t(.*)/\3-\2-\1 \4/'
	)"

	end="$(<<<"$times" tail -1)"
	# check for valid end date & time in this year
	[[ $end ]] && [[ $end != $'\t' ]] || continue
	[[ ${end%%-*} = $YEAR ]] || continue

	start="$(<<<"$times" head -1)"

	# convert to UNIX timestamp
	end="$(date --date="$end" "+%s")"
	start="$(date --date="$start" "+%s")"

	diff=$((end - start))
	# subtract pauses
	(( diff <= 32400 )) || : $((diff -= 900))
	(( diff <= 21600 )) || : $((diff -= 1800))

	# sum the hours in the same week
	week=$(date "+%V" --date="@$start")
	: $((WEEKS[$week] += $diff))
done

# print
for week in "${!WEEKS[@]}"; do
	time="${WEEKS[$week]}"
	hrs=$(( time / 60 / 60 ))
	mins=$(( (time % (60 * 60)) / 60 ))

	# last 2 weeks are modifiable
	week="${week#0}"
	(( week >= EARLIEST_MOD_WEEK )) && modifiable="*" || modifiable=" "
	# 20h limit
	(( time <= 72000 )) && warn= || warn=" !!"

	printf "%s%s %02d:%02d%s\n" "$week" "$modifiable" "$hrs" "$mins" "$warn"
done | sort