#!/bin/bash
if [[ $# -ne 2 || "$1" == '--help' ]]
then
	echo "Usage: $0 PROJECT DURATION" >&2
	echo 'Requests the PROJECT statistics from the AT tracker twice DURATION seconds apart, and calculates the average returned item size for each user within that window.' >&2
	echo 'Output consists of lines of username SPACE SIZE, sorted by size ascending.' >&2
	exit 1
fi

project="$1"
declare -i duration="$2"

{
	curl -s "https://legacy-api.arpa.li/${project}/stats.json" | tr -d '\n'
	echo

	sleep ${duration}

	curl -s "https://legacy-api.arpa.li/${project}/stats.json" | tr -d '\n'
	echo
} \
| python3 -c 'import json,sys;o0=json.loads(sys.stdin.readline());o1=json.loads(sys.stdin.readline());[print(k,(o1["downloader_bytes"][k]-o0["downloader_bytes"][k])/(o1["downloader_count"][k]-o0["downloader_count"][k])) for k in o0["downloaders"] if o1["downloader_count"][k] != o0["downloader_count"][k]]' \
| sort -k2,2n