#!/bin/sh

# Writes files to the current working directory

PYTHON="$(dirname "$0")"/venv/bin/python
if ! test -x "$PYTHON"; then
	echo "Create a virtual environment in $(dirname "$0")/venv first"
	exit 1
fi

previous_file=""

while true; do
	# Get one shot of data
	data="$("$PYTHON" "$(dirname "$0")"/trainmap_backup.py)"

	timestamp="$(printf '%s\n' "$data" | jq ".timestamp / 1000 | round")"
	file="$(date +%Y-%m-%d --date "@$timestamp").json"

	# Write the data to file
	printf '%s\n' "$data" >> "$file"

	# At the start of a new day, archive the previous day's file
	if test "$previous_file" == ""; then
		previous_file="$file"
	elif test "$file" != "$previous_file" && test "$file" != ""; then
		gzip --best "$previous_file"
		previous_file="$file"
	fi

	# Sleep to start the next request at the next full minute
	seconds="$(date +%S)"
	sleep_for="$("$PYTHON" -c "print(60 - int('$seconds', 10) - 0.5)")"
	sleep "$sleep_for" || true
done