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#!/bin/sh
set -e
[ -n "$DEBUG" ] && { set -x; curl_args='-v'; }
# check requirements
for tool in awk curl jq flock; do
if ! command -v "$tool" >/dev/null; then
printf "%s: %s not installed but required\n" "$(basename "$0")" "$tool" >&2
exit 1
fi
done
# incidence = (sumCasesLast7Days / EWZ) * 100000
lat=${HOME_LAT:?}
lon=${HOME_LAT:?}
fields='GEN,RS,EWZ,EWZ_BL,BL_ID,cases,cases_per_100k,cases7_per_100k,cases7_bl_per_100k,last_update,BL,IBZ'
# see https://experience.arcgis.com/experience/478220a4c454480e823b17327b2bf1d4
uri="https://services7.arcgis.com/mOBPykOjAyBO2ZKk/arcgis/rest/services/RKI_Landkreisdaten/FeatureServer/0/query?where=1%3D1&outFields=${fields}&geometry=${lon}%2C${lat}&geometryType=esriGeometryPoint&inSR=4326&spatialRel=esriSpatialRelWithin&returnGeometry=false&outSR=4326&f=json"
_data=$(curl -sSL -H 'Accept: application/json' ${curl_args} ${uri} | jq -r '.features[0].attributes')
[ -z "${_data}" ] && printf "{}\n"
HISTFILE=${HOME}/covid-history.csv
loc=$(printf "${_data}" | jq -r '.GEN')
last_update=$(printf "${_data}" | jq -r '.last_update')
# printf "${_data}" | jq -r '.'
incidence_f=$(printf "%.1f" $(printf "${_data}" | jq -r '.cases7_bl_per_100k'))
incidence_i=$(printf "%.0f" "${incidence_f}")
# store
tmp_HISTFILE=$(mktemp -u --tmpdir waybar-module-covid.XXXXX)
(
cat ${HISTFILE}
ts=$(printf "${last_update}" | cut -d',' -f1 | tr '.' '-')
printf "%s,%s\n" "${ts}" "${incidence_f}"
) | uniq | tee ${tmp_HISTFILE} >/dev/null
flock -x ${HISTFILE} mv ${tmp_HISTFILE} ${HISTFILE}
mxy=$(awk -F',' '{y=y+$2} END{print ((NR*(NR+1))/2)/NR, y/NR}' "${HISTFILE}")
trend=$(awk -F',' --assign="mx=$(printf "$mxy" | cut -d' ' -f1)" --assign="my=$(printf "$mxy" | cut -d' ' -f2)" '{up= up+(NR-mx)*($2-my); down= down+(NR-mx)**2} END{if(down==0){print 0}else{print up/down};}' "${HISTFILE}")
trend_arrow=""
[ $(printf "%.0f" ${trend}) -gt 0 ] && trend_arrow=""
[ $(printf "%.0f" ${trend}) -lt 0 ] && trend_arrow=""
color='green'
if [ "${incidence_i}" -eq "0" ]; then
color='gray'
fi
if [ "${incidence_i}" -gt "1" ]; then
color='green'
fi
if [ "${incidence_i}" -gt "25" ]; then
color='yellow'
fi
if [ "${incidence_i}" -gt "35" ]; then
color='orange'
fi
if [ "${incidence_i}" -gt "50" ]; then
color='red'
fi
if [ "${incidence_i}" -gt "100" ]; then
color='darkred'
fi
if [ "${incidence_i}" -gt "250" ]; then
color='darkdarkred'
fi
jq -nr \
"{ text: \"${trend_arrow}${incidence_f}\", percentage: \"${incidence_i}\", class: \"${color}\", alt: \"${color}\",
tooltip: \"7 Tage Inzidenz für \\n${loc}\\nLast update: ${last_update}\" } | @text"
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