#!/usr/bin/env bash
# shellcheck disable=SC1090,SC1091

# set -xv
EUMETSAT_KEY="jdBM1PsDQUm0tCZfk9VXD6IaJoUa"
EUMETSAT_SECRET="SumkiqFMU3MAGpt_azb1KXKgjdMa"
URL="https://api.eumetsat.int/data"
COL_ID="EO%3AEUM%3ADAT%3A0665"

ping -c1 1.1.1.1 >>/dev/null || error "couldn't establish an internet connection!"

# acquire the output directory
if command -v xdg-user-dir; then
	outdir="$(xdg-user-dir PICTURES)/eumetsat"
elif [ -z "$HOME" ]; then
	outdir="$HOME/.eumetsat"
else
	error "couldn't connect to either 'xdg-user-dir PICTURES' or '\$HOME'"
fi

# acquire the API key
EUMETSAT_API=$(
	curl -k -d "grant_type=client_credentials" \
		-H "Authorization: Basic $(printf "%s:%s" "$EUMETSAT_KEY" "$EUMETSAT_SECRET" | base64)" \
		https://api.eumetsat.int/token | jq -r '.["access_token"]'
)

error() {
	printf "\033[31m%s\033[0m\n" "$1"
	exit 1
}

apireq() {
	curl -k -H "Authorization: Bearer $EUMETSAT_API" "$URL/$1" "${@:2}"
}

DATE="$(date -u +'%Y/%m/%d')"
product=$(
	apireq "browse/collections/$COL_ID/dates/$DATE/products?format=json" |
		jq -r '.["products"].[0].["id"] | @uri'
)

[ -z "$product" ] && error "was unable to locate the latest product!"

mkdir -p "$outdir"
apireq "download/1.0.0/collections/$COL_ID/products/$product/browse" -o "$outdir/tmp.jpeg" || error "failed to download!"
mv -f "$outdir/tmp.jpeg" "$outdir/curr.jpeg"

# negate since default is rubbish
ffmpeg -y -i photos/eumetsat/curr.jpeg -vf negate photos/eumetsat/curr.jpeg

# update the feh background
. "$HOME/.fehbg"