#!/usr/bin/env bash

# exit if a command fails
set -o errexit

# exit if required variables are not set
set -o nounset

# subshells and functions inherit ERR traps
set -E

# commands required for script execution
required_commands="/home/sinc/bin/grafana-snapshots.sh"
missing_counter=0
for command in ${required_commands}; do
  if ! hash "${command}" >/dev/null 2>&1; then
    printf "Command not found in PATH: %s\n" "${command}" >&2
    ((missing_counter++))
  fi
done
if ((missing_counter > 0)); then
  printf "%d or more commands are missing from PATH. Exiting.\n" "${missing_counter}" >&2
  exit 1
fi

# set output path
if [ "$(hostname)" == "crimson" ]; then
  output_path="/var/www/html/snapshots.grafana.seedno.de"
elif [ "$(hostname)" == "casa" ]; then
  output_path="/home/sinc/media/html/snapshots.grafana.home.seedno.de"
else
  echo "Unknown grafana host."
  exit 1
fi

# create temporary directory for generating montages
temp_dir="$(mktemp -d)"

# run on exit
function cleanup {
  # remove temp directory
  rm -rf "${temp_dir}"
}
trap cleanup EXIT

# generate renders for network receiving
echo "Rendering images for network receiving..."
/home/sinc/bin/grafana-snapshots.sh "${output_path}/network-receiving-last-1h.png" "6" "now-1h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/network-receiving-last-3h.png" "6" "now-3h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/network-receiving-last-6h.png" "6" "now-6h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/network-receiving-last-12h.png" "6" "now-12h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/network-receiving-last-24h.png" "6" "now-24h" "now"

# generate renders for network sending
echo "Rendering images for network sending..."
/home/sinc/bin/grafana-snapshots.sh "${output_path}/network-sending-last-1h.png" "8" "now-1h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/network-sending-last-3h.png" "8" "now-3h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/network-sending-last-6h.png" "8" "now-6h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/network-sending-last-12h.png" "8" "now-12h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/network-sending-last-24h.png" "8" "now-24h" "now"

# generate renders for country receiving
echo "Rendering images for country receiving..."
/home/sinc/bin/grafana-snapshots.sh "${output_path}/country-receiving-last-1h.png" "4" "now-1h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/country-receiving-last-3h.png" "4" "now-3h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/country-receiving-last-6h.png" "4" "now-6h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/country-receiving-last-12h.png" "4" "now-12h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/country-receiving-last-24h.png" "4" "now-24h" "now"

# generate renders for country sending
echo "Rendering images for country sending..."
/home/sinc/bin/grafana-snapshots.sh "${output_path}/country-sending-last-1h.png" "2" "now-1h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/country-sending-last-3h.png" "2" "now-3h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/country-sending-last-6h.png" "2" "now-6h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/country-sending-last-12h.png" "2" "now-12h" "now"
/home/sinc/bin/grafana-snapshots.sh "${output_path}/country-sending-last-24h.png" "2" "now-24h" "now"

# create combined images
times=(1h 3h 6h 12h 24h)
for time in "${times[@]}"; do
  echo "Compositing images for last ${time}..."
  convert +append "${output_path}/network-sending-last-${time}.png" "${output_path}/network-receiving-last-${time}.png" "${temp_dir}/network.png"
  convert +append "${output_path}/country-sending-last-${time}.png" "${output_path}/country-receiving-last-${time}.png" "${temp_dir}/country.png"
  convert -append "${temp_dir}/network.png" "${temp_dir}/country.png" "${output_path}/combined-last-${time}.png"
done