#!/bin/bash
set -e

cd /home/slin/enduro-trails/data/srtm

echo 'Missing files to download:'
for lat in 54 55 56; do
  for lon in 041 042 043 044 045 046; do
    f="N${lat}E${lon}.hgt"
    if [ ! -f "$f" ]; then
      echo "  $f"
    fi
  done
done

echo ''
echo 'Downloading missing...'
for lat in 54 55 56; do
  for lon in 041 042 043 044 045 046; do
    f="N${lat}E${lon}"
    if [ ! -f "${f}.hgt" ]; then
      wget -q "https://firmware.ardupilot.org/SRTM/ap_srtm3/${f}.hgt.zip" -O "/tmp/${f}.hgt.zip" 2>/dev/null
      if [ -s "/tmp/${f}.hgt.zip" ]; then
        unzip -o -q "/tmp/${f}.hgt.zip" -d . 2>/dev/null && echo "  OK: ${f}" || echo "  UNZIP FAIL: ${f}"
        rm -f "/tmp/${f}.hgt.zip"
      else
        echo "  NOT FOUND on ardupilot: ${f}"
        rm -f "/tmp/${f}.hgt.zip"
      fi
    else
      echo "  EXISTS: ${f}"
    fi
  done
done

echo ''
echo 'Total HGT files now:'
ls *.hgt | wc -l