#!/bin/bash
set -e

cd /home/slin/enduro-trails/data/srtm
BASE="https://srtm.kurviger.de/SRTM3/Eurasia"

echo 'Downloading from kurviger mirror...'
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
      echo "  EXISTS: ${f}"
      continue
    fi
    wget -q --timeout=60 "${BASE}/${f}.hgt.zip" -O "/tmp/${f}.hgt.zip" 2>/dev/null
    if [ -s "/tmp/${f}.hgt.zip" ]; then
      unzip -o -q "/tmp/${f}.hgt.zip" -d . && echo "  OK: ${f} ($(du -h ${f}.hgt | cut -f1))" || echo "  UNZIP FAIL: ${f}"
      rm -f "/tmp/${f}.hgt.zip"
    else
      echo "  NOT FOUND: ${f}"
      rm -f "/tmp/${f}.hgt.zip"
    fi
  done
done

echo ''
echo "Total HGT: $(ls *.hgt | wc -l)"
echo "New E041-E046 (N54-56):"
ls N5[456]E04[1-6].hgt 2>/dev/null | sort