#!/bin/sh
set -e

REGION="${OSRM_REGION:-connecticut-latest}"
PBF="/data/${REGION}.osm.pbf"
URL="https://download.geofabrik.de/north-america/us/${REGION}.osm.pbf"
MIN_BYTES=10000000  # 10 MB — a valid PBF is always larger than this

# Check if a complete file already exists
if [ -f "$PBF" ]; then
    SIZE=$(wc -c < "$PBF")
    if [ "$SIZE" -gt "$MIN_BYTES" ]; then
        echo "[osrm-download] Map data already present ($(( SIZE / 1024 / 1024 )) MB), skipping download."
        exit 0
    else
        echo "[osrm-download] Existing file is too small (${SIZE} bytes), re-downloading..."
        rm -f "$PBF"
    fi
fi

echo "[osrm-download] Downloading ${REGION} map data from Geofabrik..."
curl --fail -L --progress-bar -o "$PBF" "$URL" || { rm -f "$PBF"; echo "[osrm-download] Download failed."; exit 1; }

SIZE=$(wc -c < "$PBF")
echo "[osrm-download] Download complete ($(( SIZE / 1024 / 1024 )) MB)."