#!/usr/bin/env bash
set -euxo pipefail

usage () {
  echo "Recursively imports all gpx tracks in a directory into an SQLite database."
  echo ""
  echo "Usage: $(basename $0) directory target-database"
}

gpx_directory="$1"
target_database="$2"

# basic argument verification
case "$@" in -h|--help) usage && exit 0;; esac
[ -z "$gpx_directory" ] && usage && exit 1
[ -z "$target_database" ] && usage && exit 1

# we write to a temporary location to make the replace option atomic (if on the same device)
tmp_dir="$(mktemp -d diogenes.XXXXX -p /tmp)"
tmp="$tmp_dir/$(basename $target_database)"

# recursive scan and import
while IFS= read -d '' -r file; do
  spatialite_xml_load -d "$tmp" -x "$file"
done < <(find "$gpx_directory" -name '*.gpx' -print0)

mv -f "$tmp" "$target_database"
rm -rf "$tmp_dir"

# TODO: Create virtual joined table