#!/usr/bin/env bash
# The join step of backcountry-osm/build-all (docs/backcountry/PLAN.md B2.2a), in the geotools image (no database): the
# regions' backcountry-osm archives → one /data/tiles/backcountry-osm.pmtiles with tile-join, every layer and zoom kept
# (-pk: no tile size limit), stamped with the ODbL notice, the 4.6 offer and the oldest extract date. Only
# backcountry-osm archives go in: the result stays one ODbL tileset.
#
#   tools/geodata/run backcountry-osm/join /data/build/backcountry-osm-all/minnesota.pmtiles /data/build/backcountry-osm-all/ontario.pmtiles
set -euo pipefail
HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
log() { printf '\033[1;32m==>\033[0m %s\n' "$*"; }
die() { printf '\033[1;31merror:\033[0m %s\n' "$*" >&2; exit 1; }
[[ $# -ge 1 ]] || die "usage: backcountry-osm/join <region.pmtiles>…"

oldest=""
for f in "$@"; do
  [[ -f "$f" ]] || die "no archive at $f"
  meta="$(python3 -I "$HERE/../lib/pmtiles_meta.py" show "$f")"
  python3 -I -c 'import json, sys; m = json.load(sys.stdin)
sys.exit(0 if m.get("dataset") == "backcountry-osm" else "%s is not a backcountry-osm archive" % sys.argv[1])' "$f" <<<"$meta"
  v="$(python3 -I -c 'import json, sys; print(json.load(sys.stdin).get("source_version", ""))' <<<"$meta")"
  [[ -z "$oldest" || "$v" < "$oldest" ]] && oldest="$v"
done
BUILD_DIR="${HG_BUILD_DIR:-/tmp/hg-build}/backcountry-osm-join"
rm -rf "$BUILD_DIR" && mkdir -p "$BUILD_DIR"
# Docker Desktop bind mounts can fail tile-join on big inputs (docs/10 §4c): read copies on the container's own disk.
local_inputs=()
for f in "$@"; do cp "$f" "$BUILD_DIR/in-${#local_inputs[@]}.pmtiles"; local_inputs+=("$BUILD_DIR/in-${#local_inputs[@]}.pmtiles"); done
tile-join -o "$BUILD_DIR/backcountry-osm.pmtiles" -f -q -pk -n "HuntGrid Backcountry OSM" \
  -A '<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>' "${local_inputs[@]}"
python3 "$HERE/../lib/pmtiles_meta.py" odbl "$BUILD_DIR/backcountry-osm.pmtiles" backcountry-osm "$oldest"
mkdir -p /data/tiles
cp "$BUILD_DIR/backcountry-osm.pmtiles" /data/tiles/.backcountry-osm.pmtiles.part
mv -f /data/tiles/.backcountry-osm.pmtiles.part /data/tiles/backcountry-osm.pmtiles
rm -rf "$BUILD_DIR"
log "Joined $# regions into /data/tiles/backcountry-osm.pmtiles ($oldest)"