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

if [ "$#" -ne 1 ]; then
    echo "usage: $0 DE_VG250.gpkg"
    exit 1
fi

INPUT="$1"

if [ ! -f "$INPUT" ]; then
    echo "file not found: $INPUT"
    exit 1
fi

: "${DATABASE_URL:?DATABASE_URL must be set}"

echo "Available layers:"
ogrinfo "$INPUT" | sed -n '1,80p'

echo
echo "Importing vg250_krs..."

ogr2ogr \
    -f PostgreSQL \
    "$DATABASE_URL" \
    "$INPUT" \
    -nln vg250_krs_import \
    -nlt PROMOTE_TO_MULTI \
    -t_srs EPSG:4326 \
    -overwrite

echo "Import completed."

psql "$DATABASE_URL" <<'SQL'
TRUNCATE county_boundaries RESTART IDENTITY;

INSERT INTO county_boundaries (
    name,
    geometry
)
SELECT
    COALESCE(
        NULLIF("GEN", ''),
        NULLIF("BEZ", ''),
        NULLIF("ARS", ''),
        'unknown'
    ) AS name,

    ST_Multi(
        ST_CollectionExtract(
            ST_MakeValid(wkb_geometry),
            3
        )
    )::geometry(MultiPolygon,4326)

FROM vg250_krs_import

WHERE wkb_geometry IS NOT NULL;

DROP TABLE vg250_krs_import;

CREATE INDEX county_boundaries_geometry_idx
    ON county_boundaries
    USING GIST (geometry);

ANALYZE county_boundaries;
SQL

echo
echo "Imported counties:"
psql "$DATABASE_URL" \
    -c "SELECT id, name FROM county_boundaries ORDER BY name;"