#!/usr/bin/env bash

#
# Load geometries from GeoJSON to Postgres
# - assume postgres connection details are set in the environment using PGUSER, PGHOST etc.
#
: ${1?"Usage: $0 ./path/to/mastermap/dir"}

mastermap_dir=$1

#
# Create 'geometry' record with
#     id: <polygon-guid>,
#     source_id: <toid>,
#     geom: <geom>
#
find $mastermap_dir -type f -name '*.3857.csv' \
-printf "COPY geometries ( geometry_geom, source_id ) FROM '$mastermap_dir/%f' WITH CSV HEADER;\n" | \
parallel \
psql -c {}

#
# Delete any duplicated geometries (by TOID)
#
psql -c "DELETE FROM geometries a USING (
    SELECT MIN(ctid) as ctid, source_id
    FROM geometries
    GROUP BY source_id
    HAVING COUNT(*) > 1
) b
WHERE a.source_id = b.source_id
AND a.ctid <> b.ctid;"

#
# Create corresponding 'building' record with
#     id: <building-guid>,
#     doc: {},
#     geom_id: <polygon-guid>
#
psql -c "INSERT INTO buildings ( geometry_id ) SELECT geometry_id from geometries;"