#!/bin/bash
# --------------------------------------------------------------------------
# check_routing_sync.sh
# Runs via cron every minute. The Redis request is cleared only after the
# rebuilt engine is healthy, so failed rebuilds remain queued for retry.
# --------------------------------------------------------------------------

set -euo pipefail

APP_DIR="${APP_DIR:-/home/hamzadoctor/app}"
DATA_DIR="${APP_DIR}/infrastructure/osm-data"
LOCK_FILE="/tmp/map-saas-routing-sync.lock"
cd "${APP_DIR}"

exec 9>"${LOCK_FILE}"
if ! flock -n 9; then
    exit 0
fi

# Read flag from Redis using the redis container
SYNC_REQ=$(docker compose exec -T redis redis-cli get routing_sync_requested | tr -d '\r')

if [ "$SYNC_REQ" = "1" ] || [ "$SYNC_REQ" = "\"1\"" ]; then
    echo "$(date -Is): Sync requested; rebuilding connected approved roads..."
    docker compose exec -T db psql -U mapuser -d mapdb -c \
        "UPDATE approved_roads SET routing_status='syncing', routing_error=NULL WHERE routing_status='queued';"

    if ! bash "${APP_DIR}/infrastructure/scripts/apply-delta.sh" "${APP_DIR}" "${DATA_DIR}/master_map.osm.pbf" "${DATA_DIR}/delta.osm"; then
        docker compose exec -T db psql -U mapuser -d mapdb -c \
            "UPDATE approved_roads SET routing_status='queued', routing_error='Delta export or merge failed; queued for retry.' WHERE routing_status='syncing';"
        exit 1
    fi

    docker compose stop routing
    rm -rf "${DATA_DIR}/graph-cache" "${DATA_DIR}/default-gh"
    docker compose up -d routing

    for _ in $(seq 1 90); do
        if curl -fsS http://localhost:8989/health >/dev/null 2>&1; then
            docker compose exec -T db psql -U mapuser -d mapdb -c \
                "UPDATE approved_roads SET routing_status='routed', routing_error=NULL, routed_at=NOW() WHERE routing_status='syncing';"
            docker compose exec -T redis redis-cli del routing_sync_requested >/dev/null
            echo "$(date -Is): Routing graph is ready; queued roads are routable."
            exit 0
        fi
        sleep 10
    done

    docker compose exec -T db psql -U mapuser -d mapdb -c \
        "UPDATE approved_roads SET routing_status='queued', routing_error='GraphHopper did not become healthy; queued for retry.' WHERE routing_status='syncing';"
    echo "$(date -Is): GraphHopper did not become healthy; retaining sync request for retry." >&2
    exit 1
fi