// Package main — Gebos MQTT → Postgres ingester.
//
// Skeleton. Target: < 200 lines.
//
// Subscribes to topics of the form `t/<tenant_id>/d/<device_id>/<metric>`,
// extracts tenant_id and device_id from the topic, writes rows into
// public.telemetry on db-host as the gebos_ingest role (BYPASSRLS).
package main

import (
	"context"
	"log"
	"os"
	"os/signal"
	"syscall"
)

func main() {
	broker := os.Getenv("GEBOS_MQTT_BROKER")
	pgURL := os.Getenv("GEBOS_POSTGRES_URL")
	pgPassword := os.Getenv("GEBOS_POSTGRES_PASSWORD")

	if broker == "" || pgURL == "" || pgPassword == "" {
		log.Fatal("GEBOS_MQTT_BROKER, GEBOS_POSTGRES_URL and GEBOS_POSTGRES_PASSWORD must be set")
	}

	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()

	// TODO:
	//   1. pgxpool.New with password injected into the DSN
	//   2. paho MQTT client.Connect, Subscribe("t/+/d/+/+")
	//   3. on message: parse topic → (tenant_id, device_id, metric), parse
	//      payload (JSON for now), INSERT INTO public.telemetry
	//   4. batch with a short flush interval (50–100ms) for throughput
	//   5. shutdown on ctx.Done

	log.Printf("gebos-ingester: broker=%s db=<redacted> (stub)", broker)
	<-ctx.Done()
	log.Println("gebos-ingester: shutting down")
}