package main

import (
	"context"
	"flag"
	"fmt"
	"os"
	"os/signal"

	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/app"
	"golang.org/x/sys/unix"

	"gitea.libretechconsulting.com/rmcguire/ambient-local-exporter/pkg/ambient"
	"gitea.libretechconsulting.com/rmcguire/ambient-local-exporter/pkg/ambient/config"
)

const (
	defaultMetricPrefix = "weather"
)

var schema bool

func main() {
	ctx, cncl := signal.NotifyContext(context.Background(), os.Kill, os.Interrupt, unix.SIGTERM)
	defer cncl()

	// Read config and environment, prepare an appCtx, and merge
	// go-app config into ambient weather exporter app config
	ctx, awConfig := app.MustLoadConfigInto(ctx, &config.AmbientLocalExporterConfig{
		MetricPrefix:    defaultMetricPrefix,
		WeatherStations: make([]config.WeatherStation, 0),
	})

	// Prepare the ambient exporter with our prepared config
	// and set up logging, tracing, etc..
	aw := ambient.New(ctx, awConfig).Init()

	// Just show schema if that's all we were asked to do
	if schema {
		printSchema(awConfig)
		os.Exit(0)
	}

	// Load http and grpc routes, prepare the app
	awApp := prepareApp(ctx, aw)

	// Run app and wait
	awApp.MustRun()
	<-awApp.Done()
}

// flag.Parse will be called by go-app
func init() {
	flag.BoolVar(&schema, "schema", false, "generate json schema and exit")
}

func printSchema(config *config.AmbientLocalExporterConfig) {
	bytes, err := app.CustomSchema(config)
	if err != nil {
		panic(err)
	}

	fmt.Println(string(bytes))
}