package main

import (
	"context"
	"librapi/server"
	"librapi/services"
	"os"
	"os/signal"
	"strconv"
	"sync"

	"github.com/rs/zerolog"
	"github.com/rs/zerolog/log"

	"librapi/handlers/home"
	"librapi/handlers/login"
	"librapi/handlers/upload"
)

const (
	defaultPort    = 8585
	defaulStoreDir = "./store"
)

var (
	isSecure = os.Getenv("API_SECURE") == "true"

	port = sync.OnceValue[int](func() int {
		port, err := strconv.Atoi(os.Getenv("API_PORT"))
		if err != nil {
			log.Warn().Err(err).Int("default", defaultPort).Msg("unable to load API_PORT, set to default")
			return defaultPort
		}
		return port
	})

	storeDir = sync.OnceValue[string](func() string {
		storeDir := os.Getenv("API_STORE_DIR")
		if storeDir == "" {
			log.Warn().Str("default", defaulStoreDir).Msg("API_STORE_DIR env var empty, set to default")
			return defaulStoreDir
		}
		return storeDir
	})
)

func initLogger() {
	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
	log.Logger = log.With().Caller().Logger().Output(zerolog.ConsoleWriter{Out: os.Stderr})
}

func main() {
	initLogger()

	ctx, fnCancel := signal.NotifyContext(context.Background(), os.Kill, os.Interrupt)
	defer fnCancel()

	auth := services.NewAuthentication(ctx, isSecure)
	bs := services.NewBookStore(storeDir())

	srv := server.NewServer(
		ctx,
		port(),
		server.NewHandler(home.URL, home.Handler(bs)),
		server.NewHandler(upload.URL, upload.Handler(auth, bs)),
		server.NewHandler(login.URL, login.Handler(auth)),
	)
	srv.Serve()

	<-srv.Done()
	<-auth.Done()
	<-bs.Done()
}