package main

import (
	"context"
	"errors"
	"flag"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"codeberg.org/SquidSE/ClusterCanvas/service/internal/settings"
	"codeberg.org/SquidSE/ClusterCanvas/service/internal/websrv"
)

func main() {
	webDirFlag := flag.String("webdir", "web", "directory of built SPA assets")
	configDirFlag := flag.String(
		"configdir",
		"",
		"config directory for listen address (default /etc/ClusterCanvas; overrides CLUSTERCANVAS_CONFIG_DIR)",
	)
	flag.Parse()

	configDir, err := settings.ResolveDir(*configDirFlag)
	if err != nil {
		log.Fatalf("config dir: %v", err)
	}

	port := os.Getenv("WEBUI_PORT")
	if port == "" {
		port = "5173"
	}

	apiURL := os.Getenv("API_URL")
	if apiURL == "" {
		apiURL = "http://127.0.0.1:8080"
	}

	handler, err := websrv.NewHandler(*webDirFlag, apiURL)
	if err != nil {
		log.Fatalf("webui handler: %v", err)
	}

	listenHost := settings.ListenHost(configDir)
	listenAddr := listenHost + ":" + port
	server := &http.Server{
		Addr:              listenAddr,
		Handler:           handler,
		ReadHeaderTimeout: 5 * time.Second,
	}

	go func() {
		log.Printf("clustercanvas webui listening on http://%s (webdir=%s; API proxy %s)", listenAddr, *webDirFlag, apiURL)
		if err := server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			log.Fatalf("listen: %v", err)
		}
	}()

	stopSignals := make(chan os.Signal, 1)
	signal.Notify(stopSignals, syscall.SIGINT, syscall.SIGTERM)
	<-stopSignals

	shutdownContext, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	if err := server.Shutdown(shutdownContext); err != nil {
		log.Fatalf("shutdown: %v", err)
	}
	log.Print("webui stopped")
}