package main

import (
	"context"
	"embed"
	"flag"
	"html/template"
	"log"
	"net"
	"net/http"
	"time"

	"github.com/go-chi/chi/v5"
)

var (
	//go:embed template
	templateFS embed.FS
	//go:embed static
	staticFS embed.FS
)

func main() {
	var configFilename, listenAddr string
	flag.StringVar(&configFilename, "config", "/etc/sinwon/config", "Configuration filename")

	flag.StringVar(&listenAddr, "listen", ":8080", "HTTP listen address")

	flag.StringVar(&listenAddr, "listen", "", "HTTP listen address")

	flag.Parse()

	cfg, err := loadConfig(configFilename)
	if err != nil {
		log.Fatalf("Failed to load config file: %v", err)
	}

	if listenAddr == "" {
		listenAddr = cfg.Listen
	}
	if listenAddr == "" {
		log.Fatalf("Missing listen configuration")
	}
	if cfg.Database == "" {
		log.Fatalf("Missing database configuration")
	}

	db, err := openDB(cfg.Database)
	if err != nil {
		log.Fatalf("Failed to open DB: %v", err)
	}

	tpl := template.Must(template.ParseFS(templateFS, "template/*.html"))

	mux := chi.NewRouter()
	mux.Handle("/static/*", http.FileServer(http.FS(staticFS)))
	mux.Get("/", index)
	mux.HandleFunc("/login", login)
	mux.Post("/logout", logout)
	mux.HandleFunc("/client/new", manageClient)
	mux.HandleFunc("/client/{id}", manageClient)
	mux.HandleFunc("/user/new", manageUser)
	mux.HandleFunc("/user/{id}", manageUser)
	mux.Get("/.well-known/oauth-authorization-server", getOAuthServerMetadata)
	mux.HandleFunc("/authorize", authorize)
	mux.Post("/token", exchangeToken)
	mux.Post("/introspect", introspectToken)

	go maintainDBLoop(db)

	server := http.Server{
		Addr:    listenAddr,
		Handler: loginTokenMiddleware(mux),
		BaseContext: func(net.Listener) context.Context {
			return newBaseContext(db, tpl)
		},
	}
	log.Printf("OAuth server listening on %v", server.Addr)
	if err := server.ListenAndServe(); err != nil {
		log.Fatalf("Failed to listen and serve: %v", err)
	}
}

func httpError(w http.ResponseWriter, err error) {
	log.Print(err)
	http.Error(w, "Internal server error", http.StatusInternalServerError)
}

func maintainDBLoop(db *DB) {
	ticker := time.NewTicker(15 * time.Minute)
	defer ticker.Stop()

	for range ticker.C {
		ctx := context.Background()
		ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
		if err := db.Maintain(ctx); err != nil {
			log.Printf("Failed to perform database maintenance: %v", err)
		}
		cancel()
	}
}