package main

import (
	"context"
	"log"
	"net/http"
	"os"

	"github.com/gorilla/handlers"
	"github.com/jackc/pgx/v5/pgxpool"
	"github.com/joho/godotenv"

	"gosten/model"
	"gosten/templ"
)

// flags
var (
	port uint64
	host string
)

var Q *model.Queries

func checkEnvEntry(e string) {
	if os.Getenv(e) == "" {
		log.Fatalf("Variable '%s' not set", e)
	}
}

func checkEnv() {
	checkEnvEntry("GOSTEN_DSN")
	checkEnvEntry("GOSTEN_ADDRESS")
}

func main() {
	if err := godotenv.Load(); err != nil {
		log.Fatal("Loading env file: ", err)
	}

	checkEnv()

	db, err := pgxpool.New(context.Background(), os.Getenv("GOSTEN_DSN"))
	if err != nil {
		log.Fatal(err)
	}
	if err := db.Ping(context.Background()); err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	Q = model.New(db)

	mux := http.NewServeMux()

	mux.Handle("GET /login", loginPage())
	mux.HandleFunc("POST /login", handleLogin)
	mux.Handle("GET /logout", handleLogout())
	mux.Handle("/static/", http.StripPrefix("/static", http.FileServer(http.Dir("static"))))
	mux.Handle("/favicon.ico", http.NotFoundHandler())

	handler := sessionHandler(csrfHandler(mux))
	handler = handlers.CombinedLoggingHandler(os.Stderr, handler)
	handler = handlers.ProxyHeaders(handler)

	// the real content, needing authentification
	authMux := http.NewServeMux()
	mux.Handle("/", RequireAuth(authMux))

	authMux.Handle("GET /{$}", indexPage())

	log.Fatal(http.ListenAndServe(os.Getenv("GOSTEN_ADDRESS"), handler))
}

func showTemplate(w http.ResponseWriter, tpl string, data any) {
	if err := templ.Lookup(tpl).Execute(w, data); err != nil {
		log.Panicf("Executing '%s' with %+v: %v", tpl, data, err)
	}
}

func indexPage() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		uid := userId(r)
		u, _ := Q.GetUserById(r.Context(), uid)
		showTemplate(w, "index", u.Name)
	}
}