package main

import (
	"encoding/gob"
	"flag"
	"fmt"
	"log"
	"net"
	"net/http"
	"os"
	"strconv"

	"github.com/gorilla/handlers"
	"github.com/gorilla/schema"

	"gosten/model"
	"gosten/templ"
)

// flags
var (
	port uint64
	host string
)

func init() {
	flag.StringVar(&host, "h", "localhost", "address to listen on")
	flag.Uint64Var(&port, "p", 8080, "port to listen on")

	gob.Register(SessionData{})
}

var Q *model.Queries
var s *schema.Decoder

func main() {
	flag.Parse()

	db := openDB("")

	if err := db.Ping(); err != nil {
		log.Fatal(err)
	}

	Q = model.New(db)
	s = schema.NewDecoder()

	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(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())

	address := net.JoinHostPort(host, strconv.FormatUint(port, 10))
	log.Fatal(http.ListenAndServe(address, handler))
}

type User struct {
	Name       string  `form:"options=required"`
	Password   string  `form:"type=password;options=required"`
	RememberMe bool    `form:"type=checkbox;value=y;options=checked"`
	Errors     []error `form:"-"`
}

type fieldError struct {
	Field string
	Issue string
}

func (fe fieldError) Error() string {
	return fmt.Sprintf("%s: %v", fe.Field, fe.Issue)
}

func (fe fieldError) FieldError() (field, err string) {
	return fe.Field, fe.Issue
}

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 parseForm[T any](r *http.Request, data *T) {
	if err := r.ParseForm(); err != nil {
		log.Panic("Parsing form: ", err)
	}
	if err := s.Decode(data, r.PostForm); err != nil {
		log.Panic("Decoding form: ", 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)
	}
}