package main

import (
	"log"
	"net/http"
	"time"
)

type SessionProvider interface {
	Create(user User, expr time.Duration) (string, error)
	Get(key string) (User, error)
	Refresh(key string, user User, expr time.Duration) error
}

type PageProvider interface {
	Page(key string) (*Page, error)
	Save(key string, page *Page) error
}

type RootHandler struct {
	Sessions SessionProvider
	Pages    PageProvider
}

func (h *RootHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	if r.URL.Path == "/admin" {
		w.Write([]byte("admin route"))
		return
	}
	page, err := h.Pages.Page(r.URL.Path)
	if err == ErrPageNotFound {
		w.WriteHeader(http.StatusNotFound)
		w.Write([]byte("not found"))
		return
	}
	w.Write(page.Contents)
}

func main() {
	handler := &RootHandler{
		Sessions: &Sessions{},
		Pages:    &Index{},
	}
	handler.Pages.Save("foo", &Page{
		Contents: []byte("foobar"),
	})

	err := http.ListenAndServe(":8080", handler)
	log.Fatalf("server error: %v", err)
}