package handlers

import (
	"html/template"
	"net/http"
)

// NotFoundHandler handles 404 errors
type NotFoundHandler struct {
	Templates   *template.Template
	RegistryURL string
}

func (h *NotFoundHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	RenderNotFound(w, r, h.Templates, h.RegistryURL)
}

// RenderNotFound renders the 404 page template.
// Use this from other handlers when a resource is not found.
func RenderNotFound(w http.ResponseWriter, r *http.Request, templates *template.Template, registryURL string) {
	w.WriteHeader(http.StatusNotFound)

	data := struct {
		PageData
	}{
		PageData: NewPageData(r, registryURL),
	}

	if err := templates.ExecuteTemplate(w, "404", data); err != nil {
		http.Error(w, "Page not found", http.StatusNotFound)
	}
}