package webapp

import (
	"embed"
	"html/template"
	"io"
	"io/fs"
)

//go:embed templates
var embedFS embed.FS

type WebApp struct {
	templates *template.Template
}

// New creates a WebApp with templates loaded from the embedded filesystem.
func New() (*WebApp, error) {
	sub, err := fs.Sub(embedFS, "templates")
	if err != nil {
		return nil, err
	}
	t, err := template.ParseFS(sub, "*.tmpl", "admin/*.tmpl")
	if err != nil {
		return nil, err
	}
	return &WebApp{templates: t}, nil
}

func Must(w *WebApp, err error) *WebApp {
	if err != nil {
		panic(err)
	}
	return w
}

func (w *WebApp) ExecuteTemplate(wr io.Writer, t string, data interface{}) error {
	return w.templates.ExecuteTemplate(wr, t, data)
}