package frontend

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

	"github.com/sirupsen/logrus"
)

var (
	//go:embed static
	static embed.FS
	Static fs.FS

	//go:embed *.html
	templatesFS embed.FS
	Templates   *template.Template

	funcs = template.FuncMap{
		"static": staticFn,
		"staticCSS": func(filename string) (template.CSS, error) {
			data, err := staticFn(filename)
			return template.CSS(data), err
		},
	}
)

func init() {
	t := template.New("").Funcs(funcs)

	var err error
	Templates, err = t.ParseFS(templatesFS, "*")
	if err != nil {
		panic(err)
	}

	Static, err = fs.Sub(static, "static")
	if err != nil {
		panic(err)
	}
}

func staticFn(filename string) (string, error) {
	f, err := Static.Open(filename)
	if err != nil {
		return "", err
	}
	defer f.Close()

	data, err := io.ReadAll(f)
	if err != nil {
		return "", err
	}

	logrus.WithFields(logrus.Fields{
		"filename": filename,
		"data":     string(data),
	}).Debug("reading static file for template")

	return string(data), nil
}