package main

import (
	"embed"
	"html/template"
	"io/fs"
	"net/http"
	"time"
)

//go:embed templates/*.html
var templateFS embed.FS

//go:embed static
var staticFS embed.FS

// staticHandler serves the embedded static/ directory at /static/.
func staticHandler() http.Handler {
	sub, err := fs.Sub(staticFS, "static")
	if err != nil {
		panic(err)
	}
	return http.StripPrefix("/static/", http.FileServer(http.FS(sub)))
}

var tmpl *template.Template

var funcMap = template.FuncMap{
	"money": func(v float64) string { return fmtNum(v) },
	"hours": func(minutes float64) string { return fmtNum(minutes / 60.0) },
	"datef": func(t time.Time) string { return t.Format("02 Jan") },
	"hm":    func(t time.Time) string { return t.Format("15:04") },
	"hmp": func(t *time.Time) string {
		if t == nil {
			return ""
		}
		return t.Format("15:04")
	},
	"timef": func(t *time.Time) string {
		if t == nil {
			return "running…"
		}
		return t.Format("15:04")
	},
	"dateInput": func(t time.Time) string { return t.Format("02-01-2006") },
	"today":     func() string { return time.Now().Format("02-01-2006") },
	"rfc3339":   func(t time.Time) string { return t.Format(time.RFC3339) },
}

func parseTemplates() error {
	t, err := template.New("").Funcs(funcMap).ParseFS(templateFS, "templates/*.html")
	if err != nil {
		return err
	}
	tmpl = t
	return nil
}

// render executes a named template and writes any error to the log/response.
func (s *Server) render(w http.ResponseWriter, name string, data any) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := tmpl.ExecuteTemplate(w, name, data); err != nil {
		s.errl.Printf("render %s: %v", name, err)
		http.Error(w, "template error", http.StatusInternalServerError)
	}
}