package panelui

import (
	"fmt"
	"html/template"
	"net/http"
	"os"
	"strings"

	"github.com/GeertJohan/go.rice"
)

func templateGet(w http.ResponseWriter, r *http.Request, name string, box *rice.Box) (*template.Template, error) {
	tmplRaw, err := box.Bytes(name)
	if err != nil {
		w.WriteHeader(500)
		fmt.Fprintln(os.Stderr, err)
		fmt.Fprintln(w, "Unexpected error processing template")
		return nil, err
	}
	tmpl := template.Must(template.New(name).Parse(string(tmplRaw)))
	return tmpl, nil
}

func templateExecute(w http.ResponseWriter, r *http.Request, name string, box *rice.Box, data map[string]interface{}) error {
	tmpl, err := templateGet(w, r, name, box)
	if err != nil {
		return err
	}
	// TODO: run template _before_ writing it (to a buffer) so that appropriate error can be checked
	w.WriteHeader(200)
	if strings.HasSuffix(name, ".html") {
		w.Header().Set("Content-type", "text/html")
	}
	if pref, has := os.LookupEnv("PANEL_PREFIX"); has {
		data["BaseURL"] = pref
	} else {
		data["BaseURL"] = "/"
	}
	tmpl.Execute(w, data)
	return nil
}