package mark2web

import (
	"log"

	"github.com/flosch/pongo2"
)

var templateCache = make(map[string]*pongo2.Template)
var templateDir string

// SetTemplateDir sets base directory for searching template files
func SetTemplateDir(dir string) {
	templateDir = dir
}

// renderTemplate renders a pongo2 template with context
func renderTemplate(filename string, node *TreeNode, pathConfig *PathConfig, ctx *pongo2.Context) (string, error) {
	CurrentContext = ctx
	CurrentTreeNode = node
	CurrentPathConfig = pathConfig
	templateFile := templateDir + "/" + filename
	template := templateCache[templateFile]
	if template == nil {
		var err error
		if template, err = pongo2.FromFile(templateFile); err != nil {
			log.Panicf("could not parse template '%s': %s", templateFile, err)
		} else {
			templateCache[templateFile] = template
		}
	}

	return template.Execute(*ctx)
}