package main

import (
	"io/ioutil"
	"os"
	"path/filepath"
	"strings"
	"text/template"
)

type templateData struct {
	SiteTitle     string
	StylesheetUrl string
	Nav           []navItem
	Content       []string
}

func loadTemplate(cfg config) (templ *template.Template) {
	tmpl_raw, err := ioutil.ReadFile(cfg.TemplateFile)
	if err != nil {
		panic(err)
	}
	templ, err = template.New("template").Parse(string(tmpl_raw))
	if err != nil {
		panic(err)
	}
	return
}

func applyTemplate(dir string, data templateData, tmpl *template.Template) error {
	// ensure directory exists
	os.MkdirAll(strings.ToLower(dir), 0755)
	file := filepath.Join(strings.ToLower(dir), "index.html")

	// create file, fail if it already exists
	f, err := os.Create(file)
	if err != nil {
		return err
	}
	defer f.Close()

	// apply template, write to file
	err = tmpl.Execute(f, data)
	if err != nil {
		return err
	}

	return nil
}