package html

import (
	"io/ioutil"
	"path/filepath"
)

type Loader interface {
	Load(*TemplateService) error
}

type DirectoryLoader struct {
	rootDir string
}

func (l *DirectoryLoader) Load(srv *TemplateService) error {
	blockFiles, err := filepath.Glob(filepath.Join(l.rootDir, "blocks", "*.tmpl"))
	if err != nil {
		return err
	}

	for _, f := range blockFiles {
		blockContent, err := ioutil.ReadFile(f)
		if err != nil {
			return err
		}

		blockName := filepath.Base(f)
		srv.AddBlock(blockName, string(blockContent))
	}

	layoutFiles, err := filepath.Glob(filepath.Join(l.rootDir, "layouts", "*.tmpl"))
	if err != nil {
		return err
	}

	// Generate our templates map from our layouts/ and blocks/ directories
	for _, f := range layoutFiles {
		templateData, err := ioutil.ReadFile(f)
		if err != nil {
			return err
		}

		templateName := filepath.Base(f)

		if err := srv.LoadLayout(templateName, string(templateData)); err != nil {
			return err
		}
	}

	return nil
}

func NewDirectoryLoader(rootDir string) *DirectoryLoader {
	return &DirectoryLoader{rootDir}
}