package main

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

func ParseTemplates(tmpl *template.Template, path string) (map[string]*template.Template, error) {
	tmplMap := map[string]*template.Template{}

	err := parseTemplates(tmpl, tmplMap, path, path)
	if err != nil {
		return nil, err
	}

	return tmplMap, nil
}

func parseTemplates(tmpl *template.Template, tmplMap map[string]*template.Template, path string, trimPrefix string) error {
	var err error

	dirEntries, err := os.ReadDir(path)
	if err != nil {
		return err
	}

	for _, dirEntry := range dirEntries {
		entryPath := filepath.Join(path, dirEntry.Name())
		if dirEntry.IsDir() {
			err = parseTemplates(tmpl, tmplMap, entryPath, trimPrefix)
			if err != nil {
				return err
			}
			continue
		}

		data, err := ReadFileString(entryPath)
		if err != nil {
			return err
		}

		tmplName := filepath.Clean(strings.TrimPrefix(entryPath, trimPrefix))
		if tmplName[0] == '/' {
			tmplName = tmplName[1:]
		}

		tmpl, err = tmpl.New(tmplName).Parse(string(data))
		if err != nil {
			return ErrInvalidTemplateSyntax.Wrap(err, tmplName)
		}

		tmplMap[tmplName] = tmpl
	}

	return nil
}