package ersteller

import (
	"bytes"
	"fmt"
	"regexp"
	"strings"
	"text/template"
)

func FirstLetterToUpper(name string) string {
	return strings.ToUpper(name[:1]) + name[1:]
}

func FirstLetterToLower(name string) string {
	return strings.ToLower(name[:1]) + name[1:]
}

func InlineTemplate(templateString string, data any) string {
	dollarRegex := regexp.MustCompile(`\$(\w+)\$`)
	templateString = dollarRegex.ReplaceAllStringFunc(templateString, func(s string) string {
		if strings.HasPrefix(s, "$.") || strings.HasPrefix(s, "$end") || strings.HasPrefix(s, "$else") {
			return s
		}
		return dollarRegex.ReplaceAllString(s, "$.$1$")
	})
	tmpl, err := template.New("inline").Delims("$", "$").Parse(templateString)
	if err != nil {
		return fmt.Sprint("Failed to parse template ", err)
	}
	var buf bytes.Buffer
	err = tmpl.Execute(&buf, data)
	if err != nil {
		return fmt.Sprint("Failed to execute template ", err)
	}
	return buf.String()
}