// Package templates provides embedded HTML templates for the RouteWatch application
package templates

import (
	_ "embed"
	"html/template"
	"sync"
)

//go:embed status.html
var statusHTML string

// Templates contains all parsed templates
type Templates struct {
	Status *template.Template
}

var (
	//nolint:gochecknoglobals // Singleton pattern for templates
	defaultTemplates *Templates
	//nolint:gochecknoglobals // Singleton pattern for templates
	once sync.Once
)

// initTemplates parses all embedded templates
func initTemplates() {
	var err error

	defaultTemplates = &Templates{}

	// Parse status template
	defaultTemplates.Status, err = template.New("status").Parse(statusHTML)
	if err != nil {
		panic("failed to parse status template: " + err.Error())
	}
}

// Get returns the singleton Templates instance
func Get() *Templates {
	once.Do(initTemplates)

	return defaultTemplates
}

// StatusTemplate returns the parsed status template
func StatusTemplate() *template.Template {
	return Get().Status
}