package template

import (
	"bytes"
	"fmt"
	"html/template"
	"io/fs"
)

// Engine is a template engine
type Engine struct {
	templates *template.Template
}

// Render renders the template with the given name and data
func (e *Engine) Render(name string, data any) ([]byte, error) {
	var buf bytes.Buffer

	if err := e.templates.ExecuteTemplate(&buf, name, data); err != nil {
		return nil, fmt.Errorf("failed to execute template: %w", err)
	}

	return buf.Bytes(), nil
}

// NewTemplateEngine creates a new template engine from the given templates
func NewEngine(templates fs.FS) (*Engine, error) {
	tmpls, err := template.ParseFS(templates, "*.html", "**/*.html")
	if err != nil {
		return nil, fmt.Errorf("failed to parse templates: %w", err)
	}

	return &Engine{
		templates: tmpls,
	}, nil
}