package http

import (
	"fmt"
	"html/template"
	"net/http"
	"path/filepath"
	"time"

	"superbanka/internal/platform"
)

type ViewData struct {
	Title     string
	Page      string
	CSRFToken string
	Flash     string
	Error     string
	User      any
	Admin     any
	Data      any
}

type Renderer struct {
	templates *template.Template
}

func NewRenderer(location *time.Location) (*Renderer, error) {
	if location == nil {
		location = time.UTC
	}

	funcs := template.FuncMap{
		"money": platform.FormatCZK,
		"dt": func(t time.Time) string {
			if t.IsZero() {
				return ""
			}

			return t.In(location).Format("02. 01. 2006 15:04")
		},
	}

	templates, err := template.New("all").Funcs(funcs).ParseGlob(filepath.Join("web", "templates", "layouts", "*.gohtml"))
	if err != nil {
		return nil, fmt.Errorf("parse layout templates: %w", err)
	}

	templates, err = templates.ParseGlob(filepath.Join("web", "templates", "pages", "*.gohtml"))
	if err != nil {
		return nil, fmt.Errorf("parse page templates: %w", err)
	}

	return &Renderer{templates: templates}, nil
}

func (r *Renderer) HTML(w http.ResponseWriter, status int, data ViewData) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	w.WriteHeader(status)

	if err := r.templates.ExecuteTemplate(w, "layouts/base", data); err != nil {
		http.Error(w, fmt.Sprintf("render template: %v", err), http.StatusInternalServerError)
	}
}