package ui

import (
	"net/http"
	"path/filepath"
	"strings"

	"git.lohmar.co.uk/lexton-it/NextWks/core/auth"
	"git.lohmar.co.uk/lexton-it/NextWks/core/i18n"
)

// PageCtx holds page-level data passed to templates.
type PageCtx struct {
	UserID string
	Role   string
	Locale i18n.T
}

type Handler struct {
	appDir      string
	defaultLang string
}

func NewHandler(appDir string, defaultLang string) *Handler {
	return &Handler{appDir: appDir, defaultLang: defaultLang}
}

func (h *Handler) RegisterRoutes(mux *http.ServeMux, authGate func(http.Handler) http.Handler) {
	staticDir := filepath.Join(h.appDir, "static")
	mux.Handle("GET /static/", http.StripPrefix("/static", http.FileServer(http.Dir(staticDir))))
	mux.Handle("GET /", authGate(http.HandlerFunc(h.launcherPage)))
}

func (h *Handler) launcherPage(w http.ResponseWriter, r *http.Request) {
	if r.URL.Path != "/" {
		http.NotFound(w, r)
		return
	}

	ctx := h.getContext(r)
	apps := DefaultApps(ctx.Role)
	component := LauncherPage(ctx, apps)
	component.Render(r.Context(), w)
}

func (h *Handler) getContext(r *http.Request) PageCtx {
	userID, _ := auth.GetUserID(r)
	role, _ := r.Context().Value(auth.ContextRole).(string)
	if role == "" {
		role = "user"
	}

	// Detect language: cookie > header > config default
	lang := h.defaultLang
	if lang == "" {
		lang = "en"
	}
	if cookie, err := r.Cookie("lang"); err == nil {
		lang = cookie.Value
	} else if al := r.Header.Get("Accept-Language"); al != "" {
		for _, l := range i18n.Supported() {
			if strings.HasPrefix(al, l) {
				lang = l
				break
			}
		}
	}

	return PageCtx{
		UserID: userID,
		Role:   role,
		Locale: i18n.Get(lang),
	}
}