package handlers

import (
	"errors"
	"net/http"

	"github.com/go-chi/chi/v5"
	"github.com/noderunners/nip05api/internal/user"
)

type Usernames struct{ Users *user.Service }

func (h *Usernames) Available(w http.ResponseWriter, r *http.Request) {
	name := user.NormalizeUsername(chi.URLParam(r, "name"))
	if err := user.ValidateUsername(name, h.Users.Reserved()); err != nil {
		WriteJSON(w, http.StatusOK, map[string]any{
			"username":  name,
			"available": false,
			"reason":    "invalid_or_reserved",
		})
		return
	}
	avail, err := h.Users.IsAvailable(r.Context(), name)
	if err != nil {
		if errors.Is(err, user.ErrInvalidUsername) {
			WriteJSON(w, http.StatusOK, map[string]any{
				"username":  name,
				"available": false,
				"reason":    "invalid",
			})
			return
		}
		WriteError(w, http.StatusInternalServerError, "InternalError", err.Error())
		return
	}
	WriteJSON(w, http.StatusOK, map[string]any{
		"username":  name,
		"available": avail,
	})
}