package registration

import (
	"context"
	"fmt"

	v1 "github.com/rancher/os2/pkg/apis/rancheros.cattle.io/v1"
	"github.com/rancher/os2/pkg/clients"
	ranchercontrollers "github.com/rancher/os2/pkg/generated/controllers/management.cattle.io/v3"
	roscontrollers "github.com/rancher/os2/pkg/generated/controllers/rancheros.cattle.io/v1"
	"github.com/rancher/wrangler/pkg/randomtoken"
)

type handler struct {
	settingsCache ranchercontrollers.SettingCache
}

func Register(ctx context.Context, clients *clients.Clients) {
	h := handler{
		settingsCache: clients.Rancher.Setting().Cache(),
	}
	roscontrollers.RegisterMachineRegistrationStatusHandler(ctx, clients.OS.MachineRegistration(), "Ready", "machine-registration",
		h.OnChange)
}

func (h *handler) OnChange(obj *v1.MachineRegistration, status v1.MachineRegistrationStatus) (v1.MachineRegistrationStatus, error) {
	serverURL, err := h.serverURL()
	if err != nil {
		return status, err
	}

	if status.RegistrationToken == "" {
		status.RegistrationToken, err = randomtoken.Generate()
		if err != nil {
			return status, err
		}
	}

	status.RegistrationURL = serverURL + "/v1-rancheros/registration/" + status.RegistrationToken
	return status, nil
}

func (h *handler) serverURL() (string, error) {
	setting, err := h.settingsCache.Get("server-url")
	if err != nil {
		return "", err
	}
	if setting.Value == "" {
		return "", fmt.Errorf("server-url is not set")
	}
	return setting.Value, nil
}