package node

import (
	"context"
	"fmt"
	"strings"

	"k8s.io/klog/v2"
)

func WaitForExistingClusterIfNeeded(context.Context, *NodeContext) error {
	klog.Info("wait_for_existing_cluster_if_needed: TODO implement kubelet/admin.conf waits")
	return nil
}

func CheckRequiredImages(ctx context.Context, n *NodeContext) error {
	if n.Config.Spec.SkipImageCheck {
		klog.Infof("skipping image check (skipImageCheck=true)")
		return nil
	}

	k8sVersion := strings.TrimSpace(n.Config.Spec.KubernetesVersion)
	if k8sVersion == "" {
		return fmt.Errorf("kubernetesVersion is required")
	}

	klog.Infof("checking required Kubernetes images for %s...", k8sVersion)

	result, err := n.SystemRunner.Run(ctx,
		"kubeadm", "config", "images", "list",
		"--kubernetes-version", k8sVersion,
	)
	if err != nil {
		return fmt.Errorf("list required Kubernetes images for %s: %w", k8sVersion, err)
	}

	var missing []string
	for _, img := range strings.Fields(result.Stdout) {
		if err := checkImagePresent(ctx, n, img); err != nil {
			klog.Errorf("MISSING image: %s", img)
			missing = append(missing, img)
			continue
		}
		klog.Infof("found image: %s", img)
	}

	if len(missing) > 0 {
		return fmt.Errorf("preload the Kubernetes images before bootstrapping; missing: %s", strings.Join(missing, ", "))
	}

	klog.Infof("all required images are present")
	return nil
}

func checkImagePresent(ctx context.Context, n *NodeContext, image string) error {
	image = strings.TrimSpace(image)
	if image == "" {
		return fmt.Errorf("image is required")
	}

	// crictl inspecti exits non-zero when the image is absent.
	_, err := n.SystemRunner.Run(ctx, "crictl", "inspecti", image)
	if err != nil {
		return fmt.Errorf("image %q not present: %w", image, err)
	}
	return nil
}
func GenerateKubeadmConfig(context.Context, *NodeContext) error {
	klog.Info("generate_kubeadm_config: TODO render kubeadm v1beta4 config from MonoKSConfig")
	return nil
}
func RunKubeadmInit(context.Context, *NodeContext) error {
	klog.Info("run_kubeadm_init: TODO implement kubeadm init --config <file>")
	return nil
}
func RunKubeadmUpgradeApply(context.Context, *NodeContext) error {
	klog.Info("run_kubeadm_upgrade_apply: TODO implement kubeadm upgrade apply")
	return nil
}
func RunKubeadmJoin(context.Context, *NodeContext) error {
	klog.Info("run_kubeadm_join: TODO implement kubeadm join")
	return nil
}
func RunKubeadmUpgradeNode(context.Context, *NodeContext) error {
	klog.Info("run_kubeadm_upgrade_node: TODO implement kubeadm upgrade node")
	return nil
}