package node

import (
	"context"
	"fmt"
	"os"
	"strings"

	"k8s.io/klog/v2"
	system "undecided.project/monok8s/pkg/system"
)

func ConfigureDefaultCNI(ctx context.Context, n *NodeContext) error {
	_ = ctx

	const (
		cniDir       = "/etc/cni/net.d"
		enabledPath  = cniDir + "/10-crio-bridge.conflist"
		disabledPath = cniDir + "/10-crio-bridge.conflist.disabled"
	)

	plugin := strings.TrimSpace(n.Config.Spec.CNIPlugin)

	switch plugin {
	case "none":
		// Fail hard if we cannot ensure the default bridge CNI is disabled.
		if _, err := os.Stat(enabledPath); err == nil {
			if err := os.Rename(enabledPath, disabledPath); err != nil {
				return fmt.Errorf("disable default CRI-O bridge CNI: %w", err)
			}
		} else if !os.IsNotExist(err) {
			return fmt.Errorf("stat %s: %w", enabledPath, err)
		}

		klog.Infof("Default CRI-O bridge CNI disabled")
		return nil

	case "bridge":
		fallthrough
	case "default":
		// Fail soft. User can still install or provide their own CNI.
		if _, err := os.Stat(disabledPath); err == nil {
			if err := os.Rename(disabledPath, enabledPath); err != nil {
				klog.Warningf("failed enabling default CRI-O bridge CNI: %v", err)
				return nil
			}
		} else if !os.IsNotExist(err) {
			klog.Warningf("failed stating %s while enabling default CRI-O bridge CNI: %v", disabledPath, err)
			return nil
		}

		klog.Infof("Default CRI-O bridge CNI enabled")
		return nil

	}
	klog.Infof("unsupported CNIPlugin: %q", plugin)
	return nil
}

func StartCRIO(ctx context.Context, n *NodeContext) error {
	return system.EnsureServiceRunning(ctx, n.SystemRunner, "crio")
}