package util

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"time"

	"k8s.io/client-go/tools/clientcmd"
	"k8s.io/client-go/tools/clientcmd/api"

	"github.com/wencaiwulue/kubevpn/v2/pkg/config"
)

func Join(names ...string) string {
	return strings.Join(names, "_")
}

func ContainerNet(name string) string {
	return fmt.Sprintf("container:%s", name)
}

func GenEnvoyUID(ns, uid string) string {
	return fmt.Sprintf("%s.%s", ns, uid)
}

func GenKubeconfigTempPath(kubeconfigBytes []byte) string {
	var path string
	cluster, ns, _ := GetCluster(kubeconfigBytes)
	if !ContainsPathSeparator(cluster) && !ContainsPathSeparator(ns) {
		pattern := fmt.Sprintf("%s_%s_%d", cluster, ns, time.Now().Unix())
		pattern = strings.ReplaceAll(pattern, string(os.PathSeparator), "-")
		path = filepath.Join(config.GetTempPath(), pattern)
	} else {
		path = filepath.Join(config.GetTempPath(), fmt.Sprintf("%d", time.Now().Unix()))
	}
	return path
}

func ContainsPathSeparator(pattern string) bool {
	for i := 0; i < len(pattern); i++ {
		if os.IsPathSeparator(pattern[i]) {
			return true
		}
	}
	return false
}

func GetCluster(kubeConfigBytes []byte) (cluster string, ns string, err error) {
	var clientConfig clientcmd.ClientConfig
	clientConfig, err = clientcmd.NewClientConfigFromBytes(kubeConfigBytes)
	if err != nil {
		return
	}
	var rawConfig api.Config
	rawConfig, err = clientConfig.RawConfig()
	if err != nil {
		return
	}
	if err = api.FlattenConfig(&rawConfig); err != nil {
		return
	}
	if rawConfig.Contexts == nil {
		return
	}
	kubeContext := rawConfig.Contexts[rawConfig.CurrentContext]
	if kubeContext == nil {
		return
	}
	cluster = kubeContext.Cluster
	ns = kubeContext.Namespace
	return
}