/*
Copyright 2023 The Karmada Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package utils

import (
	"crypto/rand"
	"encoding/base64"
	"io"
	"os"
	"reflect"
	"testing"

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

func TestCreateBasic(t *testing.T) {
	type args struct {
		serverURL   string
		userName    string
		clusterName string
		caCert      []byte
	}
	tests := []struct {
		name string
		args args
		want *clientcmdapi.Config
	}{
		{
			name: "create config from args",
			args: args{
				serverURL:   "https://127.0.0.1:6443",
				userName:    "admin",
				clusterName: "local",
				caCert:      []byte{'c', 'a', 'c', 'e', 'r', 't'},
			},
			want: &clientcmdapi.Config{
				Clusters: map[string]*clientcmdapi.Cluster{
					"local": {
						Server:                   "https://127.0.0.1:6443",
						CertificateAuthorityData: []byte{'c', 'a', 'c', 'e', 'r', 't'},
					},
				},
				Contexts: map[string]*clientcmdapi.Context{
					"local": {
						Cluster:  "local",
						AuthInfo: "admin",
					},
				},
				AuthInfos:      map[string]*clientcmdapi.AuthInfo{},
				CurrentContext: "local",
			},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := CreateBasic(tt.args.serverURL, tt.args.userName, tt.args.clusterName, tt.args.caCert); !reflect.DeepEqual(got, tt.want) {
				t.Errorf("CreateBasic() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestCreateWithCerts(t *testing.T) {
	type args struct {
		serverURL   string
		userName    string
		clusterName string
		caCert      []byte
		clientKey   []byte
		clientCert  []byte
	}
	tests := []struct {
		name string
		args args
		want *clientcmdapi.Config
	}{
		{
			name: "create config from args with certs",
			args: args{
				serverURL:   "https://127.0.0.1:6443",
				userName:    "admin",
				clusterName: "local",
				caCert:      []byte{'c', 'a', 'c', 'e', 'r', 't'},
				clientKey:   []byte{'c', 'l', 'i', 'e', 'n', 't', 'k', 'e', 'y'},
				clientCert:  []byte{'c', 'l', 'i', 'e', 'n', 't', 'c', 'e', 'r', 't'},
			},
			want: &clientcmdapi.Config{
				Clusters: map[string]*clientcmdapi.Cluster{
					"local": {
						Server:                   "https://127.0.0.1:6443",
						CertificateAuthorityData: []byte{'c', 'a', 'c', 'e', 'r', 't'},
					},
				},
				Contexts: map[string]*clientcmdapi.Context{
					"local": {
						Cluster:  "local",
						AuthInfo: "admin",
					},
				},
				AuthInfos: map[string]*clientcmdapi.AuthInfo{
					"admin": {
						ClientKeyData:         []byte{'c', 'l', 'i', 'e', 'n', 't', 'k', 'e', 'y'},
						ClientCertificateData: []byte{'c', 'l', 'i', 'e', 'n', 't', 'c', 'e', 'r', 't'},
					},
				},
				CurrentContext: "local",
			},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := CreateWithCerts(tt.args.serverURL, tt.args.userName, tt.args.clusterName, tt.args.caCert, tt.args.clientKey, tt.args.clientCert); !reflect.DeepEqual(got, tt.want) {
				t.Errorf("CreateWithCerts() = %v, want %v", got, tt.want)
			}
		})
	}
}

func randString() string {
	b := make([]byte, 16)
	if _, err := io.ReadFull(rand.Reader, b); err != nil {
		panic(err)
	}
	return base64.URLEncoding.EncodeToString(b)
}

func TestWriteKubeConfigFromSpec(t *testing.T) {
	type args struct {
		serverURL      string
		userName       string
		clusterName    string
		kubeconfigPath string
		kubeconfigName string
		caCert         []byte
		clientKey      []byte
		clientCert     []byte
	}
	tests := []struct {
		name    string
		args    args
		wantErr bool
	}{
		{
			name: "Test Write KubeConfig From Spec",
			args: args{
				serverURL:      "https://127.0.0.1:6443",
				userName:       "admin",
				clusterName:    "local",
				kubeconfigPath: "temp-kubeconfig-" + randString(),
				kubeconfigName: "karmada-test.kubeconfig",
				caCert:         []byte{'c', 'a', 'c', 'e', 'r', 't'},
				clientKey:      []byte{'c', 'l', 'i', 'e', 'n', 't', 'k', 'e', 'y'},
				clientCert:     []byte{'c', 'l', 'i', 'e', 'n', 't', 'c', 'e', 'r', 't'},
			},
			wantErr: false,
		},
	}
	for _, tt := range tests {
		// create config path
		if err := os.Mkdir(tt.args.kubeconfigPath, 0755); err != nil {
			t.Fatal(err)
		}
		t.Run(tt.name, func(t *testing.T) {
			if err := WriteKubeConfigFromSpec(tt.args.serverURL, tt.args.userName, tt.args.clusterName, tt.args.kubeconfigPath, tt.args.kubeconfigName, tt.args.caCert, tt.args.clientKey, tt.args.clientCert); (err != nil) != tt.wantErr {
				t.Errorf("WriteKubeConfigFromSpec() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
		// cleanup test data
		os.RemoveAll(tt.args.kubeconfigPath)
	}
}