package util

import (
	"strings"
	"testing"

	"github.com/ghodss/yaml"
	"github.com/stretchr/testify/assert"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/kubernetes/fake"
	"k8s.io/client-go/rest"
	clientcmdapiv1 "k8s.io/client-go/tools/clientcmd/api/v1"

	"github.com/argoproj/argo-cd/v2/pkg/apis/application/v1alpha1"
)

func Test_newCluster(t *testing.T) {
	labels := map[string]string{"key1": "val1"}
	annotations := map[string]string{"key2": "val2"}
	clusterWithData := NewCluster("test-cluster", []string{"test-namespace"}, false, &rest.Config{
		TLSClientConfig: rest.TLSClientConfig{
			Insecure:   false,
			ServerName: "test-endpoint.example.com",
			CAData:     []byte("test-ca-data"),
			CertData:   []byte("test-cert-data"),
			KeyData:    []byte("test-key-data"),
		},
		Host: "test-endpoint.example.com",
	},
		"test-bearer-token",
		&v1alpha1.AWSAuthConfig{},
		&v1alpha1.ExecProviderConfig{}, labels, annotations)

	assert.Equal(t, "test-cert-data", string(clusterWithData.Config.CertData))
	assert.Equal(t, "test-key-data", string(clusterWithData.Config.KeyData))
	assert.Equal(t, "", clusterWithData.Config.BearerToken)
	assert.Equal(t, labels, clusterWithData.Labels)
	assert.Equal(t, annotations, clusterWithData.Annotations)

	clusterWithFiles := NewCluster("test-cluster", []string{"test-namespace"}, false, &rest.Config{
		TLSClientConfig: rest.TLSClientConfig{
			Insecure:   false,
			ServerName: "test-endpoint.example.com",
			CAData:     []byte("test-ca-data"),
			CertFile:   "./testdata/test.cert.pem",
			KeyFile:    "./testdata/test.key.pem",
		},
		Host: "test-endpoint.example.com",
	},
		"test-bearer-token",
		&v1alpha1.AWSAuthConfig{},
		&v1alpha1.ExecProviderConfig{}, labels, nil)

	assert.True(t, strings.Contains(string(clusterWithFiles.Config.CertData), "test-cert-data"))
	assert.True(t, strings.Contains(string(clusterWithFiles.Config.KeyData), "test-key-data"))
	assert.Equal(t, "", clusterWithFiles.Config.BearerToken)
	assert.Equal(t, labels, clusterWithFiles.Labels)
	assert.Nil(t, clusterWithFiles.Annotations)

	clusterWithBearerToken := NewCluster("test-cluster", []string{"test-namespace"}, false, &rest.Config{
		TLSClientConfig: rest.TLSClientConfig{
			Insecure:   false,
			ServerName: "test-endpoint.example.com",
			CAData:     []byte("test-ca-data"),
		},
		Host: "test-endpoint.example.com",
	},
		"test-bearer-token",
		&v1alpha1.AWSAuthConfig{},
		&v1alpha1.ExecProviderConfig{}, nil, nil)

	assert.Equal(t, "test-bearer-token", clusterWithBearerToken.Config.BearerToken)
	assert.Nil(t, clusterWithBearerToken.Labels)
	assert.Nil(t, clusterWithBearerToken.Annotations)
}

func TestGetKubePublicEndpoint(t *testing.T) {
	cases := []struct {
		name             string
		clusterInfo      *corev1.ConfigMap
		expectedEndpoint string
		expectError      bool
	}{
		{
			name: "has public endpoint",
			clusterInfo: &corev1.ConfigMap{
				ObjectMeta: metav1.ObjectMeta{
					Namespace: "kube-public",
					Name:      "cluster-info",
				},
				Data: map[string]string{
					"kubeconfig": kubeconfigFixture("https://test-cluster:6443"),
				},
			},
			expectedEndpoint: "https://test-cluster:6443",
		},
		{
			name:        "no cluster-info",
			expectError: true,
		},
		{
			name: "no kubeconfig in cluster-info",
			clusterInfo: &corev1.ConfigMap{
				ObjectMeta: metav1.ObjectMeta{
					Namespace: "kube-public",
					Name:      "cluster-info",
				},
				Data: map[string]string{
					"argo": "the project, not the movie",
				},
			},
			expectError: true,
		},
		{
			name: "no clusters in cluster-info kubeconfig",
			clusterInfo: &corev1.ConfigMap{
				ObjectMeta: metav1.ObjectMeta{
					Namespace: "kube-public",
					Name:      "cluster-info",
				},
				Data: map[string]string{
					"kubeconfig": kubeconfigFixture(""),
				},
			},
			expectError: true,
		},
		{
			name: "can't parse kubeconfig",
			clusterInfo: &corev1.ConfigMap{
				ObjectMeta: metav1.ObjectMeta{
					Namespace: "kube-public",
					Name:      "cluster-info",
				},
				Data: map[string]string{
					"kubeconfig": "this is not valid YAML",
				},
			},
			expectError: true,
		},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			objects := []runtime.Object{}
			if tc.clusterInfo != nil {
				objects = append(objects, tc.clusterInfo)
			}
			clientset := fake.NewSimpleClientset(objects...)
			endpoint, err := GetKubePublicEndpoint(clientset)
			if err != nil && !tc.expectError {
				t.Fatalf("unexpected error: %v", err)
			}
			if err == nil && tc.expectError {
				t.Error("expected error to be returned, received none")
			}
			if endpoint != tc.expectedEndpoint {
				t.Errorf("expected endpoint %s, got %s", tc.expectedEndpoint, endpoint)
			}
		})
	}

}

func kubeconfigFixture(endpoint string) string {
	kubeconfig := &clientcmdapiv1.Config{}
	if len(endpoint) > 0 {
		kubeconfig.Clusters = []clientcmdapiv1.NamedCluster{
			{
				Name: "test-kube",
				Cluster: clientcmdapiv1.Cluster{
					Server: endpoint,
				},
			},
		}
	}
	configYAML, err := yaml.Marshal(kubeconfig)
	if err != nil {
		return ""
	}
	return string(configYAML)
}
