package kubernetes

import (
	"hash"
	"hash/fnv"
	"net/http"
	"os"
	"path/filepath"
	"sync"
	"testing"
	"time"

	"github.com/sirupsen/logrus"
	"github.com/stretchr/testify/require"

	"github.com/dexidp/dex/storage/kubernetes/k8sapi"
)

// This test does not have an explicit error condition but is used
// with the race detector to detect the safety of idToName.
func TestIDToName(t *testing.T) {
	n := 100
	var wg sync.WaitGroup
	wg.Add(n)
	c := make(chan struct{})

	h := func() hash.Hash { return fnv.New64() }

	for i := 0; i < n; i++ {
		go func() {
			<-c
			name := idToName("foo", h)
			_ = name
			wg.Done()
		}()
	}
	close(c)
	wg.Wait()
}

func TestOfflineTokenName(t *testing.T) {
	h := func() hash.Hash { return fnv.New64() }

	userID1 := "john"
	userID2 := "jane"

	id1 := offlineTokenName(userID1, "local", h)
	id2 := offlineTokenName(userID2, "local", h)
	if id1 == id2 {
		t.Errorf("expected offlineTokenName to produce different hashes")
	}
}

func TestInClusterTransport(t *testing.T) {
	logger := &logrus.Logger{
		Out:       os.Stderr,
		Formatter: &logrus.TextFormatter{DisableColors: true},
		Level:     logrus.DebugLevel,
	}

	user := k8sapi.AuthInfo{Token: "abc"}
	cli, err := newClient(
		k8sapi.Cluster{},
		user,
		"test",
		logger,
		true,
	)
	require.NoError(t, err)

	fpath := filepath.Join(os.TempDir(), "test.in_cluster")
	defer os.RemoveAll(fpath)

	err = os.WriteFile(fpath, []byte("def"), 0o644)
	require.NoError(t, err)

	tests := []struct {
		name     string
		time     func() time.Time
		expected string
	}{
		{
			name: "Stale token",
			time: func() time.Time {
				return time.Now().Add(-24 * time.Hour)
			},
			expected: "def",
		},
		{
			name: "Normal token",
			time: func() time.Time {
				return time.Time{}
			},
			expected: "abc",
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			helper := newInClusterTransportHelper(user)
			helper.now = tc.time
			helper.tokenLocation = fpath

			cli.client.Transport = transport{
				updateReq: func(r *http.Request) {
					helper.UpdateToken()
					r.Header.Set("Authorization", "Bearer "+helper.GetToken())
				},
				base: cli.client.Transport,
			}

			_ = cli.isCRDReady("test")
			require.Equal(t, tc.expected, helper.info.Token)
		})
	}
}

func TestNamespaceFromServiceAccountJWT(t *testing.T) {
	namespace, err := namespaceFromServiceAccountJWT(serviceAccountToken)
	if err != nil {
		t.Fatal(err)
	}
	wantNamespace := "dex-test-namespace"
	if namespace != wantNamespace {
		t.Errorf("expected namespace %q got %q", wantNamespace, namespace)
	}
}

func TestGetClusterConfigNamespace(t *testing.T) {
	const namespaceENVVariableName = "TEST_GET_CLUSTER_CONFIG_NAMESPACE"
	{
		os.Setenv(namespaceENVVariableName, "namespace-from-env")
		defer os.Unsetenv(namespaceENVVariableName)
	}

	var namespaceFile string
	{
		tmpfile, err := os.CreateTemp(os.TempDir(), "test-get-cluster-config-namespace")
		require.NoError(t, err)

		_, err = tmpfile.Write([]byte("namespace-from-file"))
		require.NoError(t, err)

		namespaceFile = tmpfile.Name()
		defer os.Remove(namespaceFile)
	}

	tests := []struct {
		name        string
		token       string
		fileName    string
		envVariable string

		expectedError     bool
		expectedNamespace string
	}{
		{
			name:        "With env variable",
			envVariable: "TEST_GET_CLUSTER_CONFIG_NAMESPACE",

			expectedNamespace: "namespace-from-env",
		},
		{
			name:  "With token",
			token: serviceAccountToken,

			expectedNamespace: "dex-test-namespace",
		},
		{
			name:     "With namespace file",
			fileName: namespaceFile,

			expectedNamespace: "namespace-from-file",
		},
		{
			name:     "With file and token",
			fileName: namespaceFile,
			token:    serviceAccountToken,

			expectedNamespace: "dex-test-namespace",
		},
		{
			name:        "With file and env",
			fileName:    namespaceFile,
			envVariable: "TEST_GET_CLUSTER_CONFIG_NAMESPACE",

			expectedNamespace: "namespace-from-env",
		},
		{
			name:        "With token and env",
			envVariable: "TEST_GET_CLUSTER_CONFIG_NAMESPACE",
			token:       serviceAccountToken,

			expectedNamespace: "namespace-from-env",
		},
		{
			name:        "With file, token and env",
			fileName:    namespaceFile,
			token:       serviceAccountToken,
			envVariable: "TEST_GET_CLUSTER_CONFIG_NAMESPACE",

			expectedNamespace: "namespace-from-env",
		},
		{
			name:          "Without anything",
			expectedError: true,
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			namespace, err := getInClusterConfigNamespace(tc.token, tc.envVariable, tc.fileName)
			if tc.expectedError {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
			}
			require.Equal(t, namespace, tc.expectedNamespace)
		})
	}
}

const serviceAccountToken = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.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.KViBpPwCiBwxDvAjYUUXoVvLVwqV011aLlYQpNtX12Bh8M-QAFch-3RWlo_SR00bcdFg_nZo9JKACYlF_jHMEsf__PaYms9r7vEaSg0jPfkqnL2WXZktzQRyLBr0n-bxeUrbwIWsKOAC0DfFB5nM8XoXljRmq8yAx8BAdmQp7MIFb4EOV9nYthhua6pjzYyaFSiDiYTjw7HtXOvoL8oepodJ3-37pUKS8vdBvnvUoqC4M1YAhkO5L36JF6KV_RfmG8GPEdNQfXotHcsR-3jKi1n8S5l7Xd-rhrGOhSGQizH3dORzo9GvBAhYeqbq1O-NLzm2EQUiMQayIUx7o4g3Kw"

// The following program was used to generate the example token. Since we don't want to
// import Kubernetes, just leave it as a comment.

/*
package main

import (
	"crypto/rand"
	"crypto/rsa"
	"fmt"
	"log"

	"k8s.io/kubernetes/pkg/api"
	"k8s.io/kubernetes/pkg/serviceaccount"
	"k8s.io/kubernetes/pkg/util/uuid"
)

func main() {
	key, err := rsa.GenerateKey(rand.Reader, 2048)
	if err != nil {
		log.Fatal(err)
	}
	sa := api.ServiceAccount{
		ObjectMeta: api.ObjectMeta{
			Namespace: "dex-test-namespace",
			Name:      "dotherobot",
			UID:       uuid.NewUUID(),
		},
	}
	secret := api.Secret{
		ObjectMeta: api.ObjectMeta{
			Namespace: "dex-test-namespace",
			Name:      "dotherobot-secret",
			UID:       uuid.NewUUID(),
		},
	}
	token, err := serviceaccount.JWTTokenGenerator(key).GenerateToken(sa, secret)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(token)
}
*/