/*
Copyright 2014 The Kubernetes 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 clientcmd

import (
	"io/ioutil"
	"os"
	"reflect"
	"strings"
	"testing"

	"github.com/imdario/mergo"
	restclient "k8s.io/client-go/rest"
	clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
)

func TestOldMergoLib(t *testing.T) {
	type T struct {
		X string
	}
	dst := T{X: "one"}
	src := T{X: "two"}
	mergo.Merge(&dst, &src)
	if dst.X != "two" {
		// mergo.Merge changed in an incompatible way with
		//
		//   https://github.com/imdario/mergo/commit/d304790b2ed594794496464fadd89d2bb266600a
		//
		// We have to stay with the old version which still does eager
		// copying from src to dst in structs.
		t.Errorf("mergo.Merge library found with incompatible, new behavior")
	}
}

func createValidTestConfig() *clientcmdapi.Config {
	const (
		server = "https://anything.com:8080"
		token  = "the-token"
	)

	config := clientcmdapi.NewConfig()
	config.Clusters["clean"] = &clientcmdapi.Cluster{
		Server: server,
	}
	config.AuthInfos["clean"] = &clientcmdapi.AuthInfo{
		Token: token,
	}
	config.Contexts["clean"] = &clientcmdapi.Context{
		Cluster:  "clean",
		AuthInfo: "clean",
	}
	config.CurrentContext = "clean"

	return config
}

func createCAValidTestConfig() *clientcmdapi.Config {

	config := createValidTestConfig()
	config.Clusters["clean"].CertificateAuthorityData = []byte{0, 0}
	return config
}

func TestInsecureOverridesCA(t *testing.T) {
	config := createCAValidTestConfig()
	clientBuilder := NewNonInteractiveClientConfig(*config, "clean", &ConfigOverrides{
		ClusterInfo: clientcmdapi.Cluster{
			InsecureSkipTLSVerify: true,
		},
	}, nil)

	actualCfg, err := clientBuilder.ClientConfig()
	if err != nil {
		t.Errorf("Unexpected error: %v", err)
	}

	matchBoolArg(true, actualCfg.Insecure, t)
	matchStringArg("", actualCfg.TLSClientConfig.CAFile, t)
	matchByteArg(nil, actualCfg.TLSClientConfig.CAData, t)
}

func TestMergeContext(t *testing.T) {
	const namespace = "overriden-namespace"

	config := createValidTestConfig()
	clientBuilder := NewNonInteractiveClientConfig(*config, "clean", &ConfigOverrides{}, nil)

	_, overridden, err := clientBuilder.Namespace()
	if err != nil {
		t.Errorf("Unexpected error: %v", err)
	}

	if overridden {
		t.Error("Expected namespace to not be overridden")
	}

	clientBuilder = NewNonInteractiveClientConfig(*config, "clean", &ConfigOverrides{
		Context: clientcmdapi.Context{
			Namespace: namespace,
		},
	}, nil)

	actual, overridden, err := clientBuilder.Namespace()
	if err != nil {
		t.Errorf("Unexpected error: %v", err)
	}

	if !overridden {
		t.Error("Expected namespace to be overridden")
	}

	matchStringArg(namespace, actual, t)
}

func TestCertificateData(t *testing.T) {
	caData := []byte("ca-data")
	certData := []byte("cert-data")
	keyData := []byte("key-data")

	config := clientcmdapi.NewConfig()
	config.Clusters["clean"] = &clientcmdapi.Cluster{
		Server: "https://localhost:8443",
		CertificateAuthorityData: caData,
	}
	config.AuthInfos["clean"] = &clientcmdapi.AuthInfo{
		ClientCertificateData: certData,
		ClientKeyData:         keyData,
	}
	config.Contexts["clean"] = &clientcmdapi.Context{
		Cluster:  "clean",
		AuthInfo: "clean",
	}
	config.CurrentContext = "clean"

	clientBuilder := NewNonInteractiveClientConfig(*config, "clean", &ConfigOverrides{}, nil)

	clientConfig, err := clientBuilder.ClientConfig()
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	// Make sure cert data gets into config (will override file paths)
	matchByteArg(caData, clientConfig.TLSClientConfig.CAData, t)
	matchByteArg(certData, clientConfig.TLSClientConfig.CertData, t)
	matchByteArg(keyData, clientConfig.TLSClientConfig.KeyData, t)
}

func TestBasicAuthData(t *testing.T) {
	username := "myuser"
	password := "mypass"

	config := clientcmdapi.NewConfig()
	config.Clusters["clean"] = &clientcmdapi.Cluster{
		Server: "https://localhost:8443",
	}
	config.AuthInfos["clean"] = &clientcmdapi.AuthInfo{
		Username: username,
		Password: password,
	}
	config.Contexts["clean"] = &clientcmdapi.Context{
		Cluster:  "clean",
		AuthInfo: "clean",
	}
	config.CurrentContext = "clean"

	clientBuilder := NewNonInteractiveClientConfig(*config, "clean", &ConfigOverrides{}, nil)

	clientConfig, err := clientBuilder.ClientConfig()
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	// Make sure basic auth data gets into config
	matchStringArg(username, clientConfig.Username, t)
	matchStringArg(password, clientConfig.Password, t)
}

func TestBasicTokenFile(t *testing.T) {
	token := "exampletoken"
	f, err := ioutil.TempFile("", "tokenfile")
	if err != nil {
		t.Errorf("Unexpected error: %v", err)
		return
	}
	defer os.Remove(f.Name())
	if err := ioutil.WriteFile(f.Name(), []byte(token), 0644); err != nil {
		t.Errorf("Unexpected error: %v", err)
		return
	}

	config := clientcmdapi.NewConfig()
	config.Clusters["clean"] = &clientcmdapi.Cluster{
		Server: "https://localhost:8443",
	}
	config.AuthInfos["clean"] = &clientcmdapi.AuthInfo{
		TokenFile: f.Name(),
	}
	config.Contexts["clean"] = &clientcmdapi.Context{
		Cluster:  "clean",
		AuthInfo: "clean",
	}
	config.CurrentContext = "clean"

	clientBuilder := NewNonInteractiveClientConfig(*config, "clean", &ConfigOverrides{}, nil)

	clientConfig, err := clientBuilder.ClientConfig()
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	matchStringArg(token, clientConfig.BearerToken, t)
}

func TestPrecedenceTokenFile(t *testing.T) {
	token := "exampletoken"
	f, err := ioutil.TempFile("", "tokenfile")
	if err != nil {
		t.Errorf("Unexpected error: %v", err)
		return
	}
	defer os.Remove(f.Name())
	if err := ioutil.WriteFile(f.Name(), []byte(token), 0644); err != nil {
		t.Errorf("Unexpected error: %v", err)
		return
	}

	config := clientcmdapi.NewConfig()
	config.Clusters["clean"] = &clientcmdapi.Cluster{
		Server: "https://localhost:8443",
	}
	expectedToken := "expected"
	config.AuthInfos["clean"] = &clientcmdapi.AuthInfo{
		Token:     expectedToken,
		TokenFile: f.Name(),
	}
	config.Contexts["clean"] = &clientcmdapi.Context{
		Cluster:  "clean",
		AuthInfo: "clean",
	}
	config.CurrentContext = "clean"

	clientBuilder := NewNonInteractiveClientConfig(*config, "clean", &ConfigOverrides{}, nil)

	clientConfig, err := clientBuilder.ClientConfig()
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	matchStringArg(expectedToken, clientConfig.BearerToken, t)
}

func TestCreateClean(t *testing.T) {
	config := createValidTestConfig()
	clientBuilder := NewNonInteractiveClientConfig(*config, "clean", &ConfigOverrides{}, nil)

	clientConfig, err := clientBuilder.ClientConfig()
	if err != nil {
		t.Errorf("Unexpected error: %v", err)
	}

	matchStringArg(config.Clusters["clean"].Server, clientConfig.Host, t)
	matchStringArg("", clientConfig.APIPath, t)
	matchBoolArg(config.Clusters["clean"].InsecureSkipTLSVerify, clientConfig.Insecure, t)
	matchStringArg(config.AuthInfos["clean"].Token, clientConfig.BearerToken, t)
}

func TestCreateCleanWithPrefix(t *testing.T) {
	tt := []struct {
		server string
		host   string
	}{
		{"https://anything.com:8080/foo/bar", "https://anything.com:8080/foo/bar"},
		{"http://anything.com:8080/foo/bar", "http://anything.com:8080/foo/bar"},
		{"http://anything.com:8080/foo/bar/", "http://anything.com:8080/foo/bar/"},
		{"http://anything.com:8080/", "http://anything.com:8080/"},
		{"http://anything.com:8080//", "http://anything.com:8080//"},
		{"anything.com:8080/foo/bar", "anything.com:8080/foo/bar"},
		{"anything.com:8080", "anything.com:8080"},
		{"anything.com", "anything.com"},
		{"anything", "anything"},
	}

	tt = append(tt, struct{ server, host string }{"", "http://localhost:8080"})

	for _, tc := range tt {
		config := createValidTestConfig()

		cleanConfig := config.Clusters["clean"]
		cleanConfig.Server = tc.server
		config.Clusters["clean"] = cleanConfig

		clientBuilder := NewNonInteractiveClientConfig(*config, "clean", &ConfigOverrides{
			ClusterDefaults: clientcmdapi.Cluster{Server: "http://localhost:8080"},
		}, nil)

		clientConfig, err := clientBuilder.ClientConfig()
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}

		matchStringArg(tc.host, clientConfig.Host, t)
	}
}

func TestCreateCleanDefault(t *testing.T) {
	config := createValidTestConfig()
	clientBuilder := NewDefaultClientConfig(*config, &ConfigOverrides{})

	clientConfig, err := clientBuilder.ClientConfig()
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	matchStringArg(config.Clusters["clean"].Server, clientConfig.Host, t)
	matchBoolArg(config.Clusters["clean"].InsecureSkipTLSVerify, clientConfig.Insecure, t)
	matchStringArg(config.AuthInfos["clean"].Token, clientConfig.BearerToken, t)
}

func TestCreateCleanDefaultCluster(t *testing.T) {
	config := createValidTestConfig()
	clientBuilder := NewDefaultClientConfig(*config, &ConfigOverrides{
		ClusterDefaults: clientcmdapi.Cluster{Server: "http://localhost:8080"},
	})

	clientConfig, err := clientBuilder.ClientConfig()
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	matchStringArg(config.Clusters["clean"].Server, clientConfig.Host, t)
	matchBoolArg(config.Clusters["clean"].InsecureSkipTLSVerify, clientConfig.Insecure, t)
	matchStringArg(config.AuthInfos["clean"].Token, clientConfig.BearerToken, t)
}

func TestCreateMissingContextNoDefault(t *testing.T) {
	const expectedErrorContains = "Context was not found for specified context"
	config := createValidTestConfig()
	clientBuilder := NewNonInteractiveClientConfig(*config, "not-present", &ConfigOverrides{}, nil)

	_, err := clientBuilder.ClientConfig()
	if err == nil {
		t.Fatalf("Unexpected error: %v", err)
	}
}

func TestCreateMissingContext(t *testing.T) {
	const expectedErrorContains = "context was not found for specified context: not-present"
	config := createValidTestConfig()
	clientBuilder := NewNonInteractiveClientConfig(*config, "not-present", &ConfigOverrides{
		ClusterDefaults: clientcmdapi.Cluster{Server: "http://localhost:8080"},
	}, nil)

	_, err := clientBuilder.ClientConfig()
	if err == nil {
		t.Fatalf("Expected error: %v", expectedErrorContains)
	}
	if !strings.Contains(err.Error(), expectedErrorContains) {
		t.Fatalf("Expected error: %v, but got %v", expectedErrorContains, err)
	}
}

func TestInClusterClientConfigPrecedence(t *testing.T) {
	tt := []struct {
		overrides *ConfigOverrides
	}{
		{
			overrides: &ConfigOverrides{
				ClusterInfo: clientcmdapi.Cluster{
					Server: "https://host-from-overrides.com",
				},
			},
		},
		{
			overrides: &ConfigOverrides{
				AuthInfo: clientcmdapi.AuthInfo{
					Token: "https://host-from-overrides.com",
				},
			},
		},
		{
			overrides: &ConfigOverrides{
				ClusterInfo: clientcmdapi.Cluster{
					CertificateAuthority: "/path/to/ca-from-overrides.crt",
				},
			},
		},
		{
			overrides: &ConfigOverrides{
				ClusterInfo: clientcmdapi.Cluster{
					Server: "https://host-from-overrides.com",
				},
				AuthInfo: clientcmdapi.AuthInfo{
					Token: "https://host-from-overrides.com",
				},
			},
		},
		{
			overrides: &ConfigOverrides{
				ClusterInfo: clientcmdapi.Cluster{
					Server:               "https://host-from-overrides.com",
					CertificateAuthority: "/path/to/ca-from-overrides.crt",
				},
			},
		},
		{
			overrides: &ConfigOverrides{
				ClusterInfo: clientcmdapi.Cluster{
					CertificateAuthority: "/path/to/ca-from-overrides.crt",
				},
				AuthInfo: clientcmdapi.AuthInfo{
					Token: "https://host-from-overrides.com",
				},
			},
		},
		{
			overrides: &ConfigOverrides{
				ClusterInfo: clientcmdapi.Cluster{
					Server:               "https://host-from-overrides.com",
					CertificateAuthority: "/path/to/ca-from-overrides.crt",
				},
				AuthInfo: clientcmdapi.AuthInfo{
					Token: "https://host-from-overrides.com",
				},
			},
		},
		{
			overrides: &ConfigOverrides{},
		},
	}

	for _, tc := range tt {
		expectedServer := "https://host-from-cluster.com"
		expectedToken := "token-from-cluster"
		expectedCAFile := "/path/to/ca-from-cluster.crt"

		icc := &inClusterClientConfig{
			inClusterConfigProvider: func() (*restclient.Config, error) {
				return &restclient.Config{
					Host:        expectedServer,
					BearerToken: expectedToken,
					TLSClientConfig: restclient.TLSClientConfig{
						CAFile: expectedCAFile,
					},
				}, nil
			},
			overrides: tc.overrides,
		}

		clientConfig, err := icc.ClientConfig()
		if err != nil {
			t.Fatalf("Unxpected error: %v", err)
		}

		if overridenServer := tc.overrides.ClusterInfo.Server; len(overridenServer) > 0 {
			expectedServer = overridenServer
		}
		if overridenToken := tc.overrides.AuthInfo.Token; len(overridenToken) > 0 {
			expectedToken = overridenToken
		}
		if overridenCAFile := tc.overrides.ClusterInfo.CertificateAuthority; len(overridenCAFile) > 0 {
			expectedCAFile = overridenCAFile
		}

		if clientConfig.Host != expectedServer {
			t.Errorf("Expected server %v, got %v", expectedServer, clientConfig.Host)
		}
		if clientConfig.BearerToken != expectedToken {
			t.Errorf("Expected token %v, got %v", expectedToken, clientConfig.BearerToken)
		}
		if clientConfig.TLSClientConfig.CAFile != expectedCAFile {
			t.Errorf("Expected Certificate Authority %v, got %v", expectedCAFile, clientConfig.TLSClientConfig.CAFile)
		}
	}
}

func matchBoolArg(expected, got bool, t *testing.T) {
	if expected != got {
		t.Errorf("Expected %v, got %v", expected, got)
	}
}

func matchStringArg(expected, got string, t *testing.T) {
	if expected != got {
		t.Errorf("Expected %q, got %q", expected, got)
	}
}

func matchByteArg(expected, got []byte, t *testing.T) {
	if !reflect.DeepEqual(expected, got) {
		t.Errorf("Expected %v, got %v", expected, got)
	}
}