/*
Copyright 2024 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 config

import (
	"fmt"
	"os"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime/schema"
)

const testConfig = `
apiVersion: config.karmada.io/v1alpha1
kind: KarmadaInitConfig
spec:
 certificates:
   caCertFile: "/etc/karmada/pki/ca.crt"
   caKeyFile: "/etc/karmada/pki/ca.key"
   externalDNS:
     - "localhost"
     - "example.com"
   externalIP:
     - "192.168.1.2"
     - "172.16.1.2"
   validityPeriod: "8760h0m0s"
 etcd:
   local:
     Repository: "registry.k8s.io/etcd"
     Tag: "latest"
     dataPath: "/var/lib/karmada-etcd"
     initImage:
       repository: "alpine"
       tag: "3.19.1"
     nodeSelectorLabels:
       karmada.io/etcd: "true"
     pvcSize: "5Gi"
     replicas: 3
     storageClassesName: "fast"
     storageMode: "PVC"
   external:
     endpoints:
       - "https://example.com:8443"
     caFile: "/path/to/your/ca.crt"
     certFile: "/path/to/your/cert.crt"
     keyFile: "/path/to/your/key.key"
     keyPrefix: "ext-"
 hostCluster:
   apiEndpoint: "https://kubernetes.example.com"
   kubeconfig: "/root/.kube/config"
   context: "karmada-host"
   domain: "cluster.local"
 images:
   imagePullPolicy: "IfNotPresent"
   imagePullSecrets:
     - "PullSecret1"
     - "PullSecret2"
   kubeImageMirrorCountry: "cn"
   kubeImageRegistry: "registry.cn-hangzhou.aliyuncs.com/google_containers"
   kubeImageTag: "v1.29.6"
   privateRegistry:
     registry: "my.private.registry"
 components:
   karmadaAPIServer:
     repository: "karmada/kube-apiserver"
     tag: "v1.29.6"
     replicas: 1
     advertiseAddress: "192.168.1.100"
     serviceType: "NodePort"
     networking:
       namespace: "karmada-system"
       port: 32443
   karmadaAggregatedAPIServer:
     repository: "karmada/karmada-aggregated-apiserver"
     tag: "v0.0.0-master"
     replicas: 1
   kubeControllerManager:
     repository: "karmada/kube-controller-manager"
     tag: "v1.29.6"
     replicas: 1
   karmadaControllerManager:
     repository: "karmada/karmada-controller-manager"
     tag: "v0.0.0-master"
     replicas: 1
   karmadaScheduler:
     repository: "karmada/karmada-scheduler"
     tag: "v0.0.0-master"
     replicas: 1
   karmadaWebhook:
     repository: "karmada/karmada-webhook"
     tag: "v0.0.0-master"
     replicas: 1
 karmadaDataPath: "/etc/karmada"
 karmadaPKIPath: "/etc/karmada/pki"
 karmadaCRDs: "https://github.com/karmada-io/karmada/releases/download/test/crds.tar.gz"
 waitComponentReadyTimeout: 120
`

const invalidTestConfig = `
apiVersion: v1alpha1
kind: KarmadaInitConfig
metadata:
  name: karmada-init
spec:
  waitComponentReadyTimeout: "invalid-int"
`

func TestLoadInitConfiguration(t *testing.T) {
	expectedConfig := &KarmadaInitConfig{
		TypeMeta: metav1.TypeMeta{
			Kind:       "KarmadaInitConfig",
			APIVersion: "config.karmada.io/v1alpha1",
		},
		Spec: KarmadaInitSpec{
			WaitComponentReadyTimeout: 120,
			KarmadaDataPath:           "/etc/karmada",
			KarmadaPKIPath:            "/etc/karmada/pki",
			KarmadaCRDs:               "https://github.com/karmada-io/karmada/releases/download/test/crds.tar.gz",
			Certificates: Certificates{
				CACertFile: "/etc/karmada/pki/ca.crt",
				CAKeyFile:  "/etc/karmada/pki/ca.key",
				ExternalDNS: []string{
					"localhost",
					"example.com",
				},
				ExternalIP: []string{
					"192.168.1.2",
					"172.16.1.2",
				},
				ValidityPeriod: metav1.Duration{Duration: parseDuration("8760h")},
			},
			Etcd: Etcd{
				Local: &LocalEtcd{
					CommonSettings: CommonSettings{
						Image: Image{
							Repository: "registry.k8s.io/etcd",
							Tag:        "latest",
						},
						Replicas: 3,
					},
					InitImage: Image{
						Repository: "alpine",
						Tag:        "3.19.1",
					},
					DataPath: "/var/lib/karmada-etcd",
					PVCSize:  "5Gi",
					NodeSelectorLabels: map[string]string{
						"karmada.io/etcd": "true",
					},
					StorageClassesName: "fast",
					StorageMode:        "PVC",
				},
				External: &ExternalEtcd{
					Endpoints: []string{
						"https://example.com:8443",
					},
					CAFile:    "/path/to/your/ca.crt",
					CertFile:  "/path/to/your/cert.crt",
					KeyFile:   "/path/to/your/key.key",
					KeyPrefix: "ext-",
				},
			},
			HostCluster: HostCluster{
				APIEndpoint: "https://kubernetes.example.com",
				Kubeconfig:  "/root/.kube/config",
				Context:     "karmada-host",
				Domain:      "cluster.local",
			},
			Images: Images{
				ImagePullPolicy:        corev1.PullIfNotPresent,
				ImagePullSecrets:       []string{"PullSecret1", "PullSecret2"},
				KubeImageMirrorCountry: "cn",
				KubeImageRegistry:      "registry.cn-hangzhou.aliyuncs.com/google_containers",
				KubeImageTag:           "v1.29.6",
				PrivateRegistry: &ImageRegistry{
					Registry: "my.private.registry",
				},
			},
			Components: KarmadaComponents{
				KarmadaAPIServer: &KarmadaAPIServer{
					CommonSettings: CommonSettings{
						Image: Image{
							Repository: "karmada/kube-apiserver",
							Tag:        "v1.29.6",
						},
						Replicas: 1,
					},
					AdvertiseAddress: "192.168.1.100",
					Networking: Networking{
						Namespace: "karmada-system",
						Port:      32443,
					},
				},
				KarmadaAggregatedAPIServer: &KarmadaAggregatedAPIServer{
					CommonSettings: CommonSettings{
						Image: Image{
							Repository: "karmada/karmada-aggregated-apiserver",
							Tag:        "v0.0.0-master",
						},
						Replicas: 1,
					},
				},
				KubeControllerManager: &KubeControllerManager{
					CommonSettings: CommonSettings{
						Image: Image{
							Repository: "karmada/kube-controller-manager",
							Tag:        "v1.29.6",
						},
						Replicas: 1,
					},
				},
				KarmadaControllerManager: &KarmadaControllerManager{
					CommonSettings: CommonSettings{
						Image: Image{
							Repository: "karmada/karmada-controller-manager",
							Tag:        "v0.0.0-master",
						},
						Replicas: 1,
					},
				},
				KarmadaScheduler: &KarmadaScheduler{
					CommonSettings: CommonSettings{
						Image: Image{
							Repository: "karmada/karmada-scheduler",
							Tag:        "v0.0.0-master",
						},
						Replicas: 1,
					},
				},
				KarmadaWebhook: &KarmadaWebhook{
					CommonSettings: CommonSettings{
						Image: Image{
							Repository: "karmada/karmada-webhook",
							Tag:        "v0.0.0-master",
						},
						Replicas: 1,
					},
				},
			},
		},
	}

	t.Run("Test Load Valid Configuration", func(t *testing.T) {
		tmpFile, err := os.CreateTemp("", "test-config-*.yaml")
		assert.NoError(t, err)
		defer os.Remove(tmpFile.Name())

		_, err = tmpFile.Write([]byte(testConfig))
		assert.NoError(t, err)
		err = tmpFile.Close()
		assert.NoError(t, err)

		config, err := LoadInitConfiguration(tmpFile.Name())
		assert.NoError(t, err)
		assert.Equal(t, expectedConfig, config)
	})

	t.Run("Test Load Invalid Configuration", func(t *testing.T) {
		tmpFile, err := os.CreateTemp("", "invalid-config-*.yaml")
		assert.NoError(t, err)
		defer os.Remove(tmpFile.Name())

		_, err = tmpFile.Write([]byte(invalidTestConfig))
		assert.NoError(t, err)
		err = tmpFile.Close()
		assert.NoError(t, err)

		_, err = LoadInitConfiguration(tmpFile.Name())
		assert.Error(t, err)
	})

	t.Run("Test Load Non-Existent Configuration", func(t *testing.T) {
		_, err := LoadInitConfiguration("non-existent-file.yaml")
		assert.Error(t, err)
	})
}

func TestParseGVKYamlMap(t *testing.T) {
	t.Run("Test Parse Valid GVK Yaml", func(t *testing.T) {
		gvkmap, err := ParseGVKYamlMap([]byte(testConfig))
		assert.NoError(t, err)
		assert.NotEmpty(t, gvkmap)

		// Check if the GVK is correct
		for gvk := range gvkmap {
			assert.Equal(t, "config.karmada.io", gvk.Group)
			assert.Equal(t, "v1alpha1", gvk.Version)
			assert.Equal(t, "KarmadaInitConfig", gvk.Kind)
		}
	})

	t.Run("Test Parse Invalid GVK Yaml - Incorrect Group/Version/Kind", func(t *testing.T) {
		invalidGVKConfig := `
apiVersion: invalid.group/v1beta1
kind: InvalidKind
metadata:
  name: invalid-config
spec:
  key: value
`
		gvkmap, err := ParseGVKYamlMap([]byte(invalidGVKConfig))
		assert.NoError(t, err, "Expected error due to invalid Group/Version/Kind")

		for gvk := range gvkmap {
			assert.Equal(t, "invalid.group", gvk.Group)
			assert.Equal(t, "v1beta1", gvk.Version)
			assert.Equal(t, "InvalidKind", gvk.Kind)
		}
	})

	t.Run("Test Parse Invalid Yaml - Bad Formatting", func(t *testing.T) {
		// This YAML has invalid formatting (bad indentation)
		invalidFormattedYAML := `
apiVersion: config.karmada.io/v1alpha1
kind: KarmadaInitConfig
metadata:
 name: invalid-format
spec:
 certificates:
   caCertFile: /etc/karmada/pki/ca.crt
   caKeyFile: /etc/karmada/pki/ca.key
 externalDNS
   - "localhost"
`
		_, err := ParseGVKYamlMap([]byte(invalidFormattedYAML))
		assert.Error(t, err, "Expected error due to incorrect YAML formatting")
	})

	t.Run("Test Parse Empty Yaml", func(t *testing.T) {
		_, err := ParseGVKYamlMap([]byte{})
		assert.Error(t, err, "Expected error due to empty YAML")
	})
}

func TestDocumentMapToInitConfiguration(t *testing.T) {
	t.Run("Test Valid GVK Map to InitConfiguration", func(t *testing.T) {
		gvkmap, err := ParseGVKYamlMap([]byte(testConfig))
		assert.NoError(t, err)

		config, err := documentMapToInitConfiguration(gvkmap)
		assert.NoError(t, err)
		assert.NotNil(t, config)
		assert.Equal(t, "KarmadaInitConfig", config.Kind)
	})

	t.Run("Test Invalid GVK Map with Missing Kind", func(t *testing.T) {
		// Create a GVK map with an invalid Kind
		invalidGVK := map[schema.GroupVersionKind][]byte{
			{Group: "config.karmada.io", Version: "v1alpha1", Kind: "InvalidKind"}: []byte(testConfig),
		}

		_, err := documentMapToInitConfiguration(invalidGVK)
		assert.Error(t, err, "Expected error due to missing KarmadaInitConfig kind")
	})

	t.Run("Test Invalid GVK with Wrong Group and Version", func(t *testing.T) {
		invalidGVKConfig := `
apiVersion: wrong.group/v0alpha1
kind: KarmadaInitConfig
metadata:
  name: invalid-config
`
		gvkmap, err := ParseGVKYamlMap([]byte(invalidGVKConfig))
		assert.NoError(t, err)

		_, err = documentMapToInitConfiguration(gvkmap)
		assert.Error(t, err, "Expected error due to incorrect Group or Version")
	})

	t.Run("Test Multiple GVKs with Only One KarmadaInitConfig", func(t *testing.T) {
		multiGVKConfig := `
apiVersion: config.karmada.io/v1alpha1
kind: KarmadaInitConfig
metadata:
  name: valid-config
---
apiVersion: other.group/v1beta1
kind: OtherConfig
metadata:
  name: other-config
`
		gvkmap, err := ParseGVKYamlMap([]byte(multiGVKConfig))
		assert.NoError(t, err)

		config, err := documentMapToInitConfiguration(gvkmap)
		assert.NoError(t, err)
		assert.NotNil(t, config)
		assert.Equal(t, "KarmadaInitConfig", config.Kind)

		// Ensure the other config is ignored
		assert.Len(t, gvkmap, 1, fmt.Sprintf("Expect only 1 GVKs in the map, but got %d", len(gvkmap)))
	})
}

// parseDuration parses a duration string and returns the corresponding time.Duration value.
// If the parsing fails, it returns a duration of 0.
func parseDuration(durationStr string) time.Duration {
	duration, err := time.ParseDuration(durationStr)
	if err != nil {
		return 0
	}
	return duration
}