/*
Copyright 2017 Google LLC

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

    https://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 controller

import (
	"os"
	"testing"

	"github.com/stretchr/testify/assert"

	apiv1 "k8s.io/api/core/v1"
	apiextensionsfake "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset/fake"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	kubeclientfake "k8s.io/client-go/kubernetes/fake"
	"k8s.io/client-go/tools/record"

	"k8s.io/spark-on-k8s-operator/pkg/apis/sparkoperator.k8s.io/v1alpha1"
	crdfake "k8s.io/spark-on-k8s-operator/pkg/client/clientset/versioned/fake"
)

func newFakeController() *SparkApplicationController {
	crdClient := crdfake.NewSimpleClientset()
	kubeClient := kubeclientfake.NewSimpleClientset()
	kubeClient.CoreV1().Nodes().Create(&apiv1.Node{
		ObjectMeta: metav1.ObjectMeta{
			Name: "node1",
		},
		Status: apiv1.NodeStatus{
			Addresses: []apiv1.NodeAddress{
				{
					Type:    apiv1.NodeExternalIP,
					Address: "12.34.56.78",
				},
			},
		},
	})
	return newSparkApplicationController(crdClient, kubeClient, apiextensionsfake.NewSimpleClientset(),
		record.NewFakeRecorder(3), 0)
}

func TestSubmitApp(t *testing.T) {
	ctrl := newFakeController()

	os.Setenv(kubernetesServiceHostEnvVar, "localhost")
	os.Setenv(kubernetesServicePortEnvVar, "443")

	app := &v1alpha1.SparkApplication{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "foo",
			Namespace: "default",
		},
	}
	ctrl.crdClient.SparkoperatorV1alpha1().SparkApplications(app.Namespace).Create(app)

	go ctrl.submitApp(app, false)
	submission := <-ctrl.runner.queue
	assert.Equal(t, submission.appName, app.Name, "wanted application name %s got %s", app.Name, submission.appName)
}

func TestOnDelete(t *testing.T) {
	ctrl := newFakeController()

	os.Setenv(kubernetesServiceHostEnvVar, "localhost")
	os.Setenv(kubernetesServicePortEnvVar, "443")

	app := &v1alpha1.SparkApplication{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "foo",
			Namespace: "default",
		},
		Status: v1alpha1.SparkApplicationStatus{
			AppID: "foo-123",
		},
	}
	ctrl.crdClient.SparkoperatorV1alpha1().SparkApplications(app.Namespace).Create(app)

	driverPod := &apiv1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "foo-driver",
			Namespace: app.Namespace,
		},
	}
	ctrl.kubeClient.CoreV1().Pods(app.Namespace).Create(driverPod)

	_, err := ctrl.kubeClient.CoreV1().Pods(app.Namespace).Get(driverPod.Name, metav1.GetOptions{})
	assert.True(t, err == nil)

	createSparkUIService(app, ctrl.kubeClient)
	app.Annotations = make(map[string]string)
	app.Status.DriverInfo.PodName = driverPod.Name

	ctrl.onDelete(app)

	_, ok := ctrl.runningApps[app.Status.AppID]
	assert.False(t, ok)
}

func TestProcessSingleDriverStateUpdate(t *testing.T) {
	type testcase struct {
		name             string
		update           driverStateUpdate
		expectedAppState v1alpha1.ApplicationStateType
	}

	ctrl := newFakeController()

	appID := "foo-123"
	app := &v1alpha1.SparkApplication{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "foo",
			Namespace: "default",
		},
		Status: v1alpha1.SparkApplicationStatus{
			AppID: appID,
			AppState: v1alpha1.ApplicationState{
				State:        v1alpha1.NewState,
				ErrorMessage: "",
			},
		},
	}
	ctrl.crdClient.SparkoperatorV1alpha1().SparkApplications(app.Namespace).Create(app)
	ctrl.runningApps[app.Status.AppID] = app

	testcases := []testcase{
		{
			name: "succeeded driver",
			update: driverStateUpdate{
				appID:    appID,
				podName:  "foo-driver",
				nodeName: "node1",
				podPhase: apiv1.PodSucceeded,
			},
			expectedAppState: v1alpha1.CompletedState,
		},
		{
			name: "failed driver",
			update: driverStateUpdate{
				appID:    appID,
				podName:  "foo-driver",
				nodeName: "node1",
				podPhase: apiv1.PodFailed,
			},
			expectedAppState: v1alpha1.FailedState,
		},
		{
			name: "running driver",
			update: driverStateUpdate{
				appID:    appID,
				podName:  "foo-driver",
				nodeName: "node1",
				podPhase: apiv1.PodRunning,
			},
			expectedAppState: v1alpha1.RunningState,
		},
	}

	testFn := func(test testcase, t *testing.T) {
		ctrl.runningApps[test.update.appID].Status.AppState.State = v1alpha1.NewState
		ctrl.processSingleDriverStateUpdate(test.update)
		app, ok := ctrl.runningApps[test.update.appID]
		if !ok {
			t.Errorf("%s: SparkApplication %s not found", test.name, test.update.appID)
		}
		assert.Equal(
			t,
			app.Status.AppState.State,
			test.expectedAppState,
			"wanted application state %s got %s",
			test.expectedAppState,
			app.Status.AppState.State)
	}

	for _, test := range testcases {
		testFn(test, t)
	}
}

func TestProcessSingleAppStateUpdate(t *testing.T) {
	type testcase struct {
		name             string
		update           appStateUpdate
		initialAppState  v1alpha1.ApplicationStateType
		expectedAppState v1alpha1.ApplicationStateType
	}

	ctrl := newFakeController()

	appID := "foo-123"
	app := &v1alpha1.SparkApplication{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "foo",
			Namespace: "default",
		},
		Status: v1alpha1.SparkApplicationStatus{
			AppID: appID,
			AppState: v1alpha1.ApplicationState{
				State:        v1alpha1.NewState,
				ErrorMessage: "",
			},
		},
	}
	ctrl.crdClient.SparkoperatorV1alpha1().SparkApplications(app.Namespace).Create(app)
	ctrl.runningApps[app.Status.AppID] = app

	testcases := []testcase{
		{
			name: "succeeded app",
			update: appStateUpdate{
				appID:        appID,
				state:        v1alpha1.CompletedState,
				errorMessage: "",
			},
			initialAppState:  v1alpha1.RunningState,
			expectedAppState: v1alpha1.CompletedState,
		},
		{
			name: "failed app",
			update: appStateUpdate{
				appID:        appID,
				state:        v1alpha1.FailedState,
				errorMessage: "",
			},
			initialAppState:  v1alpha1.RunningState,
			expectedAppState: v1alpha1.FailedState,
		},
		{
			name: "running app",
			update: appStateUpdate{
				appID:        appID,
				state:        v1alpha1.RunningState,
				errorMessage: "",
			},
			initialAppState:  v1alpha1.NewState,
			expectedAppState: v1alpha1.RunningState,
		},
		{
			name: "completed app with initial state SubmittedState",
			update: appStateUpdate{
				appID:        appID,
				state:        v1alpha1.FailedSubmissionState,
				errorMessage: "",
			},
			initialAppState:  v1alpha1.RunningState,
			expectedAppState: v1alpha1.FailedSubmissionState,
		},
	}

	testFn := func(test testcase, t *testing.T) {
		ctrl.runningApps[test.update.appID].Status.AppState.State = test.initialAppState
		ctrl.processSingleAppStateUpdate(test.update)
		app, ok := ctrl.runningApps[test.update.appID]
		if !ok {
			t.Errorf("%s: SparkApplication %s not found", test.name, test.update.appID)
		}
		assert.Equal(
			t,
			app.Status.AppState.State,
			test.expectedAppState,
			"wanted application state %s got %s",
			test.expectedAppState,
			app.Status.AppState.State)
	}

	for _, test := range testcases {
		testFn(test, t)
	}
}

func TestProcessSingleExecutorStateUpdate(t *testing.T) {
	type testcase struct {
		name                   string
		update                 executorStateUpdate
		expectedExecutorStates map[string]v1alpha1.ExecutorState
	}

	ctrl := newFakeController()

	appID := "foo-123"
	app := &v1alpha1.SparkApplication{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "foo",
			Namespace: "default",
		},
		Status: v1alpha1.SparkApplicationStatus{
			AppID: appID,
			AppState: v1alpha1.ApplicationState{
				State:        v1alpha1.NewState,
				ErrorMessage: "",
			},
			ExecutorState: make(map[string]v1alpha1.ExecutorState),
		},
	}
	ctrl.crdClient.SparkoperatorV1alpha1().SparkApplications(app.Namespace).Create(app)
	ctrl.runningApps[app.Status.AppID] = app

	testcases := []testcase{
		{
			name: "completed executor",
			update: executorStateUpdate{
				appID:      appID,
				podName:    "foo-exec-1",
				executorID: "1",
				state:      v1alpha1.ExecutorCompletedState,
			},
			expectedExecutorStates: map[string]v1alpha1.ExecutorState{
				"foo-exec-1": v1alpha1.ExecutorCompletedState,
			},
		},
		{
			name: "failed executor",
			update: executorStateUpdate{
				appID:      appID,
				podName:    "foo-exec-2",
				executorID: "2",
				state:      v1alpha1.ExecutorFailedState,
			},
			expectedExecutorStates: map[string]v1alpha1.ExecutorState{
				"foo-exec-1": v1alpha1.ExecutorCompletedState,
				"foo-exec-2": v1alpha1.ExecutorFailedState,
			},
		},
		{
			name: "running executor",
			update: executorStateUpdate{
				appID:      appID,
				podName:    "foo-exec-3",
				executorID: "3",
				state:      v1alpha1.ExecutorRunningState,
			},
			expectedExecutorStates: map[string]v1alpha1.ExecutorState{
				"foo-exec-1": v1alpha1.ExecutorCompletedState,
				"foo-exec-2": v1alpha1.ExecutorFailedState,
				"foo-exec-3": v1alpha1.ExecutorRunningState,
			},
		},
		{
			name: "pending executor",
			update: executorStateUpdate{
				appID:      appID,
				podName:    "foo-exec-4",
				executorID: "4",
				state:      v1alpha1.ExecutorPendingState,
			},
			expectedExecutorStates: map[string]v1alpha1.ExecutorState{
				"foo-exec-1": v1alpha1.ExecutorCompletedState,
				"foo-exec-2": v1alpha1.ExecutorFailedState,
				"foo-exec-3": v1alpha1.ExecutorRunningState,
			},
		},
	}

	testFn := func(test testcase, t *testing.T) {
		ctrl.processSingleExecutorStateUpdate(test.update)
		app, ok := ctrl.runningApps[test.update.appID]
		if !ok {
			t.Errorf("%s: SparkApplication %s not found", test.name, test.update.appID)
		}
		assert.Equal(
			t,
			app.Status.ExecutorState,
			test.expectedExecutorStates,
			"wanted executor states %s got %s",
			test.expectedExecutorStates,
			app.Status.ExecutorState)
	}

	for _, test := range testcases {
		testFn(test, t)
	}
}